Functionalized polypyrrole nanotube arrays as electrochemical biosensor for the determination of copper ions

详细信息    查看全文

• 作者：Meng Lin ; Xiaoke Hu ; Zhaohu Ma ; Lingxin Chen
• 关键词：Electrochemical biosensor ; Conducting polymer ; Polypyrrole nanotube arrays ; Zinc oxide nanowire arrays ; Copper ions
• 刊名：Analytica Chimica Acta
• 出版年：2012
• 出版时间：9 October, 2012
• 年：2012
• 卷：746
• 期：Complete
• 页码：63-69
• 全文大小：968 K

文摘

A novel electrochemical biosensor based on functionalized polypyrrole (PPy) nanotube arrays modified with a tripeptide (Gly-Gly-His) proved to be highly effective for electrochemical analysis of copper ions (Cu²⁺). The vertically oriented PPy nanotube arrays were electropolymerized by using modified zinc oxide (ZnO) nanowire arrays as templates which were electrodeposited on indium-tin oxide (ITO) coated glass substrates. The electrodes were functionalized by appending pyrrole-¦Á-carboxylic acid onto the surface of polypyrrole nanotube arrays by electrochemical polymerization. The carboxylic groups of the polymer were covalently coupled with the amine groups of the tripeptide, and its structural features were confirmed by attenuated total reflection infrared (ATR-IR) spectroscopy. The tripeptide modified PPy nanotube arrays electrode was used for the electrochemical analysis of various trace copper ions by square wave voltammetry. The electrode was found to be highly sensitive and selective to Cu²⁺ in the range of 0.1-30 ¦ÌM. Furthermore, the developed biosensor exhibited a high stability and reproducibility, despite the repeated use of the biosensor electrode.