▎ 摘　　要

NOVELTY - Method for preparing nanocellulose-graphene oxide film composite material, involves (a) preparing graphene oxide and nanocellulose, (b) adding graphene oxide and nanocellulose to solution, and uniformly stirring to obtain uniform nanocellulose/graphene oxide suspension, (c) dripping 3-(methacryloyloxy) propyltrimethoxysilane in suspension and uniformly stirring at room temperature, centrifuging, washing, and removing residual 3-(methacryloxy) propyltrimethoxysilane to obtain nanocellulose/graphite oxide hybrid system, and (d) adding hydrogen peroxide solution to oxidation reaction in nanocellulose/graphite oxide mixing system, washing and removing impurities to obtain functionalized nanocellulose/graphene oxide mixed solution of grafted sulfonic acid group, and filtering mixed solution to film to obtain nanocellulose/graphene oxide thin film composite material. USE - The method is used for preparing nanocellulose-graphene oxide film composite material useful in electrochemical gas sensor (all claimed). ADVANTAGE - The composite material exhibits excellent optimal detection performance, sensitivity and stability. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a nanocellulose-graphene oxide film composite material prepared using above-mentioned method, comprising nanocellulose and graphene oxide, wrapping nanofibers and covering using graphene oxide sheet layer interspersing in nanocellulose network to form three-dimensional semi-interpenetrating network structure.