▎ 摘　　要

NOVELTY - Preparation of titanium dioxide nanofiber aerogel involves adding polyacrylonitrile to mixed solvent (A), stirring, adding tetrabutyl titanate, ultrasonically treating to obtain a uniform colloid, adding urea to adjust the pH of the colloid to 7.5-9, spin coating the aged colloid on the surface of a glass substrate to obtain a film, drying to obtain a titanium dioxide nanofiber film, adding tetraethyl orthosilicate to mixed solvent (B), ultrasonically stirring, adding phosphoric acid and stirring for 2-4 hours, cutting the nanofiber film obtained into small pieces, adding into deionized water and stirring vigorously for 20-30 minutes, adding silica sol and graphene oxide, stirring, pouring the mixture into a mold, freeze-drying to obtain nanofibers aerogel precursor, washing, drying, taking out and placing in a tube furnace, passing in a mixture of hydrogen and nitrogen gas in a volume ratio of 30:70%, and heating from room temperature, calcining and cooling. USE - Preparation of titanium dioxide nanofiber aerogel. ADVANTAGE - The method produces aerogel having excellent conductivity and mechanical property. DETAILED DESCRIPTION - Preparation of titanium dioxide nanofiber aerogel involves adding polyacrylonitrile to mixed solvent (A), stirring for 0.5-1 hour, adding tetrabutyl titanate, ultrasonically treating to obtain a uniform colloid, adding urea to adjust the pH of the colloid to 7.5-9, leave still for 1-5 hours, spin coating the aged colloid on the surface of a glass substrate to obtain a film with a thickness of 50-200 mu m, drying with hot air to obtain a titanium dioxide nanofiber film, adding tetraethyl orthosilicate to mixed solvent (B), ultrasonically stirring uniformly, adding phosphoric acid and mixing and stirring for 2-4 hours, cutting the nanofiber film obtained into small pieces, adding into deionized water in the mass ratio of 1:90-96 and stirring vigorously for 20-30 minutes, adding silica sol and graphene oxide, stirring at room temperature for 2-3 hours, pouring the mixture into a mold, freeze-drying in liquid nitrogen environment for 50-60 hours to obtain nanofibers aerogel precursor, washing the nanofiber aerogel with hydrochloric acid, drying, taking out and placing in a tube furnace, passing in a mixture of hydrogen and nitrogen gas in a volume ratio of 30:70%, flow rate of 3 L/minute, and heating from room temperature, calcining at 650-750 degrees C for 1.5-2 hours and cooling. The mass-volume ratio of polyacrylonitrile, mixed solvent (A) and tetrabutyl titanate is 2-5 g:100 mL:10-30 g. The mass ratio of tetraethyl orthosilicate to phosphoric acid is (4-5):(0.02-0.04).