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| - Large-Scale Synthesis of Aligned Carbon NanotubesUsing FeCl3 as Floating Catalyst Precursor
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| - Arrays of well-aligned multiwall carbon nanotubes (MWCNTs) are grown by pyrolysis of an iron(III) chloride/toluene solution and by chemical vapor deposition. The nanotubes usually show a straight up to conical graphitic sheet structure with the iron catalyst particles at the top end. In the higher temperature regime, iron carbide is formed as proven by the evaluation of high-resolution transmission electron microscope images.
- The continuous interest in carbon nanotubes (CNTs) and nanotube arrays has led us todiscover new routes of high-yield and low-cost synthesis of CNTs with controlled tubestructure. Here we show that a dilute solution of FeCl3 in toluene and N,N-dimethylaminoacetate is a high-efficiency floating catalyst precursor in a chemical vapor deposition process.The growth structure and the self-assembling behavior of the resulting multiwall tubes wascharacterized using scanning and transmission electron microscopy. Clear indications areprovided of the participation of iron carbide in the tube formation at higher temperatures.The characteristic cone-shaped morphology of the tubes is described in detail and discussedin terms of its interesting practical implications.
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