Figure 1.

(8,0) ZnO nanotube. (a) Ag atom doped at 1 site and N atoms which can be doped at 2, 3, 4, 5, and 6 sites. (b) Top view of (8,0) ZnO nanotube. Red and gray balls represent O and Zn atoms, respectively.

Feng et al. Nanoscale Research Letters 2013 8:365   doi:10.1186/1556-276X-8-365
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