Publication Date

Spring 2017

Document Type

Project Summary

Degree Name

Master of Science

Department

Analytical Chemistry

First Advisor

K. G. Sanjaya Ranmohotti, Ph.D.

Abstract

It generally requires solid metal templates of hollow metal structures with uniform morphology by the present galvanic replacement mediated-growth approaches. In this project report, we present a new and simple approach for the controllable synthesis of Au/Ag alloy nanoshells (NSs) by applying galvanic replacement reaction on hollow Ag template in the presence of gold salt. High quality thiol-coated spherical shape Au/Ag NSs were produced via this new synthetic approach and the hollow interior of the Ag template is very well preserved during the galvanic replacement reaction. Plasmonic property measurements reveal that Au/Ag NSs exhibit strong absorption peak and more importantly, these can maintain their optical properties even after several months. These nanoshells were studied by TEM to elucidate their structure. These studies show that the nanostructures are hollow and do not consist of a Ag core surrounded by a Au shell. The excellent stability along with the ability to maintain long lasting plasmonic features make these Au/Ag NSs useful candidates to test for fascinating application in surface plasmonics, surface-enhanced Raman scattering, chemical and biological sensing and optical labeling.

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