石墨烯-CdS的制备及在光电化学检测Cu^(2+)中的应用

Synthesis of Graphene-CdS Nanocomposites and the Application in Selective Determination of Cu^(2+)

通过一步溶剂热法制备了石墨烯-CdS复合材料(GR-CdS),并通过XRD、TEM、HRTEM等测试手段对其进行表征.结果表明CdS纳米颗粒的生成和氧化石墨烯的还原同时发生,CdS纳米颗粒分布在石墨烯的表面.实验中还探讨了氧化石墨烯的用量对复合材料光电性能的影响.实验结果证明氧化石墨烯的用量为10mg时,复合材料具有较好的光电活性(GR10-CdS).因此GR10-CdS修饰到导电玻璃表面作为光电化学传感器检测Cu2+,线性检测范围为10~80μmol/L,信噪比为3时传感器的检测限是9.5nmol/L,而且该光电化学传感器表现出很好的选择性.

Graphene-CdS nanocomposites were successfully prepared via one-step solvothermal method. TEM results proved that CdS were homogeneously dispersed on graphene sheets, which favorited the charge transport and separation. The controlled expriments proved that graphene-CdS nanocomposite/ITO electrode with 10 mg graphene oxide dosage exhibited the highest photocurrent. Therefore, a photoeleetrochemical sensor was developed to detected Cu2＋ using graphene-CdS/ITO elec- trode. The sensor exhibited good selectivity and linear relationship from 10 gmol/L to 80 gmol/L with detection limit of 9.5 nmol/L at a signal-to-noise （S/N） ratio of 3.