Hefei Research Institute Makes Progress in the Research of Vanadium Dioxide Thermally Induced Phase Change Nanomaterials
Recently, researcher Li Guanghai, researcher at the Institute of Solid State Physics, Institute of Solid State Physics, Chinese Academy of Sciences, made progress in the research of M-phase VO2 (VO2(M)) thermally induced phase change nanomaterials. The relevant research work was published in the form of a back cover article on "Chem. A Euro. J. 22 (2016) 17627) and was granted a national invention patent (ZL201310384430.3).
VO2(M) nanomaterials have reversible metal-semiconductor phase transitions. Due to abrupt changes in the optical and electrical properties of the materials before and after phase transformation, they have important application prospects in the fields of optoelectronic devices, infrared detection, and smart windows. Therefore, the development of low-cost and controllable preparation technology is of great significance for realizing the industrialization and application of VO2(M) nanomaterials.
Dr. Li Guanghai, Ph.D., developed a method to directly prepare high-quality amorphous VO2 colloids using anodized metal vanadium. The obtained colloids not only have good dispersion, good film-forming properties, but also have high anti-oxidation capability. Amorphous VO2 colloids can be directly converted to VO2(M) nanoparticles by means of low-temperature, rapid heat treatment in air. The prepared VO2 (M) nanoparticle film has good thermochromic and thermistor properties, and the conductivity change before and after the phase change reaches the order of 5×10 4 , and the integral transmittance of sunlight and the integral transmittance of visible light can reach respectively. 9.4% and 40.7%. It is worth mentioning that the preparation of amorphous VO2 colloids sprayed on the preheated glass can be directly prepared VO2 (M) thermochromic film, laid a certain material basis for the scale of VO2 (M) preparation and practical application.
The research was funded by the National Natural Science Foundation of China (51372250 and 51402304).
Left: Transmission spectra of VO2 (M) nanoparticle films of different thickness: (1) 160 (2) 230 and (3) 420 nm. Right: VO2 (M) nanoparticle film sheet resistance-temperature curve.
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