A series of tungstophosphate, tungstosilicate acid/polyvinyl alcohol complexs were prepared. Their properties were investigated by IR, UV, TG-DTA and conductivity measurement.The results showed that heteropolyacid had different photochromic properties in solution and thin films. The complexes thin films were proton conductors. Their conductivities increased when relative humidity increased and decreased when photochromism occurred in the thin films.
