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Spectroscopic investigations on metallo-dielectric Gold@silica composites

DSpace at IIT Bombay

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Title Spectroscopic investigations on metallo-dielectric Gold@silica composites
 
Creator SHARMA, A
DHIMAN, N
SINGH, BP
GATHANIA, AK
 
Subject Metallo-dielectric
Composites
Surface plasmon resonance
Photonic band gap
Photoluminescence
CORE-SHELL NANOPARTICLES
OPTICAL-PROPERTIES
PLASMON RESONANCE
ENHANCEMENT
LUMINESCENCE
DEPENDENCE
PARTICLES
SURFACES
NANORODS
CLUSTERS
 
Description Optical properties of metallo-dielectric (Gold@silica) composites were measured using different characterizing techniques viz. UV-Visible and photoluminescence (PL) spectroscopy. Reflection spectra showed the Bragg reflection peak shifted to longer wavelength and was broadened with the shell growth. The PL spectra showed the presence of visible and infrared bands. While the visible emission is explained by radiative recombination caused by interband transitions, the infrared emission is accounted for by the intraband transitions. Raman spectroscopy of methyl red (MR) indicator dye adsorbed on metallo-dielectric films has shown an enhancement in the Raman signals on incomplete shells. The enhancement is ascribed to the surface roughness and nanogaps making the synthesized metallo-dielectric particles a potential substrate for surface enhanced Raman spectroscopy (SERS). (c) 2014 Elsevier B.V. All rights reserved.
 
Publisher ELSEVIER SCIENCE BV
 
Date 2014-12-28T15:21:56Z
2014-12-28T15:21:56Z
2014
 
Type Article
 
Identifier JOURNAL OF MOLECULAR STRUCTURE, 1074522-526
0022-2860
1872-8014
http://dx.doi.org/10.1016/j.molstruc.2014.06.040
http://dspace.library.iitb.ac.in/jspui/handle/100/16860
 
Language English