Issue 1, 2011

Chemical redox-regulated mesoporous silica-coated goldnanorods for colorimetric probing of Hg2+ and S2−

Abstract

The past a few years have witnessed the wide use of metallic nanoparticles as ideal reporters for colorimetric detection, which generally involves an analyte-triggered alteration of aggregation degree of applied nanoparticles, and thus the change of colloidal color. However, these aggregation-based colorimetric probe are associated with a number of drawbacks, including poor stability of nanoaggregates, requirement of complicated functionalization and non-linearity of output signals. To address these problems, we herein employ mesoporous silica-coated gold nanorods (MS AuNRs) as novel nanocomposites for non-aggregation-based label-free colorimetric sensing relying on their chemical redox-modulated surface chemistry. In our sensing system, Hg2+ ions are reduced to Hg0 depositing on the surface of MS AuNPs and result in a great color change of MS AuNRs, while the subsequent introduction of S2− leads to a reverse process owing to the extraction of Hg0 by S2−. The experimental results for colorimetric sensing of Hg2+ and S2− imply considerable sensitivity and specificity, suggesting the high potential of our approach for rapid environmental monitoring and bioanalysis in the future.

Graphical abstract: Chemical redox-regulated mesoporous silica-coated gold nanorods for colorimetric probing of Hg2+ and S2−

Supplementary files

Article information

Article type
Paper
Submitted
02 Aug 2010
Accepted
19 Aug 2010
First published
29 Sep 2010

Analyst, 2011,136, 174-178

Chemical redox-regulated mesoporous silica-coated gold nanorods for colorimetric probing of Hg2+ and S2−

G. Wang, Z. Chen, W. Wang, B. Yan and L. Chen, Analyst, 2011, 136, 174 DOI: 10.1039/C0AN00597E

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