Properties of ZnO Nanorods Arrays Growth via Low Temperature Hydrothermal Reaction

Abstract:

This work describes properties of 1-D ZnO nanorods arrays growth using low temperature hydrothermal method on a seeded substrate. The properties of ZnO seed were studied by varying thermal oxidation temperature from 250-450°C. The formation of ZnO nanorods was studied by varying the growth time during hydrothermal process. The optimum oxidation temperature to produce seeded ZnO template was 400°C. The formation of ZnO nanorods was further studied by varying hydrothermal reaction growth time from 1 to 24 hours. The optimum hydrothermal growth time of 4 hours produced blunt tip-like nanorods with length of ~735 nm and top diameter of ~66 nm. I-V characteristics of ZnO nanorods photodetector in dark, ambient light and UV light were also studied. The change in the photoconductivity under UV illumination was found to be 1 order of magnitude higher compared to dark and ambient light. With an incident wavelength of 370 nm and applied bias of 3V, the responsivity of photodetector was 5.0 mA/W, which was higher compared to other reported works. The increase of photosensitivity indicated that the produced ZnO nanorods were suitable for UV photodetector applications.

• Periodical: Advanced Materials Research (Volume 364)
• Pages: 422-426
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.364.422
• Online since: October 2011
• Authors: Ridhuan Nur Syafinaz, Zainovia Lockman, Azlan Abdul Aziz, Abdul Razak Khairunisak
• Keywords: Hydrothermal, Nanorod, Oxidation, Photodetector (PD), Seeded-Growth, Zinc Oxide (ZnO)

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