The Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Science, Nankai University, Tianjin 300071, China.
Talanta. 2011 May 15;84(3):673-8. doi: 10.1016/j.talanta.2011.01.064. Epub 2011 Feb 2.
A silver nanowires modified platinum (Ag NWs/Pt) electrode was developed for simultaneous and selective determination of chloride, bromide and iodide ions by cyclic voltammetry in aqueous solutions. Silver nanowires were synthesized by an l-cysteine-assisted poly (vinyl pyrrolidone) (PVP)-mediated polyol route. X-ray diffraction (XRD) and scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDS) were employed to investigate the prepared nanowires. The intrinsic high surface area and the fast electron transfer rate ascribed from the nanowire structure could further improve halide detection performance. The determination was based on measurement of the well-separated oxidation peak currents of respective silver halides formed on the surface of silver during an anodic potential sweep. The concentration range was linear from 50 μM to 20.2mM for bromide and iodide and 200 μM to 20.2mM for chloride, and the sensitivity was 0.059 μA/mM, 0.042 μA/mM and 0.032 μA/mM for chloride, bromide and iodide, respectively. The correlation coefficient was 0.999 in each case. The Ag NWs/Pt electrode offered a useful platform for the development of a highly sensitive halide sensor.
一种基于银纳米线修饰的铂电极（Ag NWs/Pt），通过循环伏安法在水溶液中实现了对氯离子、溴离子和碘离子的同时、选择性测定。银纳米线是通过 L-半胱氨酸辅助的聚（乙烯吡咯烷酮）（PVP）介导的多元醇路线合成的。采用 X 射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和能谱（EDS）对制备的纳米线进行了研究。纳米线结构赋予的固有高表面积和快速电子转移速率，进一步提高了卤化物检测性能。测定基于在银表面上形成的各自银卤化物在阳极电势扫描期间的氧化峰电流的测量。对于溴化物和碘化物，浓度范围从 50μM 到 20.2mM 呈线性，对于氯离子，浓度范围从 200μM 到 20.2mM 呈线性，灵敏度分别为 0.059μA/mM、0.042μA/mM 和 0.032μA/mM。在每种情况下，相关系数均为 0.999。Ag NWs/Pt 电极为开发高灵敏度卤化物传感器提供了一个有用的平台。
