Figure 2.

FESEM images of samples (a, b) D, (c, d) E, and (e, f) F. (a), (c), and (e) correspond to top views. (b), (d), and (f) correspond to cross-sectional views. The insets show high-magnification SEM images.

Yu et al. Nanoscale Research Letters 2012 7:517   doi:10.1186/1556-276X-7-517
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