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Structure, stability and electronic properties of TiO2 nanostructures

“…At present there have been developed various approaches for the synthesis of titania NTs using various precursors [11 -17], carbon nanotubes, porous alumina or polymer membranes as templates [18][19][20][21][22][23][24], fabrication by anodic oxidation of Ti [25][26][27], sol-gel technique [28 -32] and sonochemical synthesis [33]. Such variety of methods for the synthesis of the TiO 2 NTs causes a large variety of morphology and probably properties of the nanotubes.…”

Pure rutile nanotubes

“…8 Titania nanotubes have already been used in some applications 9,10 however their structures have been either anatase or a TiO x polymorph. 11,12 Such tubes were produced by hydrothermal treatment of TiO 2 with NaOH at temperatures between 110 uC and 150 uC, 13 anodic oxidation of titanium foils 14 or a sol-gel process 15 using either alumina, 16 cholesterol-based aggregates 17 or carbon nanotubes 18 as templates. A specific attempt to change anatase into rutile nanotubes by heating found that the tube morphology collapsed with loss of structural control.…”

Photocatalytic acetaldehyde oxidation in air using spacious TiO2 films prepared by atomic layer deposition on supported carbonaceous sacrificial templates

“…Alternative approaches that have been applied for coating CNTs such as the sol-gel method [19,20], often lead to rough and thick TiO 2 layers. In our samples, transformation of as-deposited amorphous TiO 2 into photoactive anatase by calcination coincided with burning the underlying sacrificial carbon template [21,22]. Simultaneously a remarkable morphology change of the TiO 2 layer took place.…”