石墨烯-CdTe量子点复合材料的电化学发光传感器研究

Electrochemicaluminescence sensor based on grapheme CdTe quantum dots nano-composite

以巯基丁二酸为修饰剂制备了CdTe量子点(CdTe QDs),采用微波辐射法还原氧化石墨且通过加入聚二烯丙基二甲基氯化铵(PDDA)得到带正电荷的石墨烯,并与带负电荷的CdTe QDs通过静电作用结合得到石墨烯-CdTe量子点复合材料(CdTe QDs/RGO-PDDA)复合物。研究了不同取样时间下CdTe QDs的电化学发光性能,并考察了扫描速度、共反应剂浓度和缓冲溶液pH值对CdTe QDs电化学发光强度的影响,通过对CdTe QDs/RGO-PDDA复合物电化学发光的研究,得出石墨烯的加入可以提高CdTe QDs电化学发光的强度和稳定性;最后基于CdTe QDs/RGO-PDDA构建了对Ag^+检测的电化学发光传感器,该传感器具有较强的抗干扰性,并得出线性回归方程为Y=10007.25-172.12X,线性回归系数R^2=0.9861。

CdTe quantum dots were synthesized using MPA（ mercaptosuccinic acid） as a modifier via a hydrothermal method. In addition,the positively charged graphene with PDDA was prepared with hydrazine hydrate as reductant by a microwave radiation method and CdTe QDs/RGO-PDDA composites were produced through electrostatic bonding effect between the negatively charged CdTe QDs and the positively charged graphene with PDDA. The electrochemiluminescence of CdTe QDs with different sampling time points and electrochemiluminescence mechanism of the QDs were studied,and the effects of scanning rate,concentration of co-reagent and pH of buffered solution were investigated. The results showed that the addition of graphene to CdTe QDs could improve the intensity and stability of electrochemiluminescence of CdTe QDs. The Ag^＋ detection electrochemiluminescence sensor was constructed based on CdTe QDs/RGO-PDDA composites and the equation of linear regression was Y = 10007. 25-172. 12 X and t linear regression coefficient R^2= 0. 9861.