期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 290, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2022.126551
关键词
Graphene composite materials; Ultraviolet nanosecond pulsed laser; Surface modification; NO2 gas sensing; Response
资金
- Ministry of Science and Technology, Taiwan
- [MOST 109-2221-E-492-011]
- [110-2622-E-492-016]
- [110-2218-E-492-005-MBK]
The research utilized a nanosecond pulsed ultraviolet laser to modify graphene composite materials, leading to improved gas sensing response. The modified specimens showed a significant increase in response to NO2 gas, particularly at higher concentrations.
The nanosecond pulsed ultraviolet laser to modify the graphene composite materials (rGO/ZnO) and improve gas sensing response. The electrical resistance decreased from 2.72 x 103 to 1.13 x 103 omega/square. The XPS results revealed that the ratio of oxygen to carbon atoms decreased from 33.73 to 12.59%. The bonding structure indicated that the ratio of sp2 bonds of carbon atoms increased and that the sp2 bonds replaced the original sp3 bonds, yielding a material structure that is similar to a complete graphene structure. In the NO2 gas sensing experiment, tests were performed with 5 ppm concentration of NO2 standard gas. Compared with the specimens with rGO sensing materials, those with rGO/ZnO sensing materials could detect gas before laser surface modification. In the 5 ppm NO2 gas concentration, the rGO/ZnO sensing material had 4.2% gas response; after laser surface modification, the gas response with increased to 6.2%. Testing results for gas response under various NO2 standard gas concentrations after laser surface modification revealed that the specimen had a gas response of 11.0%, 14.8%, and 23.7% at the NO2 standard gas concentrations of 10, 30, and 50 ppm, respectively.
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