Direct synthesis of Au–Ag nanoframes by galvanic replacement via a continuous concaving process. Issue 24 (10th June 2022)

• Record Type: Journal Article
• Authors: Cheng, Fang; Gu, Wenjie; Zhang, Han; Song, Chunyuan; Zhu, Yunfeng; Ge, Feiyue; Qu, Kuiming; Xu, Hai; Wu, Xue-Jun; Wang, Lianhui
• Is Part Of: Nanoscale. Volume 14:Issue 24(2022)
• Page Start: 8825
• Page End: 8832
• Publication Date: 2022-06-10
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/d2nr01600a
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : A continuous concaving and hollowing-out process was discovered during noble-metal nanoframe synthesis based on a one-step galvanic replacement strategy. 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.