Humidity Sensor Using A Mixture of Ammonium Paratungstate Pentahydrate and Aluminium Sulphate

Studies on ceramics for use as humidity sensors have been a ?eld of research for the last two decades. Porous ceramics have been investigated and used as humidity sensors for consistency and durability. In particular, ammonium paratungstate pentahydrate (APT.5H2O) has consolidated its position as a humidity sensing material  and a humidity sensor. On the other hand, recent studies on aluminium sulphate, Al2(SO4)3.16H2O also enhance the possibility of its use as a humidity sensor. Here, the humidity dependency of the AC electrical conductance Cast Iron Inserts of thick ?lms of APT mixed with aluminium sulphate in different proportions is investigated. The response time of the sensor is also measured. The SEM and XRD studies on the sample are carried out in order to know the structure of the samples and to identify the constituents of the samples. The results are presented and discussed in this paper.
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