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Journal of Nanomaterials
Volume 2018, Article ID 1263942, 7 pages
https://doi.org/10.1155/2018/1263942
Research Article

Nanoporous Ag-Au Bimetallic Triangular Nanoprisms Synthesized by Galvanic Replacement for Plasmonic Applications

1Department of Architecture and Civil Engineering, West Anhui University, Anhui 237012, China
2Department of Mechanical Engineering, Khalifa University of Science and Technology, Abu Dhabi 127788, UAE
3Department of Chemical Engineering, Khalifa University of Science and Technology, Abu Dhabi 127788, UAE
4International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Shaanxi 710049, China
5College of Materials and Chemical Engineering, West Anhui University, Anhui 237012, China

Correspondence should be addressed to Hongmei Qian; moc.361@1260naiqmh

Received 11 April 2018; Accepted 3 June 2018; Published 27 June 2018

Academic Editor: Rajesh R. Naik

Copyright © 2018 Hongmei Qian et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Galvanic replacement is a versatile method of converting simple noble metallic nanoparticles into structurally more complex porous multimetallic nanostructures. In this work, roughened nanoporous Ag-Au bimetallic triangular nanoprisms (TNPs) are synthesized by galvanic replacement between smooth Ag triangular plates and ions. Transmission electron microscope and the elementary mapping measurements show that numerous protrusions and pores are formed on the {111} facets, and Ag and Au atoms are homogeneously distributed on the triangular plates. Due to the additional “hot spots” generated by the surface plasmon coupling of the newly formed protrusions and pores, the roughened nanoporous Ag-Au TNP aggregates demonstrate a higher surface-enhanced Raman scattering enhancement factor (seven times larger) and better reproducibility than that of smooth Ag triangular particle aggregates. These synthesized roughened nanoporous Ag-Au bimetallic TNPs are a promising candidate for the applications in analytical chemistry, biological diagnostics, and photothermal therapy due to their excellent plasmonic performances and good biocompatibility.