Studies on electromagnetic wave absorption characteristics of PMMA-CNF nanocomposite films in terahertz frequency range

Rubab, Najaf; Mumtaz, Muhammad; Zakria, M.; Ahmad, Izhar; Khan, Sikandar; Shahzada, Shaista; Raffi, Muhammad

doi:10.1007/s00339-021-05110-7

Cited by 3 publications

(6 citation statements)

References 38 publications

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“…The time-domain data are transformed into frequency-domain data with Fourier transformation using MATLAB, which is used to calculate the shielding effectiveness using the following relation , normalS normalE = normalS normalE normalA + normalS normalE normalR + normalS normalE normalM normalR …”

Section: Results and Discussionmentioning

confidence: 99%

“…Table S1, in Supporting Information, indicates the direct relationship between the sample thickness and delay. The time-domain data are transformed into frequencydomain data with Fourier transformation using MATLAB, which is used to calculate the shielding effectiveness using the following relation 46,47…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

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Polymeric Fe₃O₄ Nanoparticle/Carbon Nanofiber Hybrid Nanocomposite Coatings for Improved Terahertz Shielding

Arooj

Khan

Mumtaz

et al. 2023

ACS Appl. Nano Mater.

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With the rapid advancement in THz technology and continuously increasing number of electrical and electronic devices in this frequency band, highly efficient and functional THz shielding materials are required to ensure the intended working of these devices. Polymeric composites of hybrid nano-fillers including CNFs and magnetic nanoparticles possess distinctive capability of providing high shielding efficiency primarily absorptive in nature with field functional properties. In this article, lightweight polymeric nanocomposite coatings of continuous carbon nanofibers and magnetite (Fe3O4), as potential shielding material for the THz frequency band, have been prepared using a cost-effective conventional air-spray coating method. The obtained results are quite exclusive, as the sample with 40 wt % Fe3O4 outperforms at a very low thickness value of 540 μm, showing the highest SE value of ∼60 dB. These results are superior compared to the results obtained from most of the contemporary polymer composite materials, which usually provide good shielding at high thickness values in the mm range. Also, this study establishes that shielding performance of the polymeric hybrid nanocomposites (Fe3O4 + CNFs) is substantially better than a single nanocomposite CNF filler previously synthesized and characterized through the same approach.

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Section: Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

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Polymeric Fe₃O₄ Nanoparticle/Carbon Nanofiber Hybrid Nanocomposite Coatings for Improved Terahertz Shielding

Arooj

Khan

Mumtaz

et al. 2023

ACS Appl. Nano Mater.

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“…9 The millimeter waves (0.1-0.3 THz) are already being used for spectroscopy, imaging, non-destructive quality testing, surveillance and 5G data communication, so this frequency band is fairly technologically advanced. 10 The sub-millimeter THz band (0.3-3 THz), on the other hand, is now witnessing industrial expansion due to ongoing research activities in this band. 11 This suggests the ultimate need of THz shielding materials which could provide high attenuation to these sub-millimeter waves providing a safe EM environment to the devices functioning in this band.…”

Section: Introductionmentioning

confidence: 99%

“…For example, this band is considered as a favorable band for communication of ultrahigh speed data with data rate in terabits per second 9 . The millimeter waves (0.1–0.3 THz) are already being used for spectroscopy, imaging, non‐destructive quality testing, surveillance and 5G data communication, so this frequency band is fairly technologically advanced 10 . The sub‐millimeter THz band (0.3–3 THz), on the other hand, is now witnessing industrial expansion due to ongoing research activities in this band 11 .…”

Section: Introductionmentioning

confidence: 99%

Optimizing electromagnetic interference shielding ofcarbon nanofibersreinforced nylon 6, 6 nanocomposite films in terahertz range

Arooj

Mumtaz

Rehman

et al. 2023

J of Applied Polymer Sci

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The widespread development and usage of electrical and electronic devices in THz frequency band has instigated great concerns regarding the anticipated functioning of devices. The world is in dire need to develop tunable shielding materials which are not only field functional but could also provide shielding against undesired electromagnetic signals by absorption as the primary mechanism. In this work, nylon 6,6 based hybrid nanocomposite films loaded with 0–50 wt% CNFs have been prepared on the cellulosic substrates by air spray coating technique. XRD and FESEM results have established formation of crystalline films having homogeneously distributed CNFs in the polymer matrix leading to formation of an efficient conductive network. IV measurements demonstrate a significant rise in the dc conductivity in the polymer nanocomposite samples with the gradual increase of CNF content in comparison to the pristine sample. Interestingly, sample containing 50 wt% CNFs has shown dc conductivity value of 0.03 Scm−1 while shielding effectiveness (SE) of 44 dB obtained through THz‐TDS. The results hold a distinctive position in these samples which have outperformed at a very low thickness of ~570 μm as compared to the results obtained by many other novel polymer composites and present themselves a light weight field functional high THz absorption materials.

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Investigation of dielectric properties and conductivity of polyvinyl chloride composites by terahertz time-domain spectroscopy

Zhang,

Zheng,

Zhang

et al. 2024

Polymer Testing

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Studies on electromagnetic wave absorption characteristics of PMMA-CNF nanocomposite films in terahertz frequency range

Cited by 3 publications

References 38 publications

Polymeric Fe₃O₄ Nanoparticle/Carbon Nanofiber Hybrid Nanocomposite Coatings for Improved Terahertz Shielding

Polymeric Fe₃O₄ Nanoparticle/Carbon Nanofiber Hybrid Nanocomposite Coatings for Improved Terahertz Shielding

Optimizing electromagnetic interference shielding ofcarbon nanofibersreinforced nylon 6, 6 nanocomposite films in terahertz range

Investigation of dielectric properties and conductivity of polyvinyl chloride composites by terahertz time-domain spectroscopy

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Studies on electromagnetic wave absorption characteristics of PMMA-CNF nanocomposite films in terahertz frequency range

Cited by 3 publications

References 38 publications

Polymeric Fe3O4 Nanoparticle/Carbon Nanofiber Hybrid Nanocomposite Coatings for Improved Terahertz Shielding

Polymeric Fe3O4 Nanoparticle/Carbon Nanofiber Hybrid Nanocomposite Coatings for Improved Terahertz Shielding

Optimizing electromagnetic interference shielding ofcarbon nanofibersreinforced nylon 6, 6 nanocomposite films in terahertz range

Investigation of dielectric properties and conductivity of polyvinyl chloride composites by terahertz time-domain spectroscopy

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Polymeric Fe₃O₄ Nanoparticle/Carbon Nanofiber Hybrid Nanocomposite Coatings for Improved Terahertz Shielding

Polymeric Fe₃O₄ Nanoparticle/Carbon Nanofiber Hybrid Nanocomposite Coatings for Improved Terahertz Shielding