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(a) High magnification SEM image of a 20° tilted view of a six-fold symmetric nanostructure. (b) Medium magnification SEM image of several six-fold symmetric nanostructures. (c) High magnification SEM image of a two-fold symmetric nanostructure. (d) High magnification SEM image of a four-fold symmetric nanostructure. (e) High magnification SEM image of a tilted view of the nanowalls in the core of these nanostructures.
(a) TEM image of an isolated six-fold symmetric nanostructure oriented in (0001) zone for the nanowalls. (b) Electron diffraction pattern of the nanowalls from Zone (1) in (a). (c) Electron diffraction pattern of the extended overhang from Zone (2) in (a). (d) Intensity profile across the line as indicated in (a). (e) HRTEM image of the boundary region from Zone (3) in (a).
(a) SEM image of an embryo of a six-fold symmetric nanostructure at an earlier stage. (b) SEM image of an embryo of a six-fold symmetric nanostructure with partially well developed nanowalls. (c) Schematic illustration showing the growth mechanism. (d) Selective SEM images corresponding to the growth stages in (c).
(a) CL spectra of a ZnO integrated nanostructures measured at room temperature. (b) SEM image of the integrated nanostructure (c) and (d) Monochromatic CL images of an integrated nanostructure for emission at and , respectively.
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