A suitable amount of Pt - 0.2 mg/cm 2 on the surface of the nanotubes was deposited using magnetron sputtering. After anodization the heat treatment was performed at 450 oC for 1h to change amorphous structure of TiO 2 nanotubes into crystalline anatase structure. In this work titania nanotubes were obtained by electrochemical oxidation of pure titanium at voltage of 10 and 25 V, that resulted in creation of TiO 2 nanotubes with 40 and 110 nm in diameter, respectively.

Such nanostructured complex materials demand advanced methods for characterization and visualization of real structure, therefore application of TEM and electron tomography techniques is desired. Nanotube surface functionalization with platinum nanoparticles is a way to fabricate active material for catalysis of oxidation reaction of methanol. The possibility of the preparation of nanotubes with different size, shape and wall thickness leads to the control of their geometric surface area and specific surface area, which is an important parameter in the development of new substrates for example in heterogeneous catalysis. There is a direct linear relation between the anodization voltage and the average diameter of the formed nanotubes, as the voltage increases the diameter of nanotubes also increases. Their properties depend mostly on morphology which is relatively easy to change by controlling the conditions of the anodization like the type of electrolyte used, the voltage and the time of anodization. The titanium oxide nanotubes have become a very attractive material with potential applications in biomedicine, photocatalysis, energy etc. IM01-126 STEM electron tomography of titanium oxide nanotubes surface functionalized by Pt nanoparticles.

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