Morphology alterations during postsynthesis oxidation of Zn nanowires

摘要

Zinc metal nanowires have been oxidized at temperatures of 200-500 ℃ in ambient air in order to obtain ZnO nanowires. X-ray diffraction investigations reveal a complete transformation from Zn to ZnO at a temperature of ≥300 ℃ within 30 min. Temperature-induced grain growth attains saturation at about 350 ℃. Scanning electron microscopy studies show a pronounced morphology change from smooth, unidirectional to rough, bursted nanorods at a temperature of ＞250 ℃. The corresponding transformation mechanism is discussed.