Ultra-broadband shielding of cellulose nanofiber commingled biocarbon functional constructs: A paradigm shift towards sustainable terahertz absorbers

Pai, Avinash R.; Lu, Yuezhen; Joseph, Seena; Santhosh, N.; Degl’Innocenti, Riccardo; Lin, Hungyen; Letizia, Rosa; Paoloni, Claudio; Thomas, Sabu

doi:10.1016/j.cej.2023.143213

Cited by 10 publications

(5 citation statements)

References 43 publications

(36 reference statements)

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“…It should be pointed out that in the design, we chose the thicknesses of the PMM The absorber achieves near-zero transmittance while achieving strong absorptance with little reflectance over a broad frequency range from 1.78 to 10.0 THz, as shown in Figure 2b, indicating over 80% absorptance with an average absorptance of 92.6% and a broad absorptance bandwidth of 8.22 THz, making it suitable for ultra-wideband spectroscopy, energy harvesting, sensing, and high signal-to-noise ratio imaging applications, absorbing unwanted signals and enhancing reception capabilities. Additionally, the 7.5 THz peak absorption is up to 98.8%, which can also be utilized in THz spectroscopy to enhance signal-to-noise ratios [26], improve sensitivity [27], and enable precise measurements [28] of THz radiation.…”

Section: Resultsmentioning

confidence: 99%

Ultra-Wideband Terahertz Wave Absorber Using Vertically Structured IGIGIM Metasurface

Asif,

Wang,

Ouyang

et al. 2023

Crystals

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Achieving perfect absorption of electromagnetic waves across a wide range of frequencies is crucial for various applications, including sensing, imaging, and energy capture. In this study, we introduced a new concept for metasurfaces and proposed a six-layer vertically structured IGIGIM metasurface consisting of gold (Au), silicon (Si), graphene (G1), silica (SiO2), a second layer of graphene (G2), and polymethyl methacrylate (PMMA), which demonstrates ultra-wideband absorptance in the terahertz (THz) region. Through theoretical analysis and numerical simulations, we obtained broadband absorptance over 80% with the average absorptance of 92.6% and a bandwidth of 8.22 THz, from 1.78 to 10.0 THz. Whereas, dual broadband absorptance was obtained for above 90% with the bandwidth of 5.63 THz in the two sub-bands of 2.09–3.5 THz and 5.78–10 THz and above 95% with the bandwidth of 3.63 THz in the two sub-bands of 2.32–3.12 THz and 6.35–9.9 THz. Moreover, the proposed structure exhibits a polarization-independent absorption property. Also, it demonstrates a tolerance for the incident angle of 40 degrees, maintaining a wide absorption band. This remarkable feature is attributed to the multiple Fabry–Pérot resonance absorptions in the structure. Our study presents a convenient method for designing high-quality terahertz wave absorbers with outstanding broadband absorptance.

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Section: Resultsmentioning

confidence: 99%

Ultra-Wideband Terahertz Wave Absorber Using Vertically Structured IGIGIM Metasurface

Asif,

Wang,

Ouyang

et al. 2023

Crystals

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“…5a, b in transmission mode, terahertz waves undergo significant attenuation when passing through HMN composite films, which proves that HMN composite films have strong shielding performance for terahertz waves. Because of the signal-to-noise ratio, porosity of the material, and the special functional relationship between the SE and frequency, the EMI SE part fluctuates in the whole THz range [18,53,54]. However, within the range of 0.1-4 THz, the averaging THz EMI SE is 114.6 dB (Fig.…”

Section: Electromagnetic Properties Andmentioning

confidence: 99%

Hollow Metal–Organic Framework/MXene/Nanocellulose Composite Films for Giga/Terahertz Electromagnetic Shielding and Photothermal Conversion

Mai,

Chen,

Wang

et al. 2024

Nano-Micro Lett.

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With the continuous advancement of communication technology, the escalating demand for electromagnetic shielding interference (EMI) materials with multifunctional and wideband EMI performance has become urgent. Controlling the electrical and magnetic components and designing the EMI material structure have attracted extensive interest, but remain a huge challenge. Herein, we reported the alternating electromagnetic structure composite films composed of hollow metal–organic frameworks/layered MXene/nanocellulose (HMN) by alternating vacuum-assisted filtration process. The HMN composite films exhibit excellent EMI shielding effectiveness performance in the GHz frequency (66.8 dB at Ka-band) and THz frequency (114.6 dB at 0.1–4.0 THz). Besides, the HMN composite films also exhibit a high reflection loss of 39.7 dB at 0.7 THz with an effective absorption bandwidth up to 2.1 THz. Moreover, HMN composite films show remarkable photothermal conversion performance, which can reach 104.6 °C under 2.0 Sun and 235.4 °C under 0.8 W cm−2, respectively. The unique micro- and macro-structural design structures will absorb more incident electromagnetic waves via interfacial polarization/multiple scattering and produce more heat energy via the local surface plasmon resonance effect. These features make the HMN composite film a promising candidate for advanced EMI devices for future 6G communication and the protection of electronic equipment in cold environments.

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“…Previously, carbonaceous materials and MXenes have been widely reported in broadband EMI shielding owing to their high electrical conductivity. [11][12][13][14][15][16][17] However, these anticipated and promising properties are generated by several sophisticated and complicated synthesis processes on account of the unstable nature of aqueous solution of carbonaceous materials and MXenes. 18,19 Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS), one of the most reported and industrialized conductive polymers, possesses remarkable EMI shielding properties due to its high electron conductivity.…”

Section: Introductionmentioning

confidence: 99%

“…Previously, carbonaceous materials and MXenes have been widely reported in broadband EMI shielding owing to their high electrical conductivity. 11–17 However, these anticipated and promising properties are generated by several sophisticated and complicated synthesis processes on account of the unstable nature of aqueous solution of carbonaceous materials and MXenes. 18,19…”

Section: Introductionmentioning

confidence: 99%

“…(f) Tan d, (g) reflection loss value and (h) absolute value of 1 − Z of CG and PPK sponges. (i) Direct comparison of the THz EMI shielding performance of PPK sponges (marked as star) in this work with those of prevailing materials[14][15][16]45,[58][59][60][61][62][63][64][65] (marked as circles and squares), including MXene-dominated, carbon-dominated, metal-dominated and semiconductor-dominated materials.…”

mentioning

confidence: 99%

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An artificially re-structured PEDOT:PSS/konjac glucomannan sponge toward high-performance electromagnetic interference shielding from gigahertz to terahertz bands

Sun,

Wo,

et al. 2023

J. Mater. Chem. A

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Ultra-broadband shielding of cellulose nanofiber commingled biocarbon functional constructs: A paradigm shift towards sustainable terahertz absorbers

Cited by 10 publications

References 43 publications

Ultra-Wideband Terahertz Wave Absorber Using Vertically Structured IGIGIM Metasurface

Ultra-Wideband Terahertz Wave Absorber Using Vertically Structured IGIGIM Metasurface

Hollow Metal–Organic Framework/MXene/Nanocellulose Composite Films for Giga/Terahertz Electromagnetic Shielding and Photothermal Conversion

An artificially re-structured PEDOT:PSS/konjac glucomannan sponge toward high-performance electromagnetic interference shielding from gigahertz to terahertz bands

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