ZnO-nanorods/graphene heterostructure: a direct electron transfer glucose biosensor
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AbstractZnO-nanorods/graphene heterostructure was synthesized by hydrothermal growth of ZnO nanorods on chemically reduced graphene (CRG) film. The hybrid structure was demonstrated as a biosensor, where direct electron transfer between glucose oxidase (GOD) and electrode was observed. The charge transfer was attributed to the ZnO nanorod wiring between the redox center of GOD and electrode, and the ZnO/graphene heterostructure facilitated the transport of electrons on the hybride electrode. The glucose sensor based on the GOD-ZnO/CRG/Pt electrode had a high sensitivity of 17.64 mu A mM(-1), which is higher than most of the previously reported values for direct electron transfer based glucose biosensors. Moreover, this biosensor is linearly proportional to the concentration of glucose in the range of 0.2-1.6 mM. The study revealed that the band structure of electrode could affect the detection of direct electron transfer of GOD, which would be helpful for the design of the biosensor electrodes in the future.
All Author(s) ListYu Zhao, Wenbo Li, Lijia Pan, Dongyuan Zhai, Yu Wang, Lanlan Li, Wen Cheng, Wei Yin, Xinran Wang, Jian-Bin Xu, Yi Shi
Journal nameScientific Reports
Year2016
Month8
Volume Number6
Article number32327
ISSN2045-2322
eISSN2045-2322
LanguagesEnglish-United States

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