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Ag core–Au shell bimetallic nanocomposites: Gold shell thickness dependent study for SERS enhancement

Khurana, Parul and Thatai, Sheenam and Prasad, Surendra and Soni, Sarvesh K. and Kumar, Dinesh (2016) Ag core–Au shell bimetallic nanocomposites: Gold shell thickness dependent study for SERS enhancement. Microchemical Journal, 124 . pp. 819-823. ISSN 0026-265X

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    Abstract

    This study reports the synthesized core–shell bimetallic nanocomposites of silver and gold, respectively by varying the thickness of Au shell and studying its role in enhancing the Raman scattering of the molecule. The crystal violet (CV) was chosen as the target analyte molecule and the surface enhanced Raman scattering (SERS) enhancement of thismoleculewas studied as a function of Au shell thickness. The appropriate thickness of Au nanoshell, deposited on the Ag nanoparticles to obtain the maximum SERS enhancement, was identified and further increase in thickness of Au showed a decrease in intensity of the SERS signals. Among all the fabricated Ag@Au specimens ~30 nmof Ag seedwith 8 nmof Au nanoshell showed the maximumenhancement of the SERS signals of CV. The close proximity of discontinuous Au shell acts as SERS hot spots by creating molecular level gap that accommodates the CV molecules responsible for the SERS enhancement up to the order of 1013 which is highly reproducible.

    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
    Date Deposited: 11 Apr 2016 16:31
    Last Modified: 13 Oct 2017 11:32
    URI: http://repository.usp.ac.fj/id/eprint/8808
    UNSPECIFIED

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