▎ 摘　　要

NOVELTY - Preparing graphene/nano-silver composite material comprises (i) dissolving hydroxypropyl methylcellulose in deionized water, ultrasonic processing for 1-12 hours, adding sodium periodate, reacting under dark, washing, centrifuging and drying, and (ii) mixing aqueous modified hydroxypropyl methylcellulose solution and silver-ammonia solution with graphene oxide mixed solution, ultrasonic processing, reacting in a polytetrafluoroethylene lined hydrothermal reaction kettle, naturally cooling, repeatedly washing using ethyl alcohol and deionized water, centrifuging and drying. USE - The method is useful for preparing graphene/nano-silver composite material (claimed). ADVANTAGE - The method is simple, utilizes raw materials which are widely distributed, ensures mild reaction, and is environmentally friendly. DETAILED DESCRIPTION - Preparing graphene/nano-silver composite material comprises (i) dissolving hydroxypropyl methylcellulose in deionized water of bath ratio 1:50, ultrasonic processing for 1-12 hours, adding 2-10 g/l sodium periodate, reacting under dark at 40-80 degrees C for 10-60 minutes, washing repeatedly using deionized water, centrifuging and drying, and (ii) mixing 100 g/l aqueous modified hydroxypropyl methylcellulose solution and specific concentration of silver-ammonia solution with specific concentration of graphene oxide mixed solution according to volume ratio of 10:1:1-1:1:1, ultrasonic processing for 1-12 hours at 40-100 degrees C, reacting in a polytetrafluoroethylene lined hydrothermal reaction kettle for 1-48 hours at 160-220 degrees C, naturally cooling, repeatedly washing using ethyl alcohol and deionized water, centrifuging and drying.