Fabrication and microwave absorption properties of the flaky carbonyl iron/graphene oxide composite in S-band

In this paper, the microwave absorption properties of the flaky carbonyl iron/graphene oxide/calcium stearate (FCI/GO/CS) composite were studied. The microstructures were detected by scanning electron microscope (SEM) and Fourier transform infrared spectroscopy (FTIR), whereas and the electromagnetic parameters were measured by Agilent vector network analyzer (VNA) in the frequency range of 1-18 GHz. According to the transmission line theory, the ball milling sample, with 2 wt% calcium stearate (CS) and 2 wt% GO to flaky CIP, has a minimum reflection loss peak of - 11.2 dB with the bandwidth (B - 10 dB) is 0.7 GHz at the thickness of 2 mm. After 2 wt% CS is added, the impedance matching (Zr) curve of FCI/GO is closer to 1. Therefore, the FCI/ GO/CS composites can get better impedance matching properties. It is noted that the excellent electromagnetic wave absorption properties for FCI/GO/CS composites can be applied in S band.