Properties and preparation of an HClO₄-CrO₃-Graphite intercalation compound

A graphite intercalation compound (GIC) was prepared by the chemical oxidation method using natural graphite flakes, CrO₃ and HClO₄ as raw materials. The composition and structure of the GIC were characterized and analyzed by FTIR, XRD, TG and the effects of amount of the reactants, reaction temperature and time on the expansion volume of the GIC were investigated. Results showed that the intercalates were ClO₄^-、Cr₂O₇^2- and the biggest expansion volume of 555mL · g^-1 was achieved with a weight ratio of natural graphite flakes∶CrO₃∶HClO₄ being 1∶0. 3∶5, a reaction temperature of 30℃ and reaction time of 60min. The GIC had an excellent vacuum stability and 8mm wave attenuation ability.