Assembly of thermally reduced graphene oxide nanostructures by alternating current dielectrophoresis as hydrogen-gas sensors

Title
Assembly of thermally reduced graphene oxide nanostructures by alternating current dielectrophoresis as hydrogen-gas sensors
Authors
Jianwei WangBudhi SinghSunglyul Maeng,조한익Gil-Ho Kim
Keywords
Graphene oxide; Reduced graphene oxide; Hydrogen-gas sensor; Dielectrophoresis
Issue Date
2013-08
Publisher
Applied physics letters
Citation
VOL 103, NO 8, 083112-1-083112-5
Abstract
Chemo-resistive hydrogen-gas sensors based on thermally reduced graphene oxide (rGO) have been fabricated on a micro-hotplate by positive ac dielectrophoresis (DEP). The optimized DEP parameters for manipulating rGO nanostructures into Au electrodes for hydrogen sensing are: applied frequency = 1 MHz, peak-to-peak voltage = 5 V, and DEP time = 30 s. The device exhibits good sensitivity (~6%) with fast response time (~11  s) and recovery time (~36  s) for 200 ppm hydrogen gas at room temperature. This result indicates that the DEP process has great potential for assembling rGO for hydrogen-gas sensor in many industrial and scientific applications.
URI
http://pubs.kist.re.kr/handle/201004/45762
ISSN
00036951
Appears in Collections:
KIST Publication > Article
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