▎ 摘　　要

NOVELTY - Composite synthesis method of graphene and nano silver involves stirring concentrated sulfuric acid, graphite powder, sodium nitrate and potassium permanganate, adding hydrogen peroxide, reacting to obtain base material (A), preparing base material (B), filtering base material (A), washing with 5% hydrochloric acid and deionized water until the detection of no silver sulfate in the reaction bottle, vacuum-drying filtrate to obtain crude graphene (A), adding base material (B) to reaction bottle of crude graphene (A), performing high-efficiency composite synthesis method to obtain crude graphene (B), adding base material (B) to crude graphene (B), adding hydrazine hydrate, reacting, filtering, washing with methanol and water multiple times, vacuum-drying to obtain graphene solution, adding graphene solution, polyvinylpyrrolidone and silver nitrate solution to beaker, mixing with sodium borohydride solution to obtain mixed solution, stirring mixed solution to obtain sol and dialyzing. USE - Composite synthesis method of graphene and nano silver. ADVANTAGE - The method is quick and environmentally-friendly, and adopts Hummers method to synthesize graphene and mixed with tin-copper alloy in proportion through chemical synthesis to produce composite of graphene and nano silver with high efficiency. DETAILED DESCRIPTION - Composite synthesis method of graphene and nano silver involves adding 95-98% concentrated sulfuric acid to 250 ml reaction bottle assembled in ice water bath, stirring, adding 2-5 g graphite powder, 1-2 g sodium nitrate and 6-8 g potassium permanganate, stirring for 20 minutes, adding 30% hydrogen peroxide, reacting for 24 hours to obtain base material (A), adding concentrated sulfuric acid to 250 ml reaction bottle assembled in ice water bath, stirring, adding 2-5 g graphite powder, 1-2 g sodium nitrate and 6-8 g potassium permanganate, stirring for 20 minutes, adding 30% hydrogen peroxide and 2-4 ml of 80% hydrazine hydrate, reacting for 24 hours, filtering to obtain base material (B), filtering base material (A) while hot, washing with 5% hydrochloric acid and deionized water until the detection of no silver sulfate in the reaction bottle, vacuum-drying the filtrate at 60 degrees C for 24 hours to obtain crude graphene (A), adding base material (B) to reaction bottle of crude graphene (A), performing high-efficiency composite synthesis method under ultrasonic condition to obtain stable dispersion, pouring to four-necked flask, reacting at 80 degrees C to obtain crude graphene (B), adding base material (B) to surface of crude graphene (B), adding 2-4 ml of 80% hydrazine hydrate, reacting for 24 hours, filtering, washing with methanol and water multiple times, vacuum-drying at 60 degrees C to obtain graphene solution, adding graphene solution, polyvinylpyrrolidone and 0.0080 mol/L silver nitrate solution to the beaker with water, slowly adding 0.0060 mol/L sodium borohydride solution, mixing to obtain mixed solution, magnetically stirring mixed solution for 2 hours to obtain sol and dialyzing sol in dialysis bag for 24 hours where reaction flask is a conical flask lined with asbestos mesh. The composite graphene and nano silver comprise 0.05-0.15 wt.% graphene, 3-6 wt.% nano silver and balance tin-copper alloy.