One-step electrodeposition of a molecularly imprinting chitosan/phenyltrimethoxysilane/AuNPs hybrid film and its application in the selective determination of p-nitrophenol
One-step electrodeposition of a molecularly imprinting chitosan/phenyltrimethoxysilane/AuNPs hybrid film and its application in the selective determination of p-nitrophenol
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分子印迹壳聚糖/苯基三甲氧基硅烷/AuNPs杂化薄膜的一步电沉积及其在对硝基苯酚选择性测定中的应用
DOI：
10.1039/c3an36497f
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发表时间：
2013-01-01
期刊：
影响因子：
4.2
通讯作者：
Zhang, Aidong
中科院分区：
文献类型：
--
作者：
Li, Shanshan;Du, Dan;Zhang, Aidong
本文介绍了壳聚糖（CS）、苯基三甲氧基硅烷（PTMS）、原位形成金纳米粒子（AuNPs）和模板对硝基苯酚（p-NP）组成的分子印迹溶胶-凝胶杂化膜的一步电沉积制备方法。通过扫描电镜和电化学阻抗分析发现，在-0.30 V vs. SCE下施加最佳电位触发电沉积，导致p-NP印迹CS/PTMS/AuNPs杂化膜在玻璃碳电极（GCE）上形成，具有大致的结构和导电性质。讨论了杂化膜形成的机理。在循环伏安法辅助下完全去除模板分子后，p-NP印迹膜修饰电极对p-NP表现出3.0 × 10（-8）至3.5 × 10(-4) M的线性差分脉冲伏安（DPV）响应，检测限为5.0 × 10(-9) M。通过区分p-NP响应及其类似物和连续的再结合/脱粘循环，证明了该传感器的选择性和可重用性。该方法可扩展为开发混合膜传感器的简单通用平台，用于各种电化学活性物质的特定测定。
This paper presents the fabrication of a molecularly imprinting sol-gel hybrid film by the one-step electrodeposition of the constitutional individuals including chitosan (CS), phenyltrimethoxysilane (PTMS), in situ formed gold nanoparticles (AuNPs) and template p-nitrophenol (p-NP). The electrodeposition was triggered by applying an optimal potential at -0.30 V vs. SCE, leading to the formation of the p-NP imprinting CS/PTMS/AuNPs hybrid film on a glassy carbon electrode (GCE) with a roughly architectural and conductive nature, as revealed by scanning electron microscopy and electrochemical impedance analysis. The mechanism of the hybrid film formation was discussed accordingly. Upon complete removal of the template molecules assisted by cyclic voltammetry, the p-NP imprinted film modified electrode exhibited differential pulse voltammetric (DPV) responses to p-NP in a linear range from 3.0 x 10(-8) to 3.5 x 10(-4) M with a detection limit of 5.0 x 10(-9) M. The selectivity and reusability of the sensor was demonstrated by discriminating the p-NP response from its analogues and successive rebinding/debinding cycles, respectively. The methodology is extendable as a simple and general platform for developing hybrid film sensors for the specific determination of various electrochemically active species.