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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belobrov P.I., Bursill L.A., Maslakov K.I., Dementjev A.P.
Заглавие : Electron spectroscopy of nanodiamond surface states
Место публикации : Applied Surface Science. - 2003. - Vol. 215, Is. 1-4 SPEC. - С. 169-177. - ISSN 01694332 (ISSN) , DOI 10.1016/S0169-4332(03)00287-3
Ключевые слова (''Своб.индексиров.''): 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.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Peng J.L., Bulcock S., Belobrov P.I., Bursill L.A.
Заглавие : Surface bonding states of nano-crystalline diamond balls
Место публикации : International Journal of Modern Physics B. - 2001. - Vol. 15, Is. 31. - С. 4071-4085. - ISSN 02179792 (ISSN) , DOI 10.1142/S0217979201007865
Ключевые слова (''Своб.индексиров.''): 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.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Karabutov A.V., Frolov V.D., Konov V.I., Ralchenko V.G., Gordeev S.K., Belobrov P.I.
Заглавие : Low-field electron emission of diamond/pyrocarbon composites
Место публикации : 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. - С. 965-970. - ISSN 10711023 (ISSN) , DOI 10.1116/1.1368669
Ключевые слова (''Своб.индексиров.''): 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.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Puzyr' A.P., Bondar' V.S., Belobrov P.I., Bukaemskii A.A.
Заглавие : Preparation of complexes nanodiamond-protein-delta-aluminum oxide.
Место публикации : Doklady Biochemistry. - 2000. - Vol. 373, Is. 1-6. - С. 139-141. - ISSN 00124958 (ISSN)
Ключевые слова (''Своб.индексиров.''): aluminum oxide--cytochrome c--diamond--article--chemistry--electron microscopy--metabolism--spectroscopy--synthesis--aluminum oxide--cytochrome c group--diamond--microscopy, electron--spectrum analysis
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Maillard-Schaller E., Kuettel O.M., Diederich L., Schlapbach L., Zhirnov V.V., Belobrov P.I.
Заглавие : Surface properties of nanodiamond films deposited by electrophoresis on Si(100)
Место публикации : Diamond and Related Materials. - 1999. - Vol. 8, Is. 2-5. - С. 805-808. - ISSN 09259635 (ISSN)
Ключевые слова (''Своб.индексиров.''): 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.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vlasov A., Ralchenko V., Gordeev S., Zakharov D., Vlasov I., Karabutov A., Belobrov P.
Заглавие : Thermal properties of diamond/carbon composites
Место публикации : 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. - С. 1104-1109. - ISSN 09259635 (ISSN) , DOI 10.1016/S0925-9635(99)00256-3
Ключевые слова (''Своб.индексиров.''): 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.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bondar V.S., Purtov K.V., Puzyr A.P., Baron A.V., Gitel'zon I.I.
Заглавие : Catalytic activity of nanodiamond particles in organic reactions
Место публикации : Doklady Biochemistry and Biophysics. - 2008. - Vol. 418, Is. 1. - С. 11-13. - ISSN 16076729 (ISSN) , DOI 10.1007/s10628-008-1003-7
Ключевые слова (''Своб.индексиров.''): diamond--nanoparticle--organic compound--article--catalysis--chemistry--ultraviolet spectrophotometry--catalysis--diamond--nanoparticles--organic chemicals--spectrophotometry, ultraviolet
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bondar V.S., Ronzhin N.O., Mamaeva E.S., Baron A.V., Gitelson J.I.
Заглавие : Reusable biochemical diagnosis systems based on nanodiamonds
Место публикации : Doklady Biochemistry and Biophysics. - 2013. - Vol. 448, Is. 1. - С. 55-58. - ISSN 16076729 (ISSN) , DOI 10.1134/S160767291301016X
Ключевые слова (''Своб.индексиров.''): cholesterol--diamond--nanoparticle--article--bioassay--blood--chemical model--chemistry--glucose blood level--human--methodology--biological assay--blood glucose--cholesterol--diamond--humans--models, chemical--nanoparticles
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zhirnov V.V., Kuttel O.M., Groning O..., Alimova A.N., Detkov P.Y., Belobrov P.I., Maillard-Schaller E..., Schlapbach L...
