Investigation of Direct Electron Transfer of Glucose Oxidase on a Graphene-CNT Composite Surface: A Molecular Dynamics Study Based on Electrochemical Experimentsopen access
- Authors
- Yoon, Taeyoung; Park, Wooboum; You, Juneseok; Na, Sungsoo
- Issue Date
- Jul-2024
- Publisher
- MDPI
- Keywords
- direct electron transfer; glucose oxidase; graphene; carbon nanotube electrochemistry; enzyme coating; molecular dynamics
- Citation
- NANOMATERIALS, v.14, no.13
- Journal Title
- NANOMATERIALS
- Volume
- 14
- Number
- 13
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/28855
- DOI
- 10.3390/nano14131073
- ISSN
- 2079-4991
- Abstract
- Graphene and its variants exhibit excellent electrical properties for the construction of enzymatic interfaces. In particular, the direct electron transfer of glucose oxidase on the electrode surface is a very important issue in the development of enzyme-based bioelectrodes. However, the number of studies conducted to assess how pristine graphene forms different interfaces with other carbon materials is insufficient. Enzyme-based electrodes (formed using carbon materials) have been extensively applied because of their low manufacturing costs and easy production techniques. In this study, the characteristics of a single-walled carbon nanotube/graphene-combined enzyme interface are analyzed at the atomic level using molecular dynamics simulations. The morphology of the enzyme was visualized using an elastic network model by performing normal-mode analysis based on electrochemical and microscopic experiments. Single-carbon electrodes exhibited poorer electrical characteristics than those prepared as composites with enzymes. Furthermore, the composite interface exhibited 4.61- and 2.45-fold higher direct electron efficiencies than GOx synthesized with single-carbon nanotubes and graphene, respectively. Based on this study, we propose that pristine graphene has the potential to develop glucose oxidase interfaces and carbon-nanotube-graphene composites for easy fabrication, low cost, and efficient electrode structures for enzyme-based biofuel cells.
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