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论文类型： 期刊论文

发表时间： 2018-02-01

发表刊物： SENSORS AND ACTUATORS B-CHEMICAL

收录刊物： SCIE、EI

卷号： 255

页面范围： 808-813

ISSN号： 0925-4005

关键字： Gold nanoparticle; Ag+ detection; Environmental monitoring; Synergistic coordination; Colorimetric sensor

摘要： 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 0.1-0.9 mu M, covering the Ag+ standard in drinking waters (0.46 p[M, US Environmental Protection Agency). This system is not only convenient but also very sensitive with a limit detection of 7.3 nM. This platform is applicable for the Ag+ recognition in mimic pollution samples with a good repeatability and relative standard deviation. (C) 2017 Published by Elsevier B.V.