A novel nonenzymatic hydrogen peroxide sensor based on silver nanoparticles and ionic liquid functionalized multiwalled carbon nanotube composite modified electrode
A novel nonenzymatic hydrogen peroxide sensor based on silver nanoparticles and ionic liquid functionalized multiwalled carbon nanotube composite modified electrode
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DOI：
10.1016/j.electacta.2013.09.049
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发表时间：
2013-12-15
影响因子：
6.6
通讯作者：
Liu, Xiuhui
中科院分区：
文献类型：
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作者：
Li, Xiaoyan;Liu, Yuanxiang;Liu, Xiuhui
在离子液体功能化多壁碳纳米管(MWCNTs-IL)复合修饰的玻碳电极(GCE)上电沉积纳米银(NPs)，制备了一种新型的过氧化氢(H_2O_2)传感器。采用扫描电子显微镜(SEM)、循环伏安法(CV)和交流阻抗谱(EIS)等方法对AgNPs/MWCNTs-IL复合材料进行了表征。该电极对H_2O_2的还原具有良好的催化活性，H_2O_2浓度在1.2×10~(-8)~4.8×10~(-6)M范围内呈良好的线性关系，检出限为3.9×10~(-9)M，可用于实际样品的分析。过氧化氢传感器的优异性能归功于MWCNTs-IL复合材料作为沉积AgNPs的有效负载基质，以及AgNPs和MWCNTs两种纳米材料的协同放大效应。因此，提出了构建的传感器的催化机理。将分散在MWCNTs-IL上的AgNPs作为H_2O_2转化为O_2的催化剂，生成的氧通过电极上的还原传递到电极周围。(C)2013爱思唯尔有限公司。保留所有权利。
A novel hydrogen peroxide (H2O2) sensor was fabricated by electrodepositing Ag nanoparticles (NPs) on a glassy carbon electrode (GCE) modified with ionic liquid functionalized multiwalled carbon nanotube (MWCNTs-IL) composites. The AgNPs/MWCNTs-IL composite was characterized by different methods including scanning electron microscopy (SEM), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The constructed electrode exhibited good catalytic activity toward the reduction of H2O2, and obtained a linear response to logarithm of the H2O2 concentrations ranging from 1.2 x 10(-8) to 4.8 x 10(-6) M with a limit of detection (LOD) of 3.9 x 10(-9) M. Moreover, it can be applied to real samples analysis. The excellent performance of hydrogen peroxide sensor were ascribed to the MWCNTs-IL composites being used as effective load matrix for the deposition of AgNPs and the synergistic amplification effect of the two kinds of nanomaterials - AgNPs and MWCNTs. Therefore, the catalytic mechanism of the constructed sensor was proposed. AgNPs dispersed on MWCNTs-IL were used as the catalyst for the H2O2 into O-2, and the generated oxygen transported the electrode surrounding where it was detected by reduction on the electrode. (C) 2013 Elsevier Ltd. All rights reserved.