Abstract
We synthesized crystalline MgO nanowires on Au-coated substrates via the thermal evaporation of MgB2 powders. The thickness of the underlying Au layer affected the sample morphology, with onedimensional structures being favored with a thinner Au layer. We have proposed a possible growth mechanism, with respect to the thickness of the predeposited Au layer. X-ray diffraction, selected area electron diffraction, and high resolution transmission electron microscopy all indicated that the obtained nanowires had single-crystal cubic MgO structures. The photoluminescence measurement with a Gaussian fitting exhibited both blue and blue-green light emissions.
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