TY  - CONF
AU  - Ozyuzer, Lutfi
AU  - Demirhan, Yasemin
AU  - Altan, Hakan
AU  - Ralević, Uroš
AU  - Ozdemir, Mehtap
AU  - Aygun, Gulnur
AU  - Stojanović, Danka B.
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/13048
AB  - There are exceptional advantages in the region where Terahertz (THz) frequency takes place that could be identified as; a non-ionizing bio-innocuous property, transparent characteristics in cardboard or textiles, and extremely discriminating absorption spectral lines which can provide a “genetic code” of various bio-materials. [1,2]. The resonant effects at various terahertz frequencies that were displayed by metamaterials have created to accomplish a very important situation. Metamaterials are virtually desirable platforms for investigating chiral effects.  In order to enhance these effects, producing the tunable chiral devices attracted lots of attention. Among the phase change materials for chiral metamaterials, graphene is a promising candidate due to its astonishing properties specifically in the THz and far infrared region.  In this study, a chiral metamaterial gammadion structure is designed and fabricated on both sides of the sapphire substrates. A commercial COMSOL and CST Microwave Studio programs are used to design and optimize the chiral metamaterial. Numerical simulations are based on the interaction of the chiral structure with linearly and circularly polarized light. In the experimental side, a resistive evaporation and dc magnetron sputtering method is used for the deposition of gold and Sb2Se3 films respectively. A single layer graphene is used, that is grown on a copper foil by chemical vapor deposition. The thin graphene layer transferred on the Sb2Se3 coated sapphire substrates. The conventional UV lithography and ion beam etching techniques are used for patterning process. The THz characterization measurements were performed in order to assess the THz frequency response and to demonstrate the dynamically tunable chiroptical response using optical pumping [3,4]. The active polarization manipulation capability of the Sb2Se3/graphene chiral metamaterial with frequency tunability are investigated both numerically and experimentally.
PB  - Belgrade : Institute of Physics
C3  - 16th Photonics Workshop : Book of abstracts
T1  - Chiral Devices for Terahertz Waves Based on Tunable Metamaterials
SP  - 49
EP  - 49
UR  - https://hdl.handle.net/21.15107/rcub_vinar_13048
ER  - 

@conference{
author = "Ozyuzer, Lutfi and Demirhan, Yasemin and Altan, Hakan and Ralević, Uroš and Ozdemir, Mehtap and Aygun, Gulnur and Stojanović, Danka B.",
year = "2023",
abstract = "There are exceptional advantages in the region where Terahertz (THz) frequency takes place that could be identified as; a non-ionizing bio-innocuous property, transparent characteristics in cardboard or textiles, and extremely discriminating absorption spectral lines which can provide a “genetic code” of various bio-materials. [1,2]. The resonant effects at various terahertz frequencies that were displayed by metamaterials have created to accomplish a very important situation. Metamaterials are virtually desirable platforms for investigating chiral effects.  In order to enhance these effects, producing the tunable chiral devices attracted lots of attention. Among the phase change materials for chiral metamaterials, graphene is a promising candidate due to its astonishing properties specifically in the THz and far infrared region.  In this study, a chiral metamaterial gammadion structure is designed and fabricated on both sides of the sapphire substrates. A commercial COMSOL and CST Microwave Studio programs are used to design and optimize the chiral metamaterial. Numerical simulations are based on the interaction of the chiral structure with linearly and circularly polarized light. In the experimental side, a resistive evaporation and dc magnetron sputtering method is used for the deposition of gold and Sb2Se3 films respectively. A single layer graphene is used, that is grown on a copper foil by chemical vapor deposition. The thin graphene layer transferred on the Sb2Se3 coated sapphire substrates. The conventional UV lithography and ion beam etching techniques are used for patterning process. The THz characterization measurements were performed in order to assess the THz frequency response and to demonstrate the dynamically tunable chiroptical response using optical pumping [3,4]. The active polarization manipulation capability of the Sb2Se3/graphene chiral metamaterial with frequency tunability are investigated both numerically and experimentally.",
publisher = "Belgrade : Institute of Physics",
journal = "16th Photonics Workshop : Book of abstracts",
title = "Chiral Devices for Terahertz Waves Based on Tunable Metamaterials",
pages = "49-49",
url = "https://hdl.handle.net/21.15107/rcub_vinar_13048"
}

Ozyuzer, L., Demirhan, Y., Altan, H., Ralević, U., Ozdemir, M., Aygun, G.,& Stojanović, D. B.. (2023). Chiral Devices for Terahertz Waves Based on Tunable Metamaterials. in 16th Photonics Workshop : Book of abstracts
Belgrade : Institute of Physics., 49-49.
https://hdl.handle.net/21.15107/rcub_vinar_13048

Ozyuzer L, Demirhan Y, Altan H, Ralević U, Ozdemir M, Aygun G, Stojanović DB. Chiral Devices for Terahertz Waves Based on Tunable Metamaterials. in 16th Photonics Workshop : Book of abstracts. 2023;:49-49.
https://hdl.handle.net/21.15107/rcub_vinar_13048 .

Ozyuzer, Lutfi, Demirhan, Yasemin, Altan, Hakan, Ralević, Uroš, Ozdemir, Mehtap, Aygun, Gulnur, Stojanović, Danka B., "Chiral Devices for Terahertz Waves Based on Tunable Metamaterials" in 16th Photonics Workshop : Book of abstracts (2023):49-49,
https://hdl.handle.net/21.15107/rcub_vinar_13048 .

