Highly selective and sensitive nanoprobes for Hg(II) ions based on photoluminescent gold nanoclusters

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• 作者：Yan Zhang ; ^{yanzhang@sxu.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Meifen YanAuthor Vitae ; Jingjing JiangAuthor Vitae ; Pengfei GaoAuthor Vitae ; Guomei ZhangAuthor Vitae ; Martin M.F. Choi¹Author Vitae ; Chuan DongAuthor Vitae ; Shaomin Shuang ; ^{smshuang@sxu.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：Gold nanoclusters ; Nanoprobes ; Fluorescence ; Mercury ion
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：1 November 2016
• 年：2016
• 卷：235
• 期：Complete
• 页码：386-393
• 全文大小：2199 K

文摘

We report a facile strategy to synthesize a novel fluorescent gold nanoclusters (NAC-AuNCs) in one step by using only the reactants of HAuCl₄ and N-acetyl-l-cysteine. The as-prepared AuNCs exhibited a fluorescence emission at 590 nm and a quantum yield of 13.6%. On the basis of metallophilic Hg²⁺–Au⁺ interaction-induced fluorescence quenching mechanism, the fluorescent NAC-AuNCs offer highly sensitivity with a limit of detection of 0.2 nM for determination of Hg²⁺ ions, which is 50 times lower than the limit value (10 nM) defined by the U.S. Environmental Protection Agency in drinkable water. The proposed fluorescent probe has a linear response range of 2.0–3200 nM Hg²⁺ ions and good repeatable response to 20 nM Hg²⁺ with a relative standard deviation of 3.2% (n = 6). Also, the luminescence response of the NAC-AuNCs probe in the presence of EDTA is especially selective to Hg²⁺. The proposed method has been successfully applied for determination of Hg²⁺ in various water samples, and the results agreed well with those obtained by the ICP-AES method.