TY  - JOUR
AU  - Mutić, Tijana
AU  - Ognjanović, Miloš
AU  - Kodranov, Igor
AU  - Robić, Marko
AU  - Savić, Slađana
AU  - Krehula, Stjepko
AU  - Stanković, Dalibor M.
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10737
AB  - In this work, we investigated the morphological and electrochemical properties of gallium/bismuth mixed oxide. The bismuth concentration was varied from 0 to 100%. The correct ratio was determined with inductively coupled plasma-optical emission spectroscopy (ICP-OES), while surface characteristics were determined using scanning electron microscopy (SEM) and X-ray diffraction (XRD) measurement. Electrochemical characteristics were studied using electrochemical impedance spectroscopy (EIS) in the Fe2+/3+ couple. The obtained materials were tested for adrenaline detection. After square wave voltammetry (SWV) optimization, the best electrode showed a wide linear working range from 7 to 100 µM at pH 6 of the Britton–Robinson buffer solution (BRBS) supporting electrolyte. The limit of detection (LOD) for the proposed method was calculated as 1.9 µM, with a limit of quantification (LOQ) of 5.8 µM. The excellent selectivity of the proposed method, with good repeatability and reproducibility, strongly suggests the possible application of the procedure for the determination of adrenaline in artificially prepared real samples. The practical applicability with good recovery values indicates that the morphology of the materials is closely connected with other parameters, which further suggests that the developed approach can offer a low-cost, rapid, selective, and sensitive method for adrenaline monitoring. Graphical abstract: [Figure not available: see fulltext.] © 2023, Springer-Verlag GmbH Germany, part of Springer Nature.
T2  - Analytical and Bioanalytical Chemistry
T1  - The influence of bismuth participation on the morphological and electrochemical characteristics of gallium oxide for the detection of adrenaline
VL  - 415
SP  - 4445
EP  - 4458
DO  - 10.1007/s00216-023-04617-7
ER  - 

@article{
author = "Mutić, Tijana and Ognjanović, Miloš and Kodranov, Igor and Robić, Marko and Savić, Slađana and Krehula, Stjepko and Stanković, Dalibor M.",
year = "2023",
abstract = "In this work, we investigated the morphological and electrochemical properties of gallium/bismuth mixed oxide. The bismuth concentration was varied from 0 to 100%. The correct ratio was determined with inductively coupled plasma-optical emission spectroscopy (ICP-OES), while surface characteristics were determined using scanning electron microscopy (SEM) and X-ray diffraction (XRD) measurement. Electrochemical characteristics were studied using electrochemical impedance spectroscopy (EIS) in the Fe2+/3+ couple. The obtained materials were tested for adrenaline detection. After square wave voltammetry (SWV) optimization, the best electrode showed a wide linear working range from 7 to 100 µM at pH 6 of the Britton–Robinson buffer solution (BRBS) supporting electrolyte. The limit of detection (LOD) for the proposed method was calculated as 1.9 µM, with a limit of quantification (LOQ) of 5.8 µM. The excellent selectivity of the proposed method, with good repeatability and reproducibility, strongly suggests the possible application of the procedure for the determination of adrenaline in artificially prepared real samples. The practical applicability with good recovery values indicates that the morphology of the materials is closely connected with other parameters, which further suggests that the developed approach can offer a low-cost, rapid, selective, and sensitive method for adrenaline monitoring. Graphical abstract: [Figure not available: see fulltext.] © 2023, Springer-Verlag GmbH Germany, part of Springer Nature.",
journal = "Analytical and Bioanalytical Chemistry",
title = "The influence of bismuth participation on the morphological and electrochemical characteristics of gallium oxide for the detection of adrenaline",
volume = "415",
pages = "4445-4458",
doi = "10.1007/s00216-023-04617-7"
}

Mutić, T., Ognjanović, M., Kodranov, I., Robić, M., Savić, S., Krehula, S.,& Stanković, D. M.. (2023). The influence of bismuth participation on the morphological and electrochemical characteristics of gallium oxide for the detection of adrenaline. in Analytical and Bioanalytical Chemistry, 415, 4445-4458.
https://doi.org/10.1007/s00216-023-04617-7

Mutić T, Ognjanović M, Kodranov I, Robić M, Savić S, Krehula S, Stanković DM. The influence of bismuth participation on the morphological and electrochemical characteristics of gallium oxide for the detection of adrenaline. in Analytical and Bioanalytical Chemistry. 2023;415:4445-4458.
doi:10.1007/s00216-023-04617-7 .

Mutić, Tijana, Ognjanović, Miloš, Kodranov, Igor, Robić, Marko, Savić, Slađana, Krehula, Stjepko, Stanković, Dalibor M., "The influence of bismuth participation on the morphological and electrochemical characteristics of gallium oxide for the detection of adrenaline" in Analytical and Bioanalytical Chemistry, 415 (2023):4445-4458,
https://doi.org/10.1007/s00216-023-04617-7 . .

TY  - JOUR
AU  - Mutić, Tijana
AU  - Ognjanović, Miloš
AU  - Kodranov, Igor
AU  - Robić, Marko
AU  - Savić, Slađana
AU  - Krehula, Stjepko
AU  - Stanković, Dalibor M.
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10855
AB  - Author Tijana Mutić should be afliated to afliation 4.
Afliation 4 should be added: Faculty of Pharmacy University of Belgrade – Department of Analytical Chemistry, Vojvode Stepe 450, 11,221 Belgrade, Serbia
T2  - Analytical and Bioanalytical Chemistry
T1  - Correction to: The influence of bismuth participation on the morphological and electrochemical characteristics of gallium oxide for the detection of adrenaline
DO  - 10.1007/s00216-023-04674-y
ER  - 

@article{
author = "Mutić, Tijana and Ognjanović, Miloš and Kodranov, Igor and Robić, Marko and Savić, Slađana and Krehula, Stjepko and Stanković, Dalibor M.",
year = "2023",
abstract = "Author Tijana Mutić should be afliated to afliation 4.
Afliation 4 should be added: Faculty of Pharmacy University of Belgrade – Department of Analytical Chemistry, Vojvode Stepe 450, 11,221 Belgrade, Serbia",
journal = "Analytical and Bioanalytical Chemistry",
title = "Correction to: The influence of bismuth participation on the morphological and electrochemical characteristics of gallium oxide for the detection of adrenaline",
doi = "10.1007/s00216-023-04674-y"
}

Mutić, T., Ognjanović, M., Kodranov, I., Robić, M., Savić, S., Krehula, S.,& Stanković, D. M.. (2023). Correction to: The influence of bismuth participation on the morphological and electrochemical characteristics of gallium oxide for the detection of adrenaline. in Analytical and Bioanalytical Chemistry.
https://doi.org/10.1007/s00216-023-04674-y

Mutić T, Ognjanović M, Kodranov I, Robić M, Savić S, Krehula S, Stanković DM. Correction to: The influence of bismuth participation on the morphological and electrochemical characteristics of gallium oxide for the detection of adrenaline. in Analytical and Bioanalytical Chemistry. 2023;.
doi:10.1007/s00216-023-04674-y .

