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Gas Sensing Properties of Cobalt Titanate with Multiscale Pore Structure: Experiment and Simulation

College of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
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Sensors 2020, 20(6), 1787; https://doi.org/10.3390/s20061787
Received: 2 March 2020 / Revised: 19 March 2020 / Accepted: 20 March 2020 / Published: 24 March 2020
(This article belongs to the Special Issue Gas Sensing Materials)
A diffusion-reaction coupled model was presented to investigate the effects of multiscale pore structure characteristics on gas sensing properties. A series of CoTiO3 powders with different pore size distributions were fabricated by sol-gel method. Experimental results on cobalt titanate thick films show that a well-defined multiscale pore structure is particularly desired for the improvement of sensing performance, instead of just increasing the specific surface area. The theoretical responses of sensing elements with different pore size distributions were derived and compared with experimental data on CoTiO3 sensors exposed to ethanol. The calculated sensitivities considering the influence of pore size changes were also found to be in agreement with the experimental results. A dimensionless Thiele modulus Th was introduced for assessing the critical point corresponding to the transformation from surface reaction-controlled sensitivity into diffusion-controlled sensitivity. View Full-Text
Keywords: gas sensors; diffusion-reaction model; multiscale pore structure; cobalt titanate; control mechanism gas sensors; diffusion-reaction model; multiscale pore structure; cobalt titanate; control mechanism
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Li, M.; Wang, B.; Tao, A.; Li, S. Gas Sensing Properties of Cobalt Titanate with Multiscale Pore Structure: Experiment and Simulation. Sensors 2020, 20, 1787.

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