期刊
NANO LETTERS
卷 16, 期 6, 页码 3675-3681出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b00868
关键词
Porous nanoparticles; plasmonic nanoparticles; dealloying process; hotspots; surface-enhanced Raman scattering
类别
资金
- National Natural Science Foundation of China [21301138]
- Xi'an Jiaotong University
- U.S. National Science Foundation [CHE-1308587]
- Fundamental & Advanced Research Project of Chongqing, China [cstc2013jcyjC00001]
- Direct For Mathematical & Physical Scien [1308587] Funding Source: National Science Foundation
- Division Of Chemistry [1308587] Funding Source: National Science Foundation
Colloidal plasmonic metal nanoparticles have enabled surface-enhanced Raman scattering (SERS) for a variety of analytical applications. While great efforts have been made to create hotspots for amplifying Raman signals, it remains a great challenge to ensure their high density and accessibility for improved sensitivity of the analysis. Here we report a dealloying process for the fabrication of porous Au-Ag alloy nanoparticles containing abundant inherent hotspots, which were encased in ultrathin hollow silica shells so that the need of conventional organic capping ligands for stabilization is eliminated, producing colloidal plasmonic nanoparticles with clean surface and thus high accessibility of the hotspots. As a result, these novel nanostructures show excellent SERS activity with an enhancement factor of similar to 1.3 x 10(7) on a single particle basis (off-resonant condition), promising high applicability in many SERS-based analytical and biomedical applications
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