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Open Access Structure and optical properties of carbon–TiO2 composite thin films by sol–gel method as solar selective absorbers

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C–TiO2 thin films as low cost solar selective absorbers were prepared by sol–gel method and post-annealing. Differential scanning calorimetry (DSC), Raman spectroscopy, X-ray diffraction (XRD), High-resolution transmission electron microscope (HR-TEM), Field emission scanning electron microscopy (FE-SEM), UV-Vis-NIR spectrophotometer are employed to characterize the structure and optical properties. The results illustrated that C–TiO2 composite thin films can be obtained after spinning and post-annealing. The solar absorptance (α) and thermal emissivity (ε) vary with carbon content and annealing conditions. The optimal annealing condition is 500 °C/2 h and the optimal carbon content is about 0.6 with α = 0.87 and ε = 0.13. C–TiO2 composite thin films own good thermal stability at 100 °C, which proves that it can be a good candidate as low-temperature solar selective absorbers.
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Document Type: Research Article

Publication date: December 1, 2013

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  • Materials Express is a peer-reviewed multidisciplinary journal reporting emerging researches on materials science, engineering, technology and biology. Cutting-edge researches on the synthesis, characterization, properties, and applications of a very wide range of materials are covered for broad readership; from physical sciences to life sciences. In particular, the journal aims to report advanced materials with interesting electronic, magnetic, optical, mechanical and catalytic properties for industrial applications.
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