Stripping Voltammetric Detection of Mercury(II) Based on a Bimetallic Au-Pt Inorganic-Organic Hybrid Nanocomposite Modified Glassy Carbon Electrode
Stripping Voltammetric Detection of Mercury(II) Based on a Bimetallic Au-Pt Inorganic-Organic Hybrid Nanocomposite Modified Glassy Carbon Electrode
复制标题
基于双金属Au-Pt无机-有机杂化纳米复合材料修饰玻碳电极的溶出伏安法检测汞(II)
DOI：
10.1021/ac901846a
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发表时间：
2010-01-15
影响因子：
7.4
通讯作者：
Hu, Xianluo
中科院分区：
文献类型：
--
作者：
Gong, Jingming;Zhou, Ting;Hu, Xianluo
利用一种新型的无机-有机杂化纳米复合材料修饰玻碳电极，即Au-Pt纳米粒子/有机纳米纤维（Au-PtNPs/NFs），研制了一种新型的、高灵敏度和高选择性的阳极溶出伏安法汞（II）电化学传感器。该传感器具有三维（3D）多孔网络纳米结构，其中作为金属NP基微电极系综的Au-Pt NPs均匀分布在交错的有机NFs基质中。利用扫描电子显微镜（SEM）和X射线光电子能谱仪（MS）对传感器的表面结构和成分进行了表征。系统研究了其电化学性能。我们的研究结果表明，这种新设计的，Au-PtNPs/NF纳米杂化修饰电极提供了显着提高的灵敏度和选择性的模具剥离测定汞（II）。检测限为0.008 ppb（S/N = 3），远低于世界卫生组织（WHO）的标准值。有效抑制了与汞分析相关的其他重金属离子如Cu（II）、Cr（III）、Co（H）、Fe（H）、Zn（II）和Mn（II）离子的干扰。为了实现实际应用的目标，通过监测自来水和河水样品中的Hg（II），对传感器进行了进一步评估。
A new, highly sensitive and selective sensor for the electrochemical assay of Hg(II) by anodic stripping voltammetry has been developed, whereby it glassy carbon electrode is modified with a novel inorganic-organic hybrid nanocomposite, namely, bimetallic Au-Pt nanoparticles/organic nanofibers (labeled as Au-PtNPs/NFs). The sensor possesses a three-dimensional (3D) porous network nanoarchitecture, in which the bimetallic Au-Pt NPs serving as metal NP-based microelectrode ensembles are homogenously distributed in the matrix of interlaced organic NFs. The surface structure and composition of the sensor were characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy MS). Its electrochemical performance was systematically investigated. Our results show that such a newly designed, Au-PtNPs/NF nanohybrid modified electrode provides remarkably improved sensitivity and selectivity for die stripping assay of Hg(II). The detection limit is found to be its low as 0.008 ppb (S/N = 3) that is much below the guideline value from the World Health Organization (WHO). Interferences from other heavy metal ions such as Cu(II), Cr(III), Co(H), Fe(H), Zn(II), and Mn(II) ions associated with mercury analysis are effectively inhibited. Toward the goal for practical applications, the sensor was further evaluated by monitoring Hg(II) in tap and river water specimens.