Abstract
Thermal stealth and camouflage technologies have been developed to blend objects with surroundings to counter infrared detection, and the emissivity modulation engineering for this purpose is more effective than the temperature control alone. Vanadium oxide (VO2) had abrupt changes of infrared (IR) transmission and IR emissivity across the metal-insulator transition at the temperature (Tc) of 68 °C. However, relatively high Tc and wide temperature hysteresis range, moderate IR emissivity modulation, and weak antioxidant ability for VO2 limited its practical applications. Herein, we reported a method for the synthesis of W/Al co-doped VO2 powders by sol-gel method combining with post-annealing, and then VO2 based thin films were obtained by vacuum filtration process. These results showed that W/Al co-doping successfully reduced the Tc and temperature hysteresis range to 43.8 °C and 7.5 °C, respectively. In addition, the IR emissivity decreased from 0.99 (room temperature) to 0.51 (90 °C) for W/Al co-doped VO2 films, and the emissivity modulation was effectively improved. Furthermore, the antioxidant ability of as-prepared VO2 nanoparticles was enhanced obviously by Al doping due to the generation of inert Al2O3 on its surface. Therefore, this work provided a novel route for preparing VO2 based infrared stealth materials which can be applied in infrared camouflage, sensors and smart windows.
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