A TiO2 nanosheet-g-C3N4 composite photoelectrochemical enzyme biosensor excitable by visible irradiation

作者：Liu, Peipei; Huo, Xiaohe; Tang, Yunfei; Xu, Jun; Liu, Xiaoqiang^*; Wong, Danny K. Y.^*

来源：Analytica Chimica Acta, 2017, 984: 86-95.

DOI：10.1016/j.aca.2017.06.043

• G-C3N4
• TiO(2)nanosheets
• Photoelectrochemical enzyme biosensor
• Glucose oxidase

In this work, g-C3N4 and TiO2 nanosheets were synergistically employed as a novel composite for developing a scaffold of a photoelectrochemical enzyme biosensor. In this way, we have improved the poor visible light excitation of TiO2 and retarded the photo-generated charge recombination on g-C3N4 to achieve an enhanced response at the photoelectrochemical biosensor, compared to that generated by the corresponding biosensors consisting of each individual component. Using glucose oxidase as a model enzyme, the biosensor was demonstrated to show strong visible light activity towards the enzyme mediated glucose oxidation. We have also observed a 350% enhanced photocurrent compared to that at a g-C3N4 based ITO electrode. In addition, the high specific surface area and excellent biocompatibility of TiO2 nanosheets have also positively contributed to the performance of the photoelectrochemical enzyme biosensor with a 0.05-16 mM linear range and a 0.01 mM glucose detection limit.

• 出版日期2017-9-1
• 单位河南大学