▎ 摘　　要

NOVELTY - A noble metal nanocomposites preparing method involves preparing an aqueous solution of graphene oxide, adding an aqueous solution of a salt of a noble metal to the solution of the graphene oxide to form a complex of the graphene oxide and the noble metal ion in aqueous solution, adding an extract of Artocarpus integrifolia leaves to the aqueous solution of the noble metal ion-graphene oxide complex to reduce the noble metal ion, and forming a composite of nanoparticles of the reduced noble metal embedded on the graphene oxide and having a particle size of 1-30 nm. USE - Method for preparing noble metal nanocomposites that is utilized in biosensor, fuel cell, and biomedical applications.. ADVANTAGE - The method enables preparing noble metal nanocomposites without toxic chemicals. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (1) a platinum-graphene oxide nanocomposite prepared by the method (2) a gold-graphene oxide nanocomposite prepared by the method (3) a silver-graphene oxide nanocomposite prepared by the method.