Nanocomposites derived from silica and carbon for low temperature photothermal conversion

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• 作者：A. Charlot ; O. Bruguier ; G. Toquer ; A. Gr ; jean ; X. Deschanels
• 关键词：Selective solar absorber ; Nanocomposites ; Sol&ndash ; gel preparation ; Solar absorptance ; IR emissivity
• 刊名：Thin Solid Films
• 出版年：28 February, 2014
• 年：2014
• 卷：553
• 期：Complete
• 页码：157-160
• 全文大小：948 K

文摘

Carbon-oxide nanocomposite films have been fabricated using a sol-gel synthesis of hybrid precursors i.e. tetraethyl orthosilicate (TEOS) + methyl-尾-cyclodextrin (M尾CD) or colloidal zirconia + M尾CD, followed by carbonization in an inert atmosphere. Reflectance measurements were performed on these samples to determine solar absorptance (伪) and thermal emittance (蔚). The ratio 伪/蔚 was used to quantify the selectivity of the samples, the bigger this value the better the selectivity. The selectivity of the films was optimized according to various parameters such as the amount of M尾CD in the precursor, the thickness of the film or the surface roughness. The best value of 伪/蔚 was obtained for a TEOS + M尾CD film coated on a copper substrate.