A flexible and ultra-broadband terahertz wave absorber based on graphene–vertically aligned carbon nanotube hybrids

Xiao, Dongyang; Zhu, Min; Wang, Qian; Sun, Leimeng; Zhao, Chun; Ng, Zhi Kai; Teo, Edwin Hang Tong; Hu, Fangjing; Tu, Liangcheng

doi:10.1039/d0tc01023e

Cited by 21 publications

(18 citation statements)

References 41 publications

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“…For the consideration of practical applications, a THz shielding paint that is capable of strongly adhering on various substrates with fast film-forming property is preferable for irregular architectures, portable equipment, and compact devices. , Moreover, waterborne paint is superior to its organic counterparts in terms of the environmental issue. Previously, carbonaceous materials with high electron conductivity have been widely used for THz EMI shielding or absorption. ,− However, the natural hydrophobicity of carbonaceous materials makes them not suitable for fabricating waterborne shielding paint, and improving their hydrophilicity always deals with a decrease of the conductivity.…”

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confidence: 99%

Substrate-Independent Ti₃C₂T_xMXene Waterborne Paint for Terahertz Absorption and Shielding

et al. 2021

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With the development of terahertz (THz) technology, there is a booming demand of THz shielding/absorption materials to avoid electromagnetic interference (EMI) or pollution. Paints that can be fast solidified to form a film and stably adherent on arbitrary substrates are especially desired for the shielding/absorption applications. Recently, MXenes with high electron conductivity and hydrophilicity have attracted a great interest for EMI shielding. Here, we demonstrate a copolymer-polyacrylic latex (PAL) based MXene waterborne paint (MWP), which not only has strong THz EMI shielding/absorption efficiency but also can easily adhere onto various substrates that are commonly used in the THz band. The viscosity of MWP can be tuned by adjusting the colloidal and viscous forces, and the cyano group in PAL provides a strong intermolecular polar interaction between MWP and the substrate. As a result, a 38.3-μm-thick MWP on quartz exhibits EMI shielding value of 64.9 dB, and an excellent reflection-loss of 32.8 dB is obtained on MWP coated sponge foam. This substrate-independent MWP provides a simple and efficient way to achieving high-performance THz shielding/absorption.

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Substrate-Independent Ti₃C₂T_xMXene Waterborne Paint for Terahertz Absorption and Shielding

et al. 2021

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“…To achieve an ultra-wideband and flat power absorptance of the THz absorber for imaging purposes, the VACNT/PDMS/ Cu/PET multilayer structure is employed. [55,56] As shown in Figure 1a, the VACNT layer is deliberately used as the absorbing material to maximize the power absorptance of the THz absorber. PDMS, acting as an adhesion layer, is selected due to its flexibility and strong adhesion, as well as the low thermal conductivity to achieve a high spatial resolution.…”

Section: Fabrication and Characterizations Of Flexible Thz Absorbermentioning

confidence: 99%

Real‐Time THz Beam Profiling and Monitoring via Flexible Vertically Aligned Carbon Nanotube Arrays

Xiao

Wang

et al. 2022

Advanced Optical Materials

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In terahertz (THz) quasi‐optical systems, the real‐time profiling and visualization of THz beams is of great importance for beam focusing and collimation applications. Herein, a cost‐effective and room‐temperature‐operated THz imaging device for this purpose is demonstrated experimentally using a flexible and broadband THz absorber based on a vertically aligned carbon nanotube (VACNT) array. Excellent THz absorption performances with an average power absorptance >96.8% are achieved within 0.1 and 2.5 THz. The energy of the incident THz wave is absorbed by the THz absorber and converted into heat that will re‐radiate and can be detected by an infrared (IR) camera as a result of the THz‐to‐IR conversion mechanism. Real‐time THz beam imaging and monitoring applications are demonstrated by a series of experiments at both 0.1 and 0.3 THz, providing an alternative approach for real‐time beam profiling and monitoring of THz waves.

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“…As a flexible material, vertically aligned carbon nanotubes (VACNTs) are considered as one of the darkest man-made materials due to their ultra-low reflectivity within a wide range of wavelengths, [36,37] and have been widely used in the field of electromagnetic (EM) wave absorptions. [7,[38][39][40][41][42] However, two major problems exist for practical applications of VACNTs for THz wave absorptions. First, for a VACNT array with a certain thickness, as the wavelength increases, the absorption will decrease due to the fact that both the effective thickness and the absorbing area of the VACNT array decrease with respect to the wavelength.…”

Section: Introductionmentioning

confidence: 99%

A Flexible and Ultra‐Wideband Terahertz Wave Absorber Based on Pyramid‐Shaped Carbon Nanotube Array via Femtosecond‐Laser Microprocessing and Two‐Step Transfer Technique

Xiao

Chen

Sun

et al. 2022

Adv Materials Inter

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With the advances in THz technologies, THz functional devices and integrated systems put forward higher requirements for the development of filters, attenuators and absorbers, whose performance is dependent on the absorption characteristics of the device to the incident THz waves. [12] Therefore, absorbers have gained much interests among THz devices, and become one of the most important components for the applications mentioned above. Wide bandwidth coverage and high power absorptance are critical considerations to evaluate the performances of THz absorbers. These capabilities, however, are not readily available via the use of natural bulk materials. To be more specific, the refractive index of traditional bulk materials is typically greater than unity. [13] For materials that are widely used in THz systems, the refractive index of highresistivity silicon is approximately 3.4, [14] and the values for organic materials such as Polydimethylsiloxane (PDMS), [15,16] Polyethylene terephthalate (PET) and Polymide are between 1.5 and1.8. [17] Therefore, these materials are not ideal for THz absorbers as the former faces considerable surface reflections, [18] while the latter generally have low

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A flexible and ultra-broadband terahertz wave absorber based on graphene–vertically aligned carbon nanotube hybrids

Abstract: A flexible THz wave absorber based on G-VACNT hybrids is demonstrated for ultra-broadband THz wave absorption and imaging applications.

Cited by 21 publications

References 41 publications

Substrate-Independent Ti₃C₂T_xMXene Waterborne Paint for Terahertz Absorption and Shielding

Substrate-Independent Ti₃C₂T_xMXene Waterborne Paint for Terahertz Absorption and Shielding

Real‐Time THz Beam Profiling and Monitoring via Flexible Vertically Aligned Carbon Nanotube Arrays

A Flexible and Ultra‐Wideband Terahertz Wave Absorber Based on Pyramid‐Shaped Carbon Nanotube Array via Femtosecond‐Laser Microprocessing and Two‐Step Transfer Technique

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A flexible and ultra-broadband terahertz wave absorber based on graphene–vertically aligned carbon nanotube hybrids

Abstract: A flexible THz wave absorber based on G-VACNT hybrids is demonstrated for ultra-broadband THz wave absorption and imaging applications.

Cited by 21 publications

References 41 publications

Substrate-Independent Ti3C2TxMXene Waterborne Paint for Terahertz Absorption and Shielding

Substrate-Independent Ti3C2TxMXene Waterborne Paint for Terahertz Absorption and Shielding

Real‐Time THz Beam Profiling and Monitoring via Flexible Vertically Aligned Carbon Nanotube Arrays

A Flexible and Ultra‐Wideband Terahertz Wave Absorber Based on Pyramid‐Shaped Carbon Nanotube Array via Femtosecond‐Laser Microprocessing and Two‐Step Transfer Technique

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Substrate-Independent Ti₃C₂T_xMXene Waterborne Paint for Terahertz Absorption and Shielding

Substrate-Independent Ti₃C₂T_xMXene Waterborne Paint for Terahertz Absorption and Shielding