Formation and performance of highly absorbing solar thermal coating based on carbon nanotubes and boehmite

Raj Kumar Bera, Subodh Gautam Mhaisalkar, Daniel Mandler*, Shlomo Magdassi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


A major component of solar thermal systems is the solar absorber, which converts light into heat. We report on achieving high absorptance, excellent adhesion, and high thermal stability of carbon nanotube-based black coatings by applying a layer of Boehmite (AlOOH) on top of the carbon nanotube (CNT) film by solution-processed spray deposition. The CNT layer made-up by spraying, functions as an absorbing layer and the AlOOH serves as an anti-reflecting and protecting film. The anti-reflecting property of AlOOH layer effectively increases the absorptance of CNT coating by decreasing the reflectance. The effect of the thickness of AlOOH layer on the absorptance, adhesion, and thermal stability of the resulting CNT/AlOOH coating was investigated. The CNT/AlOOH coating with optimized thickness of AlOOH layer shows very high absorptance (α) of 0.975. The adhesion of the coating is in the range of 95-100% with significant increase of thermal stability. This new approach is expected to open new possibilities for fabricating low-cost, highly efficient and thermally stable solar-thermal devices which are based on simple coating processes.

Original languageAmerican English
Pages (from-to)287-293
Number of pages7
JournalEnergy Conversion and Management
StatePublished - 15 Jul 2016

Bibliographical note

Publisher Copyright:
© 2016 Elsevier Ltd. All rights reserved.


  • Boehmite
  • Carbon nanotubes
  • Coating
  • Solar thermal


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