Effect of precursor concentration on the growth of zinc oxide nanorod arrays on pre-treated substrates |
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Authors: | ZN Urgessa OS Oluwafemi JR Botha |
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Institution: | 1. Department of Physics, P.O. Box 77000, Nelson Mandela Metropolitan University, Port Elizabeth 6031, South Africa;2. Department of Chemistry and Chemical Technology, Walter Sisulu University, Mthatha Campus, Private Bag XI, 5117, South Africa |
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Abstract: | Well aligned zinc oxide nanorod arrays (ZNAs) synthesized by a simple chemical bath deposition method were fabricated on pre-treated Si substrates. By keeping the molar VI/II ratio constant, the effect of precursor concentration on the growth and optical quality of the ZNAs was investigated. The as-synthesized ZNAs were characterized by field emission scanning electron microscopy (FESEM), x-ray diffraction (XRD) and photoluminescence spectroscopy (PL). FESEM images show that both the diameter and aspect ratio of the ZNAs increase dramatically as the precursor concentration increases. The XRD analysis indicates that all the as-grown ZNAs are crystalline and are preferentially oriented along the c-axis. The high intensity ratio of the UV emission to visible emission in the room temperature PL spectra illustrate that high optical quality ZNAs were produced. |
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Keywords: | ZnO Nanorod arrays Si substrate Chemical bath deposition |
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