Structural study of nitrogen-doping effects in bamboo-shaped multiwalled carbon nanotubes

Jang, Jae Won; Lee, Cheol Eui; Lyu, Seung Chul; Lee, Tae Jae; Lee, Cheol Jin

doi:10.1063/1.1697624

Cited by 306 publications

(175 citation statements)

References 18 publications

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“…Aza [60]fullerene C 59 N and its dimer are the most studied heterofullerenes 6 . Nitrogen-containing CNTs and graphene exhibit fascinating and unique properties [7][8][9] .…”

mentioning

confidence: 99%

Enantioselective synthesis of a chiral nitrogen-doped buckybowl

et al. 2012

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Bowl-shaped aromatic compounds, namely buckybowls constitute a family of curved polycyclic aromatic carbons along with fullerenes and carbon nanotubes. Doping of heteroatoms to the carbon frameworks of such aromatic compounds drastically modulates their physical and chemical properties. In contrast to nitrogen-doped azafullerenes or carbon nanotubes, synthesis of azabuckybowls, nitrogen-doped buckybowls, remains an unsolved challenging task. Here we report the first enantioselective synthesis of a chiral azabuckybowl, triazasumanene. X-ray crystallographic analysis confirmed that the doping of nitrogen induces a more curved and deeper bowl structure than in all-carbon buckybowls. As a result of the deeper bowl structure, the activation energy for the bowl inversion (thermal flipping of the bowl structure) reaches an extraordinarily high value (42.2 kcal per mol). As the bowl inversion corresponds to the racemization process for chiral buckybowls, this high bowl inversion energy leads to very stable chirality of triazasumanene.

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“…Aza [60]fullerene C 59 N and its dimer are the most studied heterofullerenes 6 . Nitrogen-containing CNTs and graphene exhibit fascinating and unique properties [7][8][9] .…”

mentioning

confidence: 99%

Enantioselective synthesis of a chiral nitrogen-doped buckybowl

et al. 2012

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“…Doping may be implemented by intercalating foreign atoms into the open space in the carbon network [394][395][396] or by substituting the host atoms with impurities. 218,[397][398][399][400][401][402][403][404][405] As for substitutional doping, much attention has recently been given to the doping of nanotubes with boron and nitrogen atoms. This is a natural choice of the dopant, as B and N atoms are the neighbors of C in the Periodic Table and thus have roughly the same atomic radius as C, while they possess one electron less or more than C, respectively.…”

Section: Irradiation-mediated Doping Of Carbon Nanotubes With Foreignmentioning

confidence: 99%

Ion and electron irradiation-induced effects in nanostructured materials

Krasheninnikov¹,

Nordlund²

2010

Journal of Applied Physics

946

591

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A common misconception is that the irradiation of solids with energetic electrons and ions has exclusively detrimental effects on the properties of target materials. In addition to the well-known cases of doping of bulk semiconductors and ion beam nitriding of steels, recent experiments show that irradiation can also have beneficial effects on nanostructured systems. Electron or ion beams may serve as tools to synthesize nanoclusters and nanowires, change their morphology in a controllable manner, and tailor their mechanical, electronic, and even magnetic properties. Harnessing irradiation as a tool for modifying material properties at the nanoscale requires having the full microscopic picture of defect production and annealing in nanotargets. In this article, we review recent progress in the understanding of effects of irradiation on various zero-dimensional and one-dimensional nanoscale systems, such as semiconductor and metal nanoclusters and nanowires, nanotubes, and fullerenes. We also consider the two-dimensional nanosystem graphene due to its similarity with carbon nanotubes. We dwell on both theoretical and experimental results and discuss at length not only the physics behind irradiation effects in nanostructures but also the technical applicability of irradiation for the engineering of nanosystems.

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“…Similar structural variation was observed when N-MWCNTs were grown from mixtures of benzylamine/toluene, 32,34 melamine/ethylene, 24 or ammonia/acetylene. 35 The nitrogen content in the N-MWCNTs was determined from the ratio of the areas under the C 1s and N 1s peaks taking into consideration the photoionization cross-sections for elements at the given photon energy. The values derived from the survey spectra measured at 800 eV are summarised in Table 1.…”

Section: View Article Onlinementioning

confidence: 99%

Controlling pyridinic, pyrrolic, graphitic, and molecular nitrogen in multi-wall carbon nanotubes using precursors with different N/C ratios in aerosol assisted chemical vapor deposition

Bulusheva

Окотруб

Fedoseeva

et al. 2015

Phys. Chem. Chem. Phys.

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Nitrogen-containing multi-wall carbon nanotubes (N-MWCNTs) were synthesized using aerosol assisted chemical vapor deposition (CVD) techniques in conjunction with benzylamine:ferrocene or acetonitrile: ferrocene mixtures. Different amounts of toluene were added to these mixtures in order to change the N/C ratio of the feedstock. X-ray photoelectron and near-edge X-ray absorption fine structure spectroscopy detected pyridinic, pyrrolic, graphitic, and molecular nitrogen forms in the N-MWCNT samples. Analysis of the spectral data indicated that whilst the nature of the nitrogen-containing precursor has little effect on the concentrations of the different forms of nitrogen in N-MWCNTs, the N/C ratio in the feedstock appeared to be the determining factor. When the N/C ratio was lower than ca. 0.01, all four forms existed in equal concentrations, for N/C ratios above 0.01, graphitic and molecular nitrogen were dominant. Furthermore, higher concentrations of pyridinic nitrogen in the outer shells and N 2 molecules in the core of the as-produced N-MWCNTs suggest that the precursors were decomposed into individual atoms, which interacted with the catalyst surface to form CN and NH species or in fact diffused through the bulk of the catalyst particles. These findings are important for a better understanding of possible growth mechanisms for heteroatom-containing carbon nanotubes (CNTs) and therefore paving the way for controlling the spatial distribution of foreign elements in the CNTs using CVD processes.

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Structural study of nitrogen-doping effects in bamboo-shaped multiwalled carbon nanotubes

Cited by 306 publications

References 18 publications

Enantioselective synthesis of a chiral nitrogen-doped buckybowl

Enantioselective synthesis of a chiral nitrogen-doped buckybowl

Ion and electron irradiation-induced effects in nanostructured materials

Controlling pyridinic, pyrrolic, graphitic, and molecular nitrogen in multi-wall carbon nanotubes using precursors with different N/C ratios in aerosol assisted chemical vapor deposition

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