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