Optical Switching and Color Changing Properties of VO2 Films on Muscovite Substrate

VO2 films on muscovite substrate were fabricated by inorganic sol-gel method and the following thermal treatment.The films were characterized by X-ray diffraction,scanning electron microscope(SEM),fourier transform infrared spectrophotometer(FTIR) and color difference(E*).The FTIR result shows that the film has an infrared transmittance switching efficiency of 77% in the metal-insulator transition.The color changing properties indicate that the film color reversibly changes from khaki to yellow-green as the temperature changes.The relationship between E* and the temperature presents a hysteresis loop,which is in accordance with the infrared optical switching properties.The maximum of E* during the film metal-insulator transition is 11.31.