Abstract
Behaviors of carbon nanotubes (CNTs) in H2 atmosphere or CH4+H2 mixtures, transforming mechanism of CNTs to diamond embryo were investigated. Experimental results show that CNTs could be etched by H2 and transformed to carbon nanoparticles under conditions of hot-filament chemical vapor deposition. The mechanism can be concluded that CNTs were broken down by H2, transformed to carbon nanoparticles or shorter CNTs; on surface of carbon nanoparticles or end caps of CNTs diamond crystals were nucleated and grown up.
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