TY  - CONF
AU  - Stojanović, D. B.
AU  - Milošević, V.
AU  - Ralević, Uroš
AU  - Hadžievski, Ljupčo
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10915
AB  - Controlling states of circular polarization with metamaterials [1] enables diverse applications in information processing, spectroscopy and communications. Furthermore, strong modulation of polarization of terahertz (THz) electromagnetic waves can be achieved by integrating active material (such as graphene) with metamaterials [2,3]. The chiral effects can be tuned and metamaterial sensing capabilities can be improved by dynamical modulation of the graphene conductivity. Nowadays, there is a need for rapid and reliable detection of biological samples, especially viruses. The advantage of active metamaterials is precise distinction in between viruses, which is challenging due to their nearly comparable refractive indices. This makes them appropriate for biosensor applications [4,5]. In this work, we numerically investigate THz electromagnetic wave propagation through metamaterial composed of resonant elements based on metallic strips embedded with gated graphene layer. The analysis is provided by calculation of cross- and co-reflection coefficients and efficiency of linear to circular polarization conversion with the change of the Fermi energy of graphene. In addition, the sensitivity of reflection spectra is tested for variations of refractive index, using the data available in the literature for several types of viruses, which is indicative for performance of the proposed metamaterial as a potential biosensor. We expect that proposed structure will enable easier biosensor fabrication with enhanced detection sensitivity compared to previously numerically investigated structures.
PB  - Belgrade : Institute of Physics Belgrade
C3  - PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade
T1  - Active terahertz metamaterial for polarization manipulation and biosensing
SP  - 159
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10915
ER  - 

@conference{
author = "Stojanović, D. B. and Milošević, V. and Ralević, Uroš and Hadžievski, Ljupčo",
year = "2021",
abstract = "Controlling states of circular polarization with metamaterials [1] enables diverse applications in information processing, spectroscopy and communications. Furthermore, strong modulation of polarization of terahertz (THz) electromagnetic waves can be achieved by integrating active material (such as graphene) with metamaterials [2,3]. The chiral effects can be tuned and metamaterial sensing capabilities can be improved by dynamical modulation of the graphene conductivity. Nowadays, there is a need for rapid and reliable detection of biological samples, especially viruses. The advantage of active metamaterials is precise distinction in between viruses, which is challenging due to their nearly comparable refractive indices. This makes them appropriate for biosensor applications [4,5]. In this work, we numerically investigate THz electromagnetic wave propagation through metamaterial composed of resonant elements based on metallic strips embedded with gated graphene layer. The analysis is provided by calculation of cross- and co-reflection coefficients and efficiency of linear to circular polarization conversion with the change of the Fermi energy of graphene. In addition, the sensitivity of reflection spectra is tested for variations of refractive index, using the data available in the literature for several types of viruses, which is indicative for performance of the proposed metamaterial as a potential biosensor. We expect that proposed structure will enable easier biosensor fabrication with enhanced detection sensitivity compared to previously numerically investigated structures.",
publisher = "Belgrade : Institute of Physics Belgrade",
journal = "PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade",
title = "Active terahertz metamaterial for polarization manipulation and biosensing",
pages = "159",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10915"
}

Stojanović, D. B., Milošević, V., Ralević, U.,& Hadžievski, L.. (2021). Active terahertz metamaterial for polarization manipulation and biosensing. in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade
Belgrade : Institute of Physics Belgrade., 159.
https://hdl.handle.net/21.15107/rcub_vinar_10915

Stojanović DB, Milošević V, Ralević U, Hadžievski L. Active terahertz metamaterial for polarization manipulation and biosensing. in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade. 2021;:159.
https://hdl.handle.net/21.15107/rcub_vinar_10915 .

Stojanović, D. B., Milošević, V., Ralević, Uroš, Hadžievski, Ljupčo, "Active terahertz metamaterial for polarization manipulation and biosensing" in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade (2021):159,
https://hdl.handle.net/21.15107/rcub_vinar_10915 .

TY  - CONF
AU  - Milošević, V.
AU  - Ralević, Uroš
AU  - Stojanović, D. B.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10916
AB  - Polarization is an important characteristic of electromagnetic waves and manipulation of polarization plays pivotal role in different areas such as communications, imaging and sensing. On the other hand, the ability to dynamically modify the state of polarization with metamaterials enables control of circular dichroism and optical activity in terahertz frequency range [1,2]. This dynamic control can be realized by incorporating graphene layer into the metasurface, whose conductivity can be controlled by applying gate voltage. In this work, the effect of graphene conductivity on chiral effects of the metasurface will be analyzed using temporal coupled-mode theory [3,4]. In this frame, each resonant mode is characterized with its resonant frequency, radiative and non-radiative coupling coefficients. These parameters will be retrieved from simulated reflection and transmission spectra for left and right circular polarizations. In such way, theoretical model for tunable chiral effects in graphene metasurface will be given, enabling further improvement of its properties.
PB  - Belgrade : Institute of Physics Belgrade
C3  - PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade
T1  - Dependence of loss parameters on circularly polarized terahertz wave propagation through graphene gated metamaterial
SP  - 164
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10916
ER  - 

@conference{
author = "Milošević, V. and Ralević, Uroš and Stojanović, D. B.",
year = "2021",
abstract = "Polarization is an important characteristic of electromagnetic waves and manipulation of polarization plays pivotal role in different areas such as communications, imaging and sensing. On the other hand, the ability to dynamically modify the state of polarization with metamaterials enables control of circular dichroism and optical activity in terahertz frequency range [1,2]. This dynamic control can be realized by incorporating graphene layer into the metasurface, whose conductivity can be controlled by applying gate voltage. In this work, the effect of graphene conductivity on chiral effects of the metasurface will be analyzed using temporal coupled-mode theory [3,4]. In this frame, each resonant mode is characterized with its resonant frequency, radiative and non-radiative coupling coefficients. These parameters will be retrieved from simulated reflection and transmission spectra for left and right circular polarizations. In such way, theoretical model for tunable chiral effects in graphene metasurface will be given, enabling further improvement of its properties.",
publisher = "Belgrade : Institute of Physics Belgrade",
journal = "PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade",
title = "Dependence of loss parameters on circularly polarized terahertz wave propagation through graphene gated metamaterial",
pages = "164",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10916"
}

Milošević, V., Ralević, U.,& Stojanović, D. B.. (2021). Dependence of loss parameters on circularly polarized terahertz wave propagation through graphene gated metamaterial. in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade
Belgrade : Institute of Physics Belgrade., 164.
https://hdl.handle.net/21.15107/rcub_vinar_10916

Milošević V, Ralević U, Stojanović DB. Dependence of loss parameters on circularly polarized terahertz wave propagation through graphene gated metamaterial. in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade. 2021;:164.
https://hdl.handle.net/21.15107/rcub_vinar_10916 .

