Effect of Naphthalene Addition on the Microwave Absorption Properties of Graphene Foam

Abstract

Graphene foams (GFs) with different naphthalene addition were prepared by solvothermal method. With the addition of naphthalene, graphene hydrogels can be directly vacuum dried without freezing. Three groups of GFs with different microstructures can be obtained by changing the amount of naphthalene added. Through comparison, it is found that reasonable control of naphthalene addition can adjust the internal structure of GF, and then effectively regulate the dielectric properties of GF. When the addition of naphthalene was 80 g, GF-80 showed excellent performance of microwave absorption (MA). When the mass content of GF-80 was only 2% and the matching thickness was 3.38mm, the minimum reflection loss (RLmin) could reach -55.89 dB. And 6.88 GHz bandwidth of RL less than -10 dB was achieved by GF-80 with the thickness of 2.31 mm.

Keywords: Graphene foam, Naphthalene, Wave absorption properties, Solvothermal method