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Electromagnetic performance, optical and physiochemical features of CaTiO3/NiO and SrFe12O19/NiO nanocomposites based bilayer absorber

Feng, L ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jcis.2021.11.127
  3. Publisher: Academic Press Inc , 2021
  4. Abstract:
  5. Herein, two distinct nanocomposites of CaTiO3 micro-cubes and polygonal SrFe12O19, both decorated with NiO nanoparticles, were successfully synthesized using hydrothermal method. The physico-chemical features of as-prepared samples were evaluated via XRD, FTIR, UV–vis, BET, XPS, FESEM and EDS analysis. Microwave attenuation features of as-prepared single layer absorbers were determined by VNA analysis in 2–18 GHz. Simulation confirmation was checked by preparing a bi-layer samples and evaluating it using VNA analysis after finding the appropriate thickness of each layer. The reflection loss from each single layer samples containing 20 wt% of each CaTiO3/NiO and SrFe12O19/NiO nanocomposites were −16 dB and −35 dB at 6.3 GHz with 2.5 mm matching thickness respectively. However, the RL was −34 dB at 10 GHz frequency with 2 mm thickness in a bilayer absorber with SrFe12O19/NiO nanocomposite layer put as absorbing layer with 1 mm thickness and CaTiO3/NiO positioned as matching layer with 1 mm thickness. Furthermore, at the X-band frequency, approximately entire band absorption is obtained. The findings demonstrate that adjusting the order and thickness of the layers in a bilayer absorber may readily improve microwave absorption performance. By comparing the results of simulation with real prepared bilayer absorbers, we found that with a 2 mm overall thickness, the bi-layer absorbers display accurate RL values, but not the matching frequency monitored in the simulation process. In reality, this discrepancy was unavoidable. © 2021 Elsevier Inc
  6. Keywords:
  7. Chemical analysis ; Iron compounds ; Nanocomposites ; Nickel oxide ; Perovskite ; Synthesis (chemical) ; Bi-layer ; Bilayer absorber ; CST suite ; Electromagnetic performance ; Hydrothermal methods ; NiO nanoparticles ; Optical features ; Physiochemical features ; Single layer ; Synthesised ; Strontium compounds
  8. Source: Journal of Colloid and Interface Science ; 2021 ; 00219797 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0021979721020415#!