▎ 摘　　要

NOVELTY - Preparing a graphene shell comprises: (i) performing a first heat treatment on a mixture of an organic solvent and a graphitization catalyst so as to carburize the graphitization catalyst with carbon decomposed from the organic solvent, where the graphitization catalyst is in the form of particles; and (ii) forming graphene shells on surfaces of the carburized graphitization catalyst by performing a second heat treatment process on the carburized graphitization catalyst in an inert or reductive gas atmosphere. USE - The method is useful for preparing graphene shells. The graphene shells, having cylindrical shape with both ends open, are useful as optical fibers for transmitting optical signals or a conductor. The graphene shells are useful to store hydrogen. ADVANTAGE - The graphene sheets have good crystalline characteristics and a three-dimensional structure. The method easily controls the shape and thickness of the graphene shell. The graphene shell stores hydrogen without causing any safety hazard or requiring any additional device and since the graphene shells are uniform and have relatively large surface areas, a large amount of hydrogen can be stored. The graphene shells are not readily deformed, even after storage of hydrogen and its discharge, due to the dense structure of the shells. The graphene shells are flexible, have high electron mobility, and have characteristics of glass-based optical fibers such as a low transmission loss and high transmission rate and in addition have the characteristics of plastic based optical fibers such as flexibility and easy handling. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the graphene shell obtained by the method.