Characterization of microwave absorption in carbon nanotubes using resonance aperture transmission method
| Autor: | Davide Mariotti, Ruairi McGlynn, Oleksandr Malyuskin, Paul Maguire, Paul Brunet |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Permittivity
Waveguide (electromagnetism) Materials science Aperture FOS: Physical sciences General Physics and Astronomy Applied Physics (physics.app-ph) 02 engineering and technology Carbon nanotube 01 natural sciences law.invention Condensed Matter::Materials Science law 0103 physical sciences SDG 7 - Affordable and Clean Energy Absorption (electromagnetic radiation) 010302 applied physics business.industry Resonance Physics - Applied Physics Microwave transmission 021001 nanoscience & nanotechnology Optoelectronics 0210 nano-technology business Microwave |
| Zdroj: | Malyuskin, O, Brunet, P, Mariotti, D, McGlynn, R & Maguire, P 2020, ' Characterization of microwave absorption in carbon nanotubes using resonance aperture transmission method ', Journal of Applied Physics, vol. 128, no. 4, 045109 . https://doi.org/10.1063/5.0002414 |
| DOI: | 10.1063/5.0002414 |
| Popis: | A new method to characterize microwave electromagnetic (EM) absorption of a bulk carbon nanotube (CNT) material is proposed and experimentally evaluated in this paper. The method is based on the measurement of microwave transmission through a capacitive-resonator aperture (CRA) in a conductive screen loaded with a CNT sample under test. This method allows us to measure microwave permittivity and absorption of thin samples (∼0.1 μm–10 μm thick) with linear dimensions much smaller than the wavelength of radiation in free space. This “minimal” sample requirement restricts the application of conventional microwave characterization methods such as free-space or waveguide permittivity characterization. It is demonstrated that the resonance E-field enhancement inside the CRA leads to strong EM interaction of the microwave E-field with the CNT sample under test, thus enabling high sensitivity and dynamic range (∼5 dB) of the measurement procedure. Another advantage of the proposed technique over conventional non-resonance characterization methods is that in the resonance transmission band, the CRA operation is reflection-less, which leads to a relatively simple qualitative algebraic de-embedding procedure of the material parameters based on the principle of energy conservation. The experimental microwave absorption data of the multiwall CNT samples are presented in the S frequency band (2–4 GHz), demonstrating microwave absorption properties of the multiwall CNT ribbons. |
| Databáze: | OpenAIRE |
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