Milošević, V., Ralević, Uroš, Stojanović, D. B., "Dependence of loss parameters on circularly polarized terahertz wave propagation through graphene gated metamaterial" in PHOTONICA2021 : 8th International School and Conference on Photonics and HEMMAGINERO workshop : Abstracts of Tutorial, Keynote, Invited Lectures, Progress Reports and Contributed Papers; August 23-27, 2021; Belgrade (2021):164,
https://hdl.handle.net/21.15107/rcub_vinar_10916 .

TY  - JOUR
AU  - Laban, Bojana B.
AU  - Ralević, Uroš
AU  - Petrović, Sandra
AU  - Leskovac, Andreja
AU  - Vasić Anićijević, Dragana D.
AU  - Marković, Mirjana
AU  - Vasić, Vesna M.
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8673
AB  - The simple green method for synthesis of stable L-Methionine (L-Met) capped silver (Ag@LM NPs) and gold (Au@LM NPs) nanoparticles (NPs) without adding any additional reduction agent or stabilizer was developed. Colloidal dispersions were characterized by UV–Vis spectrophotometry. The size and spherical shape of NPs were evaluated by transmission electron microscopy. Their surface covering was confirmed by atomic force microscopy, Fourier transform infrared spectroscopy, dynamic light scattering, and zeta potential measurements. Density functional theory calculations pointed that the preferential adsorption mode of L-Met on both Ag and Au surfaces was a vertical binding geometry via –NH2 group, while horizontal binding mode via [sbnd]S[sbnd] and –NH2 groups is also possible. The genotoxicity (evaluated by the micronucleus assay) of NPs, as well as their effects on some oxidative stress parameters (catalase activity, malondialdehyde level), were assessed in vitro using human peripheral blood cells as a model system. The influence of NPs on the morphology of lymphocyte cells studied using atomic force microscopy revealed that the membrane of cells remained unaffected after the treatment with NPs. When considering the effects of NPs on catalase activity and malondialdehyde level, neither particle type promoted oxidative stress. However, the treatment of lymphocytes with Ag@LM NPs induced a concentration-dependent enhancement of the micronuclei incidence and suppression of the cell proliferation while Au@LM NPs promoted cell proliferation, with no significant effects on micronuclei formation. The Ag@LM NPs were more prone to induce DNA damage than Au@LM NPs, which makes the latter type more suitable for further studies in nano-medicine. © 2019
T2  - Journal of Inorganic Biochemistry
T1  - Green synthesis and characterization of nontoxic L-methionine capped silver and gold nanoparticles
VL  - 204
SP  - 110958
DO  - 10.1016/j.jinorgbio.2019.110958
ER  - 

@article{
author = "Laban, Bojana B. and Ralević, Uroš and Petrović, Sandra and Leskovac, Andreja and Vasić Anićijević, Dragana D. and Marković, Mirjana and Vasić, Vesna M.",
year = "2020",
abstract = "The simple green method for synthesis of stable L-Methionine (L-Met) capped silver (Ag@LM NPs) and gold (Au@LM NPs) nanoparticles (NPs) without adding any additional reduction agent or stabilizer was developed. Colloidal dispersions were characterized by UV–Vis spectrophotometry. The size and spherical shape of NPs were evaluated by transmission electron microscopy. Their surface covering was confirmed by atomic force microscopy, Fourier transform infrared spectroscopy, dynamic light scattering, and zeta potential measurements. Density functional theory calculations pointed that the preferential adsorption mode of L-Met on both Ag and Au surfaces was a vertical binding geometry via –NH2 group, while horizontal binding mode via [sbnd]S[sbnd] and –NH2 groups is also possible. The genotoxicity (evaluated by the micronucleus assay) of NPs, as well as their effects on some oxidative stress parameters (catalase activity, malondialdehyde level), were assessed in vitro using human peripheral blood cells as a model system. The influence of NPs on the morphology of lymphocyte cells studied using atomic force microscopy revealed that the membrane of cells remained unaffected after the treatment with NPs. When considering the effects of NPs on catalase activity and malondialdehyde level, neither particle type promoted oxidative stress. However, the treatment of lymphocytes with Ag@LM NPs induced a concentration-dependent enhancement of the micronuclei incidence and suppression of the cell proliferation while Au@LM NPs promoted cell proliferation, with no significant effects on micronuclei formation. The Ag@LM NPs were more prone to induce DNA damage than Au@LM NPs, which makes the latter type more suitable for further studies in nano-medicine. © 2019",
journal = "Journal of Inorganic Biochemistry",
title = "Green synthesis and characterization of nontoxic L-methionine capped silver and gold nanoparticles",
volume = "204",
pages = "110958",
doi = "10.1016/j.jinorgbio.2019.110958"
}

Laban, B. B., Ralević, U., Petrović, S., Leskovac, A., Vasić Anićijević, D. D., Marković, M.,& Vasić, V. M.. (2020). Green synthesis and characterization of nontoxic L-methionine capped silver and gold nanoparticles. in Journal of Inorganic Biochemistry, 204, 110958.
https://doi.org/10.1016/j.jinorgbio.2019.110958

Laban BB, Ralević U, Petrović S, Leskovac A, Vasić Anićijević DD, Marković M, Vasić VM. Green synthesis and characterization of nontoxic L-methionine capped silver and gold nanoparticles. in Journal of Inorganic Biochemistry. 2020;204:110958.
doi:10.1016/j.jinorgbio.2019.110958 .

Laban, Bojana B., Ralević, Uroš, Petrović, Sandra, Leskovac, Andreja, Vasić Anićijević, Dragana D., Marković, Mirjana, Vasić, Vesna M., "Green synthesis and characterization of nontoxic L-methionine capped silver and gold nanoparticles" in Journal of Inorganic Biochemistry, 204 (2020):110958,
https://doi.org/10.1016/j.jinorgbio.2019.110958 . .

