▎ 摘　　要

NOVELTY - Preparing polyvinyl acetate (PVA)-nano copper composite material involves weighing citric acid according to the proportion, histidine and mixing uniformly, adding deionized water, dissolving to obtain reaction liquid, putting the reaction liquid in the oven, the oven temperature is 150-250℃ for 3- 6 hours to obtain the histidine functionalized graphene quantum dot; weighing PVA adding deionized water stirring and boiling to completely dissolve, preparing PVA solution, adding the histidine functionalized graphene quantum dot prepared into the PVA solution, adjusting the pH value to neutral by sodium hydroxide (NaOH), stirring and gradually adding copper chloride solution, stirring for 80-120min, adding 3 % of borax to make the solution gel, freezing and drying, PVA histidine functionalized graphene quantum dot, calcining the freeze-dried gel in the inert gas atmosphere to obtain the PVA-nano copper composite material. USE - Method for preparing polyvinyl acetate (PVA)-nano copper composite material. ADVANTAGE - The method enables to prepare PVA-nano copper composite material that has high sensitivity. DETAILED DESCRIPTION - Preparing polyvinyl acetate (PVA)-nano copper composite material involves weighing citric acid according to the proportion, histidine and mixing uniformly, adding deionized water, dissolving to obtain reaction liquid, putting the reaction liquid in the oven, the oven temperature is 150-250℃ for 3- 6 hours to obtain the histidine functionalized graphene quantum dot; weighing PVA adding deionized water stirring and boiling to completely dissolve, preparing PVA solution, adding the histidine functionalized graphene quantum dot prepared into the PVA solution, adjusting the pH value to neutral by sodium hydroxide (NaOH), stirring and gradually adding copper chloride solution, stirring for 80-120min, adding 3 % of borax to make the solution gel, freezing and drying, PVA histidine functionalized graphene quantum dot, the mass ratio of copper chloride borax is 1:0.05:0.02-0.04:0.075-0.15; calcining the freeze-dried gel in the inert gas atmosphere to obtain the PVA-nano copper composite material. An INDEPENDENT CLAIM is included for use of PVA-nanometer copper composite material in preparing polyvinyl acetate/copper nanoparticles/glassy carbon electrode (PVA/CuNPs/ GCE) composite electrode.