A Supersensitive Probe for Rapid Colorimetric Detection of Nickel Ion Based on a Sensing Mechanism of Anti-etching

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• 作者：Ningyi Chen ; Yujie Zhang ; Hongyu Liu ; Huimin Ruan ; Chen Dong ; Zheyu Shen ; Aiguo Wu
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2016
• 出版时间：December 5, 2016
• 年：2016
• 卷：4
• 期：12
• 页码：6509-6516
• 全文大小：422K
• ISSN：2168-0485

文摘

Redundant nickel is harmful to human health and can result in skin diseases, allergies, or cancer. Although many probes based on noble metal nanoparticles have been established for rapid heavy metal ion detection by the naked eye or ultraviolet–visible (UV–vis) spectroscopy, few noble metal nanomaterials have been developed for Ni²⁺ detection. In this study, we propose novel triangular silver nanoprisms (AgNPRs) stabilized with glutathione (GSH) for rapid colorimetric detection of Ni²⁺ based on a sensing mechanism of anti-etching, which has been affirmed by Raman spectra, UV–vis spectra, transmission electron microscopy, and dynamic light scattering. At the optimal experimental parameters, our GSH-AgNPR-based Ni²⁺ probe has an excellent selectivity compared with those of 26 other ions because Ni²⁺ can inhibit the AgNPR etching by iodide ion (I^–) (i.e., anti-etching) while other ions cannot. The limit of detection (LOD) of our Ni²⁺ probe is 50 nM via the naked eye and 5 nM via UV–vis spectroscopy. They are both negligible compared with the permissible limit of Ni²⁺ in drinking water (0.34 μM) prescribed by the World Health Organization. In particular, the latter is far lower than the LOD values of other reported Ni²⁺ probes based on noble metal nanomaterials. A satisfying linear relationship reinforces that our probe can be utilized for the quantitative analysis of Ni²⁺. The detection of real water samples indicates that our probe could be used for rapid Ni²⁺ colorimetric detection with supersensitivity and excellent selectivity in real environmental water samples.