TY  - JOUR
AU  - Mitrić, Jelena
AU  - Ralević, Uroš
AU  - Mitrić, Miodrag
AU  - Ćirković, Jovana
AU  - Križan, Gregor
AU  - Romčević, Maja J.
AU  - Gilić, Martina
AU  - Romčević, Nebojša Ž.
PY  - 2019
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8555
AB  - In this paper, we describe synthesis and characterization of YVO 4 and Eu 3+ -doped YVO 4 nanopowders. Two methods of preparation were used—solution combustion synthesis (SCS) and classical ceramic method (CCM)—and compared. Morphology and structure of all samples were characterized with atomic-force microscopy (AFM), X-ray diffraction (XRD), and field-emission scanning electron microscopy (SEM). Raman spectroscopy was used to discuss the isotope-like effect. It is confirmed that doping with Eu ions results in a change of Raman spectra of doped samples—new modes arise, and intensity of existing ones change. Influence of different preparation methods on isotope-like effect is presented with detailed calculations of shifted modes. © 2019 John Wiley & Sons, Ltd.
T2  - Journal of Raman Spectroscopy
T1  - Isotope-like effect in YVO4:Eu3+ nanopowders: Raman spectroscopy
VL  - 50
IS  - 6
SP  - 802
EP  - 808
DO  - 10.1002/jrs.5584
ER  - 

@article{
author = "Mitrić, Jelena and Ralević, Uroš and Mitrić, Miodrag and Ćirković, Jovana and Križan, Gregor and Romčević, Maja J. and Gilić, Martina and Romčević, Nebojša Ž.",
year = "2019",
abstract = "In this paper, we describe synthesis and characterization of YVO 4 and Eu 3+ -doped YVO 4 nanopowders. Two methods of preparation were used—solution combustion synthesis (SCS) and classical ceramic method (CCM)—and compared. Morphology and structure of all samples were characterized with atomic-force microscopy (AFM), X-ray diffraction (XRD), and field-emission scanning electron microscopy (SEM). Raman spectroscopy was used to discuss the isotope-like effect. It is confirmed that doping with Eu ions results in a change of Raman spectra of doped samples—new modes arise, and intensity of existing ones change. Influence of different preparation methods on isotope-like effect is presented with detailed calculations of shifted modes. © 2019 John Wiley & Sons, Ltd.",
journal = "Journal of Raman Spectroscopy",
title = "Isotope-like effect in YVO4:Eu3+ nanopowders: Raman spectroscopy",
volume = "50",
number = "6",
pages = "802-808",
doi = "10.1002/jrs.5584"
}

Mitrić, J., Ralević, U., Mitrić, M., Ćirković, J., Križan, G., Romčević, M. J., Gilić, M.,& Romčević, N. Ž.. (2019). Isotope-like effect in YVO4:Eu3+ nanopowders: Raman spectroscopy. in Journal of Raman Spectroscopy, 50(6), 802-808.
https://doi.org/10.1002/jrs.5584

Mitrić J, Ralević U, Mitrić M, Ćirković J, Križan G, Romčević MJ, Gilić M, Romčević NŽ. Isotope-like effect in YVO4:Eu3+ nanopowders: Raman spectroscopy. in Journal of Raman Spectroscopy. 2019;50(6):802-808.
doi:10.1002/jrs.5584 .

Mitrić, Jelena, Ralević, Uroš, Mitrić, Miodrag, Ćirković, Jovana, Križan, Gregor, Romčević, Maja J., Gilić, Martina, Romčević, Nebojša Ž., "Isotope-like effect in YVO4:Eu3+ nanopowders: Raman spectroscopy" in Journal of Raman Spectroscopy, 50, no. 6 (2019):802-808,
https://doi.org/10.1002/jrs.5584 . .

TY  - JOUR
AU  - Ralević, Uroš
AU  - Isic, Goran
AU  - Vasić Anićijević, Dragana D.
AU  - Laban, Bojana B.
AU  - Bogdanović, Una
AU  - Lazović, Vladimir M.
AU  - Vodnik, Vesna
AU  - Gajic, Rados
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1890
AB  - The adsorption of thiacyanine dye molecules on citrate-stabilized silver nanoparticle clusters drop-cast onto freshly cleaved mica or highly oriented pyrolytic graphite surfaces is examined using colocalized surface-enhanced Raman spectroscopy and atomic force microscopy. The incidence of dye Raman signatures in photoluminescence hotspots identified around nanoparticle clusters is considered for both citrate- and borate-capped silver nanoparticles and found to be substantially lower in the former case, suggesting that the citrate anions impede the efficient dye adsorption. Rigorous numerical simulations of light scattering on random nanoparticle clusters are used for estimating the electromagnetic enhancement and elucidating the hotspot formation mechanism. The majority of the enhanced Raman signal, estimated to be more than 90%, is found to originate from the nanogaps between adjacent nanoparticles in the cluster, regardless of the cluster size and geometry. (C) 2017 Elsevier B.V. All rights reserved.
T2  - Applied Surface Science
T1  - Nanospectroscopy of thiacyanine dye molecules adsorbed on silver nanoparticle clusters
VL  - 434
SP  - 540
EP  - 548
DO  - 10.1016/j.apsusc.2017.10.148
ER  - 

@article{
author = "Ralević, Uroš and Isic, Goran and Vasić Anićijević, Dragana D. and Laban, Bojana B. and Bogdanović, Una and Lazović, Vladimir M. and Vodnik, Vesna and Gajic, Rados",
year = "2018",
abstract = "The adsorption of thiacyanine dye molecules on citrate-stabilized silver nanoparticle clusters drop-cast onto freshly cleaved mica or highly oriented pyrolytic graphite surfaces is examined using colocalized surface-enhanced Raman spectroscopy and atomic force microscopy. The incidence of dye Raman signatures in photoluminescence hotspots identified around nanoparticle clusters is considered for both citrate- and borate-capped silver nanoparticles and found to be substantially lower in the former case, suggesting that the citrate anions impede the efficient dye adsorption. Rigorous numerical simulations of light scattering on random nanoparticle clusters are used for estimating the electromagnetic enhancement and elucidating the hotspot formation mechanism. The majority of the enhanced Raman signal, estimated to be more than 90%, is found to originate from the nanogaps between adjacent nanoparticles in the cluster, regardless of the cluster size and geometry. (C) 2017 Elsevier B.V. All rights reserved.",
journal = "Applied Surface Science",
title = "Nanospectroscopy of thiacyanine dye molecules adsorbed on silver nanoparticle clusters",
volume = "434",
pages = "540-548",
doi = "10.1016/j.apsusc.2017.10.148"
}

Ralević, U., Isic, G., Vasić Anićijević, D. D., Laban, B. B., Bogdanović, U., Lazović, V. M., Vodnik, V.,& Gajic, R.. (2018). Nanospectroscopy of thiacyanine dye molecules adsorbed on silver nanoparticle clusters. in Applied Surface Science, 434, 540-548.
https://doi.org/10.1016/j.apsusc.2017.10.148

Ralević U, Isic G, Vasić Anićijević DD, Laban BB, Bogdanović U, Lazović VM, Vodnik V, Gajic R. Nanospectroscopy of thiacyanine dye molecules adsorbed on silver nanoparticle clusters. in Applied Surface Science. 2018;434:540-548.
doi:10.1016/j.apsusc.2017.10.148 .

