▎ 摘　　要

NOVELTY - Production of graphene nanoplatelets involves depositing seed layer on nonsupported graphene nanoplatelets (GNPs) in aqueous suspension, for growth of zinc oxide nanorods/microrods on nonsupported GNPs. During initial deposition of seed layer, uniformity and size of nanoparticles which constitute seed layer are controlled through stirring or ultrasonically processing. The growth of microrods/nanorods is made by technique chosen from static hydrothermal growth, dynamic hydrothermal growth, and ultrasonically processing, in order to control diameter and length of structure produced. USE - Production of graphene nanoplatelets decorated with zinc-oxide nanorods or microrods used as filler in polymer matrices to obtain nanocomposites e.g. radar-absorbent material, and for catalytic or energy-harvesting application. ADVANTAGE - The method produces graphene nanoplatelets having excellent electrical property, electronic property, and mechanical property. The method enables effective control of morphology of zinc oxide nanostructures and of the coating density of graphene flakes. The graphene nanoplatelets are capable of producing nanocomposites having excellent electromagnetic property and electromechanical property. The method is simple and economical, and does not require the use of a catalyst, and produces end product free from impurities. DETAILED DESCRIPTION - Production of graphene nanoplatelets decorated with zinc-oxide nanorods or microrods (possibly doped with metals) involves producing aqueous suspension of graphene nanoplatelets (GNPs), depositing seed layer on nonsupported GNPs in the aqueous suspension and growing zinc oxide nanorods/microrods on the nonsupported GNPs in the aqueous suspension. During initial deposition of the seed layer, on GNPs in suspension, the uniformity and size of the nanoparticles which constitute the seed layer are controlled through use of a technique of stirring (magnetic or mechanical) or ultrasonically processing, and the temperature of the subsequent process of heating in an oven. The growth of zinc oxide microrods/nanorods with the desired morphology, recourse is made by a technique of growth chosen from static hydrothermal growth, dynamic hydrothermal growth, and growth by ultrasonically processing, in order to be able to control the morphological characteristics of the structures produced, such as diameter and length.