Recently, researchers from the Institute of Solid State Physics, Institute of Solid State Physics, Chinese Academy of Sciences, have made new progress in the research of infrared modulation of thermally induced phase change vanadium dioxide nanomaterials. By compounding vanadium dioxide with a transparent conductive material, active and dynamic control of infrared light transmittance is achieved. In order to solve the problem that the vanadium dioxide phase transition temperature is too high, a new research idea is provided. The transparent conductive material is introduced into the thermochromism research field, and the application range of the transparent conductive material is expanded. Vanadium dioxide is a transition metal oxide with thermally induced phase transition characteristics. It has semiconducting properties and high infrared transmittance below the phase transition temperature, while it has metallic properties and high infrared light above the phase transition temperature. Reflectivity. This phase change characteristic makes vanadium dioxide can be used as intelligent energy-saving window coating material, and regulates the indoor temperature through the regulation of infrared light, thereby reducing the building energy consumption and achieving the purpose of energy saving. High temperature of phase transition, low visible light transmittance, and small control of infrared light are three key factors restricting the practical application of vanadium dioxide. In response to the above problems, the researchers used transparent conductive materials with high optical transmittance and excellent electrical and thermal conductivity, composited vanadium dioxide nanoparticles with ITO transparent conductive material, and used Joule heat induced ITO produced under applied electric field to induce vanadium dioxide. Phase transitions have enabled the active control of infrared light transmittance (Figure 1), and the dynamic control of infrared light transmittance has been achieved through the application of alternating electric fields (Figure 2). The research results are expected to find applications in switching devices, infrared anti-counterfeiting and infrared stealth. The related research results are published in J. Mater. Chem. C, 4 (2016) 1579) under the title Active and dynamic infrared switching of VO2 (M) nanoparticle film on ITO glass. The research work was supported by the National Natural Science Foundation of China and the Natural Science Foundation of Anhui Province.
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