Chemical synthesis of graphite nanoparticles and study of microwave radiation absorption by graphite nanocomposites

Nanostructured radar absorbing materials (RAMs) have received steadily growing interest because of their fascinating properties and various applications compared with the bulk or microsized counterparts. These nanostructured materials have increased surface area, number of dangling bond atoms and unsaturated co-ordination on surface lead to interface polarization, multiple scatter and absorbing more microwave. In this paper, new method was developed to produce graphite nanoparticles. Graphite powder is immersed in a mixed with solution of nitric and calcium citrate. After heating the solution up to 50°C and leaving them in the air for 12 hours in presence of low magnetic field, we obtained graphite nanoparticles. This process could provide an easy and inexpensive method for the preparation of graphite nanoparticles. They possess remarkable electrical, mechanical, optical, thermal and chemical properties and low cost material which make them a perfect fit for many engineering applications. Chemically synthesized graphite nanoparticles were mixed with barium sulphate to get graphite nanocomposite. These nanocomposite were used as microwave absorbent material to study the microwave properties like reflection coefficient and return loss. The results showed that these nanostructured composite can be used to design multilayer radar absorbing materials.