Abstract
Dendritic ZnMgO nanostructures were synthesized on Si(111) substrates by a catalyst-free thermal evaporation method using Zn and Mg powder as the source materials. The structural, compositional and optical properties were investigated by field emission scanning electron microscopy, x-ray diffraction, transmission electron microscopy, Raman scattering and photoluminescence. The results indicate that the incorporated Mg in the as-grown nanostructures mainly form a separated cubic MgO phase. By annealing in oxygen, hexagonal ZnMgO can be formed with the dendritic nanostructures maintained, which exhibits a blueshift of ∼0.05 eV in the near band edge emission. It is possible to tune the Mg content in the nanostructures simply by varying the distance between the substrate and the source materials.
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