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Issue 13, 2011
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A one-step colorimetric method of analysis detection ofHg2+ based on an in situ formation of Au@HgS core–shell structures

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Abstract

A new approach for the detection of Hg2+ is reported based on color changes from which gold nanoparticles (Au NPs) are surrounded by a layer of HgS quantum dots to form in situ Au@HgS core–shell nanostructures. The surface plasmon resonance (SPR) absorption of the gold core was changed due to a shell layer of HgS formed on the surface of the Au NPs, which brings the colour change of the aqueous solution. Therefore, Hg2+ can be recognized by visualizing the colour change of the Au@HgS core–shell nanostructures, and can be detected quantitatively by measurement of the UV-vis spectra. Some effects on the detection of Hg2+ were investigated in detail. This method was used to detect Hg2+ with excellent selectivity and high sensitivity. In our method, the lowest detected concentrations for mercury ions were 5.0 × 10−6 M observed by the naked eye and 0.486 nM as measured by UV-vis spectra. At the range from 8.0 × 10−5 to 1.0 × 10−8 M of Hg2+, this method was shown to have a good linear relationship.

Graphical abstract: A one-step colorimetric method of analysis detection of Hg2+ based on an in situ formation of Au@HgS core–shell structures

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Article information


Submitted
11 Feb 2011
Accepted
08 May 2011
First published
24 May 2011

Analyst, 2011,136, 2825-2830
Article type
Paper

A one-step colorimetric method of analysis detection of Hg2+ based on an in situ formation of Au@HgS core–shell structures

F. Zhang, L. Zeng, C. Yang, J. Xin, H. Wang and A. Wu, Analyst, 2011, 136, 2825
DOI: 10.1039/C1AN15113D

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