碳酸钡-聚苯胺复合材料的制备及吸波性能

Synthesis and Microwave Absorbing Properties of BaTiO3-PANI Composites

摘要: 采用溶胶-凝胶法和原位聚合法制备纳米钛酸钡（BaTiO3）和钛酸钡-聚苯胺（BaTiO3-PANI）复合材料。通过X-射线衍射(XRD)、红外光谱(FT-IR)和矢量网络分析(PNA)等测试手段对材料的物相、结构和吸波性能进行了表征和分析。结果表明：制备出的样品分别为四方晶相的纳米BaTiO3和BaTiO3-PANI复合材料。在0~6 000 MHz，BaTiO3-PANI复合材料的吸波性能较纯PANI有了很大的提高。当m(BaTiO3)/m(PANI)=4.0，吸收厚度为3 mm时，BaTiO3-PANI复合材料的吸波性能最佳，其最大吸收峰值为-14.4 dB，-5 dB频宽为1 114 MHz。

Abstract: 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.