| 1. |
- Popok, Vladimir, 1966, et al.
(author)
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Stopping of energetic argon cluster ions in graphite: Role of cluster momentum and charge
- 2010
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In: PHYSICAL REVIEW B. - 1098-0121. ; 82:20
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Journal article (peer-reviewed)abstract
- We show that the implantation depth for argon clusters in graphite scales linearly with cluster momentum. A plot of implantation depth versus the momentum scaled with the projected surface area of the cluster falls on the same universal plot as that shown for semiconductor and metallic clusters, thus providing a universal scaling law for cluster implantation. Molecular dynamics simulations provide some insight to the mechanisms behind the empirical observation.
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| 2. |
- Rehammar, Robert, 1980, et al.
(author)
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Optical properties of carbon nanofiber photonic crystals
- 2010
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In: NANOTECHNOLOGY. - : Institute of Physics; 1999. - 0957-4484 .- 1361-6528. ; 21:46, s. 465203-
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Journal article (peer-reviewed)abstract
- Carbon nanofibers (CNFs) are used as components of planar photonic crystals. Square and rectangular lattices and random patterns of vertically aligned CNFs were fabricated and their properties studied using ellipsometry. We show that detailed information such as symmetry directions and the band structure of these novel materials can be extracted from considerations of the polarization state in the specular beam. The refractive index of the individual nanofibers was found to be n(CNF) = 4.1.
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| 3. |
- Schiessling, Joachim, et al.
(author)
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Synchrotron radiation study of the electronic structure of multiwalled carbon nanotubes
- 2003
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In: Journal of Physics. - : IOP Publishing. - 0953-8984 .- 1361-648X. ; 15:38, s. 6563-
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Journal article (peer-reviewed)abstract
- We present photoelectron (PE) and x-ray absorption spectra (XAS) of macroscopically aligned multiwalled carbon nanotubes. We identify the peaks in the valence PE spectra with regions of high density of states through comparison to calculations for graphite. Finally, we outline and illustrate a simple method for using XAS to determine the average alignment of a nanotube sample.
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| 4. |
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| 5. |
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| 6. |
- Sveningsson, M., et al.
(author)
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Raman spectroscopy and field-emission properties of CVD-grown carbon-nanotube films
- 2001
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In: Applied Physics a-Materials Science & Processing. ; 73, s. 409-418
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Journal article (peer-reviewed)abstract
- Carbon-nanotube films are very efficient cathodes for field-emission devices. This study presents a comprehensive comparison between structural, spectroscopic and field-emission properties of films of aligned and non-aligned multi-wall nanotubes (MWNTs) which are grown by thermal chemical vapour deposition. Three types of films are investigated: vertically aligned MWNTs with clean and coated nanotube side walls as well as non-aligned MWNT films. Raman spectra taken on the aligned MWNT films consist of many lines of first-, second- and third-order signals. Several lines are reported here far the first time for MWNTs. The presence of the surface coating leads to a decrease and broadening of the higher-order signals as well as an increase in the disorder-induced contributions in the first-order regime. The aligned MWNT films have excellent field-emission properties with very high emission current densities and low turn-on and threshold fields. The presence of a surface coating has no impact on the efficiency of the field-emission process. Films of non-aligned MWNTs show considerably reduced electron-emission current densities and larger critical fields.
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