▎ 摘　　要

NOVELTY - A graphene loaded silver sensor preparing method involves mixing graphene oxide and silver nitrate ultrasonically to obtain mixed solution. The mixed solution is reacted with sodium hydroxide solution, cooled, and centrifuged, followed by carrying out observation of mixed liquid, and drying the mixed liquid to obtain graphite oxide/silver nano composite material powder. The material powder is mixed with graphite ultrasonically, ground and mixed with liquid paraffin to obtain mixture, which is press-molded and connected with copper wire in a sensor, which is polished, washed and dried. USE - Method for preparing graphene loaded silver for detecting lead ion content in water. ADVANTAGE - The method enables preparing the graphene loaded silver sensor with increased electron migration rate and reduced internal resistance. DETAILED DESCRIPTION - A graphene loaded silver sensor preparing method involves mixing 20-30 ml graphene oxide with concentration of 2-6 mmol/l and 5-7 ml silver nitrate with concentration of 10 mmol/l ultrasonically for 30 minutes to obtain mixed solution. The mixed solution is transferred in a water bath at 70 degrees C by adding 7-10 ml sodium hydroxide solution with concentration of 4 mol/l, and reacted for 5-15 minutes to obtain mixture. The mixture is cooled, and centrifuged at 8000 rpm for 5 minutes, carrying out observation of mixed liquid, and drying the mixed liquid at 80 degrees C to obtain graphite oxide/silver nano composite material powder. The composite material powder is mixed with graphite ultrasonically and ground to obtain solid nanometer granule. The solid nanometer granule is mixed with liquid paraffin to obtain mixture. The mixture is press-molded and connected with copper wire in a sensor. The resultant sensor is polished with polishing powder, and washed with water, cleaned with nitric acid, ethyl alcohol, and water ultrasonically, and dried for 10-15 days to obtain a finished product.