TY - JOUR
T1 - Infrared absorbance of vertically-aligned multi-walled CNT forest as a function of synthesis temperature and time
AU - Gheitaghy, Amir Mirza
AU - Ghaderi, Amir
AU - Vollebregt, Sten
AU - Ahmadi, Majid
AU - Wolffenbuttel, Reinoud
AU - Zhang, Guo Qi
PY - 2020/6
Y1 - 2020/6
N2 - 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.
AB - 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.
KW - Forest
KW - Growth temperature
KW - Growth time
KW - Infrared
KW - VA-MWCNT
UR - http://www.scopus.com/inward/record.url?scp=85079882187&partnerID=8YFLogxK
U2 - 10.1016/j.materresbull.2020.110821
DO - 10.1016/j.materresbull.2020.110821
M3 - Article
AN - SCOPUS:85079882187
SN - 0025-5408
VL - 126
JO - Materials Research Bulletin
JF - Materials Research Bulletin
M1 - 110821
ER -