Preparation and properties of polyaniline and tungsten oxide dihydrate dual-band electrochromic composite films
Polyaniline(PANI),a polymer material exhibiting exceptional electrical conductivity,has garnered widespread application in electrochromic devices and supercapacitors.While PANI effectively demonstrates an electrochromic effect within the visible light band(400-780 nm),its adjustability in the near-infrared band(above 780 nm)remains limited.Consequently,its temperature control capabilities require enhancement.To address this,tungsten oxide dihydrate(WO3·2H2O),a cathode discoloration material,was integrated with PANI to bolster its ability to regulate light transmittance in the near-infrared band.In this study,the WO3·2H2O@PANI composite film was fabricated utilizing the spin-coating method,and its surface morphology and electrochromic properties were thoroughly examined.Our findings reveal that the electrochromic performance of the WO3·2H2O@PANI composite film has been significantly improved in the near-infrared band.Furthermore,it exhibits a stronger bonding force with the ITO glass surface,thereby enhancing both its electrochemical and optical stability.
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