The Coating of Composite Nanoparticles of Bafe12o19/ MWCNT Using Silicon over Nowowen Substrtae for Radar Absorption In X And Ku Band

In current investigation a novel radar absorbing coating was developed on nonwoven fabric based on a composite nanomaterial of BaFe12O19/ MWCNT which was synthesized by combustive sol-gel technique. The functional carboxylated carbon nanotubes was utilized in silicon matrix and printed on fabric surface to enhance the intensity and band width of wave absorption. The microscopic images of the fabric coated magnetic nanoparticles shows a homogenous layer of nanoparticles on fabric surface. The maximum reflection drop of nanoparticles was recorded about -7 dB on 9.5 GHz. Moreover, the maximum absorption in X band was close to -38.45 dB in 10.5 GHz for samples with thickness of 1.5 mm and band width of 2.6 GHz. Meanwhile, the absorption property measurement indicates the maximum value for a thickness of 1.5 mm compared to other sample thickness. Moreover in Ku band, the maximum absorption for BaFe12O19/ MWCNT sample with thickness of 1.5 mm was reported on -31.38 dBm which was recorded on 15.9 GHz with Band width of 3.2 GHz. Therefore, the composite samples enhanced with hollow structure carboxylated CNT (10%w/w) not only shows improved electrical properties, but also endorse a higher maximum absorption value and band width. Interestingly, the fabric coated with bare BaFe12O19 nanoparticle, a maximum absorption value of -3.5 dBin was observed on 9.7 GHZ. In the meantime, the fabric coated with BaFe12O19/ MWCNT nanoparticle in X band region shows significant increase for absorbption value to -17.8 dB on 9.8 GHZ with bandwidth of 1.8 GHZ. However, the coated fabric with BaFe12O19 nanoparticle in Ku band shows lower value of -2.4 dB compared to X band in 17.6 GHZ. In comparisons, for composite nanoparticle coated sample, however, a nearly similar maximum value of -17.6 dB was recorded on 16.7 GHz with band width of 2.2 GHz. Therefore , results indicate that the fabric samples coated with composite BaFe12O19/ MWCNT nanoparticle compared to neat BaFe12O19  represents appreciable maximum absorption value of more than 90%  in X and Ku bands which can be attributed to presence of carbon structure in composite material.