Заглавие : Characterization of field emission cathodes with different forms of diamond coatings
Место публикации : J. Vac. Sci. Technol. B: AMER INST PHYSICS, 1999. - Vol. 17: 11th International Vacuum Microelectronics Conference (IVMC 98) (JUL 19-23, 1998, ASHEVILLE, NORTH CAROLINA), Is. 2. - С. 666-669. - 4. - ISSN 1071-1023, DOI 10.1116/1.590614
Примечания : Cited References: 9
Предметные рубрики: TIPS
SILICON
GROWTH
ARRAYS
FILMS
Аннотация: The emission of different, diamond coatings on silicon field emitter. arrays were investigated: chemical vapor deposition diamond, high pressure and high temperature synthetic diamond, and shock-synthesized nanodiamond. Practical emission characteristics such as: emission threshold, maximum current, current stability, and reproducibility were tested. The effects of surface modification, the size of diamond crystallites, and hydrogen plasma treatments were also studied. (C) 1999 American Vacuum Society. [S0734-211X(99)06102-8].
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Purtov K.V., Burakova L.P., Puzyr A.P., Bondar V.S.
Заглавие : The interaction of linear and ring forms of DNA molecules with nanodiamonds synthesized by detonation
Колич.характеристики :3 с
Место публикации : Nanotechnology: IOP PUBLISHING LTD, 2008. - Vol. 19, Is. 32. - Ст.325101. - ISSN 0957-4484, DOI 10.1088/0957-4484/19/32/325101
Примечания : Cited References: 13
Предметные рубрики: DIAMOND
NANOPARTICLES
Аннотация: Nanodiamonds synthesized by detonation have been found not to immobilize the ring form of pUC19 plasmid DNA. Linear pUC19 molecules with blunt ends, prepared by restriction of the initial ring form of pUC19 DNA, and linear 0.25-10 kb DNA fragments are adsorbed on nanodiamonds. The amount of adsorbed linear DNA molecules depends on the size of the molecules and the size of the nanodiamond clusters.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Puzyr A.P., Baron A.V., Purtov K.V., Bortnikov E.V., Skobelev N.N., Moginaya O.A., Bondar V.S.
Заглавие : Nanodiamonds with novel properties: A biological study
Колич.характеристики :5 с
Место публикации : Diam. Relat. Mat.: ELSEVIER SCIENCE SA, 2007. - Vol. 16: Joint International Conference on Nanocarbon and Nanodiamond 2006 (SEP 11-15, 2006, St Petersburg, RUSSIA), Is. 12. - С. 2124-2128. - ISSN 0925-9635, DOI 10.1016/j.diamond.2007.07.025
Примечания : Cited References: 25
Предметные рубрики: DIAMOND-LIKE CARBON
EXPERIMENTS IN-VITRO
HUMAN BLOOD-CELLS
DETONATION NANODIAMONDS
DESTRUCTION
CULTURE
Ключевые слова (''Своб.индексиров.''): nanodiamond--nanotechnology--biology--biochemistry
Аннотация: This paper discusses the prospects for using modified detonation nanodiamonds with novel properties as a new promising material for the development of nanotechnologies intended for biological and medical purposes. The authors report that nanodiamonds synthesized by detonation can be used to further purify commercial protein preparations and that enzymes adsorbed on diamond nanoparticles retain their activity. The paper presents results of in vivo experiments with nanodiamonds administered to animals via different routes. (c) 2007 Elsevier B.V. All rights reserved.
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12.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Puzyr A.P., Bondar V.S., Bukayemsky A.A., Selyutin G.E., Kargin V.F.
