▎ 摘　　要

NOVELTY - Preparation of graphene-based high-entropy alloy nanoparticles involves preparing precursor solution of pre-synthesized high-entropy alloy nanoparticles, dispersing predetermined amount of graphene oxide powder in the precursor solution, obtaining a mixed solution, performing suction filtration of the mixed solution, obtaining graphene oxide self-supporting film loaded with metal salt, radiating by laser direct writing technology, and heating the metal salt-loaded graphene oxide self-supporting film. USE - Preparation of graphene-based high-entropy alloy nanoparticles used as sensitive material in preparation of electrochemical sensor (all claimed). ADVANTAGE - The method enables simple and quick preparation of graphene-based high-entropy alloy nanoparticles by rapid thermal decomposition of metal salt adsorbed on the graphene carrier, and effectively inhibiting precipitation of low-element alloy impurity phases, on a large scale. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation of electrochemical sensor, which involves preparing electrochemical sensing electrode, and coating the graphene-based high-entropy alloy nanoparticles on the electrochemical sensing electrode; and (2) electrochemical sensor.