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(b)
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Figure 3: AFM images of Cu nanostructures: (a) typical medium scale AFM image (0.9 × 0.9 μm), (b) topographical map of the SDS capped Cu NPs, (c) typical medium scale AFM image (0.9 × 0.9 μm), and (d) topographical map of the CTAB capped Cu NRds.