Заглавие : Physical and chemical properties of modified nanodiamonds
Колич.характеристики :10 с
Место публикации : Synthesis, Properties and Applications of Ultrananocrystalline Diamond. Ser. NATO SCIENCE SERIES, SERIES II: MATHEMATICS, PHYSICS AND CHEMISTRY: SPRINGER, 2005. - Vol. 192: NATO Advanced Research Workshop on Synthesis, Properties and Applications of Ultrananocrystalline Diamond (JUN 07-10, 2004, St Petersburg, RUSSIA). - С. 261-270. - ISBN 1-4020-3320-6
Примечания : Cited References: 15
Ключевые слова (''Своб.индексиров.''): nanodiamond--modified nanodiamonds--hydrosols--colloidal stability--electrophoresis--powder fractioning--precursors for cvd--electron field emission
Аннотация: A unique technology of nanodiamond surface modification is suggested which allows to separation of commercial nanodiamond powders into two fractions (F1 and 172), each possessing absolutely new properties as compared to the initial powder. F1 and F2 differ in size characteristics. Initial and modified nanodiamonds contain iron impurities and two types of nondiamond carbon. The color of the powders and hydrosols does not correlate with the content of non-diamond carbon. According to the EPR data, modified nanodiamonds possess a high level of diamond matrix shielding, and the extracted fractions differ in width of the basic transition area and in the SHF energy adsorption ratio. Due to this, F1 can be applied as precursors for CVD growth of nanocrystalline diamond and as field electron emission tips.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Puzyr A.P., Neshumayev D.A., Tarskikh S.V., Makarskaya G.V., Dolmatov V.Y., Bondar V.S.
Заглавие : Destruction of human blood cells in interaction with detonation nanodiamonds in experiments in vitro
Колич.характеристики :4 с
Место публикации : Diam. Relat. Mat.: ELSEVIER SCIENCE SA, 2004. - Vol. 13: 9th International Conference on New Diamond Science and Technology (MAR 26-29, 2004, Tokyo, JAPAN), Is. 11.12.2013. - С. 2020-2023. - ISSN 0925-9635, DOI 10.1016/j.diamond.2004.06.003
Примечания : Cited References: 10
Ключевые слова (''Своб.индексиров.''): nanodiamonds--white blood cells--erythrocytes--chemiluniscence
Аннотация: In experiments in vitro on human blood, it was shown that nanodianiond (ND) particles change the kinetics of active oxygen generation (AOG), causing white cell destruction and erythrocyte hemolysis. Various mechanisms of the observed effects have been considered. Nanodianionds adapted for biological research and possessing higher colloidal stability make it possible to obtain sterile hydrosols and mixtures with drugs and are more preferable for medical -biological research. We discussed the necessity of experiments in vivo and showed the first results of injection of the adapted nanodianionds to the laboratory animals. (C) 2004 Elsevier B.V. All rights reserved.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikheev G.M., Mikheev K.G., Mogileva T.N., Puzyr A.P., Bondar V.S.
Заглавие : Laser image recording on detonation nanodiamond films
Колич.характеристики :3 с
Коллективы : Russian Foundation for Basic Research [13-02-96016 r_ural_a]; Presidium of the Ural Branch of the Russian Academy of Sciences [12-C-1-1003]
Место публикации : Quantum Electron.: TURPION LTD, 2014. - Vol. 44, Is. 1. - С. 1-3. - ISSN 1063-7818, DOI 10.1070/QE2014v044n01ABEH015299. - ISSN 1468-4799
Примечания : Cited References: 34. - This work was supported by the Russian Foundation for Basic Research (Grant No. 13-02-96016 r_ural_ a) and the Presidium of the Ural Branch of the Russian Academy of Sciences (Project No. 12-C-1-1003).
Предметные рубрики: THERMOCHEMICAL TECHNOLOGY
DIAMOND FILMS
NITROGEN
CARBON
Ключевые слова (''Своб.индексиров.''): detonation nanodiamond--films--laser blackening--raman scattering--luminescence--image recording
Аннотация: A focused He - Ne laser beam is shown to cause local blackening of semitransparent detonation nanodiamond (DND) films at incident power densities above 600 W cm(-2). Data obtained with a Raman spectrometer and low-power 632.8-nm laser source indicate that the blackening is accompanied by a decrease in broadband background luminescence and emergence of sharp Raman peaks corresponding to the structures of nanodiamond and sp(2) carbon. The feasibility of image recording on DND films by a focused He - Ne laser beam is demonstrated.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : CHIGANOVA G.A., BONDAR V.A., CHIGANOV A.S.
