A comparative study of two-step anodization with one-step anodization at constant voltage. (5th February 2023)

• Record Type: Journal Article
• Authors: Zeng, Huipeng; Li, Chengyuan; Dan, Yuxin; Lu, Yishan; Sun, Weidong; Zhang, Shaoyu; Song, Ye
• Is Part Of: Nanotechnology. Volume 34:Number 6(2023)
• Publication Date: 2023-02-05
• Subjects: anodization -- current-time curve -- electronic current -- ionic current -- formation mechanism; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/ac3788
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: Two-step anodization has been widely used because it can produce highly self-organized anodic TiO2 nanotubes, but the differences in morphology and current-time curve of one-step anodization and two-step anodization are rarely reported. Here, one-step anodization and two-step anodization were conducted at different voltages. By comparing the FESEM image of anodic TiO2 nanotubes fabricated by one-step anodization and two-step anodization, it was found that the variation of morphology characteristics is same with voltage. The distinction of morphology and current-time curve between one-step anodization and two-step anodization at the same voltage were analyzed: the nanotube average growth rate and porosity of two-step anodization are greater than that of one-step anodization. In the current-time curve, the duration of stage I and stage II in two-step anodization are significantly shorter than one-step anodization. The traditional field-assisted dissolution theory cannot explain the three stages of the current-time curves and their physics meaning under different voltages in the same fluoride electrolyte. Here, the distinction between one-step anodization and two-step anodization was clarified successfully by the theories of ionic current and electronic current and oxygen bubble mould.