应用电化学阳极氧化方法,在自选的电解液中,通过调节氧化电压和氧化次数制备不同管径的TiO_2纳米管.其管径可分别控制在50, 100和200 nm左右.其中50和100 nm范围的纳米管是一次氧化所制得.通过再次氧化突破了一次氧化对尺寸的限制,所制得纳米管的最大管径达到280 nm.实验证实,在一定的电压范围内,通过调节阳极氧化的电压可以控制TiO_2纳米管的管径大小.但是,在本实验的电解液条件下,在一次氧化过程,通过调节电压制备出的纳米管最大管径只能达到120 nm.采用两次氧化能将TiO_2纳米管的管径扩大到更大的尺寸,可以扩展TiO_2纳米管的应用范围.
Diameters of titania nanotubes could be controlled through changing the oxidation voltages and anodization time. By anodization of one time, the nanotubes with the diameters of 50 nm and 100 nm were fabricated, even of 120 nm for the biggest diameter. By the two-step anodization, however, the diameter of the nanotubes was up to 280 nm, above the limit by one time anodization. It is demonstrated that the increase of voltage in a limited range could increase the diameter of the titana nanotubes, and the diameter of the nanotubes can hardly be expanded beyond 120 nm. In the two-step anodization, the diameter of the nanotubes could be enlarged to a larger range, in which the application of the nanotubes could also be widened.
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