1. Highly selective and sensitive visualizable detection of Hg2+ based on anti-aggregation of gold nanoparticles
- Author
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Li, Yan, Wu, Ping, Xu, Hu, Zhang, Zhongping, and Zhong, Xinhua
- Subjects
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ELECTROCHEMICAL sensors , *CLUSTERING of particles , *COLLOIDAL gold , *COLORIMETRY , *ACTIVATION (Chemistry) , *MERCURY , *METAL ions - Abstract
Abstract: For the widely used gold nanoparticles (AuNPs)-based colorimetric probes, AuNPs generally change from dispersion to aggregation state accompanying with corresponding color turning from red to blue. Although colorimetric probes based on the anti-aggregation of AuNPs show exceptional selectivity and sensitivity, few examples have been reported in literature. A facile but highly sensitive and selective colorimetric probe based on the anti-aggregation of AuNPs transferred from the deactivation of aggregation agent 4,4′-dipyridyl by Hg2+ was developed in this work. This reported probe is suitable for real-time detection of Hg2+ in water with a detection limit of 3.0ppb for Hg2+, and exhibits a selectivity toward Hg2+ by two orders of magnitude over other metal ions. The dynamic range of this probe can be conveniently tuned by adjusting the amount of 4,4′-dipyridyl used. [Copyright &y& Elsevier]
- Published
- 2011
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