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  - Kovačević, Aleksander
AU  - Petrović, Suzana
AU  - Bokic, Bojana
AU  - Gaković, Biljana M.
AU  - Bokorov, Milos T.
AU  - Vasić, Borislav Z.
AU  - Gajic, Rados
AU  - Trtica, Milan
AU  - Jelenković, Branislav
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/323
AB  - The effects of UV femtosecond laser beam with 76 MHz repetition rate on two types of thin films on Si substrate - the Al single layer thin film, and the multilayered thin film consisted of five Al/Ti bilayers (total thickness 130 nm) - were studied. The surface modification of the target was done by low fluences and different irradiation times, not exceeding similar to 300s. Nanopatterns in the form of femtosecond-laser induced periodic surface structures (fs-LIPSS) with periodicity of LT 315 nm and height of 45 nm were registered upon irradiation of the thin films. It was shown that: (i) the fs-LIPSS evolve from ruffles similar to high spatial frequency LIPSS (HSFL) into a low spatial frequency LIPSS (LSFL) if a certain threshold of the fluence is met, (ii) the number of LSFL increases with the exposition time and (iii) the LSFL remain stable even after long exposure times. We achieved high-quality highly-controllable fabrication of periodic structures on the surface of nanosized multilayer films with high-repetition-rate low-fluence femtosecond laser pulses. Compared to the Al single layer, the presence of the Ti underlayer in the Al/Ti multilayer thin film enabled more efficient heat transmittance through the Al/Ti interface away from the interaction zone which caused the reduction of the ablation effects leading to the formation of more regular LIPSS. The different outcomes of interactions with multi and single layer thin films lead to the conclusion that the behavior of the LIPSS is due to thin film structure. (C) 2014 Elsevier B.V. All rights reserved.
T2  - Applied Surface Science
T1  - Surface nanopatterning of Al/Ti multilayer thin films and Al single layer by a low-fluence UV femtosecond laser beam
VL  - 326
SP  - 91
EP  - 98
DO  - 10.1016/j.apsusc.2014.10.180
ER  - 

@article{
author = "Kovačević, Aleksander and Petrović, Suzana and Bokic, Bojana and Gaković, Biljana M. and Bokorov, Milos T. and Vasić, Borislav Z. and Gajic, Rados and Trtica, Milan and Jelenković, Branislav",
year = "2015",
abstract = "The effects of UV femtosecond laser beam with 76 MHz repetition rate on two types of thin films on Si substrate - the Al single layer thin film, and the multilayered thin film consisted of five Al/Ti bilayers (total thickness 130 nm) - were studied. The surface modification of the target was done by low fluences and different irradiation times, not exceeding similar to 300s. Nanopatterns in the form of femtosecond-laser induced periodic surface structures (fs-LIPSS) with periodicity of LT 315 nm and height of 45 nm were registered upon irradiation of the thin films. It was shown that: (i) the fs-LIPSS evolve from ruffles similar to high spatial frequency LIPSS (HSFL) into a low spatial frequency LIPSS (LSFL) if a certain threshold of the fluence is met, (ii) the number of LSFL increases with the exposition time and (iii) the LSFL remain stable even after long exposure times. We achieved high-quality highly-controllable fabrication of periodic structures on the surface of nanosized multilayer films with high-repetition-rate low-fluence femtosecond laser pulses. Compared to the Al single layer, the presence of the Ti underlayer in the Al/Ti multilayer thin film enabled more efficient heat transmittance through the Al/Ti interface away from the interaction zone which caused the reduction of the ablation effects leading to the formation of more regular LIPSS. The different outcomes of interactions with multi and single layer thin films lead to the conclusion that the behavior of the LIPSS is due to thin film structure. (C) 2014 Elsevier B.V. All rights reserved.",
journal = "Applied Surface Science",
title = "Surface nanopatterning of Al/Ti multilayer thin films and Al single layer by a low-fluence UV femtosecond laser beam",
volume = "326",
pages = "91-98",
doi = "10.1016/j.apsusc.2014.10.180"
}

Kovačević, A., Petrović, S., Bokic, B., Gaković, B. M., Bokorov, M. T., Vasić, B. Z., Gajic, R., Trtica, M.,& Jelenković, B.. (2015). Surface nanopatterning of Al/Ti multilayer thin films and Al single layer by a low-fluence UV femtosecond laser beam. in Applied Surface Science, 326, 91-98.
https://doi.org/10.1016/j.apsusc.2014.10.180

Kovačević A, Petrović S, Bokic B, Gaković BM, Bokorov MT, Vasić BZ, Gajic R, Trtica M, Jelenković B. Surface nanopatterning of Al/Ti multilayer thin films and Al single layer by a low-fluence UV femtosecond laser beam. in Applied Surface Science. 2015;326:91-98.
doi:10.1016/j.apsusc.2014.10.180 .

Kovačević, Aleksander, Petrović, Suzana, Bokic, Bojana, Gaković, Biljana M., Bokorov, Milos T., Vasić, Borislav Z., Gajic, Rados, Trtica, Milan, Jelenković, Branislav, "Surface nanopatterning of Al/Ti multilayer thin films and Al single layer by a low-fluence UV femtosecond laser beam" in Applied Surface Science, 326 (2015):91-98,
https://doi.org/10.1016/j.apsusc.2014.10.180 . .