Journal of Nanomaterials / 2015 / Article / Fig 2

Research Article

Synthesis of Monodisperse Walnut-Like SnO2 Spheres and Their Photocatalytic Performances

Figure 2

SEM images of the samples obtained with various KOH concentrations for 15 h: (a) 2 M, (b) 3 M, (c) 4 M, and (d) 4 M at high magnification.
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