Yellow Tungsten Oxide Nanocomposite Film

Yellow tungsten oxide nanocomposite film may be a nanocomposite film of polyainline (PANI) and tungsten trioxide (WO3), which may be fabricated by electropolymerization of aniline monomers onto WO3 coated ITO glass slides through spin coating technique and followed by annealing at 500 °C for 2h.

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The results confirm chemical interactions between the polymer matrix and the WO3 particles and reveal a well crystallized PANI/WO3 nanocomposite structure. The composite films show dual electrochromism at both positive and negative potentials arising from PANI and WO3, respectively. The coloration efficiency of the obtained composite film was much higher than that of WO3 and PANI thin film. The cyclic stability studies reveal that the composite films exhibit much more enhanced durability and-retain significant charge storage or discharge capacity after 1000 charge-discharge cycles. However, pure PANI loses most of the charge storage or discharge capacity after 350 cycles. The chemical bonding between PANI matrix and WO3 particles is believed to play an important role in enhancing the stability of the nanocomposite film.