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

Amir Mirza Gheitaghy*, Amir Ghaderi, Sten Vollebregt, Majid Ahmadi, Reinoud Wolffenbuttel, Guo Qi Zhang

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)
11 Downloads (Pure)

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.

Original languageEnglish
Article number110821
Number of pages10
JournalMaterials Research Bulletin
Volume126
DOIs
Publication statusPublished - 1 Jun 2020

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

  • Forest
  • Growth temperature
  • Growth time
  • Infrared
  • VA-MWCNT

Fingerprint

Dive into the research topics of 'Infrared absorbance of vertically-aligned multi-walled CNT forest as a function of synthesis temperature and time'. Together they form a unique fingerprint.

Cite this