Low-temperature synthesis of amorphous carbon nanocoils via acetylene coupling on copper nanocrystal surfaces at 468 K: a reaction mechanism analysis.

摘要: A new type of amorphous helical carbon nanofibers has been synthesized using copper nanocatalysts and an acetylene gas source at atmospheric pressure. The are grown 468 K, which is the lowest temperature by ordinary metal-catalyzed thermal chemical vapor deposition hydrocarbon, exhibit a symmetric growth mode in form twin helices. IR, XRD, Raman, C/H molar ratio analyses reveal polymer-like structure with weak trans-polyacetylene feature. mixture solid polymers small amount carbon. reaction mechanism proposed on basis previous studies adsorption, desorption properties, surface reactions (111), (110), (001) planes under ultrahigh-vacuum (UHV) conditions as well results obtained our study. single-crystal surfaces UHV indeed reflects practical catalytic pressure....