Premium
Thermal Chemical Vapor Deposition of Superblack Randomly Oriented Carbon Nanotube Coatings
Author(s) -
Jagalur Basheer Hameeda,
Baba Kamal,
Bahlawane Naoufal
Publication year - 2020
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201900704
Subject(s) - carbon nanotube , chemical vapor deposition , materials science , deposition (geology) , infrared , reflection (computer programming) , carbon black , thermal , combustion chemical vapor deposition , carbon fibers , analytical chemistry (journal) , chemical engineering , thin film , nanotechnology , composite material , optics , carbon film , chemistry , composite number , organic chemistry , sediment , meteorology , computer science , biology , programming language , natural rubber , paleontology , physics , engineering
Multi‐walled carbon nanotubes (CNTs) are deposited via thermal chemical vapor deposition using cobalt catalyst and MgO promoter. A systematic investigation of the major processing parameters such as temperature (390–620 °C), pressure (3–10 mbar), injection (4–10 ms), and deposition times is performed. The impact of these parameters on the film density and optical properties of CNT coatings is discussed. Irrespective of the growth parameters, a homogeneous deposition of CNTs and a negligible impact on the CNTs’ quality are observed. Total hemispherical reflectance (THR) reveals a threshold thickness of 3 μm, above which the CNT films behave as an efficient black absorber in the UV–vis–near‐infrared (NIR) and mid‐infrared (MIR) spectral regions. Spatial and spectral integrations of THR show a reflection below 1% in the 250 nm–2.5 μm spectral range. The low reflection observed in the NIR is retained in the MIR up to λ = 10 μm.