The invention relates to a preparation method of a self-
assembly vanadium oxide film, and belongs to the field of inorganic semi-conductor functional materials. The preparation method comprises the following steps: carrying out ultrasonic cleaning on a substrate by utilizing an
acetone solution, then carrying out ultrasonic cleaning by utilizing deionized water, carrying out the ultrasonic cleaning by utilizing absolute ethyl
alcohol, and finally
drying; putting the dried substrate in an
octadecyltrichlorosilane-
toluene solution, then standing, and then irradiating the obtained substrate by
ultraviolet light; dissolving V2O5 and
ascorbic acid in water, and adding diluted HCl to regulate the pH value until a transparent clear blue solution A is formed; dissolving
cerium acetate and
ammonium paratungstate in the water, and adding the diluted HCl to regulate the pH value so as to form a solution B; mixing the solution A with the solution B, stirring while mixing, adding
polyethylene glycol, and then carrying out seal
ageing; putting the substrate irradiated by the
ultraviolet light into the solution subjected to seal
ageing, then taking out the processed substrate and
drying the processed substrate; and finally carrying out
thermal treatment in the presence of Ar gas. In the preparation method, the synthesis is carried out at a lower temperature, thereby avoiding the
toxicity of
vanadium oxide at a high temperature, simplifying the process flow of precursor preparation and being beneficial to environment conservation and health of operators.