▎ 摘　　要

NOVELTY - Preparing graphene/nanosilver based cellulose substrate conductive film involves cutting the dried oil-tea shell into small sections, adding to the mixed solution of sodium hydroxide and sodium sulfite, heating to 85-90 degrees C for 90 minutes to obtain holo-cellulose, adding to the potassium hydroxide solution, heating to 70-80 degrees C and reacting for 90 minutes to obtain cellulose, dispersing in the distilled water, adding proper amount of hydrogen peroxide solution and bleaching to obtain cellulose whisker substrate. The obtained product is dispersed in the distilled water. USE - Method for preparing graphene/nanosilver based cellulose substrate conductive film. ADVANTAGE - The method enables to prepare graphene/nanosilver based cellulose substrate conductive film in simple, cost-effective and eco-friendly manner, has oil-tea shell with high additional value that improves the national oil tea planting, and has good performance. DETAILED DESCRIPTION - Preparing graphene/nanosilver based cellulose substrate conductive film involves cutting the dried oil-tea shell into small sections, adding to the mixed solution of sodium hydroxide and sodium sulfite, heating to 85-90 degrees C for 90 minutes to obtain holo-cellulose, adding to the potassium hydroxide solution, heating to 70-80 degrees C and reacting for 90 minutes to obtain cellulose, dispersing in the distilled water, adding proper amount of hydrogen peroxide solution and bleaching to obtain cellulose whisker substrate. The obtained product is dispersed in the distilled water, added a certain amount of oxalic acid, heated to 90-100 degrees C for 100 minutes and transferred to the centrifugation. The distilled water is added to the obtained product, collected the light blue suspension supernatant, carried out ultrasonic dispersion treatment to obtain oil tea fruit cellulose whisker suspension, filtered under vacuum to obtain substrate film. The improved Hummers method is used to prepare graphene oxide, dispersed in the de-ionized water to obtain oxidized graphene aqueous solution, subjected to the ultrasonic stripping and centrifugation treatment, treated with hydrazine hydrate at volume ratio of 100:0.15-0.2 and adjusted the pH to 10. The obtained product is stirred uniformly, put in the water bath at 98 degrees C to react for 1-2 hours to obtain graphene oxide dispersion liquid, added silver nitrate solution into the graphene dispersion, reduced with silver ion nanoparticles through residual hydrazine to obtain graphene/nano silver dispersion. The obtained dispersion is placed on the substrate film obtained by filtering film to obtain composite film, performed the thermal pressing and dried at 85 degrees C to obtain graphene/nanosilver based cellulose substrate conductive film.