▎ 摘　　要

NOVELTY - Preparation method of highly conductive and thermally conductive sheet gallium indium doped aluminum-doped zinc oxide (AZO), involves a. drying the composite slurry by spraying to obtain aluminum gallium indium sol and zinc acetate composite coated graphene oxide powder; h. firing the composite coated graphene oxide powder prepared in step a) in a continuous tunnel sintering furnace to obtain gallium indium doped AZO powder, the temperature in the middle section is 400-500 °C, and the temperature at the high-temperature end at the outlet is 500-600 °C; b. grinding the sintered flake gallium indium doped AZO powder and pulverizing by a heatable vertical stirring mill, spraying silane coupling agent reaction solution into the stirring mill and then the ball milling is continued to stir until the silane coupling agent reaction solution is evenly coated on the surface of the powder, stirring and heating are continued, and the drying temperature is 80-120 °C. USE - Preparation of high-conductivity and heat-conducting sheet-like gallium indium doped with aluminum-doped zinc oxide. ADVANTAGE - The method has simple process, strong operability and easy large-scale continuous production. DETAILED DESCRIPTION - Preparation method of highly conductive and thermally conductive sheet gallium indium doped aluminum-doped zinc oxide (AZO), involves a. taking graphene oxide as a synthetic template, dispersing it in deionized water, and dispersing with high energy and high shear to obtain a uniformly dispersed graphene oxide slurry; b. dissolving soluble zinc acetate dihydrate, aluminum nitrate nonahydrate, gallium nitrate, indium nitrate, oxalic acid and polyvinyl alcohol plastic in deionized water to obtain their salts, acid solutions and polymer solutions, mixing silane coupling agent, deionized water, acetic acid, stirring and mixing with ethanol to form a silane coupling agent reaction solution; c. adding aluminum nitrate, gallium nitrate and indium nitrate aqueous solution into the heatable reaction kettle, adding oxalic acid solution, heating up to 50-70 °C, and reacting for 12-24 hours to form a viscous solution; d. continue to stir the liquid in the reaction kettle, then adding ethylene glycol and polyvinyl alcohol solution in the reaction kettle, and reacting again for 5-10 hours at the same temperature; e. stirring the liquid in the reaction kettle continuously, heating to 90-110 °C, and dehydrating to obtain a highly viscous aluminum gallium indium sol; f. pumping graphene oxide slurry into the acid and alkali-resistant reactor, or deionized water and graphene oxide powder are directly added in the reactor, after stirring evenly, the high-speed emulsifier at the bottom is used to disperse the graphene oxide to obtain a uniform graphene oxide slurry, then adding the zinc acetate solution, stirring evenly, adding the aluminum gallium indium sol, stirring evenly, to obtain a composite slurry, the viscosity of the composite slurry is 0.1-2 pascal-second; g. drying the composite slurry by spraying to obtain aluminum gallium indium sol and zinc acetate composite coated graphene oxide powder; h. firing the composite coated graphene oxide powder prepared in step g) in a continuous tunnel sintering furnace to obtain gallium indium doped AZO powder, temperature at the inlet end of the tunnel furnace is 200-300 °C, the temperature in the middle section is 400-500 °C, and the temperature at the high-temperature end at the outlet is 500-600 °C; h. grinding the sintered flake gallium indium doped AZO powder and pulverizing by a heatable vertical stirring mill, spraying silane coupling agent reaction solution into the stirring mill and then the ball milling is continued to stir until the silane coupling agent reaction solution is evenly coated on the surface of the powder, stirring and heating are continued, and the drying temperature is 80-120 °C. INDEPENDENT CLAIMS are included for: a highly conductive and thermally conductive sheet gallium indium doped AZO having aspect ratio of the sheet-like morphology of the highly conductive and thermally conductive sheet gallium indium doped AZO is greater than 20, and the average particle size is greater than 2 microns; and a polymer composite material comprises flake gallium indium doped AZO powder and the thermal conductivity and electrical conductivity of the polymer composite material is more than 2 times higher than that of the irregular-shaped gallium indium-doped AZO powder composite material with the same volume content. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of continuous production line for preparation of high-conductivity and heat-conducting sheet-like gallium indium doped with aluminum-doped zinc oxide (Drawing includes non-English language text). 1-1Gallium nitrate and indium nitrate mixed solution storage tank 1-2Polyvinyl alcohol solution storage tank 1-3Glycol storage tank 1-4Oxalic acid solution storage tank 2Double-heating reaction kettle machine