Thermal infrared and microwave absorbing properties of SrTiO3/SrFe12O19/polyaniline nanocomposites

Abstract

Polyaniline (PANI) as a unique polymer that also has electromagnetic absorption used as the substrate. In this research, SrTiO3 was synthesized as IR absorbent and core and then SrFe12O19 as microwave absorbent was prepared on SrTiO3 via co-precipitation method as the first shell. As the next step, PANI was coated on SrTiO3/SrFe12O19 nanoparticles via in situ polymerization by multi core–shell structures (SrTiO3/SrFe12O19/PANI). Nanometer size and structures of samples were measured by TEM, XRD and FTIR. Morphology of nanocomposite was showed by SEM images. The magnetic and electric properties were also performed by VSM and four probe techniques. Thermal infrared (IR) absorption and microwave reflection loss of nanocomposites were investigated at 10–40μm and 8–12GHz, IR and microwave frequencies, respectively. The results showed that the SrTiO3/SrFe12O19/PANI nanocomposites have good compatible electric and magnetic properties and hence the microwave absorbency shows wide bandwidth properties. The infrared thermal image testing showed that the function of infrared thermal imaging was optimized by increasing SrTiO3/SrFe12O19 as core and independent to increasing PANI as the final shell.