TY  - CONF
AU  - Isić, G.
AU  - Ralević, U.
AU  - Aškrabić, S.
AU  - Laban, B.
AU  - Vodnik, Vesna
AU  - Vasić, Vesna
AU  - Gajić, R.
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12539
AB  - Silver nanoparticles (AgNPs) capped with dye molecules and their J-aggregates often have remarkable optical properties that can lead to applications ranging from nanoscale sensing, light harvestering and bio-labelling to advanced composite materials for novel active and nonlinear optical devices. Here we investigate the J-aggregation of a thiacyanine dye (TC) on the surface of citrate capped AgNP nanoasseblies in which the average diameter of individual AgNPs is around 10 nm. Combining Raman mapping, surface-enhanced Raman spectroscopy (SERS) and atomic force microscopy (AFM), we study the influence of TC concentration on its J-aggregation on AgNPs surface. The TC – AgNPs assemblies were 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 2960 cm-1 and (iii) pronounced blinking in the 1000-1800 cm-1 range. In contrast, dye molecules adsorbed on the nanoparticles are recognized by several stable Raman bands between 200 and 1600 cm-1. In situ AFM measurements indicate that the 'hot spots' are formed either on large single nanoparticles (diameter > 100 nm) or within aggregates 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. Our study indicates that even in highly concentrated dye solutions, some citrate ions remain attached to the nanoparticles.
C3  - 2nd Optical Nanospectroscopy Conference : Conference book
T1  - Study of thiacyanine dye J-aggregates on single silver nanoparticle assemblies by surface enhanced Raman scattering and atomic force microscopy
SP  - 37
EP  - 37
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12539
ER  - 

@conference{
author = "Isić, G. and Ralević, U. and Aškrabić, S. and Laban, B. and Vodnik, Vesna and Vasić, Vesna and Gajić, R.",
year = "2015",
abstract = "Silver nanoparticles (AgNPs) capped with dye molecules and their J-aggregates often have remarkable optical properties that can lead to applications ranging from nanoscale sensing, light harvestering and bio-labelling to advanced composite materials for novel active and nonlinear optical devices. Here we investigate the J-aggregation of a thiacyanine dye (TC) on the surface of citrate capped AgNP nanoasseblies in which the average diameter of individual AgNPs is around 10 nm. Combining Raman mapping, surface-enhanced Raman spectroscopy (SERS) and atomic force microscopy (AFM), we study the influence of TC concentration on its J-aggregation on AgNPs surface. The TC – AgNPs assemblies were 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 2960 cm-1 and (iii) pronounced blinking in the 1000-1800 cm-1 range. In contrast, dye molecules adsorbed on the nanoparticles are recognized by several stable Raman bands between 200 and 1600 cm-1. In situ AFM measurements indicate that the 'hot spots' are formed either on large single nanoparticles (diameter > 100 nm) or within aggregates 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. Our study indicates that even in highly concentrated dye solutions, some citrate ions remain attached to the nanoparticles.",
journal = "2nd Optical Nanospectroscopy Conference : Conference book",
title = "Study of thiacyanine dye J-aggregates on single silver nanoparticle assemblies by surface enhanced Raman scattering and atomic force microscopy",
pages = "37-37",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12539"
}

Isić, G., Ralević, U., Aškrabić, S., Laban, B., Vodnik, V., Vasić, V.,& Gajić, R.. (2015). Study of thiacyanine dye J-aggregates on single silver nanoparticle assemblies by surface enhanced Raman scattering and atomic force microscopy. in 2nd Optical Nanospectroscopy Conference : Conference book, 37-37.
https://hdl.handle.net/21.15107/rcub_vinar_12539

Isić G, Ralević U, Aškrabić S, Laban B, Vodnik V, Vasić V, Gajić R. Study of thiacyanine dye J-aggregates on single silver nanoparticle assemblies by surface enhanced Raman scattering and atomic force microscopy. in 2nd Optical Nanospectroscopy Conference : Conference book. 2015;:37-37.
https://hdl.handle.net/21.15107/rcub_vinar_12539 .

Isić, G., Ralević, U., Aškrabić, S., Laban, B., Vodnik, Vesna, Vasić, Vesna, Gajić, R., "Study of thiacyanine dye J-aggregates on single silver nanoparticle assemblies by surface enhanced Raman scattering and atomic force microscopy" in 2nd Optical Nanospectroscopy Conference : Conference book (2015):37-37,
https://hdl.handle.net/21.15107/rcub_vinar_12539 .