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Article

Acetone Sensing Properties and Mechanism of SnO2 Thick-Films

by 1,2, 1,*, 1, 1 and 1,*
1
School of Physics, State Key Laboratory for Crystal Materials, Shandong University, Jinan 250100, China
2
School of Science, Shandong Jianzhu University, Jinan 250101, China
*
Authors to whom correspondence should be addressed.
Sensors 2018, 18(10), 3425; https://doi.org/10.3390/s18103425
Received: 1 September 2018 / Revised: 7 October 2018 / Accepted: 7 October 2018 / Published: 12 October 2018
(This article belongs to the Special Issue VOC Sensors Applicable to IoT and Healthcare)
In the present work, we investigated the acetone sensing characteristics and mechanism of SnO2 thick-films through experiments and DFT calculations. SnO2 thick film annealed at 600 °C could sensitively detect acetone vapors. At the optimum operating temperature of 180 °C, the responses of the SnO2 sensor were 3.33, 3.94, 5.04, and 7.27 for 1, 3, 5, and 10 ppm acetone, respectively. The DFT calculation results show that the acetone molecule can be adsorbed on the five-fold-coordinated Sn and oxygen vacancy (VO) sites with O-down, with electrons transferring from acetone to the SnO2 (110) surface. The acetone molecule acts as a donor in these modes, which can explain why the resistance of SnO2 or n-type metal oxides decreased after the acetone molecules were introduced into the system. Molecular dynamics calculations show that acetone does not convert to other products during the simulation. View Full-Text
Keywords: gas sensors; acetone; SnO2; sensing mechanism gas sensors; acetone; SnO2; sensing mechanism
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MDPI and ACS Style

Chen, Y.; Qin, H.; Cao, Y.; Zhang, H.; Hu, J. Acetone Sensing Properties and Mechanism of SnO2 Thick-Films. Sensors 2018, 18, 3425. https://doi.org/10.3390/s18103425

AMA Style

Chen Y, Qin H, Cao Y, Zhang H, Hu J. Acetone Sensing Properties and Mechanism of SnO2 Thick-Films. Sensors. 2018; 18(10):3425. https://doi.org/10.3390/s18103425

Chicago/Turabian Style

Chen, Yanping, Hongwei Qin, Yue Cao, Heng Zhang, and Jifan Hu. 2018. "Acetone Sensing Properties and Mechanism of SnO2 Thick-Films" Sensors 18, no. 10: 3425. https://doi.org/10.3390/s18103425

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