Mutić, Tijana, Ognjanović, Miloš, Kodranov, Igor, Robić, Marko, Savić, Slađana, Krehula, Stjepko, Stanković, Dalibor M., "Correction to: The influence of bismuth participation on the morphological and electrochemical characteristics of gallium oxide for the detection of adrenaline" in Analytical and Bioanalytical Chemistry (2023),
https://doi.org/10.1007/s00216-023-04674-y . .

TY  - JOUR
AU  - Ognjanović, Miloš
AU  - Stanković, Dalibor M.
AU  - Jaćimović, Željko K.
AU  - Kosović-Perutović, Milica
AU  - Mariano, José F. M. L.
AU  - Krehula, Stjepko
AU  - Musić, Svetozar
AU  - Antić, Bratislav
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10215
AB  - Nickel acetate tetrahydrate (NAT) sample series were used to modify screen-printed carbon electrodes (SPCE). The samples were hybrid Ni/NiO nanocomposites, where the NiO phase increased with an applied treatment temperature. Results of electrochemical measurements pointed that the Ni/NiO550/SPCE-modified electrode had the best analytical performance toward the detection of riboflavin (RF). The Ni/NiO550/SPCE-based sensor showed linear response with RF in the concentration range of 0.5–75 μM and 0.15 μM LOD in BRBS. Sensor offered fast response time, good repeatability, and selectivity with an RSD of 1.4 %. Our results show that the Ni:NiO nanocomposite ratio strongly influenced the electroanalytical performance of SPCE.
T2  - Electroanalysis
T1  - Construction of Sensor for Submicromolar Detection of Riboflavin by Surface Modification of SPCE with Thermal Degradation Products of Nickel Acetate Tetrahydrate
VL  - 34
IS  - 9
SP  - 1431
EP  - 1440
DO  - 10.1002/elan.202100602
ER  - 

@article{
author = "Ognjanović, Miloš and Stanković, Dalibor M. and Jaćimović, Željko K. and Kosović-Perutović, Milica and Mariano, José F. M. L. and Krehula, Stjepko and Musić, Svetozar and Antić, Bratislav",
year = "2022",
abstract = "Nickel acetate tetrahydrate (NAT) sample series were used to modify screen-printed carbon electrodes (SPCE). The samples were hybrid Ni/NiO nanocomposites, where the NiO phase increased with an applied treatment temperature. Results of electrochemical measurements pointed that the Ni/NiO550/SPCE-modified electrode had the best analytical performance toward the detection of riboflavin (RF). The Ni/NiO550/SPCE-based sensor showed linear response with RF in the concentration range of 0.5–75 μM and 0.15 μM LOD in BRBS. Sensor offered fast response time, good repeatability, and selectivity with an RSD of 1.4 %. Our results show that the Ni:NiO nanocomposite ratio strongly influenced the electroanalytical performance of SPCE.",
journal = "Electroanalysis",
title = "Construction of Sensor for Submicromolar Detection of Riboflavin by Surface Modification of SPCE with Thermal Degradation Products of Nickel Acetate Tetrahydrate",
volume = "34",
number = "9",
pages = "1431-1440",
doi = "10.1002/elan.202100602"
}

Ognjanović, M., Stanković, D. M., Jaćimović, Ž. K., Kosović-Perutović, M., Mariano, J. F. M. L., Krehula, S., Musić, S.,& Antić, B.. (2022). Construction of Sensor for Submicromolar Detection of Riboflavin by Surface Modification of SPCE with Thermal Degradation Products of Nickel Acetate Tetrahydrate. in Electroanalysis, 34(9), 1431-1440.
https://doi.org/10.1002/elan.202100602

Ognjanović M, Stanković DM, Jaćimović ŽK, Kosović-Perutović M, Mariano JFML, Krehula S, Musić S, Antić B. Construction of Sensor for Submicromolar Detection of Riboflavin by Surface Modification of SPCE with Thermal Degradation Products of Nickel Acetate Tetrahydrate. in Electroanalysis. 2022;34(9):1431-1440.
doi:10.1002/elan.202100602 .

Ognjanović, Miloš, Stanković, Dalibor M., Jaćimović, Željko K., Kosović-Perutović, Milica, Mariano, José F. M. L., Krehula, Stjepko, Musić, Svetozar, Antić, Bratislav, "Construction of Sensor for Submicromolar Detection of Riboflavin by Surface Modification of SPCE with Thermal Degradation Products of Nickel Acetate Tetrahydrate" in Electroanalysis, 34, no. 9 (2022):1431-1440,
https://doi.org/10.1002/elan.202100602 . .

TY  - JOUR
AU  - Ognjanović, Miloš
AU  - Nikolić, Katarina
AU  - Bošković, Marko
AU  - Pastor, Ferenc
AU  - Popov, Nina
AU  - Marciuš, Marijan
AU  - Krehula, Stjepko
AU  - Antić, Bratislav
AU  - Stanković, Dalibor M.
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10510
AB  - Morphine (MORPH) is natural alkaloid and mainly used as a pain reliever. Its monitoring in human body fluids is crucial for modern medicine. In this paper, we have developed an electrochemical sensor for submicromolar detection of MORPH. The sensor is based on modified carbon paste electrode (CPE) by investigating the FexW1-xO4 ratio in iron tungstate (FeWO4), as well as the ratio of this material in CPE. For the first time, the effect of the iron–tungsten ratio in terms of achieving the best possible electrochemical characteristics for the detection of an important molecule for humans was examined. Morphological and electrochemical characteristics of materials were studied. The best results were obtained using Fe1W3 and 7.5% of modifier in CPE. For MORPH detection, square wave voltammetry (SWV) was optimized. Under the optimized conditions, Fe1W3@CPE resulted in limit of detection (LOD) of the method of 0.58 µM and limit of quantification (LOQ) of 1.94 µM. The linear operating range between 5 and 85 µM of MORPH in the Britton–Robinson buffer solution (BRBS) at pH 8 as supporting electrolyte was obtained. The Fe1W3@CPE sensor resulted in good selectivity and excellent repeatability with relative standard deviation (RSD) and was applied in real-world samples of human urine. Application for direct MORPH detection, without tedious sample pretreatment procedures, suggests that developed electrochemical sensor has appeared to be a suitable competitor for efficient, precise, and accurate monitoring of the MORPH in biological fluids.
T2  - Biosensors
T1  - Electrochemical Determination of Morphine in Urine Samples by Tailoring FeWO4/CPE Sensor
VL  - 12
IS  - 11
SP  - 932
DO  - 10.3390/bios12110932
ER  - 

