Abstract
Sol–gel processed Al 2O 3 thick film template has been tested for the first time to fabricate a trace moisture sensor. The device consists of a thick film nano porous γ-Al 2O 3 film, electrodes coated by silver palladium (AgPd) conductive past on both sides of the film forming a parallel plate capacitor. A high change in capacitance was observed with increasing ppmV moisture level from 0 to 100 ppmV. The results show that sol–gel processed monoliths are promising materials for capacitive type trace moisture sensor.
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