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

Journal article (2020)

Authors

Amir Mirza Gheytaghi Electronic Components, Technology and Materials - EEMCS
M. Ghaderi Chalmers University of Technology, Electronic Instrumentation - EEMCS
S. Vollebregt Electronic Components, Technology and Materials - EEMCS
M. Ahmadi Kavli institute of nanoscience Delft, QN/Zandbergen Lab
R.F. Wolffenbuttel Electronic Instrumentation - EEMCS , Chalmers University of Technology
Kouchi Zhang Electronic Components, Technology and Materials - EEMCS
Research Group
Electronic Components, Technology and Materials (EEMCS) (TU Delft)
Copyright: © 2020 Amir Mirza Gheytaghi, M. Ghaderi, S. Vollebregt, M. Ahmadi, R.F. Wolffenbuttel, Kouchi Zhang
DOI
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https://doi.org/10.1016/j.materresbull.2020.110821
Infrared Forest Growth temperature Growth time VA-MWCNT
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Published Date

01-06-2020

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Electronic Components, Technology and Materials

Abstract

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.