Abstract
We have investigated TiO2 nanostructures prepared by anodization in conjunction with hydrothermal method using Ti metal plates. The TiO2 nanoporus were fabricated by electrochemical anodization in a NH4F/EG4/H2O electrolyte system. Ultrasonic wave was used to clean the surface of TiO2 nanoporus in the medium of water after completing the anodization. After drying in air, the nanoporusarrays were calcined at 450 °C for 2 h in air. The TiO2 nanostructures were converted by hydrothermal in air.The TiO2 nanostructures were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). XRD patterns show the TiO2 anatase structure. SEM images indicate that the TiO2 structures depend on preparation temperatures. The density of TiO2 nanostructures increases as the time increases. The growth of TiO2 nanostructures was observed to be times dependence. The nanostructures are nanowires and nanospikes when the peraring time was 18 h, nanoflowers when the preparing time was 24h. This approach provides the capability of creating patterned 1D TiO2 nanowires at 18h. The diameter of TiO2 nanowires varies from 20 nm to 25 nm and length of several 250 nm.
Highlights
TiO2 nanostructures have attracted great attention due to their unique ability to form a variety of nanostructures such as nanowires, nanoribbons, nanobelts, nanospheres and nanofibers and their properties
Potentiostatic anodization is applied and subsequently the developed TiO2 nano tube are detached from the titanium foil leaving behind a pattern, where thenew tubes grow during the second anodization step [7]
The potentiostatic potentiostatic preparation of TiO2 nano tube has been further exploited for the guided anodization and fabrication of asymmetrical nanotubes onto patterned Ti foils treated by focused ionbeam lithography [9].The hydrothermal method is widely applied in titania nanotubes production because of its many advantages, such as high reactivity, lowenergy requirement, relatively non-polluting set-up and simple control of the aqueous solution [10]
Summary
TiO2 nanostructures have attracted great attention due to their unique ability to form a variety of nanostructures such as nanowires, nanoribbons, nanobelts, nanospheres and nanofibers and their properties. The ordered TiO2 nanostructures are expected to enhance the performance of various technologically important devices such as electroluminescent devices [1], photocatalysis [2] gas sensors [3], and third generation of solar cells [4,5] In this way, we prepared TiO2 on the Zn plates with 1D material constructed surface by this novel simple method. The potentiostatic potentiostatic preparation of TiO2 nano tube has been further exploited for the guided anodization and fabrication of asymmetrical nanotubes onto patterned Ti foils treated by focused ionbeam lithography [9].The hydrothermal method is widely applied in titania nanotubes production because of its many advantages, such as high reactivity, lowenergy requirement, relatively non-polluting set-up and simple control of the aqueous solution [10]. The hydrothermal method is amenable to the preparation of TiO2 nanotubes with different crystallite phases such as the anatase, brookite, monoclinic and rutile phases [12]
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