▎ 摘　　要

NOVELTY - Preparing molecular imprinted electrode involves dispersing graphene oxide in water in weight volume ratio of 1 mg:1-3 milliliter. The pH of the dispersion liquid is adjusted to 9-11 and then urea is mixed to form a mixed solution under stirring condition. The mass of urea added is 80-150 times the mass of the graphene oxide. After stirring the mixture at 20-30 degrees C for 20-50 minutes, the mixture is heated to 100-130 degrees C for 8-16 hours. The reaction solution is cooled and centrifuged to obtain precipitate which is washed and dried to obtain nitrogen-doped reduced graphene oxide. USE - Method for preparing molecular imprinted electrode for detecting salbutamol quantitatively (claimed). ADVANTAGE - The method enables to prepare molecular imprinted electrode and chemical sensor which have low detection limit, good stability, strong anti-interference performance and good reproducibility. DETAILED DESCRIPTION - Preparing molecular imprinted electrode involves dispersing graphene oxide in water in weight volume ratio of 1 mg:1-3 milliliter. The pH of the dispersion liquid is adjusted to 9-11 and then urea is mixed to form a mixed solution under stirring condition. The mass of urea added is 80-150 times the mass of the graphene oxide. After stirring the mixture at 20-30 degrees C for 20-50 minutes, the mixture is heated to 100-130 degrees C for 8-16 hours. The reaction solution is cooled and centrifuged to obtain precipitate which is washed and dried to obtain nitrogen-doped reduced graphene oxide. The nitrogen-doped dopant oxide-reduced graphene is ultrasonically dispersed in water and then the glucose-forming solution is added to the nitrogen-doped reduced graphene oxide. Graphene oxide, water and glucose are mixed in weight volume ratio of 1-3 mg:1-3 milliliter:30 mg. 0.3-0.4 molar liquor ammonia is added to 0.03-0.05 molar silver nitrate solution to obtain precipitate and liquor ammonia solution is added continuously until the precipitation disappears to obtain the silver ammonia solution which is mixed with glucose-forming solution with stirring for 0.5-2 hours. The solution is cured for 3-6 hours, then centrifuged and the obtained precipitate is washed and dried to obtain silver/nitrogen co-doped reduced graphene nanocomposite which is dispersed in organic solvent and then coated on the surface of the working electrode to obtain a silver/nitrogen co-doped reduced graphene modified electrode. The ratio of nitrogen co-doped reduced grained graphene nanocomposite to organic solvent is 1 mg:1-2 milliliter. The silver/nitrogen co-doped reduced graphene modified electrode is subjected to cyclic voltammetry in phosphate-buffered saline buffer solution containing 1.0-2.0 molar ortho phenylenediamine and 0.3-1.0 molar salbutamol. The obtained electrode is placed in 0.2-0.5 molar sulfuric acid solution and then subjected to cyclic voltammetry to remove salbutamol in the polymer film to obtain silver/nitrogen co-doped reduced graphene-based molecular imprinted electrode. An INDEPENDENT CLAIM is included for electrochemical sensor which comprises silver/nitrogen co-doped reduced graphene-based molecular imprinted electrode as the working electrode, saturated calomel electrode as the reference electrode and platinum electrode as the auxiliary electrode.