▎ 摘　　要

Polyaniline (PANI)/graphene oxide (GO) sandwich-like composite was synthesized for achieving higher microwave absorption performance using a one-step intercalation polymerization of aniline under acidic condition in the presence of GO layers with ammonium persulfate as an oxidant at various GO contents. Long-time mechanical stirring was adopted to obtain perfect sandwich-like structure. The samples were characterized by Scanning electron microscopy, Transition electron microscopy, X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy, 4-point probes resistivity measurements system and vector network analysis. The results revealed that the PANI-GO-PANI sandwich-like microstructures were successfully synthesized. The electromagnetic absorption properties were enhanced versus pristine PANI. The maximum reflection loss (RL) value reached -41.29 dB at 6.8 GHz with a thickness of 5 mm. The bandwidth (RL < -10 dB) attained an amazing 13.1 GHz from 4.9 to 18 GHz with suitable thickness. By controlling the content of GO, the average conjugation length of PANI nanorods on GO layers can be modulated, resulting in controllable wave-absorbing properties and various frequency bands.