Study On The Discoloration Properties Of TiO₂/MoO₃ Composite Films

Electrochromic material is a new type of functional material.By applying voltage to this electrochromic material,it would continuously and reversibly change its optical properties.The quality of electrochromic materials can be measured in terms of switching time,reversibility and coloration efficiency.In order to prepare electrochromic materials with good electrochromic properties,the research object of this paper are TiO₂ nanowires,MoO₃ nanofilms and TiO₂/MoO₃ composite films.The research contents are as follows:TiO₂ nanowires were prepared on FTO glass by hydrothermal method.The formation of TiO₂ nanowires were confirmed by X-ray diffraction and scanning electronmicroscope.The electrochromic switching time,reversibility and coloration efficiency of the TiO2 nanowires were obtained by electrochemical measurement and spectral measurement.The electrochromic properties of the TiO₂ nanowires were analyzed.The effects of hydrothermal duration and annealing temperature on the electrochromic properties of TiO2 nanowires were studied.It was found that the TiO₂ nanowires hydrothermally grown for 8 hours,and then annealed at 250°C with the best electrochromic properties.MoO₃ nanofilms were prepared on FTO glass by electrochemical deposition method.The formation of MoO₃ films were confirmed by X-ray diffraction and scanning electronmicroscope.The electrochromic switching time,reversibility and coloration efficiency of the MoO₃ films were obtained by electrochemical measurement and spectral measurement.The electrochromic properties of the MoO3 films were analyzed.The effects of deposition cycle and annealing temperature on the electrochromic properties of MoO₃films were studied.It was found that the MoO₃ film deposition cycle for 16 cycles,and then annealed at 350°C with the best electrochromic properties.TiO₂ nanowires were prepared on FTO glass by hydrothermal method,and then the TiO2/MoO3 composite films were prepared through electrodepositing MoO3 coating onto TiO₂ nanowires.The formation of TiO₂/MoO₃ composite films were confirmed by X-ray diffraction,scanning electronmicroscope and diffuse reflectance spectroscopy.The electrochromic switching time,reversibility and coloration efficiency of the TiO2/MoO3composite films were obtained by electrochemical measurement and spectral measurement.The electrochromic properties of the TiO2/MoO3 thin films were also analyzed.The effects of different hydrothermal durations of TiO₂ nanowires and MoO₃ with different deposition cycles on the electrochromic properties of the composite TiO₂/MoO₃ thin films were investigated.The results showed that the hydrothermal growth of TiO2 nanowires for 6 hours then coating of MoO₃ with 6 deposition cycle had the best electrochromic properties.It was found that the electrochromic properties of TiO2/MoO3 composite films were significantly improved compared with single TiO₂ nanowires and MoO₃ films.