Authors : Dinh Thi Thanh Tam, Tran Thi Ngoc Quyen, Thi Hanh Thu Vu and Long Giang Bach
Abstract: In this study, visible light active Zinc Oxide Nanorod arrays (ZnO NRs) were successfully prepared by an electrochemical process using Al-doped ZnO film (AZO) as an electrode, followed by annealed in ambient at difference temperature (100-500°C). The as-prepared ZnO NRs were characterized by SEM, XRD and PL technique. From the XRD and SEM results, ZnO NRs possess hexagonal morphology with an average diameter of 50-60 nm and the average length of 1.2-1.3 μm was obtained. From PL spectrum, the annealed temperature significant effects on the surface defects in ZnO NRs which can be enhanced visible light absorption. Moreover, ZnO NRs sample annealed at 300°C exhibited the highest PL peak, having the highest formation rate of COH radicals and the highest percentage of Methylene Blue (MB) removal (76.05%) under visible light irradiation. This result indicates that the formation rate of •OH radicals shows a good correlation with the photocatalytic activity.
Dinh Thi Thanh Tam, Tran Thi Ngoc Quyen, Thi Hanh Thu Vu and Long Giang Bach, 2019. Growth ZnO Nanorod Arrays and its Photocatalytic Activity Under Visible Light Irradiation. Journal of Engineering and Applied Sciences, 14: 7437-7441.