Ag-LaFeO3/NCQDs p-n heterojunctions for superior methanol gas sensing performance

[Display omitted] •The methanol gas sensing property of the nitrogen-doped quantum dot/Ag-LaFeO3 p-n heterojunction materials (NALPN) are advanced and the experimental findings are innovative.•The response of NALPN sensor to 5 ppm methanol is 73 and the maximum response to other gases is 5 at 92°C.•...

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Bibliographic Details
Published in:Materials research bulletin 2019-07, Vol.115, p.55-64
Main Authors: Rong, Qian, Zhang, Yumin, Li, Kejin, Wang, Huapeng, Hu, Jicu, Zhu, Zhongqi, Zhang, Jin, Liu, Qingju
Format: Article
Language:English
Subjects:
Gas sensor
Methanol
NALPN
Operating temperature
P-N heterojunction
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Summary:[Display omitted] •The methanol gas sensing property of the nitrogen-doped quantum dot/Ag-LaFeO3 p-n heterojunction materials (NALPN) are advanced and the experimental findings are innovative.•The response of NALPN sensor to 5 ppm methanol is 73 and the maximum response to other gases is 5 at 92°C.•The gas sensitivity test results show NALPN is a good gas-sensitive material with high response, low operating temperature and good selectivity to 5 ppm methanol gas. The unique electronic properties (electron mobility and carrier lifetime) are key factors for metal oxide semiconductor devices that directly determine the device's performance and application. Electron mobility of metal oxide semiconductor has a certain impact on response and operating temperature of gas sensor. Heterojunction composites of carbon quantum dots (CQDs) and perovskite materials have attracted much attention due to their great potential for gas sensors. In this paper, a gas sensor for monitoring methanol gas was developed based on nitrogen-doped carbon quantum dot/Ag-LaFeO3 (NCQDs/Ag-LaFeO3) p-n heterojunction materials (NALPN). NCQDS and Ag-LaFeO3 form a heterojunction, which improves the carrier transport ability and separation of electron-hole pairs. The surface of NCQDs contains COOH, optimize the selectivity of Ag-LaFeO3 to methanol gas. Gas sensitivity test results show that the NALPN to 5 ppm methanol gas possessed high response (73), low operating temperature (92 °C) and good selectivity. These excellent properties prove that NALPN materials are the main competitors for future gas sensitive materials.
ISSN:0025-5408
1873-4227
DOI:10.1016/j.materresbull.2019.02.033