Comparative study of single- and double-layer BaFe12O19-Graphite nanocomposites for electromagnetic wave absorber applications. (June 2020)

• Record Type: Journal Article
• Authors: Ismail, Ismayadi; Ibrahim, Idza Riati; Matori, Khamirul Amin; Awang, Zaiki; Muhammad Zulkimi, Muhammad Misbah; Mohd Idris, Fadzidah; Nazlan, Rodziah; Azis, Raba'ah Syahidah; Mohd Zaid, Mohd Hafiz; Rusly, Siti Nor Ain; Ertugrul, Mehmet
• Is Part Of: Materials research bulletin. Volume 126(2020)
• Publication Date: 2020-06
• Subjects: Barium hexaferrite -- Reflection loss -- Microwave absorbers; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2020.110843
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: a) Single-layer nanocomposites structure of ferrite + graphite, (b and c) Double-layer nanocomposites structure of ferrite/graphite as matching and absorbing layers. Highlights: Single- and double-layer BaFe12 O19 -Graphite nanocomposite were prepared. Microwave absorbing properties characterised in 8−18 GHz (X- and Ku-band). 2 mm of single-layer samples with reflection loss of -20.5 dB at 11.8 GHz. Double-layer samples showed reflection loss of -30.0 dB at 9.2 GHz. Microwave absorption properties attributed to dielectric loss and magnetic loss. Abstract: The development of stealth technology for military applications and increasing concerns of electromagnetic pollution have garnered interest to design microwave absorbing materials with wide absorption bandwidth and effective absorption properties. Two batches of samples as a potential radar absorbing material were prepared in this study: single-layer and double-layer nanocomposite mixtures of graphite and barium hexaferrite nanoparticles. Characterizations of electromagnetic and microwave absorbing properties were carried out in the frequency range of 8−12 GHz (X-band) and 12−18 GHz (Ku -band). Single-layer samples with thickness of 2 mm showed optimal absorption properties with minimum reflection loss of -20.5 dB at 11.8 GHz for X-band and -20.7 dB at 14.7 GHz for Ku -band, displaying bandwidths of 0.6 GHz for the former and 3.8 GHz for the latter at -10 dB. On the other hand, double-layer samples made of 1 mm thick barium hexaferrite matching layer and 2 mm thick graphite absorbing layer showed optimal absorption properties with minimum reflection loss of -30.0 dB at 9.2 GHz for X-band with narrower bandwidth of 0.6 GHz. The microwave absorption properties of these nanocomposites were attributed to combined effect of dielectric loss from graphite and magnetic loss from ferrite.