▎ 摘　　要

NOVELTY - A photoelectrochemical sensor constructing method involves preparing azocene graphene quantum dots solution and preparing bismuth vanadate precursor. The bismuth vanadate precursor is dispersed in hydrochloric acid, stirred, added to azazepine quantum dot solution, transferred to a stainless steel autoclave for solvent thermal reaction to obtain ternary complex. The complex is dispersed in water, applied on indium tin oxide electrode, followed by taking saturated calomel electrode as reference electrode and platinum wire as the electrode as electrode system to obtain the finished product. USE - Method for constructing photoelectrochemical sensor for detecting dopamine. ADVANTAGE - The method enables constructing photoelectrochemical sensor with flexible operation, in simple and cost effective manner. DETAILED DESCRIPTION - A photoelectrochemical sensor constructing method involves preparing azocene graphene quantum dots solution by dissolving ammonium citrate in water, transferring to oil bath, carrying out heating reaction under constant pressure in the closed conditions to obtain azocene graphene quantum dots solution, preparing bismuth vanadate precursor by dissolving bismuth nitrate pentahydrate in concentrated nitric acid to obtain solution-A, dissolving ammonium metavanadate in sodium hydroxide solution to obtain solution-B, dropping solution-A dropwise to the solution-B, stirring to obtain mixed solution-C, adding sodium hydroxide solution to the mixed solution-C to obtain a mixed solution-D, transferring the mixed solution-D to a stainless steel autoclave to carry out a solvent thermal reaction to obtain bismuth vanadate precursor. The bismuth vanadate precursor is dispersed in hydrochloric acid, stirred uniformly, added to the azazepine quantum dot solution, transferred to a stainless steel autoclave for solvent thermal reaction to obtain ternary complex bismuth oxychloride/bismuth vanadate/nitrogen-doped graphene quantum dots. The ternary complex bismuth oxychloride/bismuth vanadate/nitrogen-doped graphene quantum dot is dispersed in ultrapure water, applied on indium tin oxide electrode used as the working electrode, followed by taking saturated calomel electrode as reference electrode and platinum wire as the electrode as three electrode system to obtain the finished product, and detecting dopamine without enzyme through photoelectrochemical analysis.