Investigation of anisotropic reflectance from densified arrays of vertically aligned carbon nanotube forests (VACNTs)

Rana, Masud; Asyraf, M.R. Mohd; Saleh, Tanveer; Muthalif, Asan G. A.

doi:10.1016/j.cplett.2016.06.074

Cited by 2 publications

(2 citation statements)

References 16 publications

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“…Inhomogeneity structure induced multi-reflection between separated CNTs has been considered to be an important fact deciding the dark absorber effect of vertically aligned CNTs in the visible-infrared region38. Because the wavelength in the THz region is much larger, our model based on homogeneity assumption can fit the thin CNT film condition well.…”

Section: Resultsmentioning

confidence: 94%

Angular dependent anisotropic terahertz response of vertically aligned multi-walled carbon nanotube arrays with spatial dispersion

Zhou

Yiwen

et al. 2016

Sci Rep

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Spatial dispersion effect of aligned carbon nanotubes (CNTs) in the terahertz (THz) region has significance for both theoretical and applied consideration due to the unique intrinsically anisotropic physical properties of CNTs. Herein, we report the angular dependent reflection of p-polarized THz wave from vertically aligned multi-walled CNT arrays in both experiment and theory. The spectra indicate that the reflection depends on the film thickness of vertically aligned CNTs, the incident angle, and the frequency. The calculation model is based on the spatial dispersion effect of aligned CNTs and performed with effective impedance method and the Maxwell-Garnett approximation. The results fit well with the experiment when the thickness of CNT film is thin, which reveals a coherent superposition mechanism of the CNT surface reflection and CNTs/Si interface reflection. For thick CNT films, the CNTs/Si interface response determines the reflection at small incident angles, while the CNTs surface effect dominates at large incident angles. This work investigates the spatial dispersion effect of vertically aligned CNT arrays in the THz region, and paves a way for potential anisotropic THz applications based on CNTs with oblique incidence requirements.

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Section: Resultsmentioning

confidence: 94%

Angular dependent anisotropic terahertz response of vertically aligned multi-walled carbon nanotube arrays with spatial dispersion

Zhou

Yiwen

et al. 2016

Sci Rep

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“…The polarized reflectance from tip bent VACNTs at broadband wavelength has also been studied [5]. Furthermore, vertically aligned CNT arrays have received attention for their potential for introducing anisotropic reflectance properties [25]. Finally, the specular reflectance from arrays of VACNTs at different wavelengths over a range of incident angles has been studied [26].…”

Section: Introductionmentioning

confidence: 99%

Infrared absorbance of vertically-aligned multi-walled CNT forest as a function of synthesis temperature and time

Gheitaghy

Ghaderi

Vollebregt

et al. 2020

Materials Research Bulletin

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In this paper, the growth of optimized vertically aligned multi-walled carbon nanotube (VA-MWCNT) forests by LPCVD method for use in a large-area absorber in infrared detectors is presented. The effect of synthesis temperature (500−700°C) and time (1−10 min) on the optical absorption coefficient in the infrared (2−20 μm) is investigated by FT-IR measurement at various incident angles (15-80°). The structural properties of VA-MWCNT are characterized by SEM, TEM and Raman spectroscopy. Spectral measurements show an increasing absorption with the height of the forest that results at increased synthesis time and temperature. However, the absorption coefficient decreases with increasing synthesize time and temperature, while it is also affected by other properties, such as diameter, density, alignment, and uniformity. Moreover, the reduction in absorption at oblique incident angles demonstrates the relevance of surface properties. Finally, a circular graphite waveguide system is used to model the absorption characteristics of an MWCNT forest.

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Investigation of anisotropic reflectance from densified arrays of vertically aligned carbon nanotube forests (VACNTs)

Cited by 2 publications

References 16 publications

Angular dependent anisotropic terahertz response of vertically aligned multi-walled carbon nanotube arrays with spatial dispersion

Angular dependent anisotropic terahertz response of vertically aligned multi-walled carbon nanotube arrays with spatial dispersion

Infrared absorbance of vertically-aligned multi-walled CNT forest as a function of synthesis temperature and time

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