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ABSTRACT: The presence of hexagonal boron nitride in the initial C:BN:Ni:Y 2 O 3 mixture in the arc-discharge process leads to the modification of carbon nanostructures and to the creation of B x C y N z entities. BN-incorporation into these carbon nanostructures (single-wall nano-tubes and carbon flakes) has been analyzed by high resolution transmission electron micros-copy and electron energy loss spectroscopy. The optical absorption spectroscopy measurements have revealed a monotonous increase of the bandgap value of the synthe-sized nanotubes with the increase of the content of BN phase in the initial mixture of the syn-thesis compounds. Furthermore, a narrowing of the nanotube diameter distribution in favor of small diameters takes place in the presence of BN during the synthesis process.
Carbon 01/2012; 50:791-799. · 5.38 Impact Factor
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T Susi,
Z Zhu,
G Ruiz-Soria,
R Arenal,
P Ayala,
A G Nasibulin,
H Lin,
H Jiang, O Stephan,
T Pichler,
A Loiseau,
E I Kauppinen
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ABSTRACT: Great effort has been directed into modifying the electrical properties of produced carbon nanotubes by chemical doping and - in parallel - into controlling their chirality. We present a new approach to synthesizing nitrogen-doped single-walled carbon nanotubes (SWCNTs), based on gas phase floating catalyst CVD. The nitrogen content in the tubes was verified by transmission electron microscopy/electron-energy loss spectroscopy (TEM/EELS), and their chiral angle distribution found by electron diffraction (ED) to be skewed toward armchair tubes. Additionally, the optical properties of the material were probed by multi-frequency Raman spectroscopy and optical absorption. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Physica Status Solidi B-basic Solid State Physics. 12/2010; 247(11-12):2726-2729.
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T Susi,
Z Zhu,
G Ruiz-Soria,
R Arenal,
P Ayala,
A G Nasibulin,
H Lin,
H Jiang, O Stephan,
T Pichler,
A Loiseau,
E I Kauppinen
physica status solidi (b). 247(11-12):2726-2729.