@article{
author = "Ognjanović, Miloš and Nikolić, Katarina and Bošković, Marko and Pastor, Ferenc and Popov, Nina and Marciuš, Marijan and Krehula, Stjepko and Antić, Bratislav and Stanković, Dalibor M.",
year = "2022",
abstract = "Morphine (MORPH) is natural alkaloid and mainly used as a pain reliever. Its monitoring in human body fluids is crucial for modern medicine. In this paper, we have developed an electrochemical sensor for submicromolar detection of MORPH. The sensor is based on modified carbon paste electrode (CPE) by investigating the FexW1-xO4 ratio in iron tungstate (FeWO4), as well as the ratio of this material in CPE. For the first time, the effect of the iron–tungsten ratio in terms of achieving the best possible electrochemical characteristics for the detection of an important molecule for humans was examined. Morphological and electrochemical characteristics of materials were studied. The best results were obtained using Fe1W3 and 7.5% of modifier in CPE. For MORPH detection, square wave voltammetry (SWV) was optimized. Under the optimized conditions, Fe1W3@CPE resulted in limit of detection (LOD) of the method of 0.58 µM and limit of quantification (LOQ) of 1.94 µM. The linear operating range between 5 and 85 µM of MORPH in the Britton–Robinson buffer solution (BRBS) at pH 8 as supporting electrolyte was obtained. The Fe1W3@CPE sensor resulted in good selectivity and excellent repeatability with relative standard deviation (RSD) and was applied in real-world samples of human urine. Application for direct MORPH detection, without tedious sample pretreatment procedures, suggests that developed electrochemical sensor has appeared to be a suitable competitor for efficient, precise, and accurate monitoring of the MORPH in biological fluids.",
journal = "Biosensors",
title = "Electrochemical Determination of Morphine in Urine Samples by Tailoring FeWO4/CPE Sensor",
volume = "12",
number = "11",
pages = "932",
doi = "10.3390/bios12110932"
}

Ognjanović, M., Nikolić, K., Bošković, M., Pastor, F., Popov, N., Marciuš, M., Krehula, S., Antić, B.,& Stanković, D. M.. (2022). Electrochemical Determination of Morphine in Urine Samples by Tailoring FeWO4/CPE Sensor. in Biosensors, 12(11), 932.
https://doi.org/10.3390/bios12110932

Ognjanović M, Nikolić K, Bošković M, Pastor F, Popov N, Marciuš M, Krehula S, Antić B, Stanković DM. Electrochemical Determination of Morphine in Urine Samples by Tailoring FeWO4/CPE Sensor. in Biosensors. 2022;12(11):932.
doi:10.3390/bios12110932 .

Ognjanović, Miloš, Nikolić, Katarina, Bošković, Marko, Pastor, Ferenc, Popov, Nina, Marciuš, Marijan, Krehula, Stjepko, Antić, Bratislav, Stanković, Dalibor M., "Electrochemical Determination of Morphine in Urine Samples by Tailoring FeWO4/CPE Sensor" in Biosensors, 12, no. 11 (2022):932,
https://doi.org/10.3390/bios12110932 . .

TY  - JOUR
AU  - Popov, Nina
AU  - Ristić, Mira
AU  - Bošković, Marko
AU  - Perović, Marija M.
AU  - Musić, Svetozar
AU  - Stanković, Dalibor M.
AU  - Krehula, Stjepko
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9929
AB  - Sn-doped hematite (α-Fe2O3) nanoparticles of fairly uniform and Sn-dependent size and shape were synthesized via a simple combination of hydrothermal co-precipitation and calcination. The effects of Sn doping on the unit cell size, crystallinity, particle size and shape, as well as the magnetic, optical and photocatalytic properties of hematite nanoparticles were analyzed. The incorporation of Sn4+ ions into the crystal structure of hematite was confirmed by determination of the unit cell expansion due to the replacement of octahedrally coordinated Fe3+ ions by significantly larger Sn4+ ions, as well as a substantially reduced hyperfine magnetic field due to magnetic dilution upon the substitution of non-magnetic Sn4+ ions for magnetic high-spin Fe3+ ions. Sn doping caused a decrease in length and width and an increase in thickness of elongated hematite nanoparticles. Fairly uniform Sn-doped hematite nanoellipsoids or nanocuboids were formed, depending on the Sn content. Temperature dependence of magnetization measurements showed the disappearance of the magnetic phase transition (Morin transition) in hematite upon Sn doping. Magnetic coercivity decreased upon Sn doping due to a decrease in shape anisotropy induced by the change in particle shape from nanorods to nanoellipsoids and nanocuboids. The optical and electronic properties of hematite nanoparticles were significantly affected by Sn doping – the absorption edge was shifted to higher wavelengths, while direct and indirect optical band gaps narrowed with the increasing Sn4+-for-Fe3+ substitution. Sn-doped hematite nanoellipsoids containing 4.3 mol% Sn exhibited a substantial visible light photocatalytic activity in the heterogeneous photo-Fenton process, but this activity significantly decreased with higher Sn doping.
T2  - Journal of Physics and Chemistry of Solids
T1  - Influence of Sn doping on the structural, magnetic, optical and photocatalytic properties of hematite (α-Fe2O3) nanoparticles
VL  - 161
SP  - 110372
DO  - 10.1016/j.jpcs.2021.110372
ER  - 

@article{
author = "Popov, Nina and Ristić, Mira and Bošković, Marko and Perović, Marija M. and Musić, Svetozar and Stanković, Dalibor M. and Krehula, Stjepko",
year = "2022",
abstract = "Sn-doped hematite (α-Fe2O3) nanoparticles of fairly uniform and Sn-dependent size and shape were synthesized via a simple combination of hydrothermal co-precipitation and calcination. The effects of Sn doping on the unit cell size, crystallinity, particle size and shape, as well as the magnetic, optical and photocatalytic properties of hematite nanoparticles were analyzed. The incorporation of Sn4+ ions into the crystal structure of hematite was confirmed by determination of the unit cell expansion due to the replacement of octahedrally coordinated Fe3+ ions by significantly larger Sn4+ ions, as well as a substantially reduced hyperfine magnetic field due to magnetic dilution upon the substitution of non-magnetic Sn4+ ions for magnetic high-spin Fe3+ ions. Sn doping caused a decrease in length and width and an increase in thickness of elongated hematite nanoparticles. Fairly uniform Sn-doped hematite nanoellipsoids or nanocuboids were formed, depending on the Sn content. Temperature dependence of magnetization measurements showed the disappearance of the magnetic phase transition (Morin transition) in hematite upon Sn doping. Magnetic coercivity decreased upon Sn doping due to a decrease in shape anisotropy induced by the change in particle shape from nanorods to nanoellipsoids and nanocuboids. The optical and electronic properties of hematite nanoparticles were significantly affected by Sn doping – the absorption edge was shifted to higher wavelengths, while direct and indirect optical band gaps narrowed with the increasing Sn4+-for-Fe3+ substitution. Sn-doped hematite nanoellipsoids containing 4.3 mol% Sn exhibited a substantial visible light photocatalytic activity in the heterogeneous photo-Fenton process, but this activity significantly decreased with higher Sn doping.",
journal = "Journal of Physics and Chemistry of Solids",
title = "Influence of Sn doping on the structural, magnetic, optical and photocatalytic properties of hematite (α-Fe2O3) nanoparticles",
volume = "161",
pages = "110372",
doi = "10.1016/j.jpcs.2021.110372"
}

Popov, N., Ristić, M., Bošković, M., Perović, M. M., Musić, S., Stanković, D. M.,& Krehula, S.. (2022). Influence of Sn doping on the structural, magnetic, optical and photocatalytic properties of hematite (α-Fe2O3) nanoparticles. in Journal of Physics and Chemistry of Solids, 161, 110372.
https://doi.org/10.1016/j.jpcs.2021.110372

Popov N, Ristić M, Bošković M, Perović MM, Musić S, Stanković DM, Krehula S. Influence of Sn doping on the structural, magnetic, optical and photocatalytic properties of hematite (α-Fe2O3) nanoparticles. in Journal of Physics and Chemistry of Solids. 2022;161:110372.
doi:10.1016/j.jpcs.2021.110372 .

Popov, Nina, Ristić, Mira, Bošković, Marko, Perović, Marija M., Musić, Svetozar, Stanković, Dalibor M., Krehula, Stjepko, "Influence of Sn doping on the structural, magnetic, optical and photocatalytic properties of hematite (α-Fe2O3) nanoparticles" in Journal of Physics and Chemistry of Solids, 161 (2022):110372,
https://doi.org/10.1016/j.jpcs.2021.110372 . .

TY  - JOUR
AU  - Popov, Nina
AU  - Bošković, Marko
AU  - Perović, Marija M.
AU  - Zadro, Krešo
AU  - Gilja, Vanja
AU  - Kratofil Krenula, Ljerka
AU  - Robić, Marko
AU  - Marijan, Marciuš
AU  - Ristić, Mira
AU  - Musić, Svetozar
AU  - Stanković, Dalibor M.
AU  - Krehula, Stjepko
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9882
AB  - Nanosized hematite (α-Fe2O3) is a widely investigated material due to its favourable properties (chemically stable, environmentally safe, inexpensive) and very good performance in several advanced applications. Properties and performance of hematite nanoparticles can be adjusted and improved by modification of particle size and shape, as well as by substitution of Fe3+ ions in the crystal structure of hematite with other metal ions. Ru3+ ions are potentially suitable metal ions for the substitution of Fe3+ ions in hematite because of the same charge and similar ionic radii. In the present work, the effects of Ru3+ ions on the formation and properties of hematite nanorods prepared by combination of hydrothermal precipitation and calcination were investigated. The influence of the molar fraction of Ru3+ ions in the hydrothermal precipitation system on the formation and properties of iron oxide phases was studied. Single-phase goethite (α-FeOOH) nanorods containing incorporated Ru3+ ions were formed in the presence of low levels of Ru3+ ions (<3 mol%), while at higher levels (4 and 5 mol% Ru) hematite nanocylinders, consisting of self-assembled and fused nanoparticles, were obtained. The mechanism of the formation of these iron oxide nanostructures in the presence of Ru3+ ions was explained and compared with the effect of other metal cations reported in the literature. Ru-doped hematite nanorods were formed after calcination of Ru-doped goethite nanorods at 500 °C. A gradual elongation of hematite nanorods with increased Ru doping to highly elongated Ru-doped hematite nanoneedles at 2 mol% Ru was observed and explained. The influence of the Ru doping level on the magnetic properties of hematite nanorods was investigated using Mössbauer spectroscopy and magnetic measurements. Temperature of the transition between antiferromagnetic (AFM) and weakly ferromagnetic (WFM) spin ordering state (Morin transition) gradually rose with increasing Ru3+-for-Fe3+ substitution in hematite. Besides, magnetization of the WFM hematite gradually decreased with Ru doping which was attributed to the reduced canting of two almost antiparallel spin sublattices in this phase. The optical band gap in hematite nanorods was found to get gradually narrower with increased Ru doping due to the modified electronic structure.
T2  - Journal of magnetism and magnetic materials
T2  - Journal of magnetism and magnetic materials
T1  - Effect of Ru3+ ions on the formation, structural, magnetic and optical properties of hematite (α-Fe2O3) nanorods
VL  - 538
SP  - 168316
EP  - 168321
DO  - 10.1016/j.jmmm.2021.168316
ER  - 

@article{
author = "Popov, Nina and Bošković, Marko and Perović, Marija M. and Zadro, Krešo and Gilja, Vanja and Kratofil Krenula, Ljerka and Robić, Marko and Marijan, Marciuš and Ristić, Mira and Musić, Svetozar and Stanković, Dalibor M. and Krehula, Stjepko",
year = "2021",
abstract = "Nanosized hematite (α-Fe2O3) is a widely investigated material due to its favourable properties (chemically stable, environmentally safe, inexpensive) and very good performance in several advanced applications. Properties and performance of hematite nanoparticles can be adjusted and improved by modification of particle size and shape, as well as by substitution of Fe3+ ions in the crystal structure of hematite with other metal ions. Ru3+ ions are potentially suitable metal ions for the substitution of Fe3+ ions in hematite because of the same charge and similar ionic radii. In the present work, the effects of Ru3+ ions on the formation and properties of hematite nanorods prepared by combination of hydrothermal precipitation and calcination were investigated. The influence of the molar fraction of Ru3+ ions in the hydrothermal precipitation system on the formation and properties of iron oxide phases was studied. Single-phase goethite (α-FeOOH) nanorods containing incorporated Ru3+ ions were formed in the presence of low levels of Ru3+ ions (<3 mol%), while at higher levels (4 and 5 mol% Ru) hematite nanocylinders, consisting of self-assembled and fused nanoparticles, were obtained. The mechanism of the formation of these iron oxide nanostructures in the presence of Ru3+ ions was explained and compared with the effect of other metal cations reported in the literature. Ru-doped hematite nanorods were formed after calcination of Ru-doped goethite nanorods at 500 °C. A gradual elongation of hematite nanorods with increased Ru doping to highly elongated Ru-doped hematite nanoneedles at 2 mol% Ru was observed and explained. The influence of the Ru doping level on the magnetic properties of hematite nanorods was investigated using Mössbauer spectroscopy and magnetic measurements. Temperature of the transition between antiferromagnetic (AFM) and weakly ferromagnetic (WFM) spin ordering state (Morin transition) gradually rose with increasing Ru3+-for-Fe3+ substitution in hematite. Besides, magnetization of the WFM hematite gradually decreased with Ru doping which was attributed to the reduced canting of two almost antiparallel spin sublattices in this phase. The optical band gap in hematite nanorods was found to get gradually narrower with increased Ru doping due to the modified electronic structure.",
journal = "Journal of magnetism and magnetic materials, Journal of magnetism and magnetic materials",
title = "Effect of Ru3+ ions on the formation, structural, magnetic and optical properties of hematite (α-Fe2O3) nanorods",
volume = "538",
pages = "168316-168321",
doi = "10.1016/j.jmmm.2021.168316"
}

Popov, N., Bošković, M., Perović, M. M., Zadro, K., Gilja, V., Kratofil Krenula, L., Robić, M., Marijan, M., Ristić, M., Musić, S., Stanković, D. M.,& Krehula, S.. (2021). Effect of Ru3+ ions on the formation, structural, magnetic and optical properties of hematite (α-Fe2O3) nanorods. in Journal of magnetism and magnetic materials, 538, 168316-168321.
https://doi.org/10.1016/j.jmmm.2021.168316

Popov N, Bošković M, Perović MM, Zadro K, Gilja V, Kratofil Krenula L, Robić M, Marijan M, Ristić M, Musić S, Stanković DM, Krehula S. Effect of Ru3+ ions on the formation, structural, magnetic and optical properties of hematite (α-Fe2O3) nanorods. in Journal of magnetism and magnetic materials. 2021;538:168316-168321.
doi:10.1016/j.jmmm.2021.168316 .

