Fabrication of self-organized TiO₂ nanotubes by anodic oxidation and their photocatalysis

À´Ô´ÆÚ¿¯£ºÖйúÓÐÉ«½ðÊôѧ±¨(Ó¢ÎÄ°æ)2005ÄêµÚz3ÆÚ

ÂÛÎÄ×÷ÕߣºÌÕº£¾ü ÌÕ½Ü ÍôÌÎ ÍõÁá ÇØÁÁ Ðìè´è´

ÎÄÕÂÒ³Â룺462 - 466

Key words£ºanodic oxidation£» TiO₂ nanotubes£» annealing treatment£» photo-catalytic activity£» methyl orange

Abstract: Self-organized TiO₂ nanotubes were prepared on titanium foils at anodizing voltage of 20¤@V in 0.5% HF solution for 2030¤@min in order to provide a novel high-efficiency photocatalyst. And the resulting TiO₂ nanotubes, in periodic ring structures around their exteriors, are open on the top, while closed on the bottom. After annealing for 3¤@h in ambient atmosphere, the anatase phase was found, with the increasing content, in the originally amorphous TiO₂ nanotubes treated at 350, 400 and 450¤@¡æ; whereas the rutile phase emerged at 500¤@¡æ, and the nanotube architecture could be preserved till 550¤@¡æ. Furthermore, TiO₂ nanotubes, fabricated at anodizing voltage of 20¤@V for 20¤@min and then annealed at 400¤@¡æ, possesses the best photo-catalytic activity, i.e. the decolourisation of methyl orange irradiated for 40¤@min is 99.6%. ¸ü¶à

»ù½ðÐÅÏ¢£ºthe Natural Science Foundation of Jiangsu Province, China