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. 2016 Mar 3;6:22524. doi: 10.1038/srep22524

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(A) The length of the supported NWs shown grows visibly as the total condensed irradiation (red circle) increases. (B) After 30 seconds of condensed irradiation the precursor appears considerably compact. Nevertheless, areas of lighter contrast can already be seen near the edges. (C) After 210 seconds of condensed irradiation the precursor is extensively eroded indicating a substantial part of its material has been lost due to the action of the condensed beam. A dense matt of NWs extends all through the precursor forming an urchin-like structure.