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Visual detection of barium ions using tiopronin functionalised gold nanoparticles

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6 Author(s)
Lian-Yang Bai ; Hunan Univ. of Humanities, Sci. & Technol., Loudi, China ; Yu-Ping Zhang ; Na Chen ; Jun Chen
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An efficient visual detection method of Ba2+ using tiopronin (Tio)-modified gold nanoparticles (GNPs) in aqueous solution is reported. Tio could bind onto the GNP surfaces through the sulphur atom and the cross-linking of Tio-functionalised GNPs could be quickly accomplished by chelation upon the addition of Ba2+. Colour changes were observed from red to blue (or purple) within minutes with the increased concentration of Ba2+, in response to surface plasmon absorption of dispersed and aggregated nanoparticles. Using this colourimetric sensor, the concentration of Ba2+ was determined with a limit of detection lower than 1.5 × 10-6 M by the naked eye and could further be easily monitored by a UV-vis spectrometry. The possible mechanism of the aggregated Tio-GNPs was discussed by the addition of ethylenediaminetetraacetate and Ba2+ in different orders.

Published in:

Micro & Nano Letters, IET  (Volume:6 ,  Issue: 6 )

Date of Publication:

June 2011

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