Ralević, Uroš, Isic, Goran, Vasić Anićijević, Dragana D., Laban, Bojana B., Bogdanović, Una, Lazović, Vladimir M., Vodnik, Vesna, Gajic, Rados, "Nanospectroscopy of thiacyanine dye molecules adsorbed on silver nanoparticle clusters" in Applied Surface Science, 434 (2018):540-548,
https://doi.org/10.1016/j.apsusc.2017.10.148 . .

TY  - JOUR
AU  - Mitrić, Jelena
AU  - Paunović, Novica M.
AU  - Mitrić, Miodrag
AU  - Vasić, Borislav Z.
AU  - Ralević, Uroš
AU  - Trajić, Jelena
AU  - Romčević, Maja J.
AU  - Dobrowolski, Witold D.
AU  - Yahia, Ibrahim S.
AU  - Romčević, Nebojša Ž.
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7808
AB  - Structural and optical properties of CdTe thin films were investigated applying atomic force microscopy (AFM), XRD powder technique, Raman spectroscopy and far–infrared spectroscopy. CdTe thin films were prepared by using thermal evaporation technique. In the analysis of the far – infrared reflection spectra, numerical model for calculating the reflectivity coefficient for system which includes films and substrate has been applied. Effective permittivity of film mixture (CdTe and air) was modeled by Maxwell – Garnet approximation. We reveal the existence of surface optical phonon (SOP) mode and coupled plasmon-SOP modes (CPSOPM). © 2018 Elsevier B.V.
T2  - Physica E: Low-dimensional Systems and Nanostructures
T1  - Surface optical phonon – Plasmon interaction in nanodimensional CdTe thin films
VL  - 104
SP  - 64
EP  - 70
DO  - 10.1016/j.physe.2018.07.021
ER  - 

@article{
author = "Mitrić, Jelena and Paunović, Novica M. and Mitrić, Miodrag and Vasić, Borislav Z. and Ralević, Uroš and Trajić, Jelena and Romčević, Maja J. and Dobrowolski, Witold D. and Yahia, Ibrahim S. and Romčević, Nebojša Ž.",
year = "2018",
abstract = "Structural and optical properties of CdTe thin films were investigated applying atomic force microscopy (AFM), XRD powder technique, Raman spectroscopy and far–infrared spectroscopy. CdTe thin films were prepared by using thermal evaporation technique. In the analysis of the far – infrared reflection spectra, numerical model for calculating the reflectivity coefficient for system which includes films and substrate has been applied. Effective permittivity of film mixture (CdTe and air) was modeled by Maxwell – Garnet approximation. We reveal the existence of surface optical phonon (SOP) mode and coupled plasmon-SOP modes (CPSOPM). © 2018 Elsevier B.V.",
journal = "Physica E: Low-dimensional Systems and Nanostructures",
title = "Surface optical phonon – Plasmon interaction in nanodimensional CdTe thin films",
volume = "104",
pages = "64-70",
doi = "10.1016/j.physe.2018.07.021"
}

Mitrić, J., Paunović, N. M., Mitrić, M., Vasić, B. Z., Ralević, U., Trajić, J., Romčević, M. J., Dobrowolski, W. D., Yahia, I. S.,& Romčević, N. Ž.. (2018). Surface optical phonon – Plasmon interaction in nanodimensional CdTe thin films. in Physica E: Low-dimensional Systems and Nanostructures, 104, 64-70.
https://doi.org/10.1016/j.physe.2018.07.021

Mitrić J, Paunović NM, Mitrić M, Vasić BZ, Ralević U, Trajić J, Romčević MJ, Dobrowolski WD, Yahia IS, Romčević NŽ. Surface optical phonon – Plasmon interaction in nanodimensional CdTe thin films. in Physica E: Low-dimensional Systems and Nanostructures. 2018;104:64-70.
doi:10.1016/j.physe.2018.07.021 .

Mitrić, Jelena, Paunović, Novica M., Mitrić, Miodrag, Vasić, Borislav Z., Ralević, Uroš, Trajić, Jelena, Romčević, Maja J., Dobrowolski, Witold D., Yahia, Ibrahim S., Romčević, Nebojša Ž., "Surface optical phonon – Plasmon interaction in nanodimensional CdTe thin films" in Physica E: Low-dimensional Systems and Nanostructures, 104 (2018):64-70,
https://doi.org/10.1016/j.physe.2018.07.021 . .

TY  - CONF
AU  - Gilić, Martina
AU  - Ćurčić, Milica
AU  - Ćirković, Jovana
AU  - Ralević, Uroš
AU  - Mitrić, Miodrag
AU  - Barudžija, Tanja
AU  - Savić-Šević, Svetlana
AU  - Romčević, Nebojša Ž.
AU  - Yahia, Ibrahim
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10888
AB  - Thin films of Se-CuSe2  of three different thicknesses have been prepared by vacuum evaporation method on a glass substrate at room temperature. Surface morphology was investigated by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The structural characterization of thin film was investigated using Xray diffraction pattern (XRD). The presence of twophase system is observed. One is the solid solution of Cu in Se and the other is lowpressure modification of CuSe2 . The optical properties of the films were investigated by photoluminescence spectroscopy and UV-VIS spectroscopy. CuSe2  exhibits both direct and indirect transitions. According to UV-VIS measurements, the band gap for direct transition is found to be in the range of 2.72–2.75 eV and that for indirect transition is in the range of 1.71–1.75 eV. On the other hand, selenium exhibits direct band gap in the range 2.33-2.36 eV. All estimated band gaps slightly decrease with the increase of the film thickness. Photoluminescence spectra of thin films show emission peaks at about 1.6 and 2.3 eV nm at room temperature, with no observed shift with decreasing temperature. A model is proposed for explaining such anomaly
PB  - Belgrade : Serbian Ceramic Society
C3  - Advanced Ceramics and Application : 5th Serbian Ceramic Society Conference : program and the book of abstracts; September 21-23, 2016; Belgrade
T1  - Optical and structural characterization of Se – CuSe2  thin films
SP  - 65
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10888
ER  - 

