Abstract
CuO nanowires have been synthesized by thermal oxidation of copper foils in oxygen atmosphere. Morphology and microstructure of the nanowires was studied as a function of temperature and annealing time using scanning electron microscopy, energy dispersive X-ray analysis, X-ray diffractogram, X-ray photoelectron spectroscopy, transmission electron microscopy and selected area electron diffraction. Nanowires were found to grow preferentially along [0 1 0] direction. Length of nanowires was seen to increase with annealing time and for long times branched structure was observed. A “blue-shift” in comparison to bulk CuO was observed in the band gap as determined from optical absorption spectra. Mechanism of growth of CuO nanowires is discussed.
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