Figure 2.

SEM images of individual ZnO microcrystal, magnification image of tapered nanowire, and the oxidation process. SEM images of an individual ZnO microcrystal (a) before and (b) after oxidation at 500°C. (c) The magnification image of the tapered nanowire. (d) Illustration images of the metallic Zn transformed into ZnO microcavity during the oxidation process.

Lu et al. Nanoscale Research Letters 2014 9:178   doi:10.1186/1556-276X-9-178
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