The effect of oxygen partial pressure on the growth of ZnO nanostructure on Cu0.62Zn0.38 brass during thermal oxidation |
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Authors: | C.H. Xu Z.B. Zhu H.F. Lui C. Surya S.Q. Shi |
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Affiliation: | 1. School of Materials Science & Engineering, Henan University of Science & Technology, Luoyang, Henan, China;2. Department of Electronic and Information Engineering and Photonics Research Centre, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, China;3. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, China |
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Abstract: | Cu0.62Zn0.38 brass foils were thermally oxidized at 500 °C under various gaseous environments, including nitrogen, air and mixture of N2–O2 at a pressure of 1 atm for 3 h. The oxidized specimens were characterized with a scanning electron microscope, an X-ray diffractometer and a transmission electron microscope. Optical property of oxidized products was characterized by photoluminescence. It is found that the nanowires and/or nanowalls are formed from hexagon ZnO crystals under N2–O2 gases and air. However, nanowires and nanowalls cannot form on the specimens oxidized in N2. When oxygen partial pressure of environment is over a critical value, increasing oxygen partial pressure is of disbenefit to the growth of nanowires and nanowalls and reduces the thickness of oxide scale on a specimen. The experimental results are explained by the defect equilibrium theory of oxide scale and the compressive growth stresses occurred during oxidation. |
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Keywords: | Brass Nanostructures Oxides Oxygen partial pressure Thermal oxidation Photoluminescence |
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