TY  - CONF
AU  - Pjević, Dejan
AU  - Peruško, Davor
AU  - Savić, Tatjana
AU  - Novaković, Mirjana
AU  - Popović, Maja
AU  - Potočnik, Jelena
AU  - Petrović, Suzana
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11901
AB  - INTRODUCTION: Titanium dioxide (TiO2) thin films showed as promising materials for photocatalytic degradation of pollutants in water under irradiation of UV-light. It is favorable material for photocatalytic processes because of its non-toxicity, high photosensitivity, large band gap and stability. One of the way to increase efficiency of TiO2 thin films is by doping and coating with metals. Metal-doped TiO2 can reduce electron-hole recombination and increase hydroxyl radical concentration on the surface of TiO2, resulting in increase in the photocatalytic activity1. In studies of J.M.Jung at al.1 with Au-buffered TiO2 thin films and V. S. Mohite et al.2 with doped TiO2 thin films showed that this systems have enhanced photocatalytic activity in comparison to pure TiO2 thin films. Also recent study3 showed that Au doped TiO2 thin films are great candidates beside photocatalysis for enhancing visible light water splitting. EXPERIMENTAL STUDY TiO2 and TiO2:Au thin films were obtained by DC magnetron sputtering of Ti target with Ar ions in O2 atmosphere. In the case of doped TiO2 thin films with Au, three different systems were deposited for comparison (fig.1): Buffering Au layer into the TiO2 layer (b), subsurface buffering of Au with island formation of Au on the surface and etching the surface of TiO2 layer by HF and applying Au nanoparticles on the surface. Annealing of the samples was performed in air and N2 atmospheres on 600 °C for better crystallinity and release of defects. For structural analyses XRD, XPS, TEM and SEM methods were used, while for optical characterization UV/Vis method was used. The photo-degradation rate was measured using Rhodamine B which simulated pollutant. Fig. 1: Experimental setup. RESULTS AND DISCUSSION Structural analysis has shown that as deposited films have amorphous-like structures, while post-deposition thermal annealing in air for 3 hours inducted significantly better crystallinity in thin films with anatase phase dominating. SEM analysis showed the presence of 10 nm Au buffered layer in crystalline structure of TiO2 and also on the surface. Optical measurements showed shift of the absorbance edge in UV/Vis spectra toward visible light wavelengths. Presence of metal dopant in the structure probably has induced some new energy sites in the region of TiO2 energy gap. Analysis of the binding energy in the corresponding XPS spectra showed that deposited films have good stoichiometry of TiO2. At binding energies of 530 eV where O1s line is present there is broadening toward higher energies and can be attributed to surface hydroxyl group. Presence of this group on the surface of the films is favorable for photo-degradation processes. CONCLUSION Obtained TiO2 thin films after deposition were amorphous-like structured, and after annealing on 600 °C anatase phase dominates in the structure. All Au doped TiO2 thin films showed better photo-degradation rates then pure TiO2. Presence of the gold clusters on the surface of the thin film showed of significant importance. Future work will be concentrated on understanding mechanisms of different Au doping sites in TiO2 crystal structure on its photocatalytic activity.
C3  - ANM 2019 : Advanced Nano Materials 2019 : Book of abstracts
T1  - Different approaches for enhancing photocatalytic properties of TiO2:Au thin films deposited by DC sputtering
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11901
ER  - 

