Effect of Carbon Nanotubes on Direct Electron Transfer and Electrocatalytic Activity of Immobilized Glucose Oxidase

ACS Omega
Yuxiang LiuSan Ping Jiang

Abstract

Carbon nanotubes (CNTs) are excellent supports for electrocatalysts because of their large surface area, excellent electronic conductivity, and high chemical and structural stability. In the present study, the activity of CNTs on direct electron transfer (DET) and on immobilized glucose oxidase (GOX) is studied as a function of number of walls of CNTs. The results indicate that the GOX immobilized by the CNTs maintains its electrocatalytic activity toward glucose; however, the DET and electrocatalytic activity of GOX depend strongly on the number of inner tubes of CNTs. The GOX immobilized on triple-walled CNTs (TWNTs) has the highest electron-transfer rate constant, 1.22 s-1, for DET, the highest sensitivity toward glucose detection, 66.11 ± 5.06 μA mM-1 cm-2, and the lowest apparent Michaelis-Menten constant, 6.53 ± 0.58 mM, as compared to GOX immobilized on single-walled and multiwalled CNTs. The promotion effect of CNTs on the GOX electrocatalytic activity and DET is most likely due to the electron-tunneling effect between the outer wall and inner tubes of TWNTs. The results of this study have general implications for the fundamental understanding of the role of CNT supports in DET processes and can be used for the better d...Continue Reading

References

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Citations

Jul 12, 2019·Beilstein Journal of Nanotechnology·Giulia Lo DicoEduardo Ruiz-Hitzky
Mar 28, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Angela AleksovskaEvamarie Hey-Hawkins
Mar 2, 2021·Frontiers in Chemistry·Sooyoun Yu, Nosang V Myung

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Methods Mentioned

BETA
biosensors
transmission electron microscopy
biosensor

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