Experimental And Theoretical Study On The Vanadium Oxide Thin Films With Two Dimensional Ordered Microstructure

Vanadium oxide have received extensive attention due to their special properties such as thermal induced phase transition, and it has been applied in the fields of optoelectronic devices, lubrication, sensors, heterogeneous catalysis and so on. At present, the application of microstructure technology to improve the performance of vanadium oxide materials has become a major research direction. In view of the current research work is focused on the size of nano materials, relatively few studies on submicron materials. Therefore, this paper investigated the fabrication of vanadium oxide thin films with submicron ordered structure, the study of the optical properties and morphology characteristics, and calculation of the optical properties of vanadium oxide particles with submicron size using the discrete dipole approximation (DDA) theory.The main work of this paper is making a large area of the monolayer polystyrene microspheres mask on the surface of clean glass substrates by the floating-transferring. The thin film of metal vanadium were prepared on the mask by radio frequency magnetron sputtering. The mask plate is removed by annealing in air environment. At the same time, the vanadium oxide thin films were oxidized and the morphology was improved, and the order micro structure of the vanadium oxide was obtained.The appearance of the morphology of the sample has been observed by scanning electron microscopy (SEM), which is shown that the array structure of vanadium oxide grew on the polystyrene sphere (PS) pellets. The fiber-optic spectrometer was used to characterize the optical properties of the samples. It confirmed that some samples have been shown thermally induced variations of optical transmittance. The samples were sputtered in room temperature has the largest rate of variation. At the wavelength of 800nm, the transmittance varies from 76.53% at 30 to 72.05% at 90℃, a decline of 4.48%.The DDA theory is also used to simulate the transmission dependence wavelength curves of vanadium oxide particles of three prismatic shape and cylindrical shape. The effects of ambient temperature and particle size on the optical properties are analyzed and explained.