A Room-temperature Hydrogen Gas Sensor Using Palladium-decorated Single-Walled Carbon Nanotube/Si Heterojunction
Keywords:gas sensor, carbon nanotube, heterojunction
We report a room-temperature (RT) hydrogen gas (H2) sensor based on palladium-decorated single-walled carbon nanotube/Si (Pd-SWNTs/Si) heterojunction. The current-voltage (I-V) curves of the Pd-SWNTs/Si heterojunction in different concentrations of H2 were measured. The experimental results reveal that the Pd-SWNTs/Si heterojunction exhibits high H2 response. After exposure to 0.02 %, 0.05 %, and 0.1 % H2 for 10 min, the resistance of the heterojunction increases dramatically. The response is 122 %, 269 % and 457 %, respectively. A simple interfacial theory is used to understand the gas sensitivity results. This approach is a step toward future CNTs-based gas sensors for practical application.
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