Effect of Pore Structures on the Humidity Sensitivity of TiO2-Based Ceramic Humidity Sensors

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TiO2-based ceramic humidity sensors containing small amounts of Li2O and V2O5 were prepared by a solid-reaction method. The relationship between the pore structures of the sensors and one of the most important humidity properties, hysteresis in humidity sensitivity, was studied. The humidity sensitivity was investigated by measuring the impedance of the sensors under various conditions of humidity, and the pore-size distribution was measured by mercury-intrusion porosimetry and by the nitrogen-adsorption method. The hysteresis property of the sensors was shown to be significantly dependent on their microstructure, particularly the volume ratio of mesopores to all pores in the sensor elements. Nitrogen adsorption was found to be more useful than mercury porosimetry for determining the proportion of mesopores in the samples.

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Periodical:

Edited by:

Kazumi Kato, Tadashi Takenaka, Masasuke Takata and Kazuo Shinozaki

Pages:

285-288

DOI:

10.4028/www.scientific.net/KEM.388.285

Citation:

H. Aoki et al., "Effect of Pore Structures on the Humidity Sensitivity of TiO2-Based Ceramic Humidity Sensors", Key Engineering Materials, Vol. 388, pp. 285-288, 2009

Online since:

September 2008

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$35.00

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