Abstract
PVA films containing 12-tungstogermanic heteropoly acid have been successfully prepared for the first time. Infrared (IR) spectra revealed that the Keggin structure characteristic of the GeW 12O 40 4− anion was present in the PVA films. The characteristic IR peaks have been identified and their change in wave number interpreted as a function of heteropoly acid (HPA) content. The film exhibited considerably high proton conductivity, which increased with the increase of the 12-tungstogermanic heteropoly acid content. At room temperature (20°C), the conductivity of the PVA film containing 80 wt.% 12-tungstogermanic heteropoly acid is 2.11×10 −2 S cm −1. The photochromism of the PVA film was observed. Its color changed into blue.
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