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Polyyne-containing carbons are transformed to multi-wall carbon nanotubes (CNTs) in a transmission electron microscope. This technique has an advantage to observe the CNT growth in an in-situ way, and the CNTs have been found to grow in a two-step process: quick formation (a few seconds) of rod-like carbons, and slow formation (1 min) of the hollows inside the rods accompanied by graphitization of...
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