Synthesis and optical characterization of C-SiO2 and C-NiO sol-gel composite films for use as selective solar absorbers

G. Makiwa; G. Katumba; L. Olumekor

doi:10.1117/12.792654

11 September 2008 Synthesis and optical characterization of C-SiO₂ and C-NiO sol-gel composite films for use as selective solar absorbers

G. Makiwa, G. Katumba, L. Olumekor

Author Affiliations +

Proceedings Volume 7046, Optical Modeling and Measurements for Solar Energy Systems II; 70460A (2008) https://doi.org/10.1117/12.792654
Event: Solar Energy + Applications, 2008, San Diego, California, United States

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.

Citation Download Citation

G. Makiwa, G. Katumba, and L. Olumekor "Synthesis and optical characterization of C-SiO₂ and C-NiO sol-gel composite films for use as selective solar absorbers", Proc. SPIE 7046, Optical Modeling and Measurements for Solar Energy Systems II, 70460A (11 September 2008); https://doi.org/10.1117/12.792654

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