EFFECT OF VOLTAGE ON TiO2 NANOSTRUCTURED BY ELECTROCHEMICAL ANODIZATION

Abstract

In this work TiO2 nanotubes arrays were obtained by electrochemical anodization method using Ti foil, both anode and cathode, and under different anodization voltages. A mix of water and ethylene glycol as electrolyte was used at environment temperature for several times of reaction. Annealing process to TiO_2 samples were realized at temperature between 273 and 723 K without changes on morphological properties. Rutile and anatase phases were identified by X-ray diffraction measurements in all samples and a change of anatase to rutile phase was observed at biggest annealing temperature (T=723 k). From SEM measurements the inner diameter size for nanotubes were obtained, varying between 37 nm and 41 nm when anodizing voltage was alternant and constant, respectively. Nanotubes with ~6 um of length and 29.56 nm thickness of barrier layer were obtained as influence of the anodizition voltage of 80 V fixed; however nanotubes with bamboo form were observed at alternant voltage of 80 and 20 V during 1 minute and 5 minutes, respectively. A correlation between deposition parameters and morphological properties is presented.

Keywords

• TiO2
• Titanio
• Nanotubos