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

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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 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 × 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 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.

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

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Publication details

The article was received on 07 Sep 2017, accepted on 13 Sep 2017 and first published on 14 Sep 2017


Article type: Paper
DOI: 10.1039/C7NR06662G
Citation: Nanoscale, 2017, Advance Article
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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, Advance Article , DOI: 10.1039/C7NR06662G

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