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Preparation of rapid conductive thin film layer by nano-copper blow-out by slightly oxidized copper particles and low temperature sintering

Research Project

Project/Area Number 19K22094
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 28:Nano/micro science and related fields
Research InstitutionHokkaido University

Principal Investigator

Yonezawa Tetsu  北海道大学, 工学研究院, 教授 (90284538)

Co-Investigator(Kenkyū-buntansha) グエン タンマイ  北海道大学, 工学研究院, 助教 (00730649)
徳永 智春  名古屋大学, 工学研究科, 助教 (90467332)
塚本 宏樹  北海道大学, 工学研究院, 学術研究員 (90629346)
Project Period (FY) 2019-06-28 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2020: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2019: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywords銅 / 微粒子 / 低温焼結 / 酸化 / 原子拡散 / ネッキング / 導電性 / 薄膜 / 焼成 / 低温 / ペースト / 微酸化銅 / 銅微粒子 / 低温焼成 / ナノ粒子 / 電子顕微鏡
Outline of Research at the Start

焼結用配線板としてポリマーベースフィルムを用いてその上に銅ナノ粒子・微粒子ペーストを印刷し、焼結させてフレキシブル銅配線フィルムを形成する。このベースフィルムは銅との熱膨張率差が小さい延伸ポリエステルフィルムややや高温での焼結実験の場合にはポリイミドフィルムを用いる。塗工はスクリーン印刷で行い、塗工厚はスクリーン線径により決定する。配線パターン分析、クロスカット評価による密着度測定、マイグレーション耐性試験、曲げ試験などを行い評価し、実用性を検証する。

Outline of Final Research Achievements

In this study, we synthesized slightly oxidized (CuxO, x>8) copper nanoparticles, copper nanoparticles with slightly oxidized phase on the surface layer and their mixtures as low temperature sintering materials. We succeeded in establishing an industrial synthesis method to obtain more than several tens of grams/batch. The obtained fine particles were dispersed in dipropylene glycol using a bead mill or a film swirling milling method. By determining the optimized milling conditions, we were able to synthesize a stable paste. At present, it was found that the copper particulate content could be as high as 80 wt% or more. When this paste was applied to a substrate and sintered at less than 200 degree C, we succeeded in forming a conductive film with a low resistivity within a few times that of the bulk. They also showed that the film formation mechanism is due to "nano-copper blowout," which is an enhanced diffusion of atoms.

Academic Significance and Societal Importance of the Research Achievements

本研究では、銅微粒子の焼結において微酸化相(Cu2OやCuOではなく、酸素比率の少ない酸化物相)の利用を検討し、それが低温で金属銅へ変換し焼結することが可能であることを示した。その際、結晶構造が変化することから銅原子が通常よりも大きく拡散することが期待される。実際の観測結果はそれを支持しその結果は高い学術的意義がある。これは、粒子同士の接合、ネッキング形成が容易になることを示し、高い導電性を持つ被膜の低温形成に役立つ。実際の観測結果もそれを支持しており、こうした結果は、銅微粒子の導電材料、接合材料への応用に大きな一歩を示した点で社会的意義が大きい。また、微酸化銅の材料化も本研究が世界初である。

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • Research Products

    (27 results)

All 2020 2019 Other

All Int'l Joint Research (1 results) Journal Article (9 results) (of which Int'l Joint Research: 6 results,  Peer Reviewed: 8 results,  Open Access: 4 results) Presentation (16 results) (of which Int'l Joint Research: 4 results,  Invited: 8 results) Remarks (1 results)

  • [Int'l Joint Research] チュラロンコン大学(タイ)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Surfactant-stabilized copper paticles for low-temperature sintering: Paste preparation using a milling with small zirconia beads: Effect of pre-treatment with the disperse medium2020

    • Author(s)
      Liu Shuai、Tokura Rintaro、Thanh Nguyen Mai、Tsukamoto Hiroki、Yonezawa Tetsu
    • Journal Title

      Advanced Powder Technology

      Volume: 31 Issue: 11 Pages: 4570-4575

    • DOI

      10.1016/j.apt.2020.10.004

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Synthesis of Au@Cu2O Core-Shell Nanoparticles with Tunable Shell Thickness and Their Degradation2020

    • Author(s)
      Shilei Zhu, Dan Deng, Mai Thanh Nguyen, Yuen-ting Rachel Chau, Cheng-Yen Wen, