▎ 摘　　要

NOVELTY - Preparation of nitrogen-doped graphene-based composite tungsten disulfide nanosheet electrochemical sensor involves (S1) dissolving tungsten hexachloride, thioacetamide and graphene oxide powder in deionized water, ultrasonically dispersing, hydrothermally reacting, precipitating, reflux treating in mixed solution of absolute ethyl alcohol and 3-aminopropyltrimethoxysilane, mixing with graphene oxide aqueous solution, drying to obtain reduced graphene oxide composite tungsten disulfide nanosheet powder (A), (S2) grinding and mixing powder (A) and melamine, performing high-temperature heating under nitrogen atmosphere to obtain nitrogen-doped reduced graphene oxide composite tungsten disulfide nanosheet powder (B), and (S3) dispersing powder (B) into mixed solution of absolute ethyl alcohol and perfluorosulfonic acid type polymer solution, transferring using liquid transfer gun to drop in screen-printed carbon electrode, and naturally drying at room temperature. USE - Preparation of nitrogen-doped graphene-based composite tungsten disulfide nanosheet electrochemical sensor used for dopamine detection (claimed). ADVANTAGE - The method is simple, economical and environmentally-friendly, and has wide raw material source. The constructed electrochemical sensor is simple to operate and does not need any treatment, and has short testing time, and improved analysis speed. DETAILED DESCRIPTION - Preparation of nitrogen-doped graphene-based composite tungsten disulfide nanosheet electrochemical sensor involves (S1) dissolving tungsten hexachloride, thioacetamide and graphene oxide powder in deionized water, stirring and ultrasonically dispersing, hydrothermally reacting, washing, precipitating after cooling to room temperature, reflux treating in mixed solution of absolute ethyl alcohol and 3-aminopropyltrimethoxysilane, mixing with graphene oxide aqueous solution at room temperature, drying in vacuum oven to obtain reduced graphene oxide composite tungsten disulfide nanosheet powder (A), (S2) grinding and mixing powder (A) and melamine, transferring into quartz boat, performing high-temperature heating under nitrogen atmosphere to obtain nitrogen-doped reduced graphene oxide composite tungsten disulfide nanosheet powder (B), (S3) dispersing powder (B) into mixed solution of absolute ethyl alcohol and perfluorosulfonic acid type polymer solution, ultrasonically dispersing, transferring using liquid transfer gun to drop in screen-printed carbon electrode, and naturally drying at room temperature.