Abstract
ABSTRACT In this study tungsten trioxide has been synthesised as a thermal infrared (TIR) absorbent by sol–gel method and characterised by X-ray diffraction (XRD), field emission scanning electron microscopes (FESEM) and transmission electron microscopy (TEM). XRD analysis shows that the single phase and hexagonal tungstate was prepared. The crystallite size measured by Scherer formula is in good accordance with the crystallite nano size measured by TEM. The polyaniline (PANI) was coated on WO3/MnFe2O3 nanoparticles (NPs, 50/50 wt%) via in situ polymerisation by core-shell structure WO3/MnFe2O3/PANI nanocomposite (50% wt as core). Structural and morphological characteristics of the produced nanocomposite were studied via X-ray diffraction, Fourier transformation infrared spectroscopy and scanning electron microscopy. The electric property was also performed by four probe method. The results showed that the WO3/MnFe2O3/PANI nanocomposites have good electric property. The TIR absorption of nanocomposite was investigated at 10–40 µm frequencies. The TIR images testing showed that the ability of infrared thermal imaging was increased by increasing WO3/MnFe2O3 as core and independent to increasing PANI as final shell. The test microwave absorption properties of the nanoparticles powder dispersing in PANI and thickness of 1.5 mm were investigated by using a vector network analysers in the frequency range of 8–12 GHz. A minimum reflection loss of the nanocomposite reaches -12 dB were observed at 8.8 and 11.6 GHz, respectively.
Published Version
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