Zeng Huipeng, Li Chengyuan, Dan Yuxin, Lu Yishan, Sun Weidong, Zhang Shaoyu, Song Ye
Key Laboratory of Soft Chemistry and Functional Materials of Education Ministry, NanJing University of Science and Technology, Nanjing 210094, People's Republic of China.
Jiangsu Urban and Rural Construction College, Changzhou 213147, People's Republic of China.
Nanotechnology. 2022 Nov 28;34(6). doi: 10.1088/1361-6528/ac3788.
Two-step anodization has been widely used because it can produce highly self-organized anodic TiOnanotubes, 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 TiOnanotubes 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.
两步阳极氧化法已被广泛应用，因为它可以制备出高度自组织的阳极TiO纳米管，但一步阳极氧化法和两步阳极氧化法在形貌和电流-时间曲线上的差异鲜有报道。在此，分别在不同电压下进行一步阳极氧化法和两步阳极氧化法。通过比较一步阳极氧化法和两步阳极氧化法制备的阳极TiO纳米管的场发射扫描电子显微镜（FESEM）图像，发现形貌特征的变化与电压有关。分析了相同电压下一步阳极氧化法和两步阳极氧化法在形貌和电流-时间曲线上的差异：两步阳极氧化法的纳米管平均生长速率和孔隙率均大于一步阳极氧化法。在电流-时间曲线中，两步阳极氧化法中I阶段和II阶段的持续时间明显短于一步阳极氧化法。传统的场辅助溶解理论无法解释在相同氟化物电解液中不同电压下电流-时间曲线的三个阶段及其物理意义。在此，通过离子电流、电子电流和氧气泡模型理论成功阐明了一步阳极氧化法和两步阳极氧化法之间的差异。
