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- Title
Surface micro/nanostructure evolution of Au-Ag alloy nanoplates: Synthesis, simulation, plasmonic photothermal and surface-enhanced Raman scattering applications.
- Authors
Qian, Hongmei; Xu, Meng; Li, Xiaowei; Ji, Muwei; Cheng, Lei; Shoaib, Anwer; Liu, Jiajia; Jiang, Lan; Zhu, Hesun; Zhang, Jiatao
- Abstract
This study reports the controllable surface roughening of Au-Ag alloy nanoplates via the galvanic replacement reaction between single-crystalline triangular Ag nanoplates and HAuCl in an aqueous medium. With a combination of experimental evidence and finite element method (FEM) simulations, improved electromagnetic field (E-field) enhancement around the surface-roughened Au-Ag nanoplates and tunable light absorption in the near-infrared (NIR) region (~800-1,400 nm) are achieved by the synergistic effects of the localized surface plasmon resonance (LSPR) from the maintained triangular shape, the controllable Au-Ag alloy composition, and the increased surface roughness. The NIR light extinction enables an active photothermal effect as well as a high photothermal conversion efficiency (78.5%). The well-maintained triangular shape, surface-roughened evolutions of both micro- and nanostructures, and tunable NIR surface plasmon resonance effect enable potential applications of the Au-Ag alloy nanoplates in surface-enhanced Raman spectroscopic detection of biomolecules through 785-nm laser excitation. [Figure not available: see fulltext.]
- Publication
Nano Research, 2016, Vol 9, Issue 3, p876
- ISSN
1998-0124
- Publication type
Article
- DOI
10.1007/s12274-015-0969-6