▎ 摘　　要

NOVELTY - The preparation of cladding-free multilayer graphene self-supporting tube involves (i) taking a metal wire, soaking in dilute nitric acid, removing surface impurities and passivation layer, placing in absolute ethanol, and drying, (ii) using a dried wire as a growth substrate, adding into a chemical vapor deposition equipment, and surface depositing graphene to obtain a graphene/wire composite structure, (iii) depositing a metal wire composite coated metal catalyst template on the surface of a graphene/wire composite structure, and adding into a chemical vapor deposition equipment. USE - Preparation of cladding-free multilayer graphene self-supporting tube used in microelectronic device, transparent electrode, organic optoelectronic device, energy storage battery, and biomedical application. ADVANTAGE - The method enables the preparation of cladding-free multilayer graphene self-supporting tube with excellent mobility, mechanical strength, thermal conductivity, and corrosion resistance. DETAILED DESCRIPTION - The preparation method of cladding-free multilayer graphene self-supporting tube involves (i) taking a metal wire, soaking in dilute nitric acid, removing surface impurities and passivation layer, placing in absolute ethanol, and drying, (ii) using a dried wire as a growth substrate, adding into a chemical vapor deposition equipment, and surface depositing graphene to obtain a graphene/wire composite structure, (iii) depositing a metal wire composite coated metal catalyst template on the surface of a graphene/wire composite structure, adding into a chemical vapor deposition equipment, repeatedly depositing graphene on metal catalyst template for several times to obtain a composite material with graphene/metal catalyst repeating structure, and (iv) placing the composite material with graphene/metal catalyst repeating structure in the etching solution, removing metal wire and metal catalyst template, washing the reaction product with absolute ethanol and deionized water, and drying.