Microwave attenuation of hydrogen plasma in carbon nanotubes

Babaei, S.; Solari, M. Sh.

doi:10.1063/1.3020692

Cited by 19 publications

(7 citation statements)

References 23 publications

(28 reference statements)

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“…It is clear that the microwave absorption coefficient of the magnetized hydrogen plasma moves from low to high frequencies when the magnetic field strength increases, which is completely different from the results obtained in Ref. 9. However, for = 90°the absorption peak decreases with increasing cyclotron frequency and moves from low to high frequencies, as shown in Fig.…”

Section: -3contrasting

confidence: 67%

“…5 On the other hand, CNTs produced via HiPco process have been extensively explored for potential applications in electromagnetic shielding or absorbing materials ͑around 2.45 GHz͒. [8][9][10][11][12][13][14][15] The HiPco process is a technique for catalytic production of CNTs in a continuous-flow gas phase using CO as the carbon feedstock and Fe͑CO͒ as the ironcontaining catalyst precursor. Imholt et al 11 and Wadhawan et al 12 reported that CNTs under vacuum ͑less than 10 −5 Torr͒ irradiated with a microwave field of 300 W produced a visibly bright plasma accompanied by rapid degassing of the CNTs.…”

Section: Introductionmentioning

confidence: 99%

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Microwave absorption of magnetized hydrogen plasma in carbon nanotubes

Moradi

2009

Physics of Plasmas

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Section: -3contrasting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Microwave absorption of magnetized hydrogen plasma in carbon nanotubes

Moradi

2009

Physics of Plasmas

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“…Therefore, finding an alternative way to fast-anneal VACNTs has become significant. Recently, CNTs have been found to display strong microwave absorption accompanied by a rapid temperature increase to above 1550 °C. − The strong microwave absorption by CNTs has recently attracted considerable interest for both theoretical research and potential applications, − especially for CNT functionalizations, − the mechanism being still open to question though. In the present study, we report the application of microwave radiation for VACNT fast annealing; the annealed CNTs show great improvements in mechanical and electrical properties.…”

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confidence: 99%

Microwave Makes Carbon Nanotubes Less Defective

et al. 2010

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An ultrafast microwave annealing process has been developed to reduce the defect density in vertically aligned carbon nanotubes (CNTs). Raman and thermogravimetric analyses have shown a distinct defect reduction in the CNTs annealed in microwave for 3 min. Fibers spun from the as-annealed CNTs, in comparison with those from the pristine CNTs, show increases of approximately 35% and approximately 65%, respectively, in tensile strength ( approximately 0.8 GPa) and modulus (approximately 90 GPa) during tensile testing; an approximately 20% improvement in electrical conductivity (approximately 80000 S m(-1)) was also reported. The mechanism of the microwave response of CNTs was discussed.

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“…For different external magnetic field intensities, the microwave absorption coefficients of the hydrogen plasma embedded inside HiPco CNTs have been calculated based on Eqs. ( 8), ( 9), ( 14), ( 15), ( 18), (21), and (22) in the frequency range from 0.3 GHz to 30.0 GHz.…”

Section: Resultsmentioning

confidence: 99%

The effects of a static magnetic field on the microwave absorption of hydrogen plasma in carbon nanotubes: a numerical study

Peng¹,

Xue-yu²,

Cheng³

et al. 2012

Chinese Phys. B

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We theoretically investigate the microwave absorption properties of hydrogen plasma in iron-catalyzed highpressure disproportionation-grown carbon nanotubes under an external static magnetic field in the frequency range 0.3 GHz to 30 GHz, using the Maxwell equations in conjunction with a general expression for the effective complex permittivity of magnetized plasma known as the Appleton-Hartree formula. The effects of the external static magnetic field intensity and the incident microwave propagation direction on the microwave absorption of hydrogen plasma in CNTs are studied in detail. The numerical results indicate that the microwave absorption properties of hydrogen plasma in iron-catalyzed high-pressure disproportionation-grown carbon nanotubes can be obviously improved when the external static magnetic field is applied to the material. It is found that the specified frequency microwave can be strongly absorbed by the hydrogen plasma in iron-catalyzed high-pressure disproportionation-grown carbon nanotubes over a wide range of incidence angles by adjusting the external magnetic field intensity and the parameters of the hydrogen plasma.

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Microwave attenuation of hydrogen plasma in carbon nanotubes

Abstract: Nitrogen and hydrogen plasma treatments of multiwalled carbon nanotubes

Cited by 19 publications

References 23 publications

Microwave absorption of magnetized hydrogen plasma in carbon nanotubes

Microwave absorption of magnetized hydrogen plasma in carbon nanotubes

Microwave Makes Carbon Nanotubes Less Defective

The effects of a static magnetic field on the microwave absorption of hydrogen plasma in carbon nanotubes: a numerical study

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