Long  Giang Bach, Dinh  Thi Thanh Tam, Tran  Thi Ngoc Quyen, Thi  Hanh Thu Vu, 
    Growth ZnO Nanorod Arrays and its Photocatalytic Activity
Under Visible Light Irradiation,
    Journal of Engineering and Applied Sciences,
    Volume 14,Issue 20,
    2019,
    Pages 7437-7441,
    ISSN 1816-949x,
    jeasci.2019.7437.7441,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2019.7437.7441)
    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.
    Keywords: ZnO nanorod arrays;photocatalysis;methylene blue;formation;hexagonal morphology;highest
percentage