Figure 2.

AFM images (a, b, c, d) of samples A, B, C, and D (5 × 5 μm2). The root mean square roughness of samples B, C, and D are 1.937, 1.815, and 0.416 nm, respectively.

Lv et al. Nanoscale Research Letters 2012 7:617   doi:10.1186/1556-276X-7-617
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