| 1. |
- Leis, J, et al.
(author)
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Carbon nanostructures produced by chlorinating aluminium carbide
- 2001
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In: Carbon. - 0008-6223 .- 1873-3891. ; 39:13, s. 2043-2048
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Journal article (peer-reviewed)abstract
- A number of carbon samples with different nanostructures such as: amorphous, nanoparticles and turbostratic, were synthesised through the reaction between aluminium carbide and gaseous chlorine at fixed temperatures between 300 and 900 degreesC. The synthesised carbon samples were characterised using high-resolution transmission electron microscopy and X-ray powder diffraction techniques, as well as low temperature nitrogen sorption measurements. The carbon produced at T=300 degreesC was amorphous with a surface area of similar to 1400 m(2) g(-1). At 700 degreesC, a large amount of carbon nanoparticles and with a lower surface area similar to 710 m(2) g(-1) was obtained. At 900 degreesC, mainly a turbostratic carbon with a surface area of similar to 680 m(2) g(-1) was produced.
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| 2. |
- Leis, J, et al.
(author)
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Catalytic effects of metals of the iron subgroup on the chlorination of titanium carbide to form nanostructural carbon
- 2002
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In: Carbon. - 0008-6223 .- 1873-3891. ; 40:9, s. 1559-1564
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Journal article (peer-reviewed)abstract
- The effect of the reaction temperature and the metals of an iron subgroup on the thermo-chemical treatment of titanium carbide with a chlorine gas and their influence on the carbon structure obtained thereby was studied. Different analytical methods such as porosity measure me tits, X-ray diffraction spectrometry and a high-resolution electron microscopy revealed the catalytic behaviour of the above-mentioned metals. which appeared to support the formation of graphitised carbon at much lower temperatures compared to those needed for the ordinary thermo-chemical chlorination of titanium carbide.
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| 3. |
- Makarova, Tatiana L, et al.
(author)
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Electrical properties of two-dimensional fullerene matrices
- 2001
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In: Carbon. - : Elsevier B.V.. - 0008-6223 .- 1873-3891. ; 39:14, s. 2203-2209
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Journal article (peer-reviewed)abstract
- The electrical properties of two-dimensionally polymerized C60 fullerenes were studied. Fullerene matrices consisting of randomly oriented domains are compared to the highly-oriented rhombohedral phase. The conductivity of the randomly oriented polymers obeys the Arrhenius law and can be described in a multiple trapping model. The oriented phase of polymeric C60 shows a distinct anisotropy in the electrical properties with a metallic-like in-plane conductivity at high temperatures.
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| 4. |
- Makarova, Tatiana L, et al.
(author)
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Magnetism in photopolymerized fullerenes
- 2003
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In: Carbon. - Amsterdam : Elsevier B.V.. - 0008-6223 .- 1873-3891. ; 41:8, s. 1575-1584
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Journal article (peer-reviewed)abstract
- The phototransformation of bulk C-60 and laser- and electron-beam treatment of C-60 films in air changes their magnetic properties. Nonlinear magnetization is observed only for samples irradiated in the presence of oxygen, while, in the case of pressure-polymerized C-60, oxygen adversely affects the magnetic properties. The contrasting roles of oxygen in these processes are discussed. Magnetic force microscopy shows that laser- and electron-beam irradiation of fullerene films produces magnetic images which are highly correlated with the topographic images.
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| 5. |
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| 6. |
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| 7. |
- Neidhardt, Jörg, et al.
(author)
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Correlated high resolution transmission electron microscopy and X-ray photoelectron spectroscopy studies of structured CNx (0 < x < 0.25) thin solid films
- 2004
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In: Carbon. - : Elsevier BV. - 0008-6223 .- 1873-3891. ; 42:Dec-13, s. 2729-2734
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Journal article (peer-reviewed)abstract
- Structured carbon nitride (CNx), thin solid films, also known as fullerene-like, consist of, upon nitrogen substitution, bent and cross-linked graphene planes. They were synthesized by unbalanced reactive magnetron sputtering and analyzed by high-resolution transmission electron microscopy (HRTEM) in combination with X-ray photoelectron spectroscopy (XPS). The microstructure evolution in terms of plane alignment, extension and cross-linking can be controlled by adjusting the synthesis conditions, such as growth temperature, N-2 fraction in the discharge gas and ion energy. HRTEM on plan-view samples was used to examine the structural changes depending on growth temperature and N-2 fraction. The problem of projection artifacts for imaging the structural features was partially overcome by selected area electron diffraction analysis, where it is shown that diffraction corresponding to 3.5 Angstrom is associated with the formation of structured CNx. The incorporation of N is crucial for the evolution of heavily bent and frequently cross-linked basal planes, since it triggers pentagon formation and cross-linking at much lower energies compared to pure carbon films. Therefore, the two spectral features in the nitrogen Is core electron spectra as examined by XPS were correlated to the microstructure evolution. (C) 2004 Elsevier Ltd. All rights reserved.
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| 8. |
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| 9. |
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| 10. |
- Longtin, R, et al.
(author)
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Micromechanical testing of carbon fibers deposited by low-pressure laser-assisted chemical vapor deposition
- 2004
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In: Carbon. - : Elsevier BV. - 0008-6223. ; 42:14, s. 2905-2913
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Journal article (peer-reviewed)abstract
- Carbon fibers were deposited directly from ethylene by laser-assisted chemical vapor deposition. The precursor gas pressures and the incident laser powers were varied. Micro-mechanical testing was carried out using a high-precision micro-manipulator. During three-point bend testing the fibers showed an elastic response, with no residual strain upon unloading, until fracture. The fibers’ strength and Young’s modulus are reported. A model for fiber fracture is proposed based on fiber cross-section analysis. Scanning electron microscopy was used to study the fiber cross-sections and the fiber surface morphology. The mechanical properties are related to the characteristic fiber microstructure investigated by Raman spectroscopy
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