Abstract
Silver is one of most important heavy metals, which affects the environment and organism significantly along with its widespread applications. An interesting gold nanoparticles (AuNPs)-based system, in this work, was fabricated using the adenosine and creatinine for the colorimetric recognition of the Ag+ via a red-to-blue color change. A synergistic coordination of these two biomolecules with Ag+ on AuNPs’ surface supplied an excellent selectivity than examples by a single ligand-modified AuNPs in literatures. It realized a qualitative Ag+ recognition by naked eyes in aqueous media, as well as a quantitative determination by the UV–vis spectrometer over a range of 0.1–0.9μM, covering the Ag+ standard in drinking waters (0.46μM, US Environmental Protection Agency). This system is not only convenient but also very sensitive with a limit detection of 7.3nM. This platform is applicable for the Ag+ recognition in mimic pollution samples with a good repeatability and relative standard deviation.
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