Microwave absorption behaviour of MWCNT based nanocomposites in X-band region

Abstract

Multiwall carbon nanotube (MWCNT) based nanocomposites were prepared by a two-step process. Firstly, titanium dioxide (TiO2) coated MWCNT was prepared via sol-gel technique. In the second step, the acid modified MWCNTs were dispersed in the thermoplastic polyurethane matrix by solution blending process. Characterizations of the nanocomposites were done by X-ray diffraction analysis, X-ray photoelectron spectroscopy, Scanning Electron Microscopy, Transmission Electron Microscopy and Energy-dispersive X-ray spectroscopy. Microwave absorption studies of the nanocomposites were carried out in X-band region. The microwave absorption result was discussed with the help of complex permittivity and permeability of the prepared radar absorbing material (RAM). The result showed superior microwave absorption property of the composite containing both TiO2 coated MWCNT and magnetite (Fe3O4). This result is due to the effective absorption of both electrical and magnetic components of the microwave. RAM-MW, RAM-Ti, RAM-Ti@MW and RAMTi@ MW/Fe and showed the maximum reflection loss of –16.03 dB at 10.99 GHz, –8.4 dB at 12.4 GHz, –36.44 dB at 12.05 GHz and –42.53 dB at 10.98 GHz respectively. Incorporation of MWCNT enhanced the thermal stability of the composite which has been confirmed by thermogravimetric analysis

High temperature electromagnetic and microwave absorbing properties of polyimide/multi-walled carbon nanotubes nancomposites

“…However, most studies in literature on absorbing materials were performed in polyaniline [11], epoxy [12], polyamide resins [13], nature rubber [14] and so on [15], and those polymeric matrix could not use at elevated temperature due to their low thermal stability, therefore choose a kind of high heat resistance polymer is needed. Penylethynyl terminated polyimides, which account for many high performance polymer systems, are noted for their thermo-oxidative stability, high wear resistance, excellent electrical properties and high mechanical properties [16,17].…”

Fabrication of graphite-graphene-ionic liquid modified carbon nanotubes filled natural rubber thin films for microwave and energy storage applications

“…Many research reports have been published on graphene and CNT filled polymer composites [14][15][16][17]. Core amount of research work has been devoted to microwave dielectric properties of CNT filled polymer composites [18][19][20]. However, to date, no study has been unveiled based on graphene and ionic liquid modified multi walled carbon nanotubes (IMCNTs) hybrid filled natural rubber (NR) system associated with dielectric studies at microwave frequencies.…”

Tuning of Microwave Absorption Properties and Electromagnetic Interference (Emi) Shielding Effectiveness of Nanosize Conducting Black-Silicone Rubber Composites Over 8-18 GHZ

“…Similar observations are reported in [3], wherein other filler materials viz. BaTiO 3 , Fe(Co) 5 , nanosize Fe and ferrites were used along with CB in composites to achieve enhanced bandwidth. The other filler materials, with higher density, result in the increase in the overall weight of the composites to achieve the same performance.…”

“…Further, different carbon allotropes viz. carbon nanotubes (CNTs), carbon fibers (CFs) and graphene based composites also have certain difficulties including dispersion of filler in host matrix, reproducibility of functional properties, production of bulk quantity and cost effectiveness, thereby, limiting their extensive practical applications [4][5][6][7][8][9][10][11].…”