Abstract
Carbon nanocoils and nanofibers with novel morphologies and potential new properties were prepared from controlled delivery of acetylene. Branched carbon nanocoils were produced from continuous acetylene flow. Pulsed delivery of acetylene produced branched carbon nanofibers with even-length subunits. Interrupted acetylene flow resulted in half coil and half fiber hybrid structures. The substrate was found to play an important role in controlling the morphology of carbon materials. On both silicon substrate and phosphorus-doped alumina ceramic substrates, carbon nanocoils and carbon nanofibers could be selectively prepared; however, on graphite or pure alumina substrate, only straight carbon nanofibers were produced. The ability to control the morphology of the carbon materials provided better insight into the mechanism of the formation of these materials.
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