Print Email Facebook Twitter Infrared absorbance of vertically-aligned multi-walled CNT forest as a function of synthesis temperature and time Title Infrared absorbance of vertically-aligned multi-walled CNT forest as a function of synthesis temperature and time Author Mirza Gheytaghi, Amir (TU Delft Electronic Components, Technology and Materials) Ghaderi, M. (TU Delft Electronic Instrumentation; Chalmers University of Technology) Vollebregt, S. (TU Delft Electronic Components, Technology and Materials) Ahmadi, M. (TU Delft QN/Zandbergen Lab; Kavli institute of nanoscience Delft) Wolffenbuttel, R.F. (TU Delft Electronic Instrumentation; Chalmers University of Technology) Zhang, Kouchi (TU Delft Electronic Components, Technology and Materials) Date 2020-06-01 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. Subject ForestGrowth temperatureGrowth timeInfraredVA-MWCNT To reference this document use: http://resolver.tudelft.nl/uuid:7d177ebe-8ced-412d-ab0f-31694b6d6a0a DOI https://doi.org/10.1016/j.materresbull.2020.110821 Embargo date 2020-12-27 ISSN 0025-5408 Source Materials Research Bulletin, 126 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. Part of collection Institutional Repository Document type journal article Rights © 2020 Amir Mirza Gheytaghi, M. Ghaderi, S. Vollebregt, M. Ahmadi, R.F. Wolffenbuttel, Kouchi Zhang Files PDF 1_s2.0_S0025540819313017_main.pdf 3.2 MB Close viewer /islandora/object/uuid:7d177ebe-8ced-412d-ab0f-31694b6d6a0a/datastream/OBJ/view