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Issue 17, 2016
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In solution SERS sensing using mesoporous silica-coated gold nanorods

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Abstract

Mesoporous silica-coated gold nanorods (AuNR@MS) act as a colloidally stable Raman sensing platform with a built-in analyte size cutoff. Herein, these core–shell plasmonic nanostructures were presented with a range of thiolated Raman-active molecules to probe the limits of this platform for SERS sensing. The experimental results show generally, that the transport of molecules through the mesopores is highly dependent on the size of the molecule and specifically, that AuNR@MS with pores of ∼4 nm diameter are able to sense analytes with molecular dimensions smaller than 1.5 nm. This sensing platform will likely find broad use, performing well even in complex media based on the high colloidal stability imbued by the mesoporous silica shell.

Graphical abstract: In solution SERS sensing using mesoporous silica-coated gold nanorods

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Article information


Submitted
20 May 2016
Accepted
04 Jul 2016
First published
04 Jul 2016

Analyst, 2016,141, 5088-5095
Article type
Paper

In solution SERS sensing using mesoporous silica-coated gold nanorods

Z. Gao, N. D. Burrows, N. A. Valley, G. C. Schatz, C. J. Murphy and C. L. Haynes, Analyst, 2016, 141, 5088
DOI: 10.1039/C6AN01159D

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