Comparative Studies on Electronic and Gas-Sensing Properties of Rare Earth (Y, La, Pr, Tb and Er) Doped Sno2 Nanostructures
A variety of rare earths (REs, including Y, La, Pr, Tb and Er)-doped SnO2 materials has been synthesized by a solvothermal method and was used for gas sensors for detecting different gases. The effects of RE doping on structural, electronic and gas-sensing properties of SnO2 have been investigated by DFT calculation and electrochemical method. According to a comparative study on gas-sensing properties of the RE-doped SnO2 gas sensors to various testing gases, RE-doped SnO2 sensors showed enhanced sensitivity to different testing gases. Especially, the Pr-doped SnO2 sensor exhibited outstanding sensing properties to SO2 , including a high response of 19.5 to 50 ppm SO2 , excellent selectivity, repaid response and recovery rates and superior long-term stability. The improved electron excitation efficiency endowed RE-SnO2 with a high density of free electrons that can be trapped by atmosphere oxygen at oxygen vacancies site and participate in the SO2-sensing reactions. Moreover, the enhanced charge carrier transport properties, including prolonged electron lifetime, improved electron diffusion coefficient and increased effective diffusion length, after RE doping were revealed by electrochemical measurement and were conducive to improving SO2-sensing properties of the RE-SnO2 sensors
Year of publication: |
[2022]
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Authors: | Xu, Haoyuan ; li, jianzhong ; Li, Peidong ; Shi, Junjie ; Gao, Xuanwen |
Publisher: |
[S.l.] : SSRN |
Saved in:
freely available
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