Figure 2.

SEM images of ZnO NWs grown under different times and their cross-section view. (a) and (d) 30 min, (b) and (e) 45 min, and (c) and (f) 60 min.

Yu et al. Nanoscale Research Letters 2012 7:306   doi:10.1186/1556-276X-7-306
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