Figure 1.

SEM characterization of various samples. (a) Si micropillar array. (b) Hierarchical architecture of CNTs/Si-μp. (c) Connection between a Si micropillar and CNT forests. (d) CNT forest growing on a planar Si wafer.

He et al. Nanoscale Research Letters 2013 8:412   doi:10.1186/1556-276X-8-412
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