@conference{
author = "Pjević, Dejan and Peruško, Davor and Savić, Tatjana and Novaković, Mirjana and Popović, Maja and Potočnik, Jelena and Petrović, Suzana",
year = "2019",
abstract = "INTRODUCTION: Titanium dioxide (TiO2) thin films showed as promising materials for photocatalytic degradation of pollutants in water under irradiation of UV-light. It is favorable material for photocatalytic processes because of its non-toxicity, high photosensitivity, large band gap and stability. One of the way to increase efficiency of TiO2 thin films is by doping and coating with metals. Metal-doped TiO2 can reduce electron-hole recombination and increase hydroxyl radical concentration on the surface of TiO2, resulting in increase in the photocatalytic activity1. In studies of J.M.Jung at al.1 with Au-buffered TiO2 thin films and V. S. Mohite et al.2 with doped TiO2 thin films showed that this systems have enhanced photocatalytic activity in comparison to pure TiO2 thin films. Also recent study3 showed that Au doped TiO2 thin films are great candidates beside photocatalysis for enhancing visible light water splitting. EXPERIMENTAL STUDY TiO2 and TiO2:Au thin films were obtained by DC magnetron sputtering of Ti target with Ar ions in O2 atmosphere. In the case of doped TiO2 thin films with Au, three different systems were deposited for comparison (fig.1): Buffering Au layer into the TiO2 layer (b), subsurface buffering of Au with island formation of Au on the surface and etching the surface of TiO2 layer by HF and applying Au nanoparticles on the surface. Annealing of the samples was performed in air and N2 atmospheres on 600 °C for better crystallinity and release of defects. For structural analyses XRD, XPS, TEM and SEM methods were used, while for optical characterization UV/Vis method was used. The photo-degradation rate was measured using Rhodamine B which simulated pollutant. Fig. 1: Experimental setup. RESULTS AND DISCUSSION Structural analysis has shown that as deposited films have amorphous-like structures, while post-deposition thermal annealing in air for 3 hours inducted significantly better crystallinity in thin films with anatase phase dominating. SEM analysis showed the presence of 10 nm Au buffered layer in crystalline structure of TiO2 and also on the surface. Optical measurements showed shift of the absorbance edge in UV/Vis spectra toward visible light wavelengths. Presence of metal dopant in the structure probably has induced some new energy sites in the region of TiO2 energy gap. Analysis of the binding energy in the corresponding XPS spectra showed that deposited films have good stoichiometry of TiO2. At binding energies of 530 eV where O1s line is present there is broadening toward higher energies and can be attributed to surface hydroxyl group. Presence of this group on the surface of the films is favorable for photo-degradation processes. CONCLUSION Obtained TiO2 thin films after deposition were amorphous-like structured, and after annealing on 600 °C anatase phase dominates in the structure. All Au doped TiO2 thin films showed better photo-degradation rates then pure TiO2. Presence of the gold clusters on the surface of the thin film showed of significant importance. Future work will be concentrated on understanding mechanisms of different Au doping sites in TiO2 crystal structure on its photocatalytic activity.",
journal = "ANM 2019 : Advanced Nano Materials 2019 : Book of abstracts",
title = "Different approaches for enhancing photocatalytic properties of TiO2:Au thin films deposited by DC sputtering",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11901"
}

Pjević, D., Peruško, D., Savić, T., Novaković, M., Popović, M., Potočnik, J.,& Petrović, S.. (2019). Different approaches for enhancing photocatalytic properties of TiO2:Au thin films deposited by DC sputtering. in ANM 2019 : Advanced Nano Materials 2019 : Book of abstracts.
https://hdl.handle.net/21.15107/rcub_vinar_11901

Pjević D, Peruško D, Savić T, Novaković M, Popović M, Potočnik J, Petrović S. Different approaches for enhancing photocatalytic properties of TiO2:Au thin films deposited by DC sputtering. in ANM 2019 : Advanced Nano Materials 2019 : Book of abstracts. 2019;.
https://hdl.handle.net/21.15107/rcub_vinar_11901 .

Pjević, Dejan, Peruško, Davor, Savić, Tatjana, Novaković, Mirjana, Popović, Maja, Potočnik, Jelena, Petrović, Suzana, "Different approaches for enhancing photocatalytic properties of TiO2:Au thin films deposited by DC sputtering" in ANM 2019 : Advanced Nano Materials 2019 : Book of abstracts (2019),
https://hdl.handle.net/21.15107/rcub_vinar_11901 .

TY  - JOUR
AU  - Zmejkoski, Danica
AU  - Petković, Branka
AU  - Pavković-Lučić, Sofija
AU  - Prolić, Zlatko M.
AU  - Anđelković, Marko
AU  - Savić, Tatjana
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1540
AB  - Purpose: Extremely low frequency (ELF) magnetic fields as essential ecological factors may induce specific responses in genetically different lines. The object of this study was to investigate the impact of the ELF magnetic field on fitness components and locomotor activity of five Drosophila subobscura isofemale (IF) lines.Materials and methods: Each D. subobscura IF line, arbitrarily named: B16/1, B24/4, B39/1, B57/2 and B69/5, was maintained in five full-sib inbreeding generations. Their genetic structures were defined based on the mitochondrial DNA variability. Egg-first instar larvae and 1-day-old flies were exposed to an ELF magnetic field (50Hz, 0.5mT, 48h) and thereafter, fitness components and locomotor activity of males and females in an open field test were observed for each selected IF line, respectively.Results: Exposure of egg-first instar larvae to an ELF magnetic field shortened developmental time, and did not affect the viability and sex ratio of D. subobscura IF lines. Exposure of 1-day-old males and females IF lines B16/1 and B24/4 to an ELF magnetic field significantly decreased their locomotor activity and this effect lasted longer in females than males.Conclusions: These results indicate various responses of D. subobscura IF lines to the applied ELF magnetic field depending on their genetic background.
T2  - International Journal of Radiation Biology
T1  - Different responses of Drosophila subobscura isofemale lines to extremely low frequency magnetic field (50Hz, 0.5mT): fitness components and locomotor activity
VL  - 93
IS  - 5
SP  - 544
EP  - 552
DO  - 10.1080/09553002.2017.1268281
ER  - 

@article{
author = "Zmejkoski, Danica and Petković, Branka and Pavković-Lučić, Sofija and Prolić, Zlatko M. and Anđelković, Marko and Savić, Tatjana",
year = "2017",
abstract = "Purpose: Extremely low frequency (ELF) magnetic fields as essential ecological factors may induce specific responses in genetically different lines. The object of this study was to investigate the impact of the ELF magnetic field on fitness components and locomotor activity of five Drosophila subobscura isofemale (IF) lines.Materials and methods: Each D. subobscura IF line, arbitrarily named: B16/1, B24/4, B39/1, B57/2 and B69/5, was maintained in five full-sib inbreeding generations. Their genetic structures were defined based on the mitochondrial DNA variability. Egg-first instar larvae and 1-day-old flies were exposed to an ELF magnetic field (50Hz, 0.5mT, 48h) and thereafter, fitness components and locomotor activity of males and females in an open field test were observed for each selected IF line, respectively.Results: Exposure of egg-first instar larvae to an ELF magnetic field shortened developmental time, and did not affect the viability and sex ratio of D. subobscura IF lines. Exposure of 1-day-old males and females IF lines B16/1 and B24/4 to an ELF magnetic field significantly decreased their locomotor activity and this effect lasted longer in females than males.Conclusions: These results indicate various responses of D. subobscura IF lines to the applied ELF magnetic field depending on their genetic background.",
journal = "International Journal of Radiation Biology",
title = "Different responses of Drosophila subobscura isofemale lines to extremely low frequency magnetic field (50Hz, 0.5mT): fitness components and locomotor activity",
volume = "93",
number = "5",
pages = "544-552",
doi = "10.1080/09553002.2017.1268281"
}

Zmejkoski, D., Petković, B., Pavković-Lučić, S., Prolić, Z. M., Anđelković, M.,& Savić, T.. (2017). Different responses of Drosophila subobscura isofemale lines to extremely low frequency magnetic field (50Hz, 0.5mT): fitness components and locomotor activity. in International Journal of Radiation Biology, 93(5), 544-552.
https://doi.org/10.1080/09553002.2017.1268281

Zmejkoski D, Petković B, Pavković-Lučić S, Prolić ZM, Anđelković M, Savić T. Different responses of Drosophila subobscura isofemale lines to extremely low frequency magnetic field (50Hz, 0.5mT): fitness components and locomotor activity. in International Journal of Radiation Biology. 2017;93(5):544-552.
doi:10.1080/09553002.2017.1268281 .

Zmejkoski, Danica, Petković, Branka, Pavković-Lučić, Sofija, Prolić, Zlatko M., Anđelković, Marko, Savić, Tatjana, "Different responses of Drosophila subobscura isofemale lines to extremely low frequency magnetic field (50Hz, 0.5mT): fitness components and locomotor activity" in International Journal of Radiation Biology, 93, no. 5 (2017):544-552,
https://doi.org/10.1080/09553002.2017.1268281 . .

TY  - JOUR
AU  - Dimitrijevic, Danica
AU  - Savić, Tatjana
AU  - Anđelković, Marko
AU  - Prolić, Zlatko M.
AU  - Janac, Branka
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5985
AB  - Purpose: Extremely low frequency (ELF) magnetic fields are essential ecological factors which may induce changes in many organisms. The aim of this study was to examine the effects in Drosophila subobscura exposed for 48 h to ELF magnetic field (50 Hz, 0.5 mT) at different developmental stages. Materials and methods: Egg-first instar larvae developmental stage of D. subobscura isofemale lines was exposed to ELF magnetic field, and fitness components (developmental time, developmental dynamics, viability and sex ratio) and locomotor activity of three-day-old males and females were monitored. Also, just eclosed D. subobscura isofemale adults were exposed to ELF magnetic field and their locomotor activity was monitored just after. Results: ELF magnetic field shortens developmental time, increases viability and does not affect sex ratio of D. subobscura. No matter which developmental stage is exposed, ELF magnetic field significantly decreases locomotor activity of adult flies, but after exposure of just eclosed adults observed change lasts longer. Conclusions: Applied ELF magnetic field modifies fitness components and locomotor activity of D. subobscura. Observed effects can be attributed to the influence of magnetic field on different stages of development where the hormonal and nervous systems play important role in the control of examined parameters.
T2  - International Journal of Radiation Biology
T1  - Extremely low frequency magnetic field (50 Hz, 0.5 mT) modifies fitness components and locomotor activity of Drosophila subobscura
VL  - 90
IS  - 5
SP  - 337
EP  - 343
DO  - 10.3109/09553002.2014.888105
ER  - 

@article{
author = "Dimitrijevic, Danica and Savić, Tatjana and Anđelković, Marko and Prolić, Zlatko M. and Janac, Branka",
year = "2014",
abstract = "Purpose: Extremely low frequency (ELF) magnetic fields are essential ecological factors which may induce changes in many organisms. The aim of this study was to examine the effects in Drosophila subobscura exposed for 48 h to ELF magnetic field (50 Hz, 0.5 mT) at different developmental stages. Materials and methods: Egg-first instar larvae developmental stage of D. subobscura isofemale lines was exposed to ELF magnetic field, and fitness components (developmental time, developmental dynamics, viability and sex ratio) and locomotor activity of three-day-old males and females were monitored. Also, just eclosed D. subobscura isofemale adults were exposed to ELF magnetic field and their locomotor activity was monitored just after. Results: ELF magnetic field shortens developmental time, increases viability and does not affect sex ratio of D. subobscura. No matter which developmental stage is exposed, ELF magnetic field significantly decreases locomotor activity of adult flies, but after exposure of just eclosed adults observed change lasts longer. Conclusions: Applied ELF magnetic field modifies fitness components and locomotor activity of D. subobscura. Observed effects can be attributed to the influence of magnetic field on different stages of development where the hormonal and nervous systems play important role in the control of examined parameters.",
journal = "International Journal of Radiation Biology",
title = "Extremely low frequency magnetic field (50 Hz, 0.5 mT) modifies fitness components and locomotor activity of Drosophila subobscura",
volume = "90",
number = "5",
pages = "337-343",
doi = "10.3109/09553002.2014.888105"
}

Dimitrijevic, D., Savić, T., Anđelković, M., Prolić, Z. M.,& Janac, B.. (2014). Extremely low frequency magnetic field (50 Hz, 0.5 mT) modifies fitness components and locomotor activity of Drosophila subobscura. in International Journal of Radiation Biology, 90(5), 337-343.
https://doi.org/10.3109/09553002.2014.888105

Dimitrijevic D, Savić T, Anđelković M, Prolić ZM, Janac B. Extremely low frequency magnetic field (50 Hz, 0.5 mT) modifies fitness components and locomotor activity of Drosophila subobscura. in International Journal of Radiation Biology. 2014;90(5):337-343.
doi:10.3109/09553002.2014.888105 .

Dimitrijevic, Danica, Savić, Tatjana, Anđelković, Marko, Prolić, Zlatko M., Janac, Branka, "Extremely low frequency magnetic field (50 Hz, 0.5 mT) modifies fitness components and locomotor activity of Drosophila subobscura" in International Journal of Radiation Biology, 90, no. 5 (2014):337-343,
https://doi.org/10.3109/09553002.2014.888105 . .