Are Boron-Doped Carbon Nanotubes Metallic?

Yokomichi, Haruo; Matoba, Masaaki; Fukuhara, Tadashi; Sakima, Hiroyuki; Sakai, Fuminori; Maezawa, K.

doi:10.1002/(sici)1521-3951(199805)207:1<r1::aid-pssb99991>3.0.co;2-d

Cited by 8 publications

(6 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For pure (8,0) we find the Fermi energy 6.028 eV with band gap at Γ point (most symmetric point in the BZ) as 0.48 eV. However, alloying with boron atoms in (8,0) nanotubes such as in BC 3 system, the Fermi energy reduces to 4.256 eV.…”

Section: Study Of Band Structure Of B 3 C and Bcmentioning

confidence: 99%

See 1 more Smart Citation

A Comparative Study of Optical Anisotropies of BC₃ and B₃C Systems by Density Functional Theory

Jana

Chen

et al. 2011

ISRN Nanotechnology

View full text Add to dashboard Cite

The optical properties of (8,0) BC 3 and B 3 C single-wall carbon nanotubes (SWCNTs) are computed using ab initio density functional theory (DFT). The electronic band structure reveals that the Fermi energy of B 3 C system is reduced compared to BC 3 . The static dielectric constant in the long wavelength limit for B 3 C system is 9 times larger than that of BC 3 in unpolarized electromagnetic field. Within 10 eV frequency (energy) range, the absorption coefficient of B 3 C is higher compared to BC 3 , while, above 10 eV, it is less than that of BC 3 . In parallel polarization, the peak of the loss function for B 3 C is shifted to higher frequency (energy) region with significantly six orders of magnitude compared to BC 3 system. The analysis of this study indicates that the optical anisotropies can be gained easily in these boron-doped systems by appropriately choosing the direction of the polarization of the electromagnetic field. Besides, the results of the loss functions may throw some light on the nature of collective excitations of these two systems.

show abstract

Section: Study Of Band Structure Of B 3 C and Bcmentioning

confidence: 99%

“…The electronic properties of single-wall carbon nanotubes (SWCNTs) can be tailored [7,8] by substituting carbon atom(s) by heteroatom (s) such as boron or nitrogen. It is well known that pure CNTs are unable to detect highly toxic gases, water molecules, and biomolecules [9].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study of Optical Anisotropies of BC₃ and B₃C Systems by Density Functional Theory

Jana

Chen

et al. 2011

ISRN Nanotechnology

View full text Add to dashboard Cite

show abstract

“…The doping of carbon nanotubes (CNTs) with boron [ 1 – 2 ], nitrogen [ 3 – 4 ] or phosphorus [ 5 ] atoms has been frequently used to enhance or tune their physicochemical properties. Among the elemental dopants, nitrogen emerges as of particular interest in electronics since N-CNTs should be characterized by a higher electrical conductivity (n-doping).…”

Section: Introductionmentioning

confidence: 99%

En route to controlled catalytic CVD synthesis of densely packed and vertically aligned nitrogen-doped carbon nanotube arrays

Boncel¹,

Pattinson²,

Geiser³

et al. 2014

Beilstein J. Nanotechnol.

View full text Add to dashboard Cite

SummaryThe catalytic chemical vapour deposition (c-CVD) technique was applied in the synthesis of vertically aligned arrays of nitrogen-doped carbon nanotubes (N-CNTs). A mixture of toluene (main carbon source), pyrazine (1,4-diazine, nitrogen source) and ferrocene (catalyst precursor) was used as the injection feedstock. To optimize conditions for growing the most dense and aligned N-CNT arrays, we investigated the influence of key parameters, i.e., growth temperature (660, 760 and 860 °C), composition of the feedstock and time of growth, on morphology and properties of N-CNTs. The presence of nitrogen species in the hot zone of the quartz reactor decreased the growth rate of N-CNTs down to about one twentieth compared to the growth rate of multi-wall CNTs (MWCNTs). As revealed by electron microscopy studies (SEM, TEM), the individual N-CNTs (half as thick as MWCNTs) grown under the optimal conditions were characterized by a superior straightness of the outer walls, which translated into a high alignment of dense nanotube arrays, i.e., 5 × 108 nanotubes per mm2 (100 times more than for MWCNTs grown in the absence of nitrogen precursor). In turn, the internal crystallographic order of the N-CNTs was found to be of a ‘bamboo’-like or ‘membrane’-like (multi-compartmental structure) morphology. The nitrogen content in the nanotube products, which ranged from 0.0 to 3.0 wt %, was controlled through the concentration of pyrazine in the feedstock. Moreover, as revealed by Raman/FT-IR spectroscopy, the incorporation of nitrogen atoms into the nanotube walls was found to be proportional to the number of deviations from the sp2-hybridisation of graphene C-atoms. As studied by XRD, the temperature and the [pyrazine]/[ferrocene] ratio in the feedstock affected the composition of the catalyst particles, and hence changed the growth mechanism of individual N-CNTs into a ‘mixed base-and-tip’ (primarily of the base-type) type as compared to the purely ‘base’-type for undoped MWCNTs.

show abstract

“…Carbon nanotubes (CNTs) because of to their unique one-dimensional structure and unusual physical, chemical and mechanical properties have attracted the attention of theoretical and experimental research groups [1,2]. The electronic properties of single wall carbon nanotubes (SWCNTs) can be tailored [3,4] by substituting carbon atom(s) by heteroatoms (s) such as boron or nitrogen. It is well known that pure CNTs are unable to detect highly toxic gases, water molecules and biomolecules [5].…”

Section: Introductionmentioning

confidence: 99%

A first principles study of the optical properties of BxCy single wall nanotubes

Jana

Chen

et al. 2007

Carbon

View full text Add to dashboard Cite

Are Boron-Doped Carbon Nanotubes Metallic?

Cited by 8 publications

References 4 publications

A Comparative Study of Optical Anisotropies of BC₃ and B₃C Systems by Density Functional Theory

A Comparative Study of Optical Anisotropies of BC₃ and B₃C Systems by Density Functional Theory

En route to controlled catalytic CVD synthesis of densely packed and vertically aligned nitrogen-doped carbon nanotube arrays

A first principles study of the optical properties of BxCy single wall nanotubes

Contact Info

Product

Resources

About

Are Boron-Doped Carbon Nanotubes Metallic?

Cited by 8 publications

References 4 publications

A Comparative Study of Optical Anisotropies of BC3 and B3C Systems by Density Functional Theory

A Comparative Study of Optical Anisotropies of BC3 and B3C Systems by Density Functional Theory

En route to controlled catalytic CVD synthesis of densely packed and vertically aligned nitrogen-doped carbon nanotube arrays

A first principles study of the optical properties of BxCy single wall nanotubes

Contact Info

Product

Resources

About

A Comparative Study of Optical Anisotropies of BC₃ and B₃C Systems by Density Functional Theory

A Comparative Study of Optical Anisotropies of BC₃ and B₃C Systems by Density Functional Theory