Abstract
Ceramic porous MgTiO3 materials have been prepared by classical solid-state route. The sintered pellets of MgTiO3 with different LiF contents were characterized for humidity-sensing application. The sintered disks of these mixtures were subjected to capacitance measurements at 20℃as function of the relative humidity from which revealed that the Mixture MgTiO3 + 2% LiF (w/w) has the better characteristics. The disks were subjected to DC resistance measurements as a function of relative humidity in the range 15% - 95% RH. The selectivity of this material was discussed and compared to commercial sensor results. The response and recovery characteristics were assessed.
Highlights
The use of sensors is well established in process Industries, agriculture, medicine, and many other areas, the development of new sensing materials with high sensing capabilities is proceeding with high rate
At 50% and 80% relative humidity (RH), the capacitance change was measured by scanning the measurement frequency between 60 Hz and 1 MHz
Sintered pellet of MgTiO3 mixed with 2% LiF (w/w) showed higher sensitivity compared to the other compositions in a wide range of RH (20% - 90% RH) and a reliable response time (150 seconds) for a percentage change in RH from 5% to 95%
Summary
The use of sensors is well established in process Industries, agriculture, medicine, and many other areas, the development of new sensing materials with high sensing capabilities is proceeding with high rate. The adsorption of water vapor enhances the surface electrical conductivity (impedance, capacitance, resistance) of ceramic metal oxides [6]. The humidity sensors normally exposed to water vapor, but to atmospheres containing various other components tend to lose their inherent humidity-sensitive properties during use due to several complicated physical and chemical processes between these components and various materials. The most promising approach seems to be to find a ceramic material with surface resistivity reversibly responsive to relative humidity (RH), which is not changed by repeated water vapor adsorption-desorption cycles and repeated heat-cleaning cycles at high temperatures, and selective to water vapor molecules
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