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Electron spectroscopy of nanodiamond surface states / P. I. Belobrov [et al.] // Applied Surface Science. - 2003. - Vol. 215, Is. 1-4 SPEC. - P169-177, DOI 10.1016/S0169-4332(03)00287-3 . - ISSN 0169-4332
Кл.слова (ненормированные):
Auger electron spectroscopy -- Nanodiamond -- PEELS -- Surface states -- XPS -- Auger electron spectroscopy -- Diamonds -- Electrons -- Hydrogen -- Nanostructured materials -- Surfaces -- X ray photoelectron spectroscopy -- Nanodiamond (ND) surface states -- Surface phenomena
Аннотация: Electronic states of nanodiamond (ND) were investigated by PEELS, XPS and CKVV Auger spectra. Parallel electron energy loss spectra (PEELS) show that the electrons inside of ND particles are sp3 hybridized but there is a surface layer containing distinct hybridized states. The CKVV Auger spectra imply that the HOMO of the ND surface has a shift of 2.5eV from natural diamond levels of ?p up to the Fermi level. Hydrogen (H) treatment of natural diamond surface produces a chemical state indistinguishable from that of ND surfaces using CKVV. The ND electronic structure forms ?s1?p2?1 surface states without overlapping of ?-levels. Surface electronic states, including surface plasmons, as well as phonon-related electronic states of the ND surface are also interesting and may also be important for field emission mechanisms from the nanostructured diamond surface. В© 2003 Elsevier Science B.V. All rights reserved.

Scopus
Держатели документа:
Molecular Architecture Group, Institute of Biophysics SB RAS, UNESCO Dept. Krasnoyarsk Stt. T.U., Krasnoyarsk 660036, Russian Federation
School of Physics, University of Melbourne, Parkville, Vic. 3010, Australia
RRC Kurchatov Institute, Moscow 123182, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Belobrov, P.I.; Bursill, L.A.; Maslakov, K.I.; Dementjev, A.P.

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Surface bonding states of nano-crystalline diamond balls / J. L. Peng [et al.] // International Journal of Modern Physics B. - 2001. - Vol. 15, Is. 31. - P4071-4085, DOI 10.1142/S0217979201007865 . - ISSN 0217-9792
Кл.слова (ненормированные):
diamond -- article -- crystal structure -- electron -- energy transfer -- nanoparticle -- particulate matter -- structure analysis -- surface property -- transmission electron microscopy
Аннотация: The rough surface of nano-crystalline diamond spheres induces surface electronic states which appear as a broadened pre-peak over approx. 15 eV at the C K-edge energy threshold for carbon in the parallel electron energy loss spectrum (PEELS). This appears to be at least partially due to 1s-?* transitions, although typically the latter occupy a range of only 4 eV for the sp2 edge of highly-oriented pyrollytic graphite (HOPG). No ?* electrons appear in the conduction band inside the diamond particles, where all electrons are sp3 hybridized. PEELS data were also obtained from a chemical vapour deposited diamond film (CVDF) and gem-quality diamond for comparison with the spectra of nano-diamonds. The density of Sp2 and Sp3 states on the surface of diamond nano-crystals is calculated for simple structural models of the diamond balls, including some conjecture about surface structures. The results are used to interpret the sp2/sp3 ratios measured from the PEELS spectra recorded as scans across the particles. Surface roughness at the atomic scale was also examined using high-resolution transmission electron microscopy (HRTEM) and electron nano-diffraction patterns were used to confirm the crystal structures.

Scopus
Держатели документа:
Department of Applied Physics, RMIT University, Swanston Street, Melbourne, Vic. 3051, Australia
Electron Microscope Unit, University of Sydney, NSW 2006, Australia
Molecular Architecture Group, Kirensky Institute of Physics, Institute of Biophysics, 660036 Krasnoyarsk, Russian Federation
School of Physics, University of Melbourne, Parkville, Vic. 3010, Australia : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Peng, J.L.; Bulcock, S.; Belobrov, P.I.; Bursill, L.A.

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Low-field electron emission of diamond/pyrocarbon composites / A. V. Karabutov [et al.] // Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures. - 2001. - Vol. 19: 13th International Vaccum Microelectronics Conference (14 August 2000 through 17 August 2000, Guangzhou, Is. 3. - P965-970, DOI 10.1116/1.1368669 . - ISSN 1071-1023
Кл.слова (ненормированные):
Carbon nanotubes -- Chemical bonds -- Chemical vapor deposition -- Composite materials -- Diamond films -- Electric conductivity -- Electron emission -- Electron energy levels -- Hysteresis -- Interfaces (materials) -- Raman scattering -- Semiconducting diamonds -- Semiconductor quantum wells -- Transmission electron microscopy -- X ray diffraction analysis -- X ray photoelectron spectroscopy -- Pyrocarbon composites -- Nanostructured materials
Аннотация: The properties of field electron emission for diamond/pyrocarbon nanocomposites produced from diamond particles surrounded by a pyrocarbon matrix were studied. Low-threshold emissions at fields of ?1 V/?m with no activation or hysterisis in the current versus voltage (I/V) behaviour were observed for the materials. Scanning tunneling-field emission microscopy was used to study the mechanisms of low-field electron emission from the composites, and a model based on quantum well effect at the diamond/graphite interface was proposed and discussed.

