Abstract
The Co-doped α-MoO3 with thermochromism and variable infrared emissivity were prepared. The defects in the crystal structures and the regulatory mechanism of local defects on band gap width and conductivity were further investigated. The Co-doped α-MoO3 samples from different heating atmosphere were designed to study the influences of oxygen vacancy on thermochromism and infrared emissivity. Concentration of oxygen vacancy determines optical absorption/reflectivity and conductivity. Results show that the Co-doped α-MoO3 sample prepared by thermal treatment at 500 °C in argon atmosphere owns appropriate oxygen vacancy, reflectivity and conductivity, rich colorful change and strong infrared radiation regulation. Color can reversibly change from purple to yellow-green, and the effective infrared emissivity is regulated to 0.242 at 3–5 μm. It indicates a new strategy to enhance high temperature thermochromism and variable infrared emissivity by ion doping.
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