▎ 摘　　要

NOVELTY - Making carbon nanostructures involves providing explosive material having carbon-based molecules; dissolving explosive material in supercritical fluid in an oxygen-free environment; heating supercritical fluid to a temperature exceeding the decomposition temperature of explosive to decompose the explosive molecules into reactants comprising activated carbon (C) or carbon monoxide (CO); reassembling the activated C with or without a catalyst or CO with a catalyst in the supercritical fluid to form carbon nanostructures; and filtering the fluid to remove the carbon nanostructures. USE - For making carbon nanostructures including at least one (preferably at least two) of graphene, fullerenes and nanotubes (claimed). ADVANTAGE - The method can be performed without a metal reactant at relatively low temperatures in the supercritical region to provide a cost-effective path to bulk fabrication of nanostructures; and provides metal-free carbon nanostructures. The use of supercritical fluid in the method provides an environment that safely dissolves and decomposes the explosive molecules into its reactant products including activated C or CO and provides the temperature and pressure for the required collision rate of activated C atoms and CO molecules to form carbon nanostructures. DETAILED DESCRIPTION - Making carbon nanostructures, involves providing an explosive material comprising carbon-based molecules, where the explosive have a negative oxygen balance; dissolving the explosive material in a supercritical fluid in an oxygen-free environment, where the supercritical fluid acts as an inert buffer to separate the carbon-based explosive molecules; heating the supercritical fluid to a temperature exceeding the decomposition temperature of the explosive to decompose the explosive molecules into reactants comprising activated carbon (C) or carbon monoxide (CO); reassembling the activated C with or without a catalyst or CO with a catalyst in the supercritical fluid to form carbon nanostructures; and filtering the fluid to remove the carbon nanostructures.