TiO2-BiVO4异质结复合材料的制备及其在光电化学生物传感器中的应用

摘要

以异丙醇钛为钛源,采用溶胶-凝胶法(Sol-Gel)制备二氧化钛(TiO2)微球,然后以水热法制备出TiO2微球与钒酸铋(BiVO4)的异质结复合纳米材料,通过X射线衍射(XRD)、扫描电子显微镜(SEM)和X射线光电子能谱(XPS)对复合纳米材料进行表征.并利用时间-电流(I-T)曲线研究了材料的光电性能.由于BiVO4的禁带间隙较窄,从而提高了所得复合材料在可见光区的光电性能.将所制备的TiO2-BiVO4异质结作为支架负载葡萄糖氧化酶(GOx),进而制备出光电化学葡萄糖传感器,该传感器表现出良好的灵敏度,其线性范围为0.05~8 mmol/L,检测限为0.02 mmol/L.%A novel TiO2nanosphere-BiVO4heterostructure was prepared via a combined sol-gel and hydrothermal method.The nanocomposite was characterized by XRD,SEM and XPS.The photoelectro-chemical(PEC)property of the composite was improved compared with the pure TiO 2under visible-light irradiation due to the small energy gap of BiVO 4.The PEC glucose oxidase(GOx)sensor based on the composite exhibited a wide linearity(0.05-8 mmol/L)and a low detection limit of(0.02 mmol/L)for glucose.