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Defect-Mediated Molecular Interaction and Charge Transfer in Graphene Mesh Glucose Sensors

Title
Defect-Mediated Molecular Interaction and Charge Transfer in Graphene Mesh Glucose Sensors
Author
박원일
Keywords
graphene; graphene mesh; enzymatic sensor; edge functionalization; multiple cycle operation
Issue Date
2017-04
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, v. 9, no. 16, page. 14216-14221
Abstract
We report the role of defects in enzymatic graphene field-effect transistor sensors by introducing engineered defects in graphene channels. Compared with conventional graphene sensors (Gr sensors), graphene mesh sensors (GM sensors), with an array of circular holes, initially exhibited a higher irreversible response to glucose, involving strong chemisorption to edge defects. However, after immobilization of glucose oxidase, the irreversibility of the responses was substantially diminished, without any reduction in the sensitivity of the GM sensors (i.e., -0.53 mV/mM for the GM sensor vs -0.37 mV/mM for Gr sensor). Furthermore, multiple cycle operation led to rapid sensing and improved the reversibility of GM sensors. In addition, control tests with sensors containing a linker showed that sensitivity was increased in Gr sensors but decreased in GM sensors. Our findings indicate that edge defects can be used to replace linkers for immobilization of glucose oxidase and improve charge transfer across glucose oxidase graphene interfaces.
URI
https://pubs.acs.org/doi/10.1021/acsami.7b00848https://repository.hanyang.ac.kr/handle/20.500.11754/113761
ISSN
1944-8244; 1944-8252
DOI
10.1021/acsami.7b00848
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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