Carbon nanotube terahertz spectroscopy: study of absorption and dispersion properties of SWNT and MWNT

Lamela, Horacio; Dadrasnia, Ehsan; Garet, Frédéric; Kuppam, Mohan Babu; Coutaz, Jean‐Louis

doi:10.1117/12.895221

Cited by 3 publications

(2 citation statements)

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“…Terahertz (THz) waves are electromagnetic waves with frequency and wavelength ranges of 0.1-10 THz and 30-3,000 µm, respectively. THz time-domain spectroscopy (THz-TDS) is a mature technology, which not only can directly obtain signal amplitude and phase with a high signal-to-noise ratio (greater than 60 dB) [1]. THz absorbing materials are essential in the feld of national security and information protection as well as having application potential in communications [2], signal modulation [3], imaging [4], and sensing [5].…”

Section: Introductionmentioning

confidence: 99%

“…Due to the excellent THz absorption characteristics of MWCNT [12], the transmission spectrum amplitude is small. In the existing literature [1], MWCNTs are usually treated in solid flms with micron thickness for research, while the characteristics of MWCNT aqueous dispersion are rarely studied. Te MWCNT aqueous dispersion has important applications in the felds of conductive flm preparation [22], composite material performance improvement [23], and wearable technology sensors [24].…”

Section: Introductionmentioning

confidence: 99%

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Terahertz Absorption Characteristics of Multiwalled Carbon Nanotube Aqueous Dispersion Measured by Microfluidic Technique

Qian

Zhou

et al. 2022

International Journal of Optics

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Multiwalled carbon nanotubes (MWCNTs) have excellent electronic, mechanical, and structural characteristics; however, their poor dispersion structure and large aggregates severely inhibit their function. A stable MWCNT dispersion in an aqueous solvent has been realized via ultrasonic dispersion and surfactant modification, providing a reference for improving MWCNT dispersion in various materials and solvents. In this study, a cyclic olefin copolymer with high transmittance to terahertz (THz) waves is used to prepare microfluidic chips. Then, the microfluidic and THz technologies are combined to study the THz absorption characteristics of MWCNT aqueous dispersion under different electric field (EF) intensities, magnetic field (MF) intensities, and MF action time. The results show that the THz spectral intensity of MWCNT aqueous dispersion decreases and the absorption coefficient increases with the increase of EF intensity, MF intensity, and MF action time. This phenomenon is explained from a microscopic perspective. The combination of microfluidic and THz technologies provides technical support for studying the characteristics of MWCNT aqueous dispersion and lays a foundation for elucidating the molecular microstructure of MWCNT aqueous dispersion.

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