Carbon nanocells ad nanotubes grown in hydrothermal fluids

摘要

For the first tiem multiwall carbon nanocells( <100 nm) and multiwall carbon nanotubes have been artificially grown in hydrothermal fluids from amorphous carbon,at temperatures below 800degC,in the absence of metal catalysts.Carbon nanocells were the result of bubble growth of graphitic multiwalls at 600degC.Pristine multiwall nanotubes grow at higher teperatures.At 800degC,the condensed solids consist of defect-free sp~2-bonded multiwall nanocrystals.Hot drothermal synthesis of finite sp~2-bonded nanotubes and carbon nanocrystals is possible in moderate conditions and easy to reproduce.