Carbon nanotube-based tandem absorber with tunable spectral selectivity: transition from near-perfect blackbody absorber to solar selective absorber.
CVD grown CNT thin film with a thickness greater than 10 μm behaves like a near-perfect blackbody absorber (i.e., α/ε = 0.99/0.99). Whereas, for a thickness ≤ 0.4 µm, the CNT based tandem absorber acts as a spectrally selective coating (i.e., α/ε = 0.95/0.20). These selective coatings exhibit thermal stability up to 650 °C in vacuum, which can be used for solar thermal power generation.
Nanomaterials Research Laboratory, Surface Engineering Division, CSIR-National Aerospace Laboratories, Bangalore, -560 017, India; Materials Research Centre, Indian Institute of Science, Bangalore, -560 012, India.
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N
Selvakumar
S B
SB
Krupanidhi
Harish C
HC
Barshilia
blackbody absorber; carbon nanotubes; high temperature absorber coatings; reflectance; spectral selectivity