Abstract
A simple, cost-effective yet rapid and sensitive colorimetric sensor for the detection ofHg2+ using L-cysteine functionalized gold nanoparticles induced by ultraviolet radiation wasdeveloped. The sensitivity and selectivity of detection was also investigated. The L-cysteinemodified gold nanoparticles can be induced to aggregate quickly in the presence ofHg2+, especially with the assistance of ultraviolet radiation. The presence ofHg2+ can be monitored by the colorimetric response of gold nanoparticles. The detection ofHg2+ could be realized, after measuring the UV–vis spectra, with a detection limit of100 nM. The selectivity of this method has been investigated by other divalentmetal ions. The effective colorimetric sensor can be used for on-site and real-timeHg2+ detection.
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