Selective chemiluminescent sensor for detection of mercury(II) ions using non-aggregated luminol-capped gold nanoparticles

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• 作者：Qi LiAuthor Vitae ; Jiahua WangAuthor Vitae ; Yi He ; ^{yhe2014@126.com" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：Mercury(II) ions ; Chemiluminescent sensor ; Gold nanoparticles ; Non-aggregation
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：231
• 期：Complete
• 页码：64-69
• 全文大小：1017 K

文摘

A selective chemiluminescent sensor was developed for the detection of mercury(II) ions (Hg²⁺) in environmental water and soil supernatant samples using non-aggregated luminol-capped gold nanoparticles (AuNPs). Luminol-capped AuNPs can react with silver nitrate (AgNO₃) under alkaline environment, generating a strong chemiluminescence (CL) emission because AuNPs had excellent catalytic activity for luminol-AgNO₃ CL system. However, when Hg²⁺ was added to the solution of luminol-capped AuNPs, it would be adsorbed on the surface of luminol-capped AuNPs according to the inherent affinity of AuNPs for Hg²⁺. The presence of Hg²⁺ significantly inhibited the catalytic activity of AuNPs, leading to CL quenching. With the increasing of Hg²⁺ concentration, the CL intensity gradually decreased. Under the optimal detection conditions, the developed CL sensor showed a good linear relationship in range of 10–600 nM with a limit of detection of 1 nM at a signal-to-noise ratio of three which was below the maximum allowable concentration for Hg²⁺ in drinking water (10 nM) defined by United States Environmental Protection Agency. Also, the developed CL sensor exhibited high selectivity toward Hg²⁺ over other environmentally relevant metal ions at high concentrations (500 μM).