石墨烯/聚苯胺复合材料修饰碳糊电极测定镉(Ⅱ)离子  

Graphene Sheets/Polyaniline Composites Modified Carbon Paste Electrode for the Determination of Cd^(2+)

作　　者：戴虹[1] 焦晨旭[1] 王磊[1] 侯国忠[1] 

机构地区：[1]中北大学理学院,太原030051

出　　处：《材料导报》2016年第8期51-55,共5页Materials Reports

基　　金：山西省自然科学基金(2009011015-2)

摘　　要：采用原位聚合法制备石墨烯/聚苯胺复合材料,利用透射电子显微镜(TEM)和X射线衍射(XRD)对其进行了表征;并将制得的石墨烯/聚苯胺复合材料作为化学修饰剂制成石墨烯/聚苯胺复合材料修饰碳糊电极,利用三电极体系循环伏安法,在NH3-NH4Cl缓冲溶液中测定镉离子(Cd^(2+))的电化学行为。结果表明:石墨烯/聚苯胺(GSs/PANI)复合材料提高了碳糊电极的电化学性能,使其对Cd^(2+)的电化学响应和选择性均得到提高。在石墨烯/聚苯胺复合材料质量分数为0.5%,pH=10.75的NH3-NH4Cl缓冲溶液的最佳检测条件下,Cd^(2+)的响应电流与Cd^(2+)的浓度在1.0×10-8~2.0×10-5 mol·L-1的范围内呈现出良好的线性关系,相关系数为0.9939,检出限为2.246×10-8 mol·L-1。The graphene sheets/polyaniline （GSs/PANI） composite was synthesized by using an in situ poly- merization procedure, and was characterized by TEM and XRD. The composite was used to prepare graphene sheets/ polyaniline composite modified carbon paste electrode （GSs/PANI-CPE）, which was conducted to determine the electrochemical behavior of Cd2＋ under different conditions in the three-electrode system by cyclic voltammetry. It was showed that the composite greatly enhanced the electrochemical performance of the GSs/PANI-CPE, which improved the signal response and selectivity of sensor to Cd2＋. In the condition of the composite（0. 5%） and the buffer solution （pH= 10. 75）, the peak current varied linearly with the concentrate of Cd2＋ over the range from 1.0 × 10-8 mol . g-1 to 2. 0× 10-5 mol . L- 1 with the correlation coefficient of 0. 9939 and the detection limit of 2. 246× 10-8 mol. L-1.

关 键 词：修饰碳糊电极 循环伏安法 石墨烯/聚苯胺复合材料 镉(Ⅱ) 

分 类 号：O657.1[理学—分析化学]