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Cross-sectional high-resolution transmission electron microscopy study of the structures of carbon nanotubes
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In this article, the structures of carbon nanotubes are investigated by cross-sectional high-resolution transmission electron microscopy, and it is shown that polygonal rather than circular or spherical geometries predominate.Abstract:
The structures of carbon nanotubes are investigated by cross-sectional high-resolution transmission electron microscopy. Some results for longitudinal sections are also included. No examples of perfect seamless tubes or of “scroll-type” Archimedean spirals are found; in each case examined, papier m[acaron]he-like aggregates of graphene sheets occur, each of finite extent. There is a strong tendency for the structures to relax, locally at least, towards the three-dimensional structure of graphite. Thus polygonal rather than circular or spherical geometries predominate. Some comments are offered concerning a realistic model for the structures, as well as for understanding the electronic properties of multilayer carbon nanotubules. It is proposed that our specimens grew in an atmosphere rich in single graphene sheets, rather than C60 cages.read more
Citations
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Major grass pollen allergen Lol p 1 binds to diesel exhaust particles: implications for asthma and air pollution.
Robert Bruce Knox,Cenk Suphioglu,Philip E. Taylor,R. Desai,H. C. Watson,J. L. Peng,L. A. Bursill +6 more
TL;DR: This data indicates that the presence of grass pollen allergens in the atmosphere is associated with epidemics of thunderstorm asthma during the grass pollen season and the question arises whether these particles can interact with other sources of fine particles, particularly those present during episodes of air pollution.
Journal ArticleDOI
Carbon nanotubes and their emission properties
TL;DR: In this paper, the interconnection between structural peculiarities and electronic characteristics of carbon nanotubes has been studied and the development of these methods offers the possibility of mass production and application of relevant devices.
Journal ArticleDOI
Sorption properties of carbon nanostructures
TL;DR: The current status of research in carbon nanotubes (CNTs) is reviewed in this article, where the structural peculiarities of CNTs, determining their sorption characteristics, are considered.
Journal ArticleDOI
Metal nanoparticles for the catalytic synthesis of carbon nanotubes
TL;DR: In this paper, the various mechanisms proposed for nanotube nucleation and growth from such particles have been reviewed and the micro/nanostructure of the materials obtained by the different methods have also been addressed.
Journal ArticleDOI
Synthesis of carbon nanotube–Fe-Al2O3 nanocomposite powders by selective reduction of different Al1.8Fe0.2O3 solid solutions
TL;DR: In this paper, the authors used a combination of chemical analysis, X-ray diffraction, Mossbauer spectroscopy, scanning and transmission electron microscopy, thermogravimetric analysis and specific surface area measurements.
References
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Journal ArticleDOI
Helical microtubules of graphitic carbon
TL;DR: Iijima et al. as mentioned in this paper reported the preparation of a new type of finite carbon structure consisting of needle-like tubes, which were produced using an arc-discharge evaporation method similar to that used for fullerene synthesis.
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Single-shell carbon nanotubes of 1-nm diameter
Sumio Iijima,Toshinari Ichihashi +1 more
TL;DR: In this article, the authors reported the synthesis of abundant single-shell tubes with diameters of about one nanometre, whereas the multi-shell nanotubes are formed on the carbon cathode.
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Cobalt-catalysed growth of carbon nanotubes with single-atomic-layer walls
TL;DR: In this paper, it was shown that covaporizing carbon and cobalt in an arc generator leads to the formation of carbon nanotubes which all have very small diameters (about 1.2 nm) and walls only a single atomic layer thick.
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New one-dimensional conductors: Graphitic microtubules.
TL;DR: It is predicted that carbon microtubules exhibit striking variations in electronic transport, from metallic to semiconducting with narrow and moderate band gaps, depending on the diameter of the tubule and on the degree of helical arrangement of the carbon hexagons.
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Are fullerene tubules metallic
TL;DR: It is estimated that the mean-field transition temperature from a Peierls-distorted regime to a high-temperature metallic regime should be well below room temperature.