Journal
MEASUREMENT SCIENCE AND TECHNOLOGY
Volume 22, Issue 10, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-0233/22/10/107002
Keywords
graphene; pH; sensor; focused ion beam
Funding
- Washington State University Vancouver (WSUV)
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We report the fabrication and characterization of a simple gate-free graphene device as a pH sensor. The graphene sheets are made by mechanical exfoliation. Platinum contact electrodes are fabricated with a mask-free process using a focused ion beam and then expanded by silver paint. Annealing is used to improve the electrical contact. The experiment on the fabricated graphene device shows that the resistance of the device decreases linearly with increasing pH values (in the range of 4-10) in the surrounding liquid environment. The resolution achieved in our experiments is approximately 0.3 pH in alkali environment. The sensitivity of the device is calculated as approximately 2 k Omega pH(-1). The simple configuration, miniaturized size and integration ability make graphene-based sensors promising candidates for future micro/nano applications.
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