阳极氧化制备10μm长高比表面积的TiO2纳米管

10μm Long High Surface Ratio TiO2 Nano-tube Prepared by Anodic Oxidation

摘要:

为制备更长的TiO2纳米管,在 0.5(wt)％NaF＋甘油溶液中,20V直流电压下,分别在0℃,20℃和40℃的温度下对Ti片进行阳极氧化7h。SEM结果表明：得到的TiO₂纳米管长度分别为1.034μm、2.601μm和5.152μm；pH值测试结果表明：温度升高,溶液扩散系数增大,试样附近H+扩散加快,试样附近pH值减少速度慢.在40℃的0.5(wt)％NaF＋甘油溶液中对Ti片进行阳极氧化12h,TiO₂纳米管长度超过了10μm。

关键词:TiO2纳米管;阳极氧化;0.5(wt)％NaF＋甘油溶液;pH值测试;比表面积

Abstract:

In order to prepare longer TiO2 nano-tube, Ti sheet was anodic oxidized under direct voltage of 20V in solution of 0.5(wt)％NaF＋glycerin for 7h, in the temperature of 0℃,20℃ and 40℃ respectively. The results of SEM show that the length of the TiO2 nano-tube are 1.034μm,2.601μm and 5.152μm for 0℃,20℃ and 40℃ respectively. The results of pH test show that diffusion coefficient of solution increases with temperature increasing, diffusion of H+ speed up near the Ti sheet, so the rate of pH reduction slow down. In the temperature of 40℃, in solution of 0.5(wt)％NaF＋glycerin, TiO2 nano-tube can grow to about 10μm for 12h, and surface ratio achieves 208 m2.g-1.

Key words:TiO2nano-tube; anodic oxidation; solution of 0.5(wt)％NaF＋glycerin; pH test; surface ratio