Abstract

Fe(C) nanocapsules were prepared by the chemical vapor condensation(CVC) process using the pyrolysis of iron pentacarbonyl (Fe(CO)_5). Their characterizations were studied by means of X-ray diffraction, X-ray photoelectron spectrometer and transmission electron microscopy. The long-chained Fe(C) nanocapsules hav-ing the mean size of under 70 nm could be obtained below 1100°C in different gas flow rates. The particle size of the powders was increased with increasing decomposition temperature, but it was decreased with increasing CO gas flow rate. The Fe powders produced at 500°C consisted of three layers of alpha-Fe/Fe_3C/amorphous phases, but it had two phase core-shell structure which consited of Fe_3C phase of core and graphite of shell at 1100°C.

• Keywords: Chemical vapor condensation;Iron pentacarbonyl;Nanocapsule;