TiW alloy plates Ti:W = 91:9 atomic %, GKSS Forschungszentrum in Geesthacht, Germany were used as the substrate of mixed oxide nanotubes. The plates were first pretreated by polishing with silicon carbide abrasive paper, 6 m diamond abrasives, and colloidal silica, successively. Before use, all samples were sonicated in acetone, isopropanol, and methanol, followed by rinsing with deionized DI water and dried in a nitrogen stream. To obtain nanotube layers, anodization was carried out in a two-electrode system using a platinum plate as a counter electrode. The samples were contacted with a Cu backplate and then pressed against an O-ring in the wall of the electrochemical cell. The TiW alloy samples were anodized at a desired potential in a solution of EG Riedel-de Haen with 0.2 M HF 40 vol %, Merck. During the anodization, the temperature of TiW substrate was monitored by Pt 1000 sensor. The morphology of the formed nanotubes was characterized by a fieldemission scanning electron microscope SEM, Hitachi S4800. Ultrasonic treatment of the samples was performed for 1 min by agitating the samples in DI water using an ultrasonic agitator Branson, model 8510, 40 kHz.