Carbon Nanotubes- Based Tandem Absorber with Tunable Spectral Selectivity: Transition from Near-Perfect Blackbody Absorber to Solar Selective Absorber
IR@NAL: CSIR-National Aerospace Laboratories, Bangalore
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| Title |
Carbon Nanotubes- Based Tandem Absorber with Tunable Spectral Selectivity: Transition from Near-Perfect Blackbody Absorber to Solar Selective Absorber
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| Creator |
Selvakumar, N
Krupanidhi, SB Barshilia, Harish C |
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| Subject |
Metals and Metallic Materials
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| Description |
Carbon nanotubes (CNTs) have good optical properties (i.e., absorptance (α) and emittance (ε) close to 1), high aspect ratios (>150), high surface area (470 m2/g) and high thermal conductivity (>3000 W/m.K), which enable rapid heat transfer from the CNTs to the substrates.[1-4] Various researchers have reported the usage of CNT forests for solar thermal energy conversion applications.[5-7] But the major disadvantage of using CNT forest for solar thermal applications is that they have poor spectral selectivity (i.e., α/ε = 1). CNTs with tunable spectral selectivity (i.e., high α in the visible region and low ε in the infrared region) and the effect of CNT lengths on their optical properties are emerging areas of research and have not been discussed in the literature. In the present work, we have grown CNT- based tandem absorber on stainless steel (SS 304) substrates and demonstrated the transition from near-perfect blackbody absorber to solar selective absorber by varying the thicknesses of CNTs and by suitably designing the bottom tandem absorber. The CNT based tandem absorbers exhibit higher thermal stability in vacuum as compared to the existing solar thermal coatings.
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| Publisher |
Wiley
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| Date |
2013
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| Type |
Journal Article
PeerReviewed |
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| Format |
application/pdf
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| Identifier |
http://nal-ir.nal.res.in/12050/1/ja469.pdf
Selvakumar, N and Krupanidhi, SB and Barshilia, Harish C (2013) Carbon Nanotubes- Based Tandem Absorber with Tunable Spectral Selectivity: Transition from Near-Perfect Blackbody Absorber to Solar Selective Absorber. Advanced Materials, 26 (16). pp. 2552-2557. ISSN 1521-4095 |
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| Relation |
http://onlinelibrary.wiley.com/doi/10.1002/adma.201305070/abstract
http://nal-ir.nal.res.in/12050/ |
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