Structure and electrical conductivity of nitrogen-doped carbon nanofibers

Ismagilov, Z. R.; Shalagina, A.E.; Podyacheva, O. Yu.; Ischenko, A.V.; Kibis, Lidiya S.; Boronin, A. I.; Chesalov, Yu. A.; Kochubey, D.I.; Романенко, А. И.; Аникеева, О. Б.; Buryakov, T. I.; Ткачев, Е. Н.

doi:10.1016/j.carbon.2009.02.034

Cited by 339 publications

(198 citation statements)

References 40 publications

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“…Moreover, the slope of the temperature dependence curves changes with functionalization of the surface which is attributed to the changes in the mechanism of electrical conductivity. Untreated nanotubes possess logarithmic temperature dependence corresponding to two-dimensional quantum corrections to conductivity (see [18] for details), and brominated MWNTs show exponential temperature dependence of conductivity which can be described within theory of Coulomb blockade or quasi one-dimensional variable range hopping conductivity with variable length of hops between localized states one-dimensional hopping conductivity or Coulomb gap conductivity [19]. Such changes occur due to changes of current carries density on the Fermi level due to interaction with bromine.…”

Section: Resultsmentioning

confidence: 99%

Direct Vapor-Phase Bromination of Multiwall Carbon Nanotubes

Мазов

Krasnikov

Stadnichenko

et al. 2012

Journal of Nanotechnology

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We present the simple procedure of the vapor-phase bromination of multiwall carbon nanotubes (MWNTs) at moderate temperatures. MWNTs with average diameter 9 ± 3 nm were treated with Br 2 vapors at 250• C to produce Br-functionalized product. Transmission electron microscopy analysis was used to prove low damage of MWNT walls during bromination. X-ray photoelectron spectroscopy (XPS) and differential thermal analysis (DTA) were used to investigate chemical composition of the surface of initial and brominated nanotubes. The experimental results show that the structure of MWNTs is not affected by the bromination process and the total amount of Br-containing surface functions reaches 2.5 wt. %. Electrophysical properties of initial and brominated MWNTs were investigated showing decrease of conductivity for functionalized sample. Possible mechanism of the vapor-phase bromination via surface defects and oxygen-containing functional groups was proposed according to data obtained. Additional experiments with bromination of annealed low-defected MWNTs were performed giving Br content a low as 0.75 wt. % proving this hypothesis.

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Section: Resultsmentioning

confidence: 99%

Direct Vapor-Phase Bromination of Multiwall Carbon Nanotubes

Мазов

Krasnikov

Stadnichenko

et al. 2012

Journal of Nanotechnology

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“…Введение азота в углеродную структуру не изменяет морфологии волокон, и при этом сохраняется структура УНВ. Вместе с тем, увели-чивается дефектность поверхности и изменяются физические свойства нановолокон [16][17]. Так, проводимость модифицированных азотом УНВ уменьшается до 2 См/см по сравнению с исход-ными УНВ (2,8 См/см) вследствие увеличения структурных дефектов, о чем свидетельствуют данные спектроскопии комбинационного рассея-ния (рис.…”

Section: модифицирование полимерно-жидко-кристаллических композитов уunclassified

Optical Methods of Forming Highly Structured Polymer-Liquid Crystal Composites

Zharkova¹,

Podyacheva²,

Streltsov³

2015

Liq. Cryst. and their Appl.

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“…On the other hand, the electrical and optical properties of carbon nanostructures are largely dependent on their structures (Kataura et al, 1999;Yang et al, 2003). The conducting properties of CNFs that can be varied from metal to semiconductor (depending on the structural parameters and doping with heteroatoms) are very important for practical applications (Ismagilov, 2009). All CNFs products obtained by CCVD method contain impurities such as metal catalyst particles, amorphous carbon and carbon nanoparticles depending on the reaction conditions.…”

Section: Wwwintechopencommentioning

confidence: 99%