Заглавие : ELECTROPHORETIC BEHAVIOR OF HYDROSOLS OF ULTRADISPERSE DIAMOND AND MODIFICATION OF ITS SURFACE
Колич.характеристики :2 с
Место публикации : COLLOID JOURNAL OF THE RUSSIAN ACADEMY OF SCIENCES: PLENUM PUBL CORP, 1993. - Vol. 55, Is. 5. - P774-775. - ISSN 1061-933X
Примечания : Cited References: 5
Аннотация: The method of macro-electrophoresis is used to determine values of the zeta-potential of particles of ultradisperse diamond in solutions of AlCl3. It is shown that an increase in the concentration of aluminum ions to 0.5.10(-4) M leads to a decrease in the negative charge of the diamond particles; the dispersions coagulate in more concentrated solutions of AlCl3. Chemical modification of the surface of ultradisperse diamond by aluminum ions is used to obtain stable hydrosols with positively charged diamond particles.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vlasov A..., Ralchenko V..., Gordeev S..., Zakharov D..., Vlasov I..., Karabutov A..., Belobrov P...
Заглавие : Thermal properties of diamond/carbon composites
Колич.характеристики :6 с
Место публикации : Diam. Relat. Mat.: ELSEVIER SCIENCE SA, 2000. - Vol. 9: 10th European Conference on Diamond, Diamond-Like Materials, Nitrides and Silicon Carbide (Diamond 1999) (SEP 12-17, 1999, PRAGUE, CZECH REPUBLIC), Is. 03.06.2013. - P1104-1109. - ISSN 0925-9635, DOI 10.1016/S0925-9635(99)00256-3
Примечания : Cited References: 9
Предметные рубрики: CVD DIAMOND
CONDUCTIVITY
FILMS
RAMAN
Ключевые слова (''Своб.индексиров.''): diamond composites--laser flash technique--tem--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 mu m) composites are also given for comparison. (C) 2000 Elsevier Science S.A. All rights reserved.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Peng J.L., Bulcock S..., Belobrov P.I., Bursill L.A.
Заглавие : Surface bonding states of nano-crystalline diamond balls
Колич.характеристики :15 с
Место публикации : Int. J. Mod. Phys. B: WORLD SCIENTIFIC PUBL CO PTE LTD, 2001. - Vol. 15, Is. 31. - P4071-4085. - ISSN 0217-9792, DOI 10.1142/S0217979201007865
Примечания : Cited References: 20
Предметные 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.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Karabutov A.V., Frolov V.D., Konov V.I., Ralchenko V.G., Gordeev S.K., Belobrov P.I.
Заглавие : Low-field electron emission of diamond/pyrocarbon composites
Колич.характеристики :6 с
Место публикации : J. Vac. Sci. Technol. B: A V S AMER INST PHYSICS, 2001. - Vol. 19: 13th International Vacuum Microlectronics Conference (AUG 13-17, 2000, GUANGZHOU, PEOPLES R CHINA), Is. 3. - P965-970. - ISSN 1071-1023, DOI 10.1116/1.1368669
Примечания : Cited References: 31
Предметные рубрики: CVD DIAMOND FILMS
SCANNING-TUNNELING-MICROSCOPY
AMORPHOUS-CARBON
COLD-CATHODE
Аннотация: Properties of the field electron emission for diamond/pyrocarbon nanocomposites produced from diamond particles surrounded by an sp(2)-bonded pyrocarbon matrix are considered as functions of a size of diamond particles selected in the range of 5 nm - 5 mum, and of an average thickness of the pyrocarbon shell controlled by the pyrocarbon/diamond mass ratio varied from 0 to 0.5. The low-threshold emission at fields of greater than or equal to1 V/mum with ''no activation/no hysteresis'' I-V behavior was observed for these materials using tungsten tip microprobes as well as a fluorescent screen. A specially designed scanning tunneling-field emission microscope was used for simultaneous mapping of field emission intensity, topography, work function, and electrical resistivity to study the mechanisms of the emission from the composites and well-emitting chemical vapor deposition diamond films. It was found that for both of the materials emission centers are associated with interfaces between diamond and sp2-bonded carbon phases. Possible mechanisms of the low-field electron emission for the diamond/graphite composites including local field enhancement are analyzed. A model of the low-field emission based on quantum well effect at the diamond/graphite interface is proposed and discussed. (C) 2001 American Vacuum Society.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belobrov P.I., Bursill L.A., Maslakov K.I., Dementjev A.P.