Popov, Nina, Bošković, Marko, Perović, Marija M., Zadro, Krešo, Gilja, Vanja, Kratofil Krenula, Ljerka, Robić, Marko, Marijan, Marciuš, Ristić, Mira, Musić, Svetozar, Stanković, Dalibor M., Krehula, Stjepko, "Effect of Ru3+ ions on the formation, structural, magnetic and optical properties of hematite (α-Fe2O3) nanorods" in Journal of magnetism and magnetic materials, 538 (2021):168316-168321,
https://doi.org/10.1016/j.jmmm.2021.168316 . .

TY  - JOUR
AU  - Popov, Nina
AU  - Krehula, Stjepko
AU  - Ristić, Mira
AU  - Kuzmann, Erno
AU  - Homonnay, Zoltan
AU  - Bošković, Marko
AU  - Stanković, Dalibor M.
AU  - Kubuki, Shiro
AU  - Musić, Svetozar
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9619
AB  - Pure and Cr-doped hematite (α-(Fe1-xCrx)2O3, x = 0, 0.026, 0.039, 0.085 or 0.135) nanorods were prepared by a simple co-precipitation and calcination method. Influence of different levels of Cr doping on the change of properties of long and thin pure hematite nanorods was investigated. Cr3+-for-Fe3+ substitution in the crystal structure of hematite was proved by measuring a gradual contraction of the unit cell and a gradual decrease of the hyperfine magnetic field by increasing the Cr molar fraction. Cr doping induced an increase in the width and thickness of hematite nanorods, as well as a decrease in the overall surface area. Low temperature 57Fe Mössbauer spectroscopy showed that the Morin transition in hematite was suppressed by Cr doping to temperatures below 80 K. Magnetic measurements confirmed the suppression of the Morin transition in Cr-doped hematite down to 5 K. Infrared spectra of Cr-doped hematite samples showed shifts of IR bands by Cr3+-for-Fe3+ substitution. Optical properties of α-Fe2O3 nanorods changed significantly by Cr doping – the absorption edge was shifted to higher wavelengths, accompanied by a greater absorption in the visible range and narrowed direct and indirect optical band gaps. The improved visible light photocatalytic activity of hematite nanorods in the heterogeneous photo-Fenton process by moderate Cr doping was measured, which can be attributed to the modifications in electronic structure and optical properties. © 2020 Elsevier Ltd
T2  - Journal of Physics and Chemistry of Solids
T1  - Influence of Cr doping on the structural, magnetic, optical and photocatalytic properties of α-Fe2O3 nanorods
VL  - 148
DO  - 10.1016/j.jpcs.2020.109699
ER  - 

@article{
author = "Popov, Nina and Krehula, Stjepko and Ristić, Mira and Kuzmann, Erno and Homonnay, Zoltan and Bošković, Marko and Stanković, Dalibor M. and Kubuki, Shiro and Musić, Svetozar",
year = "2021",
abstract = "Pure and Cr-doped hematite (α-(Fe1-xCrx)2O3, x = 0, 0.026, 0.039, 0.085 or 0.135) nanorods were prepared by a simple co-precipitation and calcination method. Influence of different levels of Cr doping on the change of properties of long and thin pure hematite nanorods was investigated. Cr3+-for-Fe3+ substitution in the crystal structure of hematite was proved by measuring a gradual contraction of the unit cell and a gradual decrease of the hyperfine magnetic field by increasing the Cr molar fraction. Cr doping induced an increase in the width and thickness of hematite nanorods, as well as a decrease in the overall surface area. Low temperature 57Fe Mössbauer spectroscopy showed that the Morin transition in hematite was suppressed by Cr doping to temperatures below 80 K. Magnetic measurements confirmed the suppression of the Morin transition in Cr-doped hematite down to 5 K. Infrared spectra of Cr-doped hematite samples showed shifts of IR bands by Cr3+-for-Fe3+ substitution. Optical properties of α-Fe2O3 nanorods changed significantly by Cr doping – the absorption edge was shifted to higher wavelengths, accompanied by a greater absorption in the visible range and narrowed direct and indirect optical band gaps. The improved visible light photocatalytic activity of hematite nanorods in the heterogeneous photo-Fenton process by moderate Cr doping was measured, which can be attributed to the modifications in electronic structure and optical properties. © 2020 Elsevier Ltd",
journal = "Journal of Physics and Chemistry of Solids",
title = "Influence of Cr doping on the structural, magnetic, optical and photocatalytic properties of α-Fe2O3 nanorods",
volume = "148",
doi = "10.1016/j.jpcs.2020.109699"
}

Popov, N., Krehula, S., Ristić, M., Kuzmann, E., Homonnay, Z., Bošković, M., Stanković, D. M., Kubuki, S.,& Musić, S.. (2021). Influence of Cr doping on the structural, magnetic, optical and photocatalytic properties of α-Fe2O3 nanorods. in Journal of Physics and Chemistry of Solids, 148.
https://doi.org/10.1016/j.jpcs.2020.109699

Popov N, Krehula S, Ristić M, Kuzmann E, Homonnay Z, Bošković M, Stanković DM, Kubuki S, Musić S. Influence of Cr doping on the structural, magnetic, optical and photocatalytic properties of α-Fe2O3 nanorods. in Journal of Physics and Chemistry of Solids. 2021;148.
doi:10.1016/j.jpcs.2020.109699 .

Popov, Nina, Krehula, Stjepko, Ristić, Mira, Kuzmann, Erno, Homonnay, Zoltan, Bošković, Marko, Stanković, Dalibor M., Kubuki, Shiro, Musić, Svetozar, "Influence of Cr doping on the structural, magnetic, optical and photocatalytic properties of α-Fe2O3 nanorods" in Journal of Physics and Chemistry of Solids, 148 (2021),
https://doi.org/10.1016/j.jpcs.2020.109699 . .

TY  - JOUR
AU  - Popov, Nina
AU  - Bošković, Marko
AU  - Perović, Marija M.
AU  - Németh, Zoltán
AU  - Wang, Junhu
AU  - Kuang, Zhichong
AU  - Reissner, Michael
AU  - Kuzmann, Ernő
AU  - Homonnay, Zoltán
AU  - Kubuki, Shiro
AU  - Marciuš, Marijan
AU  - Ristić, Mira
AU  - Musić, Svetozar
AU  - Stanković, Dalibor M.
AU  - Krehula, Stjepko
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9516
AB  - Pure hematite nanorods and very long and thin cobalt-doped hematite nanorods (nanoneedles) were prepared by a combined precipitation and annealing method. The influence of the level of cobalt doping on different properties of hematite nanorods was investigated. Incorporation of cobalt in the form of low-spin Co3+ ions into the structure of hematite by substitution for high-spin Fe3+ ions was proved by determination of a significant unit cell contraction by powder X-ray diffraction (PXRD) and characteristic positions of the absorption edge in X-ray absorption near edge structure (XANES) spectra and peaks in X-ray emission (XES) spectra. Cobalt doping caused a gradual elongation and thinning of hematite nanorods – very long and thin 1D nanoparticles (nanoneedles) were formed in the presence of 10 and 12 mol% Co. Magnetic measurements showed a strong increase in low-temperature remanent magnetization and coercivity upon cobalt doping, as well as a disappearance of the Morin transition, which was also confirmed by Mössbauer spectroscopy. Cobalt doping significantly affected optical properties of hematite nanorods – absorption in the visible and NIR ranges increased, which was accompanied by narrowing of the optical band gap. Compared with pure hematite nanorods cobalt-doped hematite nanoneedles showed a significantly better electrocatalytic activity for the oxygen evolution reaction (OER). © 2020 Elsevier Ltd
T2  - Journal of Physics and Chemistry of Solids
T1  - Influence of low-spin Co3+ for high-spin Fe3+ substitution on the structural, magnetic, optical and catalytic properties of hematite (α-Fe2O3) nanorods
VL  - 152
SP  - 109929
DO  - 10.1016/j.jpcs.2020.109929
ER  - 

