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Visual detection of silver(I) ions by a chromogenic reaction catalyzed by gold nanoparticles |
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| Authors: | Baoxia Liu Hongliang Tan Yang Chen |
| Affiliation: | 1. State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, People’s Republic of China |
| Abstract: | We report on a novel method for visual detection silver(I) ion. It is based on the finding that Ag(I) ions are rapidly reduced by hydroquinone to form a shell of silver on the surface of gold nanoparticles (AuNPs) which act as catalysts for this reaction. This leads to a color change from red to yellow which can be seen with bare eyes. This scheme is sensitive and highly specific for Ag(I) ions. The detection limits are 5 μM for visual inspection and 1 μM for photometric readout, respectively. The method was successfully applied to the determination of Ag(I) ions in spiked lake water and soil. A novel visual detection method based on the catalysis of gold nanoparticles was developed for the determination of Ag+ in the lake water and soil. |
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