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  1. Article: Single-Crystal Diamond Needle Fabrication Using Hot-Filament Chemical Vapor Deposition.

    Ismagilov, Rinat / Malykhin, Sergei / Puzyr, Aleksey / Loginov, Artem / Kleshch, Victor / Obraztsov, Alexander

    Materials (Basel, Switzerland)

    2021  Volume 14, Issue 9

    Abstract: 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 ... ...

    Abstract 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.
    Language English
    Publishing date 2021-04-29
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma14092320
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Nano-graphite field-emission cathode for space electric propulsion systems.

    Kleshch, Victor I / Ismagilov, Rinat R / Mukhin, Vsevolod V / Orekhov, Anton S / Filatyev, Alexander S / Obraztsov, Alexander N

    Nanotechnology

    2022  Volume 33, Issue 41

    Abstract: Improving the thruster efficiency is a crucial challenge for the development of space electric propulsion systems, especially advanced air-breathing thrusters utilizing the surrounding rarefied atmosphere as fuel. A significant reduction in thruster ... ...

    Abstract Improving the thruster efficiency is a crucial challenge for the development of space electric propulsion systems, especially advanced air-breathing thrusters utilizing the surrounding rarefied atmosphere as fuel. A significant reduction in thruster power consumption can be achieved by using field emission (FE) cathodes that do not require heating and have the highest energy efficiency. In this work, we study FE from nano-graphite thin films, consisting of carbon nanostructures with a high aspect ratio, and demonstrate their suitability for use in the space electric propulsion systems. The films shown appropriate FE characteristics in a wide range of gas pressures at high current loads in constant and pulsed operation modes. Based on the obtained experimental results, nano-graphite cathodes were employed for the design of an electron gun with increased reliability and minimized energy losses associated with electron extraction. The possibility of using such a gun in a specific air-breathing satellite operating in low Earth orbits is demonstrated.
    Language English
    Publishing date 2022-07-19
    Publishing country England
    Document type Journal Article
    ZDB-ID 1362365-5
    ISSN 1361-6528 ; 0957-4484
    ISSN (online) 1361-6528
    ISSN 0957-4484
    DOI 10.1088/1361-6528/ac7def
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Single crystal diamond tips for scanning probe microscopy.

    Obraztsov, Alexander N / Kopylov, Petr G / Loginov, Boris A / Dolganov, Mathew A / Ismagilov, Rinat R / Savenko, Natalia V

    The Review of scientific instruments

    2010  Volume 81, Issue 1, Page(s) 13703

    Abstract: Single crystal diamond tips with perfect pyramidal geometry were obtained by a combination of chemical vapor deposition and selective oxidation of polycrystalline films. The parameters of the deposition process were chosen to provide growth of a textured ...

    Abstract Single crystal diamond tips with perfect pyramidal geometry were obtained by a combination of chemical vapor deposition and selective oxidation of polycrystalline films. The parameters of the deposition process were chosen to provide growth of a textured film consisting of micrometer sized diamond crystallites embedded into nanodiamond ballas-like material. The heating of the film in an air environment was used for selective oxidation of the nanodiamond component. The films obtained contain free standing pyramidal single crystal diamond tips oriented by their apexes to the substrate surface. The tips were used for the fabrication of atomic force microscopy probes and their evaluation in comparison to common silicon probes.
    Language English
    Publishing date 2010-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209865-9
    ISSN 1089-7623 ; 0034-6748
    ISSN (online) 1089-7623
    ISSN 0034-6748
    DOI 10.1063/1.3280182
    Database MEDical Literature Analysis and Retrieval System OnLINE

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