Porous Ceramic Humidity Sensors Using Sol-Gel Processed ZrTiO₄ Nanoparticles

Abstract:

Ceramic ZrTiO4 powders were prepared by a sol-gel method using zirconium oxychloride and titanium tetraisopropoxide. In situ high temperature X-ray diffraction results show that crystallization of the amorphous gel starts at 400°C. Single-phase ZrTiO4 nanoparticles of 46 nm average particle size, determined by nitrogen adsorption analysis, were obtained after heat treatment at 450°C for 1 h. After pressing these sinteractive powders, pellets with controlled pore size distribution were obtained by sintering at temperatures as low as 400°C. The analysis of pores by mercury porosimetry gives an average porosity of 45%. The electrical resistivity, determined by impedance spectroscopy measurements at 24°C under different humidity environments, shows the ability of these pellets to adsorb water vapor in the porous surfaces.

• Periodical: Advances in Science and Technology (Volume 45)
• Pages: 1803-1808
• DOI: https://doi.org/10.4028/www.scientific.net/AST.45.1803
• Online since: October 2006
• Authors: Ivana Conte Cosentino, E.N.S. Muccillo, Flávio M. Vichi, R. Muccillo
• Keywords: Porous Ceramics, Sol-Gel Process, Zirconia-Titania

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