EN
We have reported the fabrication of MgO core/SnO_2 shell nanowires, by a two-step evaporation process. Thermal annealing induced changes in morphology, in which the nanowire surface became rough by the agglomeration of SnO_2 shell layers and its crystallinity was enhanced. It was found that three fundamental modes (475, 634, 772 cm^{-1}) and an infrared (IR)-active mode (682 cm^{-1}) of rutile SnO_2 appeared in the Raman spectrum of MgO core/SnO_2 shell nanowires. By thermal annealing, the relative intensity of the A_{2u} to the A_{1g} line was reduced, presumably due to the disorder or size effects.