Abstract
We have investigated the structural change of catalysts of iron-coated indium–tin–oxide films during the chemical vapor deposition (CVD) of carbon tubule nanocoils by in situ measurement of X-ray diffraction. It was found that heating the catalysts to a CVD temperature of 700°C in He atmosphere induces the oxidation of iron and forms nanoparticles with a diameter of several tens of nanometers, containing nanocrystals of indium oxide and iron oxide. At the initial stage of CVD using acetylene, the catalyst particles start to be deoxidized and then absorb carbon atoms to form crystalline iron–indium–tin–carbide compounds. The carbon nanocoils are grown from these compounds.
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