Cermet coatings based on nanoparticles of Au or Ag in a stable dielectric matrix provide a combination of spectral-selectivity and microstructural stability at elevated temperatures. The nanoparticles provide an absorption peak due to their localized surface plasmon resonance and the dielectric matrix provides red-shifting and intrinsic absorption from defects. The matrix and two separated cermet layers combined add mechanical support, greater thermal stability and extra absorptance. The coatings may be prepared by magnetron sputtering. They have solar absorptance ranging between 91% and 97% with low thermal emittance making them suitable for application in solar thermal conversion installations.
M. Bilokur, A. Gentle, M. Arnold, M. Cortie, and G. Smith, "An advanced plasmonic cermet solar absorber for high temperature solar energy conversion applications," Proc. SPIE 10356, Nanostructured Thin Films X, 103560C (Presented at SPIE Nanoscience + Engineering: August 10, 2017; Published: 30 August 2017); https://doi.org/10.1117/12.2273598.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon