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Effect of temperature and growth time on vertically aligned ZnO nanorods by simplified hydrothermal technique for photoelectrochemical cells


Citation

Mohd Fudzi, Laimy and Zainal, Zulkarnain and Lim, Hong Ngee and Chang, Sook Keng and Holi, Araa Mebdir and Sarif @ Mohd Ali, Mahanim (2018) Effect of temperature and growth time on vertically aligned ZnO nanorods by simplified hydrothermal technique for photoelectrochemical cells. Materials, 11 (5). art. no. 704. pp. 1-13. ISSN 1996-1944

Abstract

Despite its large band gap, ZnO has wide applicability in many fields ranging from gas sensors to solar cells. ZnO was chosen over other materials because of its large exciton binding energy (60 meV) and its stability to high-energy radiation. In this study, ZnO nanorods were deposited on ITO glass via a simple dip coating followed by a hydrothermal growth. The morphological, structural and compositional characteristics of the prepared films were analyzed using X-ray diffractometry (XRD), field emission scanning electron microscopy (FESEM), and ultraviolet-visible spectroscopy (UV-Vis). Photoelectrochemical conversion efficiencies were evaluated via photocurrent measurements under calibrated halogen lamp illumination. Thin film prepared at 120 °C for 4 h of hydrothermal treatment possessed a hexagonal wurtzite structure with the crystallite size of 19.2 nm. The average diameter of the ZnO nanorods was 37.7 nm and the thickness was found to be 2680.2 nm. According to FESEM images, as the hydrothermal growth temperature increases, the nanorod diameter become smaller. Moreover, the thickness of the nanorods increase with the growth time. Therefore, the sample prepared at 120 °C for 4 h displayed an impressive photoresponse by achieving high current density of 0.1944 mA/cm2.


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Official URL or Download Paper: http://www.mdpi.com/1996-1944/11/5/704

Additional Metadata

Item Type: Article
Divisions: Faculty of Science
Institute of Advanced Technology
DOI Number: https://doi.org/10.3390/ma11050704
Publisher: MDPI
Keywords: Hydrothermal; Dip coating; ZnO; Nanorods; Photoelectrochemical
Depositing User: Nurul Ainie Mokhtar
Date Deposited: 13 Aug 2018 01:35
Last Modified: 13 Aug 2018 01:35
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.3390/ma11050704
URI: http://psasir.upm.edu.my/id/eprint/35366
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