Synthesis and Microwave Absorbing Properties of BaTiO3-PANI Composites

Nano-BaTiO3 and BaTiO3-PANI composites were prepared by sol-gel method and in-situ polymerization. The phase, structure and wave-absorbing property of the materials were analyzed and characterized by XRD, FT-IR and vector network analyzer (PNA). Results show that the samples are square crystalloid of nano-BaTiO3 and BaTiO3-PANI composites. The absorption ability of the BaTiO3-PANI composites is better than pure PANI in the frequency range of 0 — 6 000 MHz. When the mass ratio of BaTiO3 to PANI is 4.0 and absorption thickness is 3 mm, BaTiO3-PANI exhibits the best wave-absorbing property, of which the maximum absorption can reach -14.4 dB and the -5 dB bandwidth is 1 114 MHz.