Figure 1.

SEM images of Al nanoparticle and NiO nanowire composites before (a) and after (b, c) sonication. Scale bar 100 nm in (a), 2 μm in (b), and 100 nm in (c).

Wen et al. Nanoscale Research Letters 2013 8:184   doi:10.1186/1556-276X-8-184
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