VISUAL SENSING OF HG2+ USING UNMODIFIED AU@AG CORE-SHELL NANOPARTICLES

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LI LIHUA; FENG DEXIANG; FANG XIAN; HAN XIAOWEI; ZHANG YUZHONG

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Journal: JOURNAL OF NANOSTRUCTURE IN CHEMISTRY Year:2014 | Volume:4 | Issue:3 Page(s): 0-0

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Title

VISUAL SENSING OF HG2+ USING UNMODIFIED AU@AG CORE-SHELL NANOPARTICLES

Author(s)

Keywords

VISUAL SENSOR

HG2+

AU@AG CORE-SHELL NANOPARTICLES

Abstract

In this work, we have developed a novel visual Hg2+ sensor in aqueous solution using unmodified AU@AG CORE-SHELL NANOPARTICLES at room temperature, based on a redox reaction between Ag-shell and Hg2+. The prepared AU@AG CORE-SHELL NANOPARTICLES exhibited good monodispersity.In the presence of Hg2+, Hg2+ was reduced into Hg (0) by Ag-shell, and deposited on the surface of Aucore to form Au-Hg alloys and caused nanoparticles aggregation, leading to the color changes of the solution from yellow to purplish red, and the surface plasmon resonance spectra of AU@AG CORE-SHELL NANOPARTICLES red shift. Under the optimal conditions, the VISUAL SENSOR could selectively detect Hg2+ as low as 0.4 mM with the naked eye and 5.0 nM by UV–vis spectra analysis methods. The designed sensor had several advantages: (1) the nanoparticles surface need not be functionalized. (2) The color change of the solution was in 2 s and could easily be observed with naked eyes. The VISUAL SENSOR had been applied to detection of Hg2+ in tap and lake water, which obtained satisfied result.

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