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

Xiao, Dongyang; Wang, Qian; Wang, Zhaosong; Zhang, Yili; Wu, Jingbo; Fan, Kebin; Sun, Leimeng; Zhu, Minmin; Ng, Zhi Kai; Teo, Edwin Hang Tong; Hu, Fangjing

doi:10.1002/adom.202201363

Cited by 4 publications

(1 citation statement)

References 68 publications

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“…Materials based on CNTs aligned vertically on a substrate can be used in high-tech applications. They have been tested as cold cathodes for flat displays [ 3 , 4 , 5 ] and X-ray tubes [ 6 , 7 , 8 , 9 ], tip probes in scanning probe microscopy [ 10 , 11 ], electrode materials in supercapacitors and lithium-ion batteries [ 12 , 13 , 14 ], elements of biochemical sensors [ 15 , 16 ], and THz absorbers [ 17 ]. Recent reviews summarize the progress in the synthesis of vertically aligned CNTs [ 18 ] and their use in various fields [ 19 ], including biomedical applications [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Distribution of Iron Nanoparticles in Arrays of Vertically Aligned Carbon Nanotubes Grown by Chemical Vapor Deposition

et al. 2022

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Arrays of aligned carbon nanotubes (CNTs) are anisotropic nanomaterials possessing a high length-to-diameter aspect ratio, channels passing through the array, and mechanical strength along with flexibility. The arrays are produced in one step using aerosol-assisted catalytic chemical vapor deposition (CCVD), where a mixture of carbon and metal sources is fed into the hot zone of the reactor. Metal nanoparticles catalyze the growth of CNTs and, during synthesis, are partially captured into the internal cavity of CNTs. In this work, we considered various stages of multi-walled CNT (MWCNT) growth on silicon substrates from a ferrocene–toluene mixture and estimated the amount of iron in the array. The study showed that although the mixture of precursors supplies evenly to the reactor, the iron content in the upper part of the array is lower and increases toward the substrate. The size of carbon-encapsulated iron-based nanoparticles is 20–30 nm, and, according to X-ray diffraction data, most of them are iron carbide Fe3C. The reasons for the gradient distribution of iron nanoparticles in MWCNT arrays were considered, and the possibilities of controlling their distribution were evaluated.

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Section: Introductionmentioning

confidence: 99%

Distribution of Iron Nanoparticles in Arrays of Vertically Aligned Carbon Nanotubes Grown by Chemical Vapor Deposition

et al. 2022

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Large Area Flexible Thin Layer Terahertz Detector

Song

Zhou

Wang

et al. 2023

Adv Elect Materials

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Due to the low photon energy in the relevant frequency band, fewer materials can directly excite carriers, and an extreme lack of high-performance, large-area detectors, limit the promotion, and development of 6G technology. In addition, flexible detectors with the integration of 6G communication and Internet of Things technology has good prospects for application in the development of optoelectronic devices, which are also urgently needed. A large-area flexible thin layer terahertz detector is designed that combines the advantages of excellent optoelectronic performance in the detection of electromagnetic waves with low photon energy and the localized surface plasmon (LSP) effect in a sub-wavelength structure detector. Due to the large effective area, the spiral electrode device demonstrates the best performance at room temperature. The noise equivalent power (NEP) and photoresponsivity (R V ) are achieved with 0.4 pW Hz −1/2 and 154 MV W −1 at 0.28 THz. In addition, the bending experiments show that the device has extreme advantages for flexible 6G detector applications.

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Flexible Terahertz Broadband Absorber Based on a Copper Composite Film

Wei,

Hu,

Jiang

et al. 2024

ACS Appl. Mater. Interfaces

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Terahertz absorbers play a crucial role in terahertz detectors, radar stealth, electromagnetic shielding, and other fields. However, the design and fabrication of flexible terahertz broadband absorbers remain a challenge at present. Here, we demonstrated a terahertz broadband absorber based on a copper composite film (CCF) consisting of a copper foam and an organic silica gel doped with Fe 3 O 4 powder. The CCF can be fabricated by the infiltration method. The influence of the thickness and the pore size of the copper foam and the mass fraction of doped Fe 3 O 4 powder on the absorption bandwidth were investigated. When the thickness of the CCF is 1.5 mm, the pore size of the copper foam is 95 pores per inch (ppi), and the mass fraction of Fe 3 O 4 is 1%; a broadband absorption is achieved in the range of 0.11−3.5 THz. It is noted that the mass fraction of Fe 3 O 4 has a significant impact on the absorption bandwidth. In addition, the thickness of the CCF and the pore size of the copper foam also have an impact on the absorption. The impedance matching theory is introduced to understand the mechanism of broadband absorption. This flexible broadband absorber has potential application in terahertz stealth, shielding, and the sixthgeneration (6G) broadband wireless communication in the future.

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

Cited by 4 publications

References 68 publications

Distribution of Iron Nanoparticles in Arrays of Vertically Aligned Carbon Nanotubes Grown by Chemical Vapor Deposition

Distribution of Iron Nanoparticles in Arrays of Vertically Aligned Carbon Nanotubes Grown by Chemical Vapor Deposition

Large Area Flexible Thin Layer Terahertz Detector

Flexible Terahertz Broadband Absorber Based on a Copper Composite Film

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