Figure 6.

SEM images of the synthesized ZnO samples. With different reaction times: (a) 10, (b) 60, (c) 120, and (d) 180 min. The reaction concentration was 0.25 M.

Hou et al. Nanoscale Research Letters 2012 7:507   doi:10.1186/1556-276X-7-507
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