Figure 3.

SEM images of the synthesized ZnO samples. With different reactant concentrations: (a) 0.01, (b) 0.03, (c) 0.1, and (d) 0.5 M. The reaction time was 180 min.

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