Abstract: The novel flower-like CuS/PANI composites with core-shell structure are prepared through in-situ polymerization of PANI on the surface of flower-like CuS microspheres. The electromagnetic interference (EMI) shielding effectiveness (SE) of the prepared composites are studied. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), Fourier transform infrared (FTIR) spectroscopy, UV-Vis optical absorption spectroscopy, and thermogravimetric analysis (TG) are used to characterize the obtained composites. The results reveal that flower-like CuS is uniformly coated by PANI shell and the interaction between CuS and PANI exists. Most importantly, compared with original CuS and pure PANI, the novel flower-like PANI/CuS composites exhibits remarkably enhanced shielding effectiveness against electromagnetic interference. The shielding effectiveness of PANI/CuS is closely related to the mass fraction of CuS. When the mass fraction of CuS is 50% and the thickness of matching layer is 3 mm, the shielding effectiveness of PANI/CuS is below -18 dB in the frequency range of 300 KHz to 3 GHz and the maximum loss of electromagnetic interference reaches -45.2 dB at around 2.78 GHz.
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