▎ 摘　　要

NOVELTY - Preparing gold-mercury-reduced graphene oxide (Au-Hg-rGO) nanocomposite comprises (i) preparing 1 wt.% chloroauric acid solution, and preparing citric acid-sodium citrate buffer solution, (ii) mixing 1-3 ml chloroauric acid solution and 57-59 ml citric acid-sodium citrate buffer to mix well, quickly adding 1-3 ml of 10 mg/ml sodium borohydride, and heating and stirring to obtain gold nanoparticles, (iii) adding 100-500 mu l of 1 mM mercury sulfate solution to the gold nanoparticle solution, and stirring for 30 minutes to obtain gold-mercury nanoparticles, (iv) placing the graphene oxide in deionized water, and sonicating for 1 hour to obtain a suspension of 1 mg/ml graphene, and (v) taking the gold-mercury nanoparticles into the suspension of graphene and mixing by ultrasonic stirring, stirring with magnetic stirrer, and after 1-3 hours of ultraviolet irradiation, obtaining Au-Hg/rGO nanocomposite material. USE - The nanocomposite is useful for detecting hydrogen peroxide (claimed). ADVANTAGE - The nanocomposite has good catalytic performance for hydrogen peroxide, the linear range is 5-100 mu M, and the detection limit is 3.25 mu M (S/N=3), and good application prospects.