HUMIDITY SENSING PROPERTIES OF BORON PHOSPHATE

A systematic study of the humidity sensing properties of boron phospha te indicates promise as a humidity sensing material. A resistance chan ge from 10(11) to 10(6) Omega with change in relative humidity from 35 to 90% with a superior slope indicates high sensitivity and this alon g with the linear behavior suggests its applications in this humidity range. Morphological characterization using scanning electron microsco py suggests the importance of grain size in controlling the sensitivit y. In boron phosphate, humidity sensitivity largely depends on the opt imization of the preparation parameters and more significantly the var iation of boron/phosphorus ratio. (C) 1998 Elsevier Science S.A. All r ights reserved.