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 this molecule was 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 ~30nm of Ag seed with 8nm of Au nanoshell showed the maximum enhancement 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.
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