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Surface properties of nanodiamond films deposited by electrophoresis on Si(100) / E. Maillard-Schaller [et al.] // Diamond and Related Materials. - 1999. - Vol. 8, Is. 2-5. - P805-808 . - ISSN 0925-9635
Кл.слова (ненормированные):
Energy band diagram -- Nanodiamond -- Raman spectroscopy -- Surface characterization -- Band structure -- Electrodeposition -- Electrophoresis -- Hydrogen -- Nanostructured materials -- Nitrogen -- Oxidation -- Oxygen -- Phonons -- Plasma applications -- Silicon wafers -- Surface properties -- Dielectrophoresis -- Negative electron affinity (NEA) -- Phonon confinement effect -- Diamond films
Аннотация: The surface properties of diamond nanoparticles (40-50 A in diameter) have been investigated by X-ray photoelectron spectroscopy (XPS), UV photoelectron spectroscopy (UPS) and Raman spectroscopy. The diamond nanoparticles have been deposited on flat Si(100) substrates by electrophoresis/dielectrophoresis. The as-deposited films are strongly oxidized and present a 1-2% nitrogen content. After treatment at 850 В°C in H2 plasma for 60 min, the oxygen is removed, and the position of the C 1s core-level peak indicates a n-type electronic comportment of the diamond nanoparticles. Raman spectroscopy of the as-deposited film shows a sp3 contribution at 1321 cm-1 and a sp2 contribution around 1620 cm-1. The 12 cm-1 shift of the sp3 contribution with respect to the bulk diamond peak at 1333 cm-1 is attributed to a phonon confinement effect due to the size of the diamond particles. The H2 plasma treatment induces a size decrease of the nanocrystallites confirmed by Raman and scanning electron microscopy (SEM) measurements. UPS spectroscopy shows a negative electron affinity of -0.2 eV of the hydrogenated nanodiamond film.

Scopus
Держатели документа:
Solid State Physics Department, University of Fribourg, 1700, Fribourg, Switzerland
Institute of Christallography, 117333, Moscow, Russian Federation
Institute of Biophysics, 660036, Krasnoyarsk, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Maillard-Schaller, E.; Kuettel, O.M.; Diederich, L.; Schlapbach, L.; Zhirnov, V.V.; Belobrov, P.I.

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Thermal properties of diamond/carbon composites / A. Vlasov [et al.] // Diamond and Related Materials. - 2000. - Vol. 9: 10th European Conference on Diamond, Diamond-like Materials, Carbon Nanotubes, Nitrides and Silicon Carbide (12 September 1999 through 17 September 1999, Prague, Czech Republic, Is. 3-6. - P1104-1109, DOI 10.1016/S0925-9635(99)00256-3 . - ISSN 0925-9635
Кл.слова (ненормированные):
Diamond composites -- Laser flash technique -- TEM -- Thermal conductivity -- Grain size and shape -- Laser applications -- Nanostructured materials -- Phonons -- Thermal conductivity of solids -- Transmission electron microscopy -- Diamond composites -- Laser flash technique -- Industrial diamonds -- carbon -- composite -- diamond -- thermal conductivity
Аннотация: The thermal conductivity, k, of diamond/carbon composites with different ratios of sp 2/sp 3-bonded carbon is measured by the laser flash technique. The thermal conductivity of nanocomposites containing 6 nm diamond particles falls within the range of k=0.003-0.017 W/cmK at room temperature. The thermal conductivity increases while nanopores are gradually filled with pyrolytic carbon (pyrocarbon/diamond mass ratio variation of 0.0-0.5). Transmission electron microscopy data reveal a fairly uniform mixture of two carbon phases, the diamond and matrix having similar grain sizes. Estimates show that the phonon free path is limited by dimensions of carbon matrix layer. Thermal data for coarse-grain (1-2 ?m) composites are also given for comparison. (C) 2000 Elsevier Science S.A. All rights reserved.

Scopus
Держатели документа:
General Physics Institute, 38 Vavilov Str., Moscow 117942, Russian Federation
Ctrl. Res. Institute of Materials, 8 Paradnaya Str., St. Petersburg, Russian Federation
Institute of Crystallography, Leninsky prosp. 59, Moscow, Russian Federation
Institute of Biophysics, Krasnoyarsk 660036, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Vlasov, A.; Ralchenko, V.; Gordeev, S.; Zakharov, D.; Vlasov, I.; Karabutov, A.; Belobrov, P.

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SURFACE PHONONS IN MOLECULAR CRYSTALS. / V. G. Podoprigora [et al.] // Physica Status Solidi (B) Basic Research. - 1987. - Vol. 139, Is. 1. - P109-115 . - ISSN 0370-1972
Кл.слова (ненормированные):
HYDROCARBONS - Surfaces -- PHONONS -- MOLECULAR CRYSTALS -- SURFACE PHONONS -- CRYSTALS
Аннотация: The lattice dynamics of the surface layers of anthracene and beta -paradichlorobenzene crystals as well as of the adsorbed monolayer of paradibromobenzene on beta -paradichlorobenzene is investigated using the method of atom-atom potentials in slab dynamical calculations. The dynamic, structural, and electro-optical parameters of the surface crystal layers are compared with those for the bulk.

Scopus
Держатели документа:
Acad of Sciences of the USSR, Krasnoyarsk, USSR, Acad of Sciences of the USSR, Krasnoyarsk, USSR : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Podoprigora, V.G.; Remizov, I.A.; Shabanov, V.F.; Botvich, A.N.

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PHOTON-PHONON INTERACTION INFLUENCE ON THE EXTERNAL VIBRATION SPECTRA OF MOLECULAR CRYSTALS. / A. N. Botvich [et al.] // Physica Status Solidi (B) Basic Research. - 1986. - Vol. 134, Is. 2. - P515-522 . - ISSN 0370-1972
Кл.слова (ненормированные):
BENZENE -- PHONONS -- PHOTONS -- EXTERNAL VIBRATION SPECTRA -- M-CHLORONITROBENZENE -- MOLECULAR CRYSTALS -- PHOTON-PHONON INTERACTION -- CRYSTALS
Аннотация: A method is developed to determine the parameters of electromagnetic and elastic excitations in molecular crystals including the polariton resonance region. The dependence of eigenvectors and eigenfrequencies on the wavevector of elementary excitations is calculated numerically for m-chloronitrobenzene crystals. The conditions are found when the photon-phonon resonance effect becomes observable in the Raman scattering (RS) spectra of this crystal.

Scopus
Держатели документа:
Acad of Sciences of the USSR, Krasnoyarsk, USSR, Acad of Sciences of the USSR, Krasnoyarsk, USSR : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Botvich, A.N.; Shabanov, V.F.; Vtyurin, A.N.; Pozdnyakova, T.A.

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