@article{
author = "Popov, Nina and Bošković, Marko and Perović, Marija M. and Németh, Zoltán and Wang, Junhu and Kuang, Zhichong and Reissner, Michael and Kuzmann, Ernő and Homonnay, Zoltán and Kubuki, Shiro and Marciuš, Marijan and Ristić, Mira and Musić, Svetozar and Stanković, Dalibor M. and Krehula, Stjepko",
year = "2021",
abstract = "Pure hematite nanorods and very long and thin cobalt-doped hematite nanorods (nanoneedles) were prepared by a combined precipitation and annealing method. The influence of the level of cobalt doping on different properties of hematite nanorods was investigated. Incorporation of cobalt in the form of low-spin Co3+ ions into the structure of hematite by substitution for high-spin Fe3+ ions was proved by determination of a significant unit cell contraction by powder X-ray diffraction (PXRD) and characteristic positions of the absorption edge in X-ray absorption near edge structure (XANES) spectra and peaks in X-ray emission (XES) spectra. Cobalt doping caused a gradual elongation and thinning of hematite nanorods – very long and thin 1D nanoparticles (nanoneedles) were formed in the presence of 10 and 12 mol% Co. Magnetic measurements showed a strong increase in low-temperature remanent magnetization and coercivity upon cobalt doping, as well as a disappearance of the Morin transition, which was also confirmed by Mössbauer spectroscopy. Cobalt doping significantly affected optical properties of hematite nanorods – absorption in the visible and NIR ranges increased, which was accompanied by narrowing of the optical band gap. Compared with pure hematite nanorods cobalt-doped hematite nanoneedles showed a significantly better electrocatalytic activity for the oxygen evolution reaction (OER). © 2020 Elsevier Ltd",
journal = "Journal of Physics and Chemistry of Solids",
title = "Influence of low-spin Co3+ for high-spin Fe3+ substitution on the structural, magnetic, optical and catalytic properties of hematite (α-Fe2O3) nanorods",
volume = "152",
pages = "109929",
doi = "10.1016/j.jpcs.2020.109929"
}

Popov, N., Bošković, M., Perović, M. M., Németh, Z., Wang, J., Kuang, Z., Reissner, M., Kuzmann, E., Homonnay, Z., Kubuki, S., Marciuš, M., Ristić, M., Musić, S., Stanković, D. M.,& Krehula, S.. (2021). Influence of low-spin Co3+ for high-spin Fe3+ substitution on the structural, magnetic, optical and catalytic properties of hematite (α-Fe2O3) nanorods. in Journal of Physics and Chemistry of Solids, 152, 109929.
https://doi.org/10.1016/j.jpcs.2020.109929

Popov N, Bošković M, Perović MM, Németh Z, Wang J, Kuang Z, Reissner M, Kuzmann E, Homonnay Z, Kubuki S, Marciuš M, Ristić M, Musić S, Stanković DM, Krehula S. Influence of low-spin Co3+ for high-spin Fe3+ substitution on the structural, magnetic, optical and catalytic properties of hematite (α-Fe2O3) nanorods. in Journal of Physics and Chemistry of Solids. 2021;152:109929.
doi:10.1016/j.jpcs.2020.109929 .

Popov, Nina, Bošković, Marko, Perović, Marija M., Németh, Zoltán, Wang, Junhu, Kuang, Zhichong, Reissner, Michael, Kuzmann, Ernő, Homonnay, Zoltán, Kubuki, Shiro, Marciuš, Marijan, Ristić, Mira, Musić, Svetozar, Stanković, Dalibor M., Krehula, Stjepko, "Influence of low-spin Co3+ for high-spin Fe3+ substitution on the structural, magnetic, optical and catalytic properties of hematite (α-Fe2O3) nanorods" in Journal of Physics and Chemistry of Solids, 152 (2021):109929,
https://doi.org/10.1016/j.jpcs.2020.109929 . .

TY  - JOUR
AU  - Krehula, Stjepko
AU  - Ristić, Mira
AU  - Mitar, Ivana
AU  - Wu, Chuchu
AU  - Li, Xuning
AU  - Jiang, Luhua
AU  - Wang, Junhu H.
AU  - Sun, Gongquan
AU  - Zhang, Tao
AU  - Perović, Marija M.
AU  - Bošković, Marko
AU  - Antić, Bratislav
AU  - Musić, Svetozar
PY  - 2018
UR  - https://hrcak.srce.hr/file/309798
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8100
AB  - Ni-doped goethite (α-FeOOH) nanorods were synthesized from mixed Fe(III)-Ni(II) nitrate solutions with various Ni/(Ni+Fe) ratios (0, 5, 10, 20, 33 and 50 mol % Ni) by hydrothermal precipitation in a highly alkaline medium using the strong organic alkali, tetramethylammonium hydroxide (TMAH). Ni-doped hematite (α-Fe2O3) nanorods were obtained by calcination of Ni-doped goethite nanorods at 400 °C. The Ni 2+ -for-Fe 3+ substitution in goethite and hematite was confirmed by determination of the unit cell expansion (due to the difference in the ionic radii of Fe 3+ and Ni 2+ ) using XRPD and determination of the reduction of a hyperfine magnetic field (due to the difference in magnetic moments of Fe 3+ and Ni 2+ ) using Mössbauer spectroscopy. Single-phase goethite nanorods were found in samples containing 0 or 5 mol % Ni. A higher Ni content in the precipitation system (10 mol % or more) resulted in a higher Ni 2+ -for-Fe 3+ substitution in goethite, and larger Ni-doped goethite nanorods, though with the presence of low crystalline Ni-containing ferrihydrite and Ni ferrite (NiFe2O4) as additional phases. Significant changes in FT-IR and UV-Vis-NIR spectra of prepared samples were observed with increasing Ni content. Electrochemical measurements of samples showed a strong increase in oxygen evolution reaction (OER) electrocatalytic activity with increasing Ni content. © 2018 Croatian Chemical Society. All Rights Reserved.
T2  - Croatica Chemica Acta
T1  - Synthesis and Properties of Ni-doped Goethite and Ni-doped Hematite Nanorods
VL  - 91
IS  - 3
SP  - 389
EP  - 401
DO  - 10.5562/cca3402
ER  - 

