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Silica nanowire assemblies as three-dimensional, optically transparent platforms for constructing highly active SERS substrates

Abstract

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 favours 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 AgNPs-deposited SiO2 NW membrane has a SERS enhancement factor of 2.9×108 and a detection limit of 10-9 M towards 4-mercaptopyridine probing and 10-8 M towards dithiocarbamate pesticide (i.e., thiram) probing. Moreover, the AgNPs-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.

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Publication details

The article was accepted on 13 Sep 2017 and first published on 14 Sep 2017


Article type: Paper
DOI: 10.1039/C7NR06662G
Citation: Nanoscale, 2017, Accepted Manuscript
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    Silica nanowire assemblies as three-dimensional, optically transparent platforms for constructing highly active SERS substrates

    Y. Liu, C. Deng, D. Yi, X. Wang, Y. Tang and Y. Wang, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR06662G

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