▎ 摘　　要

NOVELTY - A functionalized graphene sheet comprises at least one functional group on basal plane of graphene sheet. USE - Functionalized graphene sheet used for manufacturing metal nanoparticle-graphene composite and polymer-graphene composite (both claimed). Uses include but are not limited to emissive displays, micromechanical resonators, transistors, ultrasensitive chemical detectors, super capacitors, catalyst supports, batteries and fuel cells. ADVANTAGE - The functionalized graphene sheet has favorable solubility in aqueous, non-aqueous and semi-aqueous solutions and organic solvent. The polymer-graphene composite has improved thermal, mechanical and electric properties. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) process for producing functionalized graphene sheet, which involves sonicating graphite oxide to produce exfoliated graphene oxide, pre-reducing the exfoliated graphene oxide using a reducing agent solution devoid of ammonia to produce reduced graphene oxide, and sulfonating the reduced graphene oxide to produce partially sulfonated graphene sheets, without using polymeric or surfactant stabilizers during or after the process to produce dispersible graphene sheets; (2) manufacture of metal nanoparticle-graphene composite, which involves mixing metal-containing precursor with a solvated dispersion of graphene sheets in the presence of at least one reducing agent to reduce the precursor to a metal nanoparticle, precipitating the metal nanoparticle-graphene sheets and drying the metal nanoparticle-graphene sheets; and (3) manufacture of polymer-graphene composite, which involves blending graphene sheets dispersed in an organic solvent with a solution of a polymer to form a graphene-polymer mixture, and solidifying the mixture.