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利用电沉积方法在玻碳电极表面制备了二氧化硅-壳聚糖(CHI)-氧化石墨烯(GO)-Ru(bpy)2+3复合膜,并采用扫描电子显微镜(SEM)技术、循环伏安法(CV)、电化学阻抗法(EIS)和电化学发光法(ECL)对修饰电极的性质进行了研究。结果表明,将壳聚糖和氧化石墨烯引入二氧化硅膜可以提高该膜的电子传递速度,且固定化的Ru(bpy)2+3在该膜中保持了良好的电化学活性。复合膜中固定化的Ru(bpy)2+3呈现出稳定的电化学发光信号。盐酸雷尼替丁对该电极的电化学发光信号有增敏作用,该增敏电化学发光信号与盐酸雷尼替丁的浓度的对数值在1.0×10-9~5.0×10-6mol/L范围内呈线性关系,相关系数r为0.9908,检出限为5×10-10mol/L。
Silica - chitosan (CHI) - graphene oxide (GO) - Ru (bpy) 2 + 3 composite films were prepared by electrodeposition on the surface of glassy carbon electrode. The scanning electron microscopy (SEM) The properties of the modified electrode were investigated by voltammetry (CV), electrochemical impedance spectroscopy (EIS) and electrochemical luminescence (ECL). The results show that the introduction of chitosan and graphene oxide into the silicon dioxide film can improve the electron transfer rate of the film, and the immobilized Ru (bpy) 2 + 3 maintains good electrochemical activity in the film. The immobilized Ru (bpy) 2 + 3 in the composite membrane showed a stable electrochemiluminescence signal. Ranitidine hydrochloride sensitized the electrochemical luminescence signal of the electrode. The logarithm value of the sensitized electrochemiluminescent signal and the concentration of ranitidine hydrochloride was 1.0 × 10 -9 -5.0 × 10 -6 mol / L Within the range of linear relationship, the correlation coefficient r is 0.9908, the detection limit is 5 × 10-10mol / L.