The Growth of TiO₂ Nanostructures Prepared by Anodization in Combination with Hydrothermal Method on the Ti Foil

¹ Program of Physics, Faculty of Science,Ubon Ratchathani Rajabhat University, Ubon Ratchathani, 34000, Thailand
² Deparment of Physics, Faculty of Science,Ubon Ratchathani University, Ubon Ratchathani, 34000, Thailand

^a chokekana14@gmail.com
^b cha16-thong@hotmail.co.th
^c udomt@hotmail.com

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.