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Proceedings Paper

Synthesis and optical characterization of C-SiO2 and C-NiO sol-gel composite films for use as selective solar absorbers
Author(s): G. Makiwa; G. Katumba; L. Olumekor
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Paper Abstract

We present a cheaper and environmentally friendly method to fabricate efficient spectrally selective solar absorber materials. The sol-gel technique was used to fabricate carbon-silica (C-SiO2) and carbon-nickel oxide (C-NiO) composite films on aluminium substrates. UV-Vis and FTIR spectrophotometers were used to determine the solar absorptance and thermal emittance of the coatings. C-NiO coatings gave the best spectral characteristics. We show that it is possible to achieve a solar absorptance of 0.94 and a thermal emittance of 0.12. So far, to our knowledge, no commercial spectral solar absorber has these spectral responses.

Paper Details

Date Published: 11 September 2008
PDF: 8 pages
Proc. SPIE 7046, Optical Modeling and Measurements for Solar Energy Systems II, 70460A (11 September 2008); doi: 10.1117/12.792654
Show Author Affiliations
G. Makiwa, Univ. of Zimbabwe (Zimbabwe)
G. Katumba, Council for Scientific and Industrial Research (South Africa)
L. Olumekor, Univ. of Zimbabwe (Zimbabwe)

Published in SPIE Proceedings Vol. 7046:
Optical Modeling and Measurements for Solar Energy Systems II
Benjamin K. Tsai, Editor(s)

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