Optical Properties in Anodized Aluminum Oxide Films

In this work were prepared samples of aluminum oxide, using electrochemistry technique of anodization obtaining different thicknesses. The morphology of the specimens was characterized through scanning electronic microscopy (SEM). The individual composition of the formed structure was determined using energy dispersive Rx (EDX) spectroscopy and optical properties of Nanoporous films were studied by measurements of transmittance in the region of ultraviolet visible. The diameter of the pores is approximately (22.6 ± 4.7) nm and depth of pores ranging from 9 to 54 mm. For all the prepared samples, the average transmittance in the region of the visible (400-700 nm) is around (50 - 74) %. The energy band gap is approximately in 6.5 eV indicating that exist unoccupied states due to vacancy of oxygen, which function as electron traps and hole.