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Formation and control of nanostructure bundles by helium plasma exposure

Research Project

Project/Area Number 20K22322
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0202:Condensed matter physics, plasma science, nuclear engineering, earth resources engineering, energy engineering, and related fields
Research InstitutionUniversity of Tsukuba

Principal Investigator

Hwangbo Dogyun  筑波大学, 数理物質系, 助教 (00870908)

Project Period (FY) 2020-09-11 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsタングステン / プラズマー材料相互作用 / ヘリウムプラズマ / ナノ構造バンドル / プラズマー壁相互作用 / スパッタリングー再堆積 / RF変調イオン / ヘリウム / ナノ構造 / ダイバータ
Outline of Research at the Start

ヘリウムプラズマ-金属(特にタングステン(W))相互作用により生成される金属ナノ繊維が集積したバンドル構造 (NTBs)の生成機構を明らかにする。直線型プラズマ装置を用いて,W表面の経時変化を共焦点顕微鏡により観測し,NTBsの成長過程を明らかにする。さらに,NTBsの生成条件として,入射イオンエネルギーの変調効果と不純物粒子によるスパッタリング-再堆積効果を制御した実験を行い,未解明であるNTBsの成長要因を解明する。以上により,プラズマ応用,核融合研究の進展に貢献するNTBs形成制御の学術的基盤を確立する。

Outline of Final Research Achievements

Helicon-mode helium plasma was successfully demonstrated in the RF (13.56 MHz) frequency plasma device APSEDAS. A voltage bias system to a sample was established, and the formation of nanostructures was confirmed. It was found that the shape of the surface nanostructure differs with the change in plasma parameters during the helicon transition. It was also clarified that when impurities are observed in the early stage of plasma generation, the formation of uniform nanostructures is suppressed on the surface and needle-shaped nanostructure bundles are fabricated. It is considered that the RF ion modulation and the sputtering due to impurity contents affected the formation of the needle-shaped bundle structures. Succesive research would focus on clarying the effects of RF modulation of the biasing and the impurity concentration control experiment.

Academic Significance and Societal Importance of the Research Achievements

本研究は純金属とプラズマのみで発生する金属構造変化に注目する研究である。近年、ヘリウムプラズマに加えて不純物ガスの存在や金属面へ入射するイオンのエネルギー変調等が既存と大別されるバンドル構造を形成することを確認されており、本研究ではそのバンドル構造が一部の実験装置の特殊的な実験条件に限定される現象でなく、普遍的に発生する現象であることを示した。化学反応を含まない、ドライプロセスでの金属ナノ構造化は表面構造の制御技術の発展により光触媒、電界放出材、熱電素材など様々な応用が予想されるため、今後ともナノ構造やバンドル構造の生成機構の理解や構造制御技術の確立が期待できる。

Report

(3 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • Research Products

    (21 results)

All 2022 2021 2020 Other

All Int'l Joint Research (4 results) Journal Article (9 results) (of which Int'l Joint Research: 5 results,  Peer Reviewed: 9 results,  Open Access: 6 results) Presentation (8 results) (of which Int'l Joint Research: 4 results)

  • [Int'l Joint Research] Moscow Engineering Physics Institute(ロシア連邦)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Max-Planck Institute for Plasma Physics(ドイツ)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] University of California San Diego(米国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] University of Liverpool(英国)

    • Related Report
      2021 Annual Research Report
  • [Journal Article] Changes in morphology and field emission property of nano-tendril bundles after high temperature annealing2022

    • Author(s)
      Zhang Rongshi、Kajita Shin、Hwangbo Dogyun、Sinelnikov Dmitry、Tanaka Hirohiko、Ohno Noriyasu
    • Journal Title

      Nuclear Materials and Energy

      Volume: 31 Pages: 101178-101178

    • DOI

      10.1016/j.nme.2022.101178

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Effect of deuterium fluence on deuterium retention in tungsten with fibrous nanostructured layer in a compact plasma device APSEDAS2022

    • Author(s)
      Takahisa SAKAI, Dogyun HWANGBO, Naoki ORIKASA, Mikoto KUSUMOTO, Katsutomo TAKATSU, Haru YOSHIDA, Aoi FUJIMORI, Ryusei NITTA, Mizuki SAKAMOTO
    • Journal Title

      Plasma and Fusion Research

      Volume: Accepted

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Enhancement of Arc Ignition on Tungsten in Helium Plasmas with Impurity Gases2021

    • Author(s)
      ZHANG Rongshi、KAJITA Shin、HWANGBO Dogyun、TANAKA Hirohiko、OHNO Noriyasu
    • Journal Title

      Plasma and Fusion Research

      Volume: 16 Issue: 0 Pages: 2405069-2405069

    • DOI

      10.1585/pfr.16.2405069

    • NAID

      130008050961

    • ISSN
      1880-6821
    • Year and Date
      2021-05-24
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Observation of Arc Trails with Significant Damage due to Glow Discharge Wall Conditioning in the Large Helical Device2021

    • Author(s)
      HAYASHI Yuki、MASUZAKI Suguru、MOTOJIMA Gen、HWANGBO Dogyun、FUJIWARA Yutaka、ZHAO Mingzhong、the LHD Experiment Group
    • Journal Title

      Plasma and Fusion Research

      Volume: 16 Issue: 0 Pages: 1202061-1202061

    • DOI

      10.1585/pfr.16.1202061

    • NAID

      130008037275

    • ISSN
      1880-6821
    • Year and Date
      2021-04-21
    • Related Report
      2021 Annual Research Report 2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Plasma-wall interaction studies in W7-X: main results from the recent divertor operations2021

