Wu Lidong, Fu Xiaochen, Liu Huan, Li Jincheng, Song Yi
Chinese Academy of Fishery Sciences, Beijing 100141, China.
Chinese Academy of Fishery Sciences, Beijing 100141, China.
Anal Chim Acta. 2014 Dec 3;851:43-8. doi: 10.1016/j.aca.2014.08.021. Epub 2014 Aug 15.
A novel nanocomposite was obtained through the controlled surface modification of graphene nanosheets (nanographene) with Nafion by ultrasonic oscillation. The composite was used as an ultrasensitive platform for the detection of cadmium ions (Cd(2+)) by differential pulse anodic stripping voltammetry (DPASV) analysis. The performance of the nanographene-based sensor was systematically compared with that of a multiwall carbon nanotube (MWCNT)-modified sensor. The results indicate that the nanographene-based sensor exhibits significant advantages over the MWCNT-based sensor in terms of repeatability, sensitivity and limit of detection (LOD). The nanographene-based sensor displayed superior analytical performance over a linear range of Cd(2+) concentrations from 0.25μgL(-1) to 5μgL(-1), with a LOD of 3.5ngL(-1). This sensor was also used to systematically screen for 6 types of chemicals, including sodium salts, magnesium salts and zinc salts. It was observed that the sensor could successfully differentiate cadmium ions from interferents (magnesium salts, zinc salts, etc.). The nanographene-based sensor was also demonstrated to be a promising and reliable tool for the rapid detection of cadmium existing in tap water and for the rapid on-site analysis of critical pollution levels of cadmium.
通过超声振荡用Nafion对石墨烯纳米片（纳米石墨烯）进行可控表面改性，获得了一种新型纳米复合材料。该复合材料用作差分脉冲阳极溶出伏安法（DPASV）分析检测镉离子（Cd(2+)）的超灵敏平台。将基于纳米石墨烯的传感器的性能与多壁碳纳米管（MWCNT）修饰的传感器的性能进行了系统比较。结果表明，基于纳米石墨烯的传感器在重复性、灵敏度和检测限（LOD）方面比基于MWCNT的传感器具有显著优势。基于纳米石墨烯的传感器在Cd(2+)浓度从0.25μgL(-1)到5μgL(-1)的线性范围内表现出优异的分析性能，检测限为3.5ngL(-1)。该传感器还用于系统筛选6种化学品，包括钠盐、镁盐和锌盐。观察到该传感器能够成功地将镉离子与干扰物（镁盐、锌盐等）区分开来。基于纳米石墨烯的传感器还被证明是一种用于快速检测自来水中镉以及快速现场分析镉的临界污染水平的有前途且可靠的工具。
