Issue 24, 2022

Direct synthesis of Au–Ag nanoframes by galvanic replacement via a continuous concaving process

Abstract

Controlled synthesis of noble-metal nanoframes is of great interest due to their promising applications in plasmonics and catalysis. However, the synthesis is largely limited to a multiple-step approach involving selective deposition followed by selective etching. Here we report a facile and general strategy to synthesize Au–Ag nanoframes based on a direct galvanic replacement reaction between Ag nanoparticles and a gold(I) complex, sodium aurothiosulfate, without an extra etching process. The formation of Au–Ag nanoframes in our approach undergoes a continuous concaving and hollowing-out process from Ag templates, which is related to selective Au deposition and the Kirkendall effect. As a proof-of-concept, it was shown that Au–Ag nanoframes with different dimensions can be prepared from the corresponding Ag nanocolloids using our strategy. The prepared wire-like Au–Ag nanoframes show superior single-particle surface-enhanced Raman scattering due to the linear narrow nanogaps within the nanoframes. We believe this study signifies a new approach by mediating galvanic replacement to prepare noble-metal nanoframes with precise controllability, which may enable a variety of applications in plasmonics and catalysis.

Graphical abstract: Direct synthesis of Au–Ag nanoframes by galvanic replacement via a continuous concaving process

Supplementary files

Article information

Article type
Paper
Submitted
23 Mar 2022
Accepted
13 May 2022
First published
17 May 2022

Nanoscale, 2022,14, 8825-8832

Direct synthesis of Au–Ag nanoframes by galvanic replacement via a continuous concaving process

F. Cheng, W. Gu, H. Zhang, C. Song, Y. Zhu, F. Ge, K. Qu, H. Xu, X. Wu and L. Wang, Nanoscale, 2022, 14, 8825 DOI: 10.1039/D2NR01600A

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