    • Author(s)
      Dhard C P、Brezinsek S、Mayer M、Naujoks D、Masuzaki S、Zhao D、Yi R、Oelmann J、Schmid K、Romazanov J、Pardanaud C、Kandler M、Kharwandikar A K、Schlisio G、Volzke O、Grote H、Gao Y、Rudischhauser L、Goriaev A、Wauters T、Kirschner A、Sereda S、Wang E、Rasinski M、Dittmar T、Motojima G、Hwangbo D et al.,
    • Journal Title

      Physica Scripta

      Volume: 96 Issue: 12 Pages: 124059-124059

    • DOI

      10.1088/1402-4896/ac35c0

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The effects of impurity gas seeding on the growth of fuzzy tungsten2021

    • Author(s)
      McCarthy Patrick、Hwangbo Dogyun、Kajita Shin、Bradley James W.
    • Journal Title

      Journal of Nuclear Materials

      Volume: 556 Pages: 153125-153125

    • DOI

      10.1016/j.jnucmat.2021.153125

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Nano-tendril bundles behavior under plasma-relevant electric fields2021

    • Author(s)
      Kulagin V.V.、Sinelnikov D.N.、Bulgadaryan D.G.、Efimov N.E.、Kurnaev V.A.、Hwangbo D.、Ohno N.、Kajita S.
    • Journal Title

      Vacuum

      Volume: 183 Pages: 109799-109799

    • DOI

      10.1016/j.vacuum.2020.109799

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Size distribution of nano-tendril bundles with various additional impurity gases2020

    • Author(s)
      Zhang Rongshi、Hwangbo Dogyun、Kajita Shin、Tanaka Hirohiko、Ohno Noriyasu
    • Journal Title

      Nuclear Materials and Energy

      Volume: 25 Pages: 100843-100843

    • DOI

      10.1016/j.nme.2020.100843

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Unipolar arc plasmas on nanostructured tungsten surfaces under perpendicular magnetic field2020

    • Author(s)
      Hwangbo Dogyun、Nishijima Daisuke、Kajita Shin、Doerner Russell P、Ohno Noriyasu
    • Journal Title

      Plasma Sources Science and Technology

      Volume: 29 Issue: 12 Pages: 125015-125015

    • DOI

      10.1088/1361-6595/abc817

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Motion analysis of arc spots on tungsten fuzz by means of self-avoiding random walk model2022

    • Author(s)
      Dogyun Hwangbo, Daisuke Nishijima, Shin Kajita, Noriyasu Ohno
    • Organizer
      14th International Symposium on Advanced Plasma Science and its Applications for Nitrides and Nanomaterials
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Overheating of Nanostructured Tendril Bundles due to Thermo-Field Emission2021

    • Author(s)
      Dmitry Sinelnikov, Daniel Bulgadaryan, Nikita Efimov, Dogyun Hwangbo, Vladimi Kulagin, Valery Kurnaev, Shin Kajita, Noriyasu Ohno
    • Organizer
      29th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Effect of helium pre-exposure on deuterium retention of tungsten in a compact plasma device APSEDAS2021

    • Author(s)
      Takahisa Sakai, Mizuki Sakamoto, Dogyun Hwangbo, Naoki Orikasa, Mikoto Kusumoto, Katsutomo Takatsu, Haru Yoshida, Ryusei Nitta, Aoi Fujimori
    • Organizer
      The 30th International Toki Conference on Plasma and Fusion Research
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 小型プラズマ生成装置APSEDASにおけるヘリウムプラズマ予照射したタングステンの重水素保持特性2021

    • Author(s)
      堺貴久, 坂本瑞樹, 皇甫度均, 折笠直輝, 楠本美香都, 高津克朋, 吉田晴, 新田龍世, 藤森あおい
    • Organizer
      プラズマ・核融合学会第38回年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 小型プラズマ装置APSEDASの水素プラズマ照射時における金属表面温度のリサイクリングへの影響2021

    • Author(s)
      折笠直輝, 坂本瑞樹, 皇甫度均, 四竈泰一, 堺貴久,高津克朋, 楠本美香都, 吉田晴, 新田龍世, 藤森あおい
    • Organizer
      プラズマ・核融合学会第38回年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 小型プラズマ生成装置APSEDASにおける透過プローブを用いた材料中の水素挙動評価2021

    • Author(s)
      楠本美香都, 坂本瑞樹, 皇甫度均, 折笠直輝, 堺貴久, 高津克朋, 藤森あおい
    • Organizer
      プラズマ・核融合学会第38回年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] ヘリウム-タングステン共堆積層における重水素吸蔵特性2021

    • Author(s)
      高津克朋, 坂本瑞樹, 皇甫度均, 折笠直輝, 堺貴久, 楠本美香都, 吉田晴, 新田龍世, 藤森あおい
    • Organizer
      プラズマ・核融合学会第38回年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Motion analysis of arc spots on nanostructured tungsten under axial magnetic field2021

    • Author(s)
      Dogyun Hwangbo、Daisuke Nishijima、Shin Kajita、Russell P. Doerner、Noriyasu Ohno
    • Organizer
      13th International Symposium on Advanced Plasma Science and its Applications for Nitrides and Nanomaterials
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research

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Published: 2020-09-29   Modified: 2023-01-30  

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