Заглавие : Electron spectroscopy of nanodiamond surface states
Колич.характеристики :9 с
Место публикации : Appl. Surf. Sci.: ELSEVIER SCIENCE BV, 2003. - Vol. 215: 4th International Vacuum Electron Sources Conference (JUL 15-19, 2002, SARATOV, RUSSIA), Is. 01.04.2013. - P169-177. - ISSN 0169-4332, DOI 10.1016/S0169-4332(03)00287-3
Примечания : Cited References: 33
Предметные рубрики: AUGER LINE-SHAPES
DIAMOND 111
GRAPHITE
EMISSION
Ключевые слова (''Своб.индексиров.''): nanodiamond--surface states--peels--xps--auger electron spectroscopy
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 sp(3) 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 2.5 eV from natural diamond levels of sigma(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 sigma(s)(1)sigma(p)(2)pi(1) surface states without overlapping of pi-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. (C) 2003 Elsevier Science B.V. All rights reserved.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fedoseeva, Yu. V., Bulusheva L.G., Okotrub A.V., Kanygin M.A., Gorodetskiy D.V., Asanov I.P., Vyalikh D.V., Puzyr A.P., Bondar V.S.
Заглавие : Field emission luminescence of nanodiamonds deposited on the aligned carbon nanotube array
Колич.характеристики :7 с
Коллективы : RFBR grant [13-03-12118], bilateral Program "Russian-German Laboratory at BESSY''
Место публикации : Sci Rep: NATURE PUBLISHING GROUP, 2015. - Vol. 5. - Ст.9379. - ISSN 2045-2322, DOI 10.1038/srep09379
Примечания : Cited References:49. - The work was supported by RFBR grant 13-03-12118 in the part of electroluminescence measurements and the bilateral Program "Russian-German Laboratory at BESSY''. We are grateful to Mr. A.V. Ischenko for the TEM measurements, Mr. S.I. Kozhemyachenko for the Raman spectra, Mrs. N.I. Alferova for the IR spectra, and Mr. D.V. Gulyaev for the photoluminescence spectra.
Предметные рубрики: DETONATION NANODIAMOND
ULTRANANOCRYSTALLINE DIAMOND
Аннотация: Detonation nanodiamonds (NDs) were deposited on the surface of aligned carbon nanotubes (CNTs) by immersing a CNT array in an aqueous suspension of NDs in dimethylsulfoxide (DMSO). The structure and electronic state of the obtained CNT-ND hybrid material were studied using optical and electron microscopy and Infrared, Raman, X-ray photoelectron and near-edge X-ray absorption fine structure spectroscopy. A non-covalent interaction between NDs and CNT and preservation of vertical orientation of CNTs in the hybrid were revealed. We showed that current-voltage characteristics of the CNT-ND cathode are changed depending on the applied field; below similar to 3 V/mu m they are similar to those of the initial CNT array and at the higher field they are close to the ND behavior. Involvement of the NDs in field emission process resulted in blue luminescence of the hybrid surface at an electric field higher than 3.5 V/mu m. Photoluminescence measurements showed that the NDs emit blue-green light, while blue luminescence prevails in the CNT-ND hybrid. The quenching of green luminescence was attributed to a partial removal of oxygen-containing groups from the ND surface as the result of the hybrid synthesis.
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