Abstract
The nanocrystalline V2O5 thin films were prepared via a dip-coating method by controlled hydrolytic polycondensation of the vanadium (V) oxytriisopropoxide (VO(OC3H7)3) in isopropanol. For Ti doping, titanium (IV) isopropoxide (Ti(OC3H7)4) was used. The as-deposited films after thermal treatment at 500 °C under ambient air for 30 min were subjected to characterizations for their structural, morphological, and electrochromic properties. The X-ray diffraction (XRD) analyses of the films confirm an orthorhombic phase of vanadium pentaoxide (PDF # 41-1426), which is also supported by Fourier transform infrared (FTIR) analyses. The analyses of electrochromic properties of the films divulge that the 5 at% Ti-doped film has the fast switching time (coloration time: 0.59 s and bleaching time: 0.42 s), high net charge density and good electrochromic reversibility. The Nyquist impedance plots have been evaluated by fit and simulation analysis using Nova software, taking into account an equivalent electrical circuit model.
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