▎ 摘　　要

NOVELTY - Constructing graphene quantum dots/zeolitic imidazolate framework-8 as a signal quencher sensor, comprises (1) synthesizing bismuth niobium oxychloride, (2) synthesizing bismuth niobium oxychloride/ Stannum indium sulfide heterojunction; (3) constructing indium tin oxide/ bismuth niobium oxychloride / Stannum indium sulfide electrode, (4) synthesizing graphene quantum dots, (5) synthesizing graphene quantum dots/zeolitic imidazolate framework-8, (6) synthesizing second antibody-graphene quantum dots/ zeolitic imidazolate framework-8, (7) synthesizing Ab2-second antibody-graphene quantum dots/zeolitic imidazolate framework-8, (8) constructing photoelectric sensor (PEC), and (9) electrochemical detection of photoelectric sensors. USE - The method is useful for constructing graphene quantum dots/zeolitic imidazolate framework-8 as a signal quencher sensor. ADVANTAGE - The method: can effectively improve the charge separation efficiency due to the appropriate energy band position ; adopts graphene quantum dots/zeolitic imidazolate framework-8 polyhedra modified on the secondary antibody, can act as a signal quencher, which can suppress the photocurrent signal of the indium tin oxide/ bismuth niobium oxychloride / Stannum indium sulfide electrode through the steric hindrance effect, and act as a peroxidase mimic to catalyze 4-chloro-1-naphthol precipitation reaction; and reduces the photocurrent signal to achieve the effect of improving the sensitivity of the sensor.