Abstract
Abstract Ordered nanoporous anodic alumina (NAA) samples are fabricated by the two-step anodization process. The surface of NAA is modified by means of the spray pyrolysis of titanium dioxide (TiO2). The morphology and optical properties of the samples are investigated. UV–Vis-NIR reflectance of NAA and NAA coated with TiO2 has been both measured and simulated. The influence of pore diameter and thickness of both NAA and TiO2 in reflectance is analyzed. Pore diameters between 30 nm and 80 nm and thicknesses from 3 to 14 μm are evaluated for the NAA. TiO2 coating thicknesses from 87 nm to 438 nm are determined by the number of sprayed TiO2 layers. Samples up to 40 nm TiO2 coating exhibit an increase in the intensity of the oscillations produced by NAA. Whereas, thicker TiO2 coatings generate a modulated oscillating behavior in the UV–Vis-NIR region. Numerical simulation based on the Transfer Matrix Method has also been carried out to analyze the measured reflectance spectra. The porosity of films has been modeled using an effective medium approximation. It is found the importance of including some absorption in the UV–Vis zone of the NAA layers to obtain accurate predictions of the optical behavior of NAA.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
