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(a) TEM image of a porous silicon film showing a fresh surface (zone 1) and a contiguous irradiated area (zone 2). (b) Gives the schematic of the structural details of an active site.
A sequence of four TEM images summarizes the growth process of a nanotree. In the first image, the arrows points to two actives sites from where the trees started to grow. The total time elapsed between the first and the last image was . Starting at the tip of the active site a subnanometer trunk starts to grow and increases in thickness as the multibranching process takes place in a hierarchical manner.
TEM image of a single nanotree in which up to six sequential branching steps can be observed.
TEM image of overirradiated trees shows the morphological modifications of the branches in which coalescence made the upper branches to be reduced in size and increased in thickness.
(a) TEM image of a collection of trees grown along the modified porous silicon surface. (b) Shows the TEM image of a highly dense region of trees. The comparison between both “nanoforests” shows that branching is affected by the close proximity of the trees.
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