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Porous Au-Ag Nanospheres with High-Density and Highly Accessible Hotspots for SERS Analysis
Liu, Kai1; Bai, Yaocai2; Zhang, Lei1; Yang, Zhongbo3; Fan, Qikui1; Zheng, Haoquan4; Yin, Yadong2; Gao, Chuanbo1
2016-06-01
摘要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
关键词Porous nanoparticles plasmonic nanoparticles dealloying process hotspots surface-enhanced Raman scattering
DOI10.1021/acs.nanolett.6b00868
发表期刊NANO LETTERS
ISSN1530-6984
卷号16期号:6页码:3675-3681
通讯作者Gao, CB (reprint author), Xi An Jiao Tong Univ, Frontier Inst Sci & Technol, Ctr Mat Chem, Xian 710054, Shaanxi, Peoples R China.
收录类别SCI
WOS记录号WOS:000377642700039
语种英语