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Materials 2016, 9(4), 300; doi:10.3390/ma9040300

Temperature-Driven Structural and Morphological Evolution of Zinc Oxide Nano-Coalesced Microstructures and Its Defect-Related Photoluminescence Properties

1
Materials Science Program, School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Selangor Darul Ehsan 43600, Malaysia
2
Technical Support Division, Malaysian Nuclear Agency, Kajang 43000, Malaysia
3
Low Dimensional Materials Research Centre, Department of Physics, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia
These authors contributed equally to this work.
*
Authors to whom correspondence should be addressed.
Academic Editor: Jung Ho Je
Received: 4 January 2016 / Revised: 19 March 2016 / Accepted: 15 April 2016 / Published: 20 April 2016
(This article belongs to the Section Structure Analysis and Characterization)
View Full-Text   |   Download PDF [4992 KB, uploaded 20 April 2016]   |  

Abstract

In this paper, we address the synthesis of nano-coalesced microstructured zinc oxide thin films via a simple thermal evaporation process. The role of synthesis temperature on the structural, morphological, and optical properties of the prepared zinc oxide samples was deeply investigated. The obtained photoluminescence and X-ray photoelectron spectroscopy outcomes will be used to discuss the surface structure defects of the prepared samples. The results indicated that the prepared samples are polycrystalline in nature, and the sample prepared at 700 °C revealed a tremendously c-axis oriented zinc oxide. The temperature-driven morphological evolution of the zinc oxide nano-coalesced microstructures was perceived, resulting in transformation of quasi-mountain chain-like to pyramidal textured zinc oxide with increasing the synthesis temperature. The results also impart that the sample prepared at 500 °C shows a higher percentage of the zinc interstitial and oxygen vacancies. Furthermore, the intensity of the photoluminescence emission in the ultraviolet region was enhanced as the heating temperature increased from 500 °C to 700 °C. Lastly, the growth mechanism of the zinc oxide nano-coalesced microstructures is discussed according to the reaction conditions. View Full-Text
Keywords: zinc oxide; thin films; vapor deposition; photoluminescence spectrofluorometer; X-ray photoelectron spectroscopy; surface structure defects zinc oxide; thin films; vapor deposition; photoluminescence spectrofluorometer; X-ray photoelectron spectroscopy; surface structure defects
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lim, K.; Abdul Hamid, M.A.; Shamsudin, R.; Al-Hardan, N.; Mansor, I.; Chiu, W. Temperature-Driven Structural and Morphological Evolution of Zinc Oxide Nano-Coalesced Microstructures and Its Defect-Related Photoluminescence Properties. Materials 2016, 9, 300.

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