@conference{
author = "Gilić, Martina and Ćurčić, Milica and Ćirković, Jovana and Ralević, Uroš and Mitrić, Miodrag and Barudžija, Tanja and Savić-Šević, Svetlana and Romčević, Nebojša Ž. and Yahia, Ibrahim",
year = "2017",
abstract = "Thin films of Se-CuSe2  of three different thicknesses have been prepared by vacuum evaporation method on a glass substrate at room temperature. Surface morphology was investigated by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The structural characterization of thin film was investigated using Xray diffraction pattern (XRD). The presence of twophase system is observed. One is the solid solution of Cu in Se and the other is lowpressure modification of CuSe2 . The optical properties of the films were investigated by photoluminescence spectroscopy and UV-VIS spectroscopy. CuSe2  exhibits both direct and indirect transitions. According to UV-VIS measurements, the band gap for direct transition is found to be in the range of 2.72–2.75 eV and that for indirect transition is in the range of 1.71–1.75 eV. On the other hand, selenium exhibits direct band gap in the range 2.33-2.36 eV. All estimated band gaps slightly decrease with the increase of the film thickness. Photoluminescence spectra of thin films show emission peaks at about 1.6 and 2.3 eV nm at room temperature, with no observed shift with decreasing temperature. A model is proposed for explaining such anomaly",
publisher = "Belgrade : Serbian Ceramic Society",
journal = "Advanced Ceramics and Application : 5th Serbian Ceramic Society Conference : program and the book of abstracts; September 21-23, 2016; Belgrade",
title = "Optical and structural characterization of Se – CuSe2  thin films",
pages = "65",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10888"
}

Gilić, M., Ćurčić, M., Ćirković, J., Ralević, U., Mitrić, M., Barudžija, T., Savić-Šević, S., Romčević, N. Ž.,& Yahia, I.. (2017). Optical and structural characterization of Se – CuSe2  thin films. in Advanced Ceramics and Application : 5th Serbian Ceramic Society Conference : program and the book of abstracts; September 21-23, 2016; Belgrade
Belgrade : Serbian Ceramic Society., 65.
https://hdl.handle.net/21.15107/rcub_vinar_10888

Gilić M, Ćurčić M, Ćirković J, Ralević U, Mitrić M, Barudžija T, Savić-Šević S, Romčević NŽ, Yahia I. Optical and structural characterization of Se – CuSe2  thin films. in Advanced Ceramics and Application : 5th Serbian Ceramic Society Conference : program and the book of abstracts; September 21-23, 2016; Belgrade. 2017;:65.
https://hdl.handle.net/21.15107/rcub_vinar_10888 .

Gilić, Martina, Ćurčić, Milica, Ćirković, Jovana, Ralević, Uroš, Mitrić, Miodrag, Barudžija, Tanja, Savić-Šević, Svetlana, Romčević, Nebojša Ž., Yahia, Ibrahim, "Optical and structural characterization of Se – CuSe2  thin films" in Advanced Ceramics and Application : 5th Serbian Ceramic Society Conference : program and the book of abstracts; September 21-23, 2016; Belgrade (2017):65,
https://hdl.handle.net/21.15107/rcub_vinar_10888 .

TY  - JOUR
AU  - Gilić, Martina D.
AU  - Petrović, Milica S.
AU  - Kostić, Radmila
AU  - Stojanović, Dušanka
AU  - Barudžija, Tanja
AU  - Mitrić, Miodrag
AU  - Romčević, Nebojša Ž.
AU  - Ralević, Uroš
AU  - Trajić, Jelena
AU  - Romčević, Maja J.
AU  - Yahia, Ibrahim S.
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1116
AB  - This paper describes the structural and optical properties of Cu-Se thin films. The surface morphology of thin films was investigated by atomic force microscopy (AFM) and scanning electron microscopy (SEM). Formation of Cu-Se thin films is concluded to proceed unevenly, in the form of islands which later grew into agglomerates. The structural characterization of Cu-Se thin film was investigated using X-ray diffraction pattern (XRD). The presence of two-phase system is observed. One is the solid solution of Cu in Se and the other is low-pressure modification of CuSe2. The Raman spectroscopy was used to identify and quantify the individual phases present in the Cu-Se films. Red shift and asymmetry of Raman mode characteristic for CuSe2 enable us to estimate nanocrystal dimension. In the analysis of the far infrared reflection spectra, numerical model for calculating the reflectivity coefficient of layered system, which includes film with nanocrystalite inclusions (modeled by Maxwell -Garnett approximation) and substrate, has been applied. (C) 2016 Elsevier B.V. All rights reserved.
T2  - Infrared Physics and Technology
T1  - Structural and optical properties of CuSe2 nanocrystals formed in thin solid Cu-Se film
VL  - 76
SP  - 276
EP  - 284
DO  - 10.1016/j.infrared.2016.03.008
ER  - 

@article{
author = "Gilić, Martina D. and Petrović, Milica S. and Kostić, Radmila and Stojanović, Dušanka and Barudžija, Tanja and Mitrić, Miodrag and Romčević, Nebojša Ž. and Ralević, Uroš and Trajić, Jelena and Romčević, Maja J. and Yahia, Ibrahim S.",
year = "2016",
abstract = "This paper describes the structural and optical properties of Cu-Se thin films. The surface morphology of thin films was investigated by atomic force microscopy (AFM) and scanning electron microscopy (SEM). Formation of Cu-Se thin films is concluded to proceed unevenly, in the form of islands which later grew into agglomerates. The structural characterization of Cu-Se thin film was investigated using X-ray diffraction pattern (XRD). The presence of two-phase system is observed. One is the solid solution of Cu in Se and the other is low-pressure modification of CuSe2. The Raman spectroscopy was used to identify and quantify the individual phases present in the Cu-Se films. Red shift and asymmetry of Raman mode characteristic for CuSe2 enable us to estimate nanocrystal dimension. In the analysis of the far infrared reflection spectra, numerical model for calculating the reflectivity coefficient of layered system, which includes film with nanocrystalite inclusions (modeled by Maxwell -Garnett approximation) and substrate, has been applied. (C) 2016 Elsevier B.V. All rights reserved.",
journal = "Infrared Physics and Technology",
title = "Structural and optical properties of CuSe2 nanocrystals formed in thin solid Cu-Se film",
volume = "76",
pages = "276-284",
doi = "10.1016/j.infrared.2016.03.008"
}

Gilić, M. D., Petrović, M. S., Kostić, R., Stojanović, D., Barudžija, T., Mitrić, M., Romčević, N. Ž., Ralević, U., Trajić, J., Romčević, M. J.,& Yahia, I. S.. (2016). Structural and optical properties of CuSe2 nanocrystals formed in thin solid Cu-Se film. in Infrared Physics and Technology, 76, 276-284.
https://doi.org/10.1016/j.infrared.2016.03.008

Gilić MD, Petrović MS, Kostić R, Stojanović D, Barudžija T, Mitrić M, Romčević NŽ, Ralević U, Trajić J, Romčević MJ, Yahia IS. Structural and optical properties of CuSe2 nanocrystals formed in thin solid Cu-Se film. in Infrared Physics and Technology. 2016;76:276-284.
doi:10.1016/j.infrared.2016.03.008 .

Gilić, Martina D., Petrović, Milica S., Kostić, Radmila, Stojanović, Dušanka, Barudžija, Tanja, Mitrić, Miodrag, Romčević, Nebojša Ž., Ralević, Uroš, Trajić, Jelena, Romčević, Maja J., Yahia, Ibrahim S., "Structural and optical properties of CuSe2 nanocrystals formed in thin solid Cu-Se film" in Infrared Physics and Technology, 76 (2016):276-284,
https://doi.org/10.1016/j.infrared.2016.03.008 . .

TY  - CONF
AU  - Ralević, Uroš
AU  - Isić, Goran
AU  - Laban, Bojana
AU  - Vodnik, Vesna
AU  - Vasić, Vesna
AU  - Gajić, Radoš
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12006
AB  - Dye-coated colloidal metal nanoparticles (NPs) exhibit interesting optical properties originating from the interaction between metal core and dye shell. Depending on the interaction mechanism between the two, optical properties of dyes or NPs can be changed separately or jointly within the dye-NP assembly [1]. Many of the recent studies are focused on dyes which are able to self-assemble in highly oriented structures called Jaggregates on the surface of metallic NPs [2,3]. Owing to the variety of mechanisms by which dyes and their J-aggregates can interact with metallic NPs, dye-NP assemblies can lead to applications ranging from nanoscale sensing [4] to advanced composite materials for novel active and nonlinear optical devices [5]. Here we study the influence of TC concentration on its J-aggregation on the surface of AgNPs assemblies using Raman mapping and atomic force microscopy (AFM). Aqueous solutions (colloids) of citrate stabilized AgNPs with an average diameter of ~10 nm are mixed with TC dye solution and then deposited onto freshly cleaved highly oriented pyrolytic graphite and mica surfaces. The spectral signature of citrate ions is identified by (i) the O-H band around 220 cm-1, (ii) the C-H band around 2950 cm-1 and (iii) pronounced blinking in the 1000-1800 cm-1 range. In contrast, dye molecules adsorbed on nanoparticles are recognized by several stable Raman bands between 200 and 1600 cm-1. In situ AFM measurements show that SERS 'hot spots' are formed either on large single nanoparticles (diameter > 100 nm) or within assemblies of small nanoparticles (with diameters in the 10 - 50 nm range). However, only the latter are found to yield a citrate or TC dye SERS signal. We find that the TC dye adsorbed on the surface of AgNP nanoassemblies always forms J-aggregates when the dye concentration in the TC-AgNP solution is varied between 0.5μM and 17μM. Even though, a clear SERS spectra of dye Jaggregates can be acquired for high dye concentration (17μM) the citrate ions always exist on the AgNP surface and so does their SERS signature in form of O-H (220 cm-1) and C-H (2960 cm-1) bands. Assemblies with low TC concentration (0.5μM) do not have a clear dye SERS spectra, but rather spectra similar to the one of citrate ions meaning that either not all AgNPs are dye coated, or rather that the amount of TC molecules adsorbed on the surface of the nanoparticle is small and hence not detectable. We are grateful to the Serbian Ministry of Education, Science and Technological Development for financial support through projects Nos. OI 171005, OI 172023. This work was performed in the context of the European COST Action MP1302 Nanospectroscopy.
PB  - Belgrade : Vinča Institute of Nuclear Sciences
C3  - PHOTONICA2015 : 5th International School and Conference on Photonics and COST actions: MP1204, BM1205 and MP1205 : book of abstracts; August 24-28, 2015; Belgrade
T1  - Surface enhanced Raman spectroscopy of thiacyanine dye J-aggregates on single silver nanoaggregates
SP  - 97
EP  - 98
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12006
ER  - 

