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. 2016 Dec 14;6:38515. doi: 10.1038/srep38515

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(a) Photography of a CNT array on HR-Si sample. SEM cross-section images of the CNT arrays with different growth time: (b) 1.5 min, (c) 3.0 min, (d) 5.0 min, (e) 7.0 min, (f) 10.0 min.