Morphological Characterization of Anatase Thin Films
Abstract
This paper presents results obtained from the characterization of anatase selective surfaces to applications in solar collectors as well as a comparison with commercial selective surfaces. With the goal to authenticate Brazilian technology and/or a material with a low cost, expensive metal such as titanium and their oxides with high purity degree were replaced by a natural mineral based on titanium dioxide: anatase. Selective surfaces made of anatase were produced through e-beam at a pressure of 10-3 bar for 5 minutes. Images obtained by atomic force microscopy (AFM) and scanning electron microscopy (SEM) show nanostructured grains homogeneously distributed throughout the surface with diameter and height approximately 60 nm and 6 nm, respectively, and fractal dimensional of 2.10. Chemical analysis by EDX evidences the presences of Fe, Al, Ti, Si and their oxides homogeneously distributed. Optical absorbance of 85% points out that anatase surfaces hold efficiency in comparison to commercial surfaces.