@conference{
author = "Ralević, Uroš and Isić, Goran and Laban, Bojana and Vodnik, Vesna and Vasić, Vesna and Gajić, Radoš",
year = "2015",
abstract = "Dye-coated colloidal metal nanoparticles (NPs) exhibit interesting optical properties originating from the interaction between metal core and dye shell. Depending on the interaction mechanism between the two, optical properties of dyes or NPs can be changed separately or jointly within the dye-NP assembly [1]. Many of the recent studies are focused on dyes which are able to self-assemble in highly oriented structures called Jaggregates on the surface of metallic NPs [2,3]. Owing to the variety of mechanisms by which dyes and their J-aggregates can interact with metallic NPs, dye-NP assemblies can lead to applications ranging from nanoscale sensing [4] to advanced composite materials for novel active and nonlinear optical devices [5]. Here we study the influence of TC concentration on its J-aggregation on the surface of AgNPs assemblies using Raman mapping and atomic force microscopy (AFM). Aqueous solutions (colloids) of citrate stabilized AgNPs with an average diameter of ~10 nm are mixed with TC dye solution and then deposited onto freshly cleaved highly oriented pyrolytic graphite and mica surfaces. The spectral signature of citrate ions is identified by (i) the O-H band around 220 cm-1, (ii) the C-H band around 2950 cm-1 and (iii) pronounced blinking in the 1000-1800 cm-1 range. In contrast, dye molecules adsorbed on nanoparticles are recognized by several stable Raman bands between 200 and 1600 cm-1. In situ AFM measurements show that SERS 'hot spots' are formed either on large single nanoparticles (diameter > 100 nm) or within assemblies of small nanoparticles (with diameters in the 10 - 50 nm range). However, only the latter are found to yield a citrate or TC dye SERS signal. We find that the TC dye adsorbed on the surface of AgNP nanoassemblies always forms J-aggregates when the dye concentration in the TC-AgNP solution is varied between 0.5μM and 17μM. Even though, a clear SERS spectra of dye Jaggregates can be acquired for high dye concentration (17μM) the citrate ions always exist on the AgNP surface and so does their SERS signature in form of O-H (220 cm-1) and C-H (2960 cm-1) bands. Assemblies with low TC concentration (0.5μM) do not have a clear dye SERS spectra, but rather spectra similar to the one of citrate ions meaning that either not all AgNPs are dye coated, or rather that the amount of TC molecules adsorbed on the surface of the nanoparticle is small and hence not detectable. We are grateful to the Serbian Ministry of Education, Science and Technological Development for financial support through projects Nos. OI 171005, OI 172023. This work was performed in the context of the European COST Action MP1302 Nanospectroscopy.",
publisher = "Belgrade : Vinča Institute of Nuclear Sciences",
journal = "PHOTONICA2015 : 5th International School and Conference on Photonics and COST actions: MP1204, BM1205 and MP1205 : book of abstracts; August 24-28, 2015; Belgrade",
title = "Surface enhanced Raman spectroscopy of thiacyanine dye J-aggregates on single silver nanoaggregates",
pages = "97-98",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12006"
}

Ralević, U., Isić, G., Laban, B., Vodnik, V., Vasić, V.,& Gajić, R.. (2015). Surface enhanced Raman spectroscopy of thiacyanine dye J-aggregates on single silver nanoaggregates. in PHOTONICA2015 : 5th International School and Conference on Photonics and COST actions: MP1204, BM1205 and MP1205 : book of abstracts; August 24-28, 2015; Belgrade
Belgrade : Vinča Institute of Nuclear Sciences., 97-98.
https://hdl.handle.net/21.15107/rcub_vinar_12006

Ralević U, Isić G, Laban B, Vodnik V, Vasić V, Gajić R. Surface enhanced Raman spectroscopy of thiacyanine dye J-aggregates on single silver nanoaggregates. in PHOTONICA2015 : 5th International School and Conference on Photonics and COST actions: MP1204, BM1205 and MP1205 : book of abstracts; August 24-28, 2015; Belgrade. 2015;:97-98.
https://hdl.handle.net/21.15107/rcub_vinar_12006 .

Ralević, Uroš, Isić, Goran, Laban, Bojana, Vodnik, Vesna, Vasić, Vesna, Gajić, Radoš, "Surface enhanced Raman spectroscopy of thiacyanine dye J-aggregates on single silver nanoaggregates" in PHOTONICA2015 : 5th International School and Conference on Photonics and COST actions: MP1204, BM1205 and MP1205 : book of abstracts; August 24-28, 2015; Belgrade (2015):97-98,
https://hdl.handle.net/21.15107/rcub_vinar_12006 .

TY  - JOUR
AU  - Stojanović, Danka
AU  - Matkovic, A.
AU  - Askrabic, S.
AU  - Beltaos, A.
AU  - Ralević, Uroš
AU  - Jovanović, Đorđe
AU  - Bajuk-Bogdanović, Danica V.
AU  - Holclajtner-Antunović, Ivanka D.
AU  - Gajic, R.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7017
AB  - In this study, graphene samples prepared by mechanical exfoliation were examined by Raman spectroscopy. The Au electrical contacts, fabricated using photolithography, allowed the application of a gate voltage between graphene and the Si substrate. In the Raman spectra of the sample, we observed shifts of position, changes of intensity and the width variations of the G and 2D peaks with the change of the gate voltage. Spatial Raman mapping of the samples was performed showing variations in intensities of the Raman peaks in different flake regions.
T2  - Physica Scripta
T1  - Raman spectroscopy of graphene: doping and mapping
VL  - T157
DO  - 10.1088/0031-8949/2013/T157/014010
ER  - 

@article{
author = "Stojanović, Danka and Matkovic, A. and Askrabic, S. and Beltaos, A. and Ralević, Uroš and Jovanović, Đorđe and Bajuk-Bogdanović, Danica V. and Holclajtner-Antunović, Ivanka D. and Gajic, R.",
year = "2013",
abstract = "In this study, graphene samples prepared by mechanical exfoliation were examined by Raman spectroscopy. The Au electrical contacts, fabricated using photolithography, allowed the application of a gate voltage between graphene and the Si substrate. In the Raman spectra of the sample, we observed shifts of position, changes of intensity and the width variations of the G and 2D peaks with the change of the gate voltage. Spatial Raman mapping of the samples was performed showing variations in intensities of the Raman peaks in different flake regions.",
journal = "Physica Scripta",
title = "Raman spectroscopy of graphene: doping and mapping",
volume = "T157",
doi = "10.1088/0031-8949/2013/T157/014010"
}

Stojanović, D., Matkovic, A., Askrabic, S., Beltaos, A., Ralević, U., Jovanović, Đ., Bajuk-Bogdanović, D. V., Holclajtner-Antunović, I. D.,& Gajic, R.. (2013). Raman spectroscopy of graphene: doping and mapping. in Physica Scripta, T157.
https://doi.org/10.1088/0031-8949/2013/T157/014010

Stojanović D, Matkovic A, Askrabic S, Beltaos A, Ralević U, Jovanović Đ, Bajuk-Bogdanović DV, Holclajtner-Antunović ID, Gajic R. Raman spectroscopy of graphene: doping and mapping. in Physica Scripta. 2013;T157.
doi:10.1088/0031-8949/2013/T157/014010 .

Stojanović, Danka, Matkovic, A., Askrabic, S., Beltaos, A., Ralević, Uroš, Jovanović, Đorđe, Bajuk-Bogdanović, Danica V., Holclajtner-Antunović, Ivanka D., Gajic, R., "Raman spectroscopy of graphene: doping and mapping" in Physica Scripta, T157 (2013),
https://doi.org/10.1088/0031-8949/2013/T157/014010 . .