Development of promising surface enhanced Raman scattering substrate: freckled SiO2@Au nanocomposites

Khurana, P. and Thatai, S. and Boken, J. and Prasad, Surendra and Kumar, D. (2015) Development of promising surface enhanced Raman scattering substrate: freckled SiO2@Au nanocomposites. Microchemical Journal, 122 . pp. 45-49. ISSN 0026-265X

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Abstract

This paper describes SiO2@Au core–shell nanocomposites (NCs) as an excellent surface enhanced Raman scattering
(SERS) substrate in this emerging field. The network of monodispersed silica (SiO2) core of ~430 and 880 nm
sizes with varying shell thickness from 12–50 nm was synthesized. The synthesized freckled SiO2@Au NCs
provide much better surface consistency and in tune generate a huge SERS signals enhancement. The study
confirmed that the appropriate shell thickness and core size are responsible for the dramatic enhancement of
the SERS signal intensities of the analyte crystal violet (CV) molecule by an order of 1012–109. The SiO2@Au
core–shell NCs with 880 nmcore and 30 nm shell thickness showed themaximumenhancement in SERS signals
of order 1012 using CV analytemoleculewhile the NCswith diameter 430 nmand 20 nmshell thickness produced
the maximum enhancement of 109 corresponding to 1620 and 1618 cm−1 peaks respectively at the excitation
wavelength of 532 nm. The advantage of choosing freckled SiO2@Au core–shell NCs instead of nanoparticles
(NPs) is that the core being dielectric provides additional electric field to Au nanoshell. Thus it generates more domains on the surface, is responsible for the enhancement of SERS signals and has been shown to be excellent substrate for SERS sensing applications. The results showed that the SiO2@Au core–shell NCs with 880 nm core and 30 nm shell thickness act as an excellent substrate for SERS sensing.

Item Type:	Journal Article
Subjects:	Q Science > Q Science (General) Q Science > QD Chemistry
Divisions:	Faculty of Science, Technology and Environment (FSTE) > School of Biological and Chemical Sciences
Depositing User:	Fulori Nainoca - Waqairagata
Date Deposited:	22 Jun 2015 22:44
Last Modified:	14 Sep 2016 04:06
URI:	https://repository.usp.ac.fj/id/eprint/8324

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