Journal
ANALYTICA CHIMICA ACTA
Volume 984, Issue -, Pages 86-95Publisher
ELSEVIER
DOI: 10.1016/j.aca.2017.06.043
Keywords
G-C3N4; TiO(2)nanosheets; Photoelectrochemical enzyme biosensor; Glucose oxidase
Categories
Funding
- National Natural Science Foundation of China [U1504215, 21576071]
- International Science and Technology Cooperative Project
- Scientific Research Foundation for the 46th Batch Returned Overseas Chinese Scholars, State Education Ministry
- Department of Science and Technology of Henan Province [172102410042]
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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. (C) 2017 Elsevier B.V. All rights reserved.
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