Scopus
Держатели документа:
General Physics Institute, Vavilova str. 38, Moscow 117942, Russian Federation
Central Research Institute of Materials, Paradnaya str. 8, St. Petersburg 191014, Russian Federation
Institute of Biophysics, Krasnoyarsk 660036, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Karabutov, A.V.; Frolov, V.D.; Konov, V.I.; Ralchenko, V.G.; Gordeev, S.K.; 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 bonding states of nano-crystalline diamond balls [Text] / J. L. Peng [et al.] // Int. J. Mod. Phys. B. - 2001. - Vol. 15, Is. 31. - P. 4071-4085, DOI 10.1142/S0217979201007865. - Cited References: 20 . - ISSN 0217-9792

РУБ Physics, Applied + Physics, Condensed Matter + Physics, Mathematical
Рубрики:
PLASMON RESPONSE
   POWDER
   SPECTROSCOPY
   MICROSCOPY
   SILICON
   SI(111)
Аннотация: The rough surface of nano-crystalline diamond spheres induces surface electronic states which appear as a broadened pre-peak over approx. 15 eV at the C K-edge energy threshold for carbon in the parallel electron energy loss spectrum (PEELS). This appears to be at least partially due to 1s-pi* transitions, although typically the latter occupy a range of only 4 eV for the sp(2) edge of highly-oriented pyrollytic graphite (HOPG). No pi* electrons appear in the conduction band inside the diamond particles, where all electrons are sp(3) hybridized. PEELS data were also obtained from a chemical vapour deposited diamond film (CVDF) and gem-quality diamond for comparison with the spectra of nano-diamonds. The density of sp(2) and sp(3) states on the surface of diamond nano-crystals is calculated for simple structural models of the diamond balls, including some conjecture about surface structures. The results are used to interpret the sp(2)/sp(3) ratios measured from the PEELS spectra recorded as scans across the particles. Surface roughness at the atomic scale was also examined using high-resolution transmission electron microscopy (HRTEM) and electron nano-diffraction patterns were used to confirm the crystal structures.

WOS
Держатели документа:
RMIT Univ, Dept Appl Phys, Melbourne, Vic 3051, Australia
Univ Sydney, Electron Microscope Unit, Sydney, NSW 2006, Australia
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Mol Architecture Grp, Krasnoyarsk 660036, Russia
Russian Acad Sci, Siberian Branch, Inst Biophys, Krasnoyarsk 660036, Russia
Univ Melbourne, Sch Phys, Parkville, Vic 3052, Australia
ИФ СО РАН
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Peng, J.L.; Bulcock, S...; Belobrov, P.I.; Bursill, L.A.

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Paramagnetic properties of nanodiamond [Text] / P. I. Belobrov [et al.] // Dokl. Phys. - 2001. - Vol. 46, Is. 7. - P. 459-462, DOI 10.1134/1.1390396. - Cited References: 15 . - ISSN 1028-3358

РУБ Mechanics + Physics, Multidisciplinary
Рубрики:
DIAMONDS

WOS
Держатели документа:
Russian Acad Sci, Inst Biophys, Siberian Div, Krasnoyarsk 660036, Russia
Cent Res Inst Mat, St Petersburg 191014, Russia
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
ИБФ СО РАН : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Belobrov, P.I.; Gordeev, S.K.; Petrakovskaya, E.A.; Falaleev, O.V.

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Single-Crystal Diamond Needle Fabrication Using Hot-Filament Chemical Vapor Deposition / R. Ismagilov, S. Malykhin, A. Puzyr [et al.] // Materials. - 2021. - Vol. 14, Is. 9. - Ст. 2320, DOI 10.3390/ma14092320. - Cited References:32. - This work was supported by the Russian Science Foundation (project no. 19-79-00203) and by the Russian Foundation for Basic Research (grant no. 18-29-19071, in part for PL and Raman inspection). . - ISSN 1996-1944

РУБ Chemistry, Physical + Materials Science, Multidisciplinary + Metallurgy &

Кл.слова (ненормированные):
thin films -- diamond needles -- chemical vapor deposition -- hot-filament -- CVD -- large-scale synthesis
Аннотация: Single-crystal diamonds in the form of micrometer-scale pyramids were produced using a combination of hot-filament (HF) chemical vapor deposition (CVD) and thermal oxidation processes. The diamond pyramids were compared here with similar ones that were manufactured using plasma-enhanced (PE) CVD. The similarities revealed in the morphology, Raman, and photoluminescent characteristics of the needles obtained using the hot-filament and plasma-enhanced CVD are discussed in connection with the diamond film growth mechanism. This work demonstrated that the HF CVD method has convincing potential for the fabrication of single-crystal diamond needles in the form of regularly shaped pyramids on a large surface area, even on non-conducting substrates. The experimental results demonstrated the ability for the mass production of the single-crystal needle-like diamonds, which is important for their practical application.

WOS
Держатели документа:
Moscow MV Lomonosov State Univ, Dept Phys, Moscow 119991, Russia.
Univ Eastern Finland, Dept Phys & Math, Joensuu 80101, Finland.
Russian Acad Sci, Lebedev Phys Inst, Div Solid State Phys, Moscow 119991, Russia.
Russian Acad Sci, RAS, Inst Biophys, Fed Res Ctr,Krasnoyarsk Sci Ctr SB, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Ismagilov, Rinat; Malykhin, Sergei; Puzyr, Aleksey; Loginov, Artem; Kleshch, Victor; Obraztsov, Alexander; Russian Science FoundationRussian Science Foundation (RSF) [19-79-00203]; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-29-19071]

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