Colorimetric detection of Cu²⁺ by surface coordination complexes of polyethyleneimine-capped Au nanoparticles

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• 作者：Wenfeng Zhao^a ; ^b ; ^{zhaowf@jsnu.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae ; Wei Jia^aAuthor Vitae ; Mimi Sun^aAuthor Vitae ; Xiaojun Liu^aAuthor Vitae ; Qingquan Zhang^aAuthor Vitae ; Chenghua Zong^aAuthor Vitae ; Jie Qu^cAuthor Vitae ; Hongwei Gai^a ; ^{gai@jsnu.edu.cn" class="auth_mail" title="E-mail the corresponding author}Author Vitae
• 关键词：Colorimetric detection ; Copper ions ; Gold nanoparticles ; Polyethyleneimine
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：223
• 期：Complete
• 页码：411-416
• 全文大小：1062 K

文摘

A new simple colorimetric chemosensor for sensitive and selective detection of Cu²⁺ using polyethyleneimine (PEI)-capped Au nanoparticles (PEI/Au NPs) has been developed. PEI/Au NPs are synthesized by using PEI as reducer without adding nanoparticles seeds and stabilizing agent. Copper ions are captured by the amino groups of the PEI/Au NPs to form an absorbent complex at the surface of PEI/Au NPs, resulting in the color of PEI/Au NPs changing from wine red to purple. Under the optimal conditions, the proposed colorimetric sensor is capable of sensitively and specifically detecting Cu²⁺ with a detection limit of 0.29 μM and a linear range of 25–300 μM. This method is simple, fast and highly selective for Cu²⁺ in the presence of high concentrations of other environmentally relevant metal ions because of the great specific coordination between Cu²⁺ and PEI, which potentially meets the requirement of the detection in real samples. Moreover, addition of EDTA to PEI/Au NPs-Cu²⁺ recovers the color offering PEI/Au NPs as a promising reversible sensor for practical application.