期刊
ACS APPLIED NANO MATERIALS
卷 4, 期 2, 页码 1976-1984出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.0c03333
关键词
carbon nanotube; graphical graphene; carbon hybrid; gas sensing phosphomolybdic acid; first principles
资金
- National Natural Science Foundation of China [61774063]
- Ministry of Science and Technology of the People's Republic of China [2019YFB2005700]
- Analytical and Testing Center at Huazhong University of Science and Technology
In this study, a carbon hybrid material was developed using PMA-decorated SWNTs and graphene as a gas sensing element and composite electrodes. The carbon hybrid demonstrated higher sensitivity, faster response time, and lower power consumption compared to previous oxide-modified CNT gas sensors. The improved gas sensitivity was attributed to the reduced Schottky barrier at the SWNT/graphene interface, allowing for a high response to the redox reaction between PMA and NH3 or NO2 molecules.
Low-dimensional materials such as carbon nanotubes (CNTs) are promising candidates for gas sensing. Surface modification with specific molecules is considered an effective approach to enhance gas sensing. In this work, a kind of carbon hybrid is fabricated with phosphomolybdic acid (PMA) molecule-decorated single-walled CNTs (SWNTs) as a gas-sensing element and chemical vapor deposition-grown graphical graphene on prepatterned copper and nickel films as composite electrodes. According to the experimental results of NH3 and NO2 detection, the PMA-decorated carbon hybrids present much higher sensitivity, faster response, and lower power consumption than other previously reported oxide-modified CNT gas sensors. Responses of the DC resistance variation of approximately 23 or -21% to 5 ppm NH3 or NO2 are demonstrated at room temperature, with a power consumption of only hundreds of nanowatts (nWs). The enhanced gas sensitivity of the carbon hybrid is described by the first-principles calculation of the energy band and Schottky barrier in hybrid structures from the interface perspective. A significant change in Fermi level in SWNTs due to PMA decoration reduces the Schottky barrier at the SWNT/graphene interface and allows the hybrid to function at an appropriate status, which corresponds to a high response to the redox reaction between PMA and NO2 or NH3 molecules.
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