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In this communication, novel hexanoic acid (HA) doped PAni micro/nanocomposites containing TiO 2 (dielectric filler, 30 nm) and Fe 3 O 4 (magnetic filler, 1 mm) that possess high conductivity, dielectric, and magnetic properties are reported. The micro/nanocomposites were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), ultraviolet (UV) spectrophotometer, thermogravimetric analysis (TGA), and scanning electron microscopy (SEM) analyses. The conductivity, dielectric, magnetic, and microwave absorption properties of the micro/ nanocomposites are discussed. The resultant nanorods/tubes shown in the SEM images indicate that PAni micro/ nanocomposites exhibit polymerization through elongation. The results show that synthesis parameters such as amount and particle size of TiO 2 and Fe 3 O 4 used significantly affect the morphology, conductivity, and microwave absorption property of the resultant PAni. PAni/HA/TiO 2 /Fe 3 O 4 with 40% of Fe 3 O 4 achieves the best performance of microwave absorption (greater than 99.4% absorption) at high frequency and suitable to be applied as a good microwave absorbing and shielding material.

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