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(Cd2+)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Cd2+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,Cd2+的响应电流与Cd2+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.
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