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Lenka Zajíčková, Marek Eliáš, Ondřej Jašek, Zuzana Kučerová, Petr Synek, Jiřina Matějková, Magdaléna Kadlečíková, Mariana Klementová, Jiří Buršík, Anna Vojačková

Characterization of Carbon Nanotubes Deposited in Microwave Torch at Atmospheric Pressure

Plasma Processes and Polymers 4 (2007) S245–S249

Carbon nanotubes (CNTs) were prepared in microwave plasma torch at atmospheric pressure on the Si/SiO2 substrates with iron catalytic layer from the mixture of CH4/H2/Ar. The pretreatment phase for production of Fe nanoparticles was an integral part of the deposition. It took only few seconds and the substrate temperature reached 1020–1170 K. The stable temperature of the deposition was 870–950K. Due to a spatial non-uniformity of the discharge the prepared samples exhibited several different regions of CNTs. A blackish transition region closed to iron margins contained thin CNTs with the average diameter below 18 nm and much larger Fe particles. The most of the black deposit was a continuous film of straight standing CNTs with average diameter of 38 nm. The approximately same sized iron particles were found at nanotube tips. HRTEM showed a presence of triple-walled nanotubes with outer diameter below 5 nm. Raman spectra in the low frequency region consisted of several weak peaks assigned to RBM of thin MWNTs whereas first-order Raman peaks in the high frequency region were attributed to D, G and D' bands.

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You can also contact one of the authors: lenkaz@physics.muni.cz, mareke@physics.muni.cz, jasek@physics.muni.cz, synek@physics.muni.cz

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