METHOD OF PRODUCING NANOWIRES CONTAINING MIXTURE OF PENTAOXIDE AND VANADIUM DIOXIDE Russian patent published in 2024 - IPC D01D5/06 D01D5/12 C01G31/02 B82Y40/00 

FIELD: chemistry.

SUBSTANCE: invention relates to chemical industry and nanotechnology. Solution of vanadium pentoxide and polymer are prepared in two steps. At the first stage vanadium pentoxide powder is dissolved in hydrogen peroxide, for which 36.5 mg of vanadium pentoxide per 1 ml of hydrogen peroxide are taken. Obtained solution is filtered. At the second stage, high-molecular polyvinylpyrrolidone is added to said solution in amount of 0.12–0.20 g per 1 ml of the solution. Then electrospinning of prepared solution is carried out at constant voltage of 12–18 kV. To obtain a mixture of pentaoxide and vanadium dioxide, the nanowires obtained by electrospinning are annealed in two steps: at the first stage, in an air medium at temperature of 370–420 °C not less than 60 minutes, and on the second – in an inert medium in the presence of oxalic acid at temperature of 530–570 °C not less than 60 minutes.

EFFECT: invention not only enables to obtain nanowires containing a mixture of pentaoxide and vanadium dioxide, but also to adjust the ratio of these oxides by changing the amount of oxalic acid at the second annealing step.

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