Figure 2.

AFM images. (a) ZnO. (b) Li-doped ZnO (2 wt.%). (c) Li-doped ZnO (10 wt.%). (d) Li-doped ZnO (30 wt.%).

Kim et al. Nanoscale Research Letters 2014 9:150   doi:10.1186/1556-276X-9-150
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