▎ 摘　　要

NOVELTY - Preparing nano silver/graphene electrochemical sensor comprises e.g. (i) dispersing graphite oxide in deionized water, carrying out ultrasonic dispersion, adding silver nitrate and ethylenediaminetetraacetic acid solution into the solution, and heating in a water bath at 85-95 degrees C and adding slowly sodiumborohydride solution; (ii) heating continuously for 1.5-2.5 hours, during the reaction when the color of the solution gradually changes from brownish yellow to black it indicates that graphite oxide and silver ion have all been reduced, and nano silver/graphene composite nano materials have been generated and separating the dispersion; (iii) polishing the glassy carbon electrode with 0.5, 0.3 and 0.05 mu m alumina powder to the mirror surface in sequence, washing with acetone, ethanol and deionized water in sequence, drying at room temperature, adding the dispersion droplets prepared above to the surface of the glassy carbon electrode and drying at 20-30 degrees C. USE - The nano silver/graphene electrochemical sensor is useful for rapid detection of hydrogen peroxide in actual samples. ADVANTAGE - The method: is simple, fast, and easy to operate and prepares nano-silver/graphene electrochemical sensor with strong catalytic activity for the electrical reduction of hydrogen peroxide . DETAILED DESCRIPTION - Preparing nano silver/graphene electrochemical sensor comprises (i) dispersing 15-25 pts. wt. graphite oxide in 90-100 pts. wt. deionized water, carrying out ultrasonic dispersion for 2-3 hours, adding 10-20 pts. wt. (0.05 mol/liter) silver nitrate and 4-6 pts. wt. (0.2 mol/liter) ethylenediaminetetraacetic acid solution into the solution under constant stirring, and heating in a water bath at 85-95 degrees C and adding slowly 50-60 pts. wt. sodiumborohydride solution with a concentration of 0.05 mol/liter; (ii) heating continuously for 1.5-2.5 hours, during the reaction when the color of the solution gradually changes from brownish yellow to black it indicates that graphite oxide and silver ion have all been reduced, and nano silver/graphene composite nano materials have been generated and separating the dispersion; (iii) polishing the glassy carbon electrode with 0.5, 0.3 and 0.05 mu m alumina powder to the mirror surface in sequence, washing with acetone, ethanol and deionized water in sequence, drying at room temperature, adding the dispersion droplets prepared above to the surface of the glassy carbon electrode and drying at 20-30 degrees C.