Effect of Annealing Samples of Thermally Reduced Graphite Oxide on Their Electrophysical Characteristics

A comprehensive study aimed at finding fillers for modern composite radio-absorbing materials is carried out. The results of measurements of the electrophysical characteristics of powders of thermally reduced graphite oxide (TRGO), including presaturated acetic acid, are given. The effect of annealing the studied powders in the temperature range from 473 to 1173 K on low-frequency and microwave conductivity, density at pressures up to 5 MPa, and the magnitude of the EPR signal is considered. The results of measurements presented of the complex permittivity of all powders at a frequency of 9.8 GHz are presented. It is found that with an increase in the annealing temperature of the powders, their low-frequency and microwave conductivity increases, while the electron paramagnetic resonance (EPR) signal decreases.