▎ 摘　　要

NOVELTY - Preparing layer-by-layer self-assembled graphene quantum dots (GQDs)/3D-graphene/polyaniline (G/PANI) composite film comprises e.g. dispersing graphite alkene oxide in water, adding aqueous ammonia to adjust the pH of the solution to 12-13, adding hydrazine hydrate, transferring to hydrothermal reactor, reacting at 180-185 degrees C for 11-12 hours, filtering, washing, drying to obtain three-dimensional network graphene 3D-G, dispersing 3D-G in concentrated sulfuric acid, stirring in an ice water bath, adding potassium permanganate, reacting at 150-155 degrees C for 24-25 hours, cooling to room temperature, adding hydrogen peroxide to get a bright yellow GQDs solution, evaporating to obtain brown GQDs solid, dissolving GQDs solid in ultrapure water, filtering, dialyzing, freeze-drying to obtain graphene quantum dot GQDs powder, dispersing 3D-G and GQDs in hydrochloric acid solution, stirring evenly, adjusting pH to 5.0-6.0 with aqueous ammonia, and ultrasonically treating. USE - The method is useful for preparing layer-by-layer self-assembled graphene quantum dots (GQDs)/3D-graphene/polyaniline (G/PANI) composite film. ADVANTAGE - The method reduces agglomeration and shows good electrochemical catalytic activity for hydrogen peroxide. DETAILED DESCRIPTION - Preparing layer-by-layer self-assembled graphene quantum dots (GQDs)/3D-graphene/polyaniline (G/PANI) composite film comprises (1) dispersing graphite alkene oxide in water, adding aqueous ammonia to adjust the pH of the solution to 12-13, adding hydrazine hydrate, transferring to hydrothermal reactor, reacting at 180-185 degrees C for 11-12 hours, filtering, washing, and drying to obtain three-dimensional network graphene 3D-G, (2) dispersing 3D-G in concentrated sulfuric acid, stirring in an ice water bath, adding potassium Permanganate, reacting at 150-155 degrees C for 24-25 hours, cooling to room temperature, adding hydrogen peroxide to get a bright yellow GQDs solution, evaporating to obtain brown GQDs solid, dissolving GQDs solid in ultrapure water, filtering, dialyzing, and freeze-drying to obtain graphene quantum dot GQDs powder, (3) dispersing 3D-G and GQDs in hydrochloric acid solution, stirring evenly, adjusting pH to 5.0-6.0 with aqueous ammonia, ultrasonically treating for 20-30 minutes to obtain GQDs/3D-G composite dispersion, (4) adding ammonium persulfate to the hydrochloric acid solution containing aniline monomer, stirring at 0-5 degrees C for 24-25 hours, filtering, washing with diluted hydrochloric acid, ethanol and deionized water in turn, soaking aqueous ammonia for 10-12 hours, vacuum drying to obtain polyaniline, adding polyaniline to N,N-dimethylacetamide, stirring for 2-2.5 hours to obtain dark blue solution, adding to diluted hydrochloric acid and mixing well to obtain a stable aqueous dispersion conductive polyaniline solution, and (5) soaking hydroxy functionalized indium tin oxide (ITO) in the PANI solution for 2-2.5 hours, removing out, water rinsing, drying by blowing nitrogen gas at room temperature, immersing in the GQDs/3D-G composite dispersion for 2-2.5 hours, forming layer of GQDs/3D-G/PANI on the ITO, marking as (GQDs/3D-G/PANI)1, and repeating this cycle to self-assemble the (GQDs/3D-G/PANI)n composite film on the ITO upper layer.