Abstract
Thick film ceramic humidity sensitive layers composed of the Zn 2SnO 4–LiZnVO 4 system were sintered using nanometer powders. The humidity sensitive powders prepared by the sol–gel route have the advantages of lower resistance in the low relative humidity (RH) range, better resistance-RH linearity and long-term stability compared with layers sintered from conventional solid state reaction powders. The impedance measurements at different operation frequencies indicate that the sensors sintered at 900 °C for 1 h have an optimum resistance-RH linearity at 1 kHz. scanning electron microscopy (SEM) micrographs of the grain structures and complex impedance analysis confirm that high performance of the sensitive layer is associated with a fine microstructure morphology, which is characterized by suitable rod shaped grains forming mesopores and by well distributed LiZnVO 4 additives, forming a thin glassy surface covering.
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