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FESEM images of (a) top view and (b) cross-sectional image of ZnO nanorod array grown in argon ambient at . The inset shows a high magnification of the ZnO nanorods and the scale bar is .
(Color online) XRD patterns of ZnO and nanostructures grown on silicon substrates.
(Color online) (a) TEM image of core-shell structure, (b) selected area diffraction pattern of core-shell nanorods, and (c) EDS cross-sectional line scan of a nanorod, highlighting the distribution profiles of Zn (◻) and Er (▵) across the core-shell nanorod.
(Color online) Photoluminescence spectra of the ZnO nanorods array and core-shell nanostructures.
(Color online) Schematic band diagram of core-shell nanostructure.
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