Assembly of thermally reduced graphene oxide nanostructures by alternating current dielectrophoresis as hydrogen-gas sensors
- Assembly of thermally reduced graphene oxide nanostructures by alternating current dielectrophoresis as hydrogen-gas sensors
- Jianwei Wang; Budhi Singh; Sunglyul Maeng,; 조한익; Gil-Ho Kim
- Graphene oxide; Reduced graphene oxide; Hydrogen-gas sensor; Dielectrophoresis
- Issue Date
- Applied physics letters
- VOL 103, NO 8, 083112-1-083112-5
- 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.
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