Nano Archive

Simple graphene chemiresistors as pH sensors: fabrication and characterization

Lei, Nan and Li, Pengfei and Xue, Wei and Xu, Jie (2011) Simple graphene chemiresistors as pH sensors: fabrication and characterization. Measurement Science and Technology, 22 (10). p. 107002.

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Official URL: http://stacks.iop.org/0957-0233/22/i=10/a=107002

Abstract

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 kΩ pH −1 . The simple configuration, miniaturized size and integration ability make graphene-based sensors promising candidates for future micro/nano applications.

Item Type:Article
ID Code:11128
Deposited By:Prof. Alexey Ivanov
Deposited On:01 Nov 2011 23:22
Last Modified:02 Nov 2011 00:47

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