Combustion synthesis of SiC/graphene nanocomposites with strong microwave absorption

Economical and green preparation of SiC composites with tunable microwave-absorbing properties is crucial for industrial applications. In this study, SiC/graphene nanocomposites were synthesized via combustion synthesis technology by using CO 2 , a greenhouse gas, as the carbon source. The phase composition, microstructure and microwave-absorbing performance of the SiC/graphene nanocomposites were characterized. Dielectric properties and impedance matching can be precisely controlled simultaneously by changing the composition of the SiC/graphene nanocomposites. The characteristic microstructure of the SiC/graphene nanocomposites with networks of multilayer graphene sheets has a significant contribution to the improved microwave attenuation capability. The SiC/graphene nanocomposite sample with optimized composition and microstructure showed excellent microwave-absorbing performance, with a reflection loss (RL) of −63.94 dB at 6.15 GHz, and effective absorption bandwidth (EAB) of 4.05 GHz for RL < −10 dB. The SiC/graphene nanocomposites with strong microwave absorption have great potential for applications prospects in various fields.