期刊
NANOSCALE
卷 9, 期 41, 页码 15901-15910出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nr06662g
关键词
-
类别
资金
- National Natural Science Foundation of China [21373059, 21433002]
- National Key Basic Research Program of China [2013CB934101]
- Science & Technology Commission of Shanghai Municipality [16DZ2270100]
- National 1000 Youth Talents Program of China
Three-dimensional surface-enhanced Raman scattering (SERS) substrates are prepared via the in situ deposition of silver nanoparticles (AgNPs) on silica nanowire (SiO2 NW) assemblies, either in a free-standing membrane structure or as an optically transparent film supported on Scotch tape. The negatively charged surface of the SiO2 NW favors Ag+ ion enrichment around itself, with the ions forming densely deposited AgNPs on the NW after reducing agents are added to the solution. A SERS substrate with high sensitivity is achieved owing to abundant hot spots generated by the inter-AgNP gaps in the 3D geometry of the NW networks. The AgNP-deposited SiO2 NW membrane has a SERS enhancement factor of 2.9 x 10(8) and a detection limit of 10(-9) M towards 4-mercaptopyridine probing and 10(-8) M towards dithio-carbamate pesticide (i.e., thiram) probing. Moreover, the AgNP-deposited, Scotch tape-supported SiO2 NW film achieves non-invasive, direct detection of real-world surfaces due to its high sensitivity, high flexibility and optically transparent properties.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据