Terahertz time-domain spectroscopy of thin and flexible CNT-modified MXene/polymer composites

Hussain, K.A.; Mehboob, Shoaib; Ahmad, Izhar; Mumtaz, Muhammad; Khan, Abdul Rehman; Mujtaba-ul-Hassan, Syed; Mehran, Muhammad Taqi; Ahmad, Jamal; Mehmood, Mazhar; Shahzad, Faisal

doi:10.1007/s00339-021-04525-6

Cited by 21 publications

(15 citation statements)

References 36 publications

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“… 2 The absorption peaks of the nanocomposite film slightly broadened compared to pure PVA film, revealing the physical interaction of the PVA functional groups with the MXenes functional groups. The broad and strong absorption peak in the range of 3600 to 3000 cm −1 corresponds to the strong hydrogen bonding of the hydroxyl group and OH stretching vibration 21 . The peak for CH stretching shifted from 2922 to 2918 cm −1 and the peak for CO bonding shifted from 1725 to 1714 cm −1 for the nanocomposite film 22 .…”

Section: Resultsmentioning

confidence: 96%

Dielectric, AC conductivity, and complex impedance spectroscopy studies of Ti₂CT_x MXene reinforced polyvinyl alcohol nanocomposites

Panda¹,

Deshmukh

Pasha³

2023

Polymers for Advanced Techs

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Herein, Ti2CTx MXene‐Polyvinyl alcohol (PVA) nanocomposite films with different weight percent (wt%) of MXene loadings were successfully prepared using the facile solution casting method. The structural, morphological, optical, thermal, and tensile properties of the nanocomposite films were analyzed using FTIR, XRD, Raman, SEM, UV–Vis spectroscopy, TG‐DTA, mechanical tests, and so forth. The variation in dielectric constant, loss tangent, and AC conductivity of the nanocomposite films was analyzed in the range of 1 Hz to 10 MHz with the variation of temperature (30–150°C) and MXene concentrations (5–20 wt%) using impedance spectroscopy. The nanocomposite films showed a very high dielectric constant in the range of ~105 for lower frequency and very low dielectric loss in the range of 0–1 for higher frequency (100 kHz–10 MHz). The dielectric constant, loss tangent, and AC conductivity values increased at a certain temperature and further decreased with increase in temperature. The increase in filler concentration increased the values of these investigated electrical parameters but at a concentration of 20 wt%, the nanocomposite films reached the percolation limit, and hence a slight reduction in the dielectric properties was noticed. Moreover, the complex impedance spectroscopy studies of the nanocomposite films were also carried out and their corresponding circuit diagrams were fitted according to the obtained cole‐cole plots.

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Section: Resultsmentioning

confidence: 96%

Dielectric, AC conductivity, and complex impedance spectroscopy studies of Ti₂CT_x MXene reinforced polyvinyl alcohol nanocomposites

Panda¹,

Deshmukh

Pasha³

2023

Polymers for Advanced Techs

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“…Finally, PA/TS@3 IL‐3 Ag‐3 rGO composites showed SE for 18.3 dB in 1.0 THz. The Ag, IL, and rGO in the micro channels supplied plentiful positions to carrier tunneling from one surface to another, then the electronic conductivity was increased, leading to more surficial reflections for incidence waves 34 . Besides, such conductive fillers generate interface polarization in TS fibers, which favored for absorbing of terahertz wave in the matrix 35 .…”

Section: Resultsmentioning

confidence: 99%

“…The Ag, IL, and rGO in the micro channels supplied plentiful positions to carrier tunneling from one surface to another, then the electronic conductivity was increased, leading to more surficial reflections for incidence waves. 34 Besides, such conductive fillers generate interface polarization in TS fibers, which favored for absorbing of terahertz wave in the matrix. 35 Lastly, the diffraction of THz waves may be enhanced by plenty of polar groups (amide) contained in the PA matrix.…”

Section: Emi Se For the Composites In Thz-bandmentioning

confidence: 99%

Flexible composites by ionic liquid/silver/graphene in towel‐gourd sponge fibers: Synergistic effect and dual‐band electromagnetic interference shielding in X‐band and terahertz‐band

Xiang

Zhu

Qin

et al. 2022

J of Applied Polymer Sci

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Flexible polymer composites applied to such dual‐band electromagnetic interference (EMI) shielding were prepared by a facile approach. Firstly, heterogeneous conducting framework was fabricated by incorporating reduced graphene oxide (rGO), silver (Ag) followed with ionic liquids (IL) sequentially in the micro channels of towel‐gourd sponge (TS) fibers to increase the synergistic effect in conductivity. After that, the TS fibers modified by rGO, Ag, and IL (TS@IL‐Ag‐rGO) were blended with melting polyamide elastomer (PA) matrix in the internal mixer to obtain the PA/TS@IL‐Ag‐rGO composites. The composites exhibited high‐EMI shielding effectiveness of 32.3 dB in X‐band and 18.3 dB in THz‐band with 12 wt% fillers content due to the synergistic effect in the heterogeneous conducting framework, which opens an avenue for stretchable materials applied in shielding electromagnetic waves in X‐band and THz‐band at the same time.

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“…31 Hussain et al prepared MXene/MWCNT/PVA composites and found 36 dB SE for 42 μm thick samples. 32 The literature reveals that controlling EMI pollution has always been a challenge for the researchers due to the ever-growing electronic equipment. The intended performance, reliability, and safety of equipment have always been the basis of EMI concern.…”

Section: ■ Introductionmentioning

confidence: 99%

“…They inferred that these materials could be efficiently used as THz absorption materials . Hussain et al prepared MXene/MWCNT/PVA composites and found 36 dB SE for 42 μm thick samples . The literature reveals that controlling EMI pollution has always been a challenge for the researchers due to the ever-growing electronic equipment.…”

Section: Introductionmentioning

confidence: 99%

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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Terahertz time-domain spectroscopy of thin and flexible CNT-modified MXene/polymer composites

Cited by 21 publications

References 36 publications

Dielectric, AC conductivity, and complex impedance spectroscopy studies of Ti₂CT_x MXene reinforced polyvinyl alcohol nanocomposites

Dielectric, AC conductivity, and complex impedance spectroscopy studies of Ti₂CT_x MXene reinforced polyvinyl alcohol nanocomposites

Flexible composites by ionic liquid/silver/graphene in towel‐gourd sponge fibers: Synergistic effect and dual‐band electromagnetic interference shielding in X‐band and terahertz‐band

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

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Terahertz time-domain spectroscopy of thin and flexible CNT-modified MXene/polymer composites

Cited by 21 publications

References 36 publications

Dielectric, AC conductivity, and complex impedance spectroscopy studies of Ti2CTx MXene reinforced polyvinyl alcohol nanocomposites

Dielectric, AC conductivity, and complex impedance spectroscopy studies of Ti2CTx MXene reinforced polyvinyl alcohol nanocomposites

Flexible composites by ionic liquid/silver/graphene in towel‐gourd sponge fibers: Synergistic effect and dual‐band electromagnetic interference shielding in X‐band and terahertz‐band

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

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Product

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Dielectric, AC conductivity, and complex impedance spectroscopy studies of Ti₂CT_x MXene reinforced polyvinyl alcohol nanocomposites

Dielectric, AC conductivity, and complex impedance spectroscopy studies of Ti₂CT_x MXene reinforced polyvinyl alcohol nanocomposites

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