Abstract
Development of RADAR absorbing materials (RAMs) is the most important research area in camouflage application mainly in Defence. Aniline was polymerized in presence of dodecylbenzene sulphonic acid (DBSA) as a functionalized protonic acid in water medium to form DBSA-doped polyaniline (PANI). Ni0.5Zn0.5Fe2O4 (NZF) nanoparticles were synthesized by co-precipitation method along with Bariun Titanate (BaTiO3) particles to form BaTiO3-Ni0.5Zn0.5Fe2O4 nanoparticles. Both DBSA-doped PANI and BaTiO3-Ni0.5Zn0.5Fe2O4 nanoparticles were thoroughly mixed in different ratios and the mixtures were dispersed in Epoxy Resin (LY556) matrices to produce RAMs. The spectroscopic characterization of the composite materials were examined by using X-ray diffraction (XRD), scanning electron microscope (SEM), Energy-dispersive X-ray spectroscopy (EDX), High resolution transmission electron microscopy (HR-TEM). The microwave absorbing properties return loss (dB) and important parameters such as complex relative permittivity (?r´ - j?r´´), complex relative permeability (µr´ - jµr´´) were measured in different microwave frequencies in X-band (8.2-12.4 GHz) region. The composite materials showed that a wider absorption frequency range and showed maximum return loss of -15.78 dB (>97% power absorption) at 10.8 GHz. The mechanism of microwave absorption occurs mainly due to the dielectric loss rather than magnetic loss.
Highlights
Development of RADAR absorbing material started in 1930s but commercial production started in 1950s
Both dodecylbenzene sulphonic acid (DBSA)-doped PANI and BaTiO3-Ni0.5Zn0.5Fe2O4 nanoparticles were thoroughly mixed in different ratios and the mixtures were dispersed in Epoxy Resin (LY556) matrices to produce RADAR absorbing materials (RAMs)
The spectroscopic characterization of the composite materials were examined by using X-ray diffraction (XRD), scanning electron microscope (SEM), Energy-dispersive X-ray spectroscopy (EDX), High resolution transmission electron microscopy (HR-Transmission electron microscopy (TEM))
Summary
Development of RADAR absorbing material started in 1930s but commercial production started in 1950s. Poly-aniline (PANI) was most widely studied due to its unique properties (Li et al, 2007; Mathur et al, 2001) It has high conductivity, high resistance to air, light weight, low cost, good electrical properties and good processibility (Li et al, 2008; MacDiarmid and Epstein, 1995; Aphesteguy and Jacobo, 2004). High resistance to air, light weight, low cost, good electrical properties and good processibility (Li et al, 2008; MacDiarmid and Epstein, 1995; Aphesteguy and Jacobo, 2004) It has used as electromagnetic interference (EMI) shielding, electro-catalyst, rechargeable battery, chemical sensors, and microwave absorption (Moghaddam and Nazari, 2008; Sarac et al, 2008). The developed RAMs showed the absorbing properties in a wide frequency range
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