▎ 摘　　要

NOVELTY - A sensor preparing method involves setting the potential range from 0 to 1.2 V, oxidizing in 0.14-0.18 mol/L potassium chloride solution. Pyrrole solution is circulated for 10-14 times, and polypyrrole is modified onto the pretreated palladium electrode. The nano-graphene oxide solution is dropped onto the electrode surface and evaporated to form nano-graphene oxide- polypyrrole-platinum electrode followed by utilizing copper chloride as copper raw material, depositing copper nanoparticles on the electrode by using electrochemical deposition methods to obtain sensor. USE - Method for preparing sensor for detecting nitrogen oxides. ADVANTAGE - The sensor detects nitrogen oxides with high sensitivity and better repeatability and has better stability. DETAILED DESCRIPTION - A sensor preparing method involves setting the potential range from 0 to 1.2 V, oxidizing in 0.14-0.18 mol/L potassium chloride solution in an inert atmosphere. 0.4-0.8 mol/L pyrrole solution is circulated for 10-14 times, and polypyrrole is modified onto the pretreated palladium electrode. The nano-graphene oxide solution is dropped onto the polypyrrole-modified palladium electrode surface and evaporated to form nano-graphene oxide- polypyrrole-platinum electrode followed by utilizing 0.14-0.18 mol/l potassium chloride as the supporting electrode, setting the potential range of -0.4 to +1.2 V, and utilizing 0.1-0.3 mol/l copper chloride as the copper raw material, depositing copper nanoparticles on the electrode by using electrochemical deposition methods to obtain sensor.