@article{
author = "Krehula, Stjepko and Ristić, Mira and Mitar, Ivana and Wu, Chuchu and Li, Xuning and Jiang, Luhua and Wang, Junhu H. and Sun, Gongquan and Zhang, Tao and Perović, Marija M. and Bošković, Marko and Antić, Bratislav and Musić, Svetozar",
year = "2018",
abstract = "Ni-doped goethite (α-FeOOH) nanorods were synthesized from mixed Fe(III)-Ni(II) nitrate solutions with various Ni/(Ni+Fe) ratios (0, 5, 10, 20, 33 and 50 mol % Ni) by hydrothermal precipitation in a highly alkaline medium using the strong organic alkali, tetramethylammonium hydroxide (TMAH). Ni-doped hematite (α-Fe2O3) nanorods were obtained by calcination of Ni-doped goethite nanorods at 400 °C. The Ni 2+ -for-Fe 3+ substitution in goethite and hematite was confirmed by determination of the unit cell expansion (due to the difference in the ionic radii of Fe 3+ and Ni 2+ ) using XRPD and determination of the reduction of a hyperfine magnetic field (due to the difference in magnetic moments of Fe 3+ and Ni 2+ ) using Mössbauer spectroscopy. Single-phase goethite nanorods were found in samples containing 0 or 5 mol % Ni. A higher Ni content in the precipitation system (10 mol % or more) resulted in a higher Ni 2+ -for-Fe 3+ substitution in goethite, and larger Ni-doped goethite nanorods, though with the presence of low crystalline Ni-containing ferrihydrite and Ni ferrite (NiFe2O4) as additional phases. Significant changes in FT-IR and UV-Vis-NIR spectra of prepared samples were observed with increasing Ni content. Electrochemical measurements of samples showed a strong increase in oxygen evolution reaction (OER) electrocatalytic activity with increasing Ni content. © 2018 Croatian Chemical Society. All Rights Reserved.",
journal = "Croatica Chemica Acta",
title = "Synthesis and Properties of Ni-doped Goethite and Ni-doped Hematite Nanorods",
volume = "91",
number = "3",
pages = "389-401",
doi = "10.5562/cca3402"
}

Krehula, S., Ristić, M., Mitar, I., Wu, C., Li, X., Jiang, L., Wang, J. H., Sun, G., Zhang, T., Perović, M. M., Bošković, M., Antić, B.,& Musić, S.. (2018). Synthesis and Properties of Ni-doped Goethite and Ni-doped Hematite Nanorods. in Croatica Chemica Acta, 91(3), 389-401.
https://doi.org/10.5562/cca3402

Krehula S, Ristić M, Mitar I, Wu C, Li X, Jiang L, Wang JH, Sun G, Zhang T, Perović MM, Bošković M, Antić B, Musić S. Synthesis and Properties of Ni-doped Goethite and Ni-doped Hematite Nanorods. in Croatica Chemica Acta. 2018;91(3):389-401.
doi:10.5562/cca3402 .

Krehula, Stjepko, Ristić, Mira, Mitar, Ivana, Wu, Chuchu, Li, Xuning, Jiang, Luhua, Wang, Junhu H., Sun, Gongquan, Zhang, Tao, Perović, Marija M., Bošković, Marko, Antić, Bratislav, Musić, Svetozar, "Synthesis and Properties of Ni-doped Goethite and Ni-doped Hematite Nanorods" in Croatica Chemica Acta, 91, no. 3 (2018):389-401,
https://doi.org/10.5562/cca3402 . .

TY  - JOUR
AU  - Krehula, Stjepko
AU  - Ristić, Mira
AU  - Wu, Chuchu
AU  - Li, Xuning
AU  - Jiang, Luhua
AU  - Wang, Junhu H.
AU  - Sun, Gongquan
AU  - Zhang, Tao
AU  - Perović, Marija M.
AU  - Bošković, Marko
AU  - Antić, Bratislav
AU  - Kratofil Krehula, Ljerka
AU  - Kobzi, Balazs
AU  - Kubuki, Shiro
AU  - Musić, Svetozar
PY  - 2018
UR  - http://linkinghub.elsevier.com/retrieve/pii/S0925838818313197
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7744
AB  - This paper systematically examines the influence of the level of Fe(III) doping on the crystal structure and other properties of Ni(OH)(2). Reference beta-Ni(OH)(2) and Fe-doped Ni(OH)(2) samples were synthesized by hydrothermal precipitation of mixed Ni(II) and Fe(III) nitrate aqueous solutions in a highly alkaline medium. The samples were investigated using X-ray powder diffraction (XRPD), scanning and transmission electron microscopy (FE-SEM and TEM), energy dispersive X-ray spectroscopy (EDS), Mossbauer spectroscopy, magnetic measurements, Fourier transform infrared (FT-IR) spectroscopy, ultraviolet-visible-near infrared (UV-Vis-NIR) spectroscopy, thermogravimetric analysis (TGA) and electrochemical measurements. Incorporation of Fe in beta-Ni(OH)(2) by cation substitution was confirmed from the shifts in position of XRPD lines due to the difference in the ionic radius of Fe3+ and Ni-2. The Fe-3-for-Ni2+ substitution in beta-Ni(OH)(2) caused formation of an interstratifled structure with beta-Ni(OH)(2) and alpha-Ni(OH)(2) structural units interconnected within the same structural layers and crystallites. Mossbauer spectra revealed the presence of Fe3+ ions in highly distorted octahedral sites, presumably at the boundary between the alpha-Ni(OH)(2) and beta-Ni(OH)(2) structural units within the same structural layer. Electrochemical measurements showed significant increase in oxygen evolution reaction (OER) catalytic activity of Fe-doped Ni(OH)(2) compared to pure phase. (C) 2018 Elsevier B.V. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - Influence of Fe(III) doping on the crystal structure and properties of hydrothermally prepared β-Ni(OH) 2 nanostructures
VL  - 750
SP  - 687
EP  - 695
DO  - 10.1016/j.jallcom.2018.04.032
ER  - 

@article{
author = "Krehula, Stjepko and Ristić, Mira and Wu, Chuchu and Li, Xuning and Jiang, Luhua and Wang, Junhu H. and Sun, Gongquan and Zhang, Tao and Perović, Marija M. and Bošković, Marko and Antić, Bratislav and Kratofil Krehula, Ljerka and Kobzi, Balazs and Kubuki, Shiro and Musić, Svetozar",
year = "2018",
abstract = "This paper systematically examines the influence of the level of Fe(III) doping on the crystal structure and other properties of Ni(OH)(2). Reference beta-Ni(OH)(2) and Fe-doped Ni(OH)(2) samples were synthesized by hydrothermal precipitation of mixed Ni(II) and Fe(III) nitrate aqueous solutions in a highly alkaline medium. The samples were investigated using X-ray powder diffraction (XRPD), scanning and transmission electron microscopy (FE-SEM and TEM), energy dispersive X-ray spectroscopy (EDS), Mossbauer spectroscopy, magnetic measurements, Fourier transform infrared (FT-IR) spectroscopy, ultraviolet-visible-near infrared (UV-Vis-NIR) spectroscopy, thermogravimetric analysis (TGA) and electrochemical measurements. Incorporation of Fe in beta-Ni(OH)(2) by cation substitution was confirmed from the shifts in position of XRPD lines due to the difference in the ionic radius of Fe3+ and Ni-2. The Fe-3-for-Ni2+ substitution in beta-Ni(OH)(2) caused formation of an interstratifled structure with beta-Ni(OH)(2) and alpha-Ni(OH)(2) structural units interconnected within the same structural layers and crystallites. Mossbauer spectra revealed the presence of Fe3+ ions in highly distorted octahedral sites, presumably at the boundary between the alpha-Ni(OH)(2) and beta-Ni(OH)(2) structural units within the same structural layer. Electrochemical measurements showed significant increase in oxygen evolution reaction (OER) catalytic activity of Fe-doped Ni(OH)(2) compared to pure phase. (C) 2018 Elsevier B.V. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "Influence of Fe(III) doping on the crystal structure and properties of hydrothermally prepared β-Ni(OH) 2 nanostructures",
volume = "750",
pages = "687-695",
doi = "10.1016/j.jallcom.2018.04.032"
}

Krehula, S., Ristić, M., Wu, C., Li, X., Jiang, L., Wang, J. H., Sun, G., Zhang, T., Perović, M. M., Bošković, M., Antić, B., Kratofil Krehula, L., Kobzi, B., Kubuki, S.,& Musić, S.. (2018). Influence of Fe(III) doping on the crystal structure and properties of hydrothermally prepared β-Ni(OH) 2 nanostructures. in Journal of Alloys and Compounds, 750, 687-695.
https://doi.org/10.1016/j.jallcom.2018.04.032

Krehula S, Ristić M, Wu C, Li X, Jiang L, Wang JH, Sun G, Zhang T, Perović MM, Bošković M, Antić B, Kratofil Krehula L, Kobzi B, Kubuki S, Musić S. Influence of Fe(III) doping on the crystal structure and properties of hydrothermally prepared β-Ni(OH) 2 nanostructures. in Journal of Alloys and Compounds. 2018;750:687-695.
doi:10.1016/j.jallcom.2018.04.032 .

Krehula, Stjepko, Ristić, Mira, Wu, Chuchu, Li, Xuning, Jiang, Luhua, Wang, Junhu H., Sun, Gongquan, Zhang, Tao, Perović, Marija M., Bošković, Marko, Antić, Bratislav, Kratofil Krehula, Ljerka, Kobzi, Balazs, Kubuki, Shiro, Musić, Svetozar, "Influence of Fe(III) doping on the crystal structure and properties of hydrothermally prepared β-Ni(OH) 2 nanostructures" in Journal of Alloys and Compounds, 750 (2018):687-695,
https://doi.org/10.1016/j.jallcom.2018.04.032 . .

TY  - JOUR
AU  - Krehula, Stjepko
AU  - Ristić, Mira
AU  - Kubuki, Shiro
AU  - Iida, Yusuke
AU  - Perović, Marija M.
AU  - Fabian, Martin
AU  - Musić, Svetozar
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/265
AB  - Various mixed Fe-Ga oxides were prepared by the calcination of mixed Fe-Ga oxyhydroxide precursors (alpha-Fe1 xGaxOOH solid solutions, 0 LT = x LT = 1) at 500 or 1000 degrees C. Isostructural corundum-type oxides alpha-Fe2O3 and alpha-Ga2O3, as well as their solid solutions alpha-Fe-2 xGaxO3 in the entire concentration range (x = 0, 0.4, 1, 1.6 and 2) were prepared by calcination at 500 degrees C. An increase in the Ga content in alpha-Fe2 xGaxO3 resulted in a reduction of the unit cell size, a weakened hyperfine magnetic field, a disappearance of the Morin transition, an increase of magnetization at low temperatures, a shift in the position of IR bands to higher wavenumbers, and a lower intensity of absorption bands in the UV-Vis-NIR spectra. The calcination of Fe-Ga oxyhydroxides at 1000 degrees C resulted in the formation of a rhombohedral alpha-Fe-2 xGaxO3 phase for x = 0 and 0.4. An orthorhombic GaFeO3 phase with Fe3+ cations located in 3 different octahedral sites was obtained by the calcination at 1000 degrees C of mixed Fe-Ga oxyhydroxide with the Fe:Ga ratio of 1:1. A monoclinic phase b-Fe-2 xGaxO3 (x = 1.6 and 2) was obtained by the calcination at 1000 degrees C of Fe-Ga oxyhydroxides with 80 and 100 mol% Ga. The monoclinic beta-Ga1.6Fe0.4O3 showed two strong luminescence peaks in the blue region of the PL spectrum. (C) 2015 Elsevier B.V. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - Synthesis and microstructural properties of mixed iron-gallium oxides
VL  - 634
SP  - 130
EP  - 141
DO  - 10.1016/j.jallcom.2015.02.065
ER  - 

@article{
author = "Krehula, Stjepko and Ristić, Mira and Kubuki, Shiro and Iida, Yusuke and Perović, Marija M. and Fabian, Martin and Musić, Svetozar",
year = "2015",
abstract = "Various mixed Fe-Ga oxides were prepared by the calcination of mixed Fe-Ga oxyhydroxide precursors (alpha-Fe1 xGaxOOH solid solutions, 0 LT = x LT = 1) at 500 or 1000 degrees C. Isostructural corundum-type oxides alpha-Fe2O3 and alpha-Ga2O3, as well as their solid solutions alpha-Fe-2 xGaxO3 in the entire concentration range (x = 0, 0.4, 1, 1.6 and 2) were prepared by calcination at 500 degrees C. An increase in the Ga content in alpha-Fe2 xGaxO3 resulted in a reduction of the unit cell size, a weakened hyperfine magnetic field, a disappearance of the Morin transition, an increase of magnetization at low temperatures, a shift in the position of IR bands to higher wavenumbers, and a lower intensity of absorption bands in the UV-Vis-NIR spectra. The calcination of Fe-Ga oxyhydroxides at 1000 degrees C resulted in the formation of a rhombohedral alpha-Fe-2 xGaxO3 phase for x = 0 and 0.4. An orthorhombic GaFeO3 phase with Fe3+ cations located in 3 different octahedral sites was obtained by the calcination at 1000 degrees C of mixed Fe-Ga oxyhydroxide with the Fe:Ga ratio of 1:1. A monoclinic phase b-Fe-2 xGaxO3 (x = 1.6 and 2) was obtained by the calcination at 1000 degrees C of Fe-Ga oxyhydroxides with 80 and 100 mol% Ga. The monoclinic beta-Ga1.6Fe0.4O3 showed two strong luminescence peaks in the blue region of the PL spectrum. (C) 2015 Elsevier B.V. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "Synthesis and microstructural properties of mixed iron-gallium oxides",
volume = "634",
pages = "130-141",
doi = "10.1016/j.jallcom.2015.02.065"
}

Krehula, S., Ristić, M., Kubuki, S., Iida, Y., Perović, M. M., Fabian, M.,& Musić, S.. (2015). Synthesis and microstructural properties of mixed iron-gallium oxides. in Journal of Alloys and Compounds, 634, 130-141.
https://doi.org/10.1016/j.jallcom.2015.02.065

Krehula S, Ristić M, Kubuki S, Iida Y, Perović MM, Fabian M, Musić S. Synthesis and microstructural properties of mixed iron-gallium oxides. in Journal of Alloys and Compounds. 2015;634:130-141.
doi:10.1016/j.jallcom.2015.02.065 .

Krehula, Stjepko, Ristić, Mira, Kubuki, Shiro, Iida, Yusuke, Perović, Marija M., Fabian, Martin, Musić, Svetozar, "Synthesis and microstructural properties of mixed iron-gallium oxides" in Journal of Alloys and Compounds, 634 (2015):130-141,
https://doi.org/10.1016/j.jallcom.2015.02.065 . .