A novel Ni-orsanometallic polymer as sensitive membrane in Surface Acoustic Wave (SAW) humidity sensors

摘要

The response of polymer coated surface acoustic wave (SAW) device to relative humidity (RH) adsorption is here examined.The sensitive membrane is a novel polymer, POLY(BIS-TRIBUTHYLPHOSPHINE-Ni-DIETHYNYLBIPHENYL), Ni-DEBP, prepared by catalitic dehydroalogenation reaction of the corresponding Ni(Ⅱ) dichloride and p-diethynyibiphenyl in basic solvents. The polymer is soluble in toluene and in THF (tetrahydrofuran), it is sensitive to water vapour and insoluble in water. The Ni-DEBP based SAW sensor shows fast and reversible responses at RH values that can not be detected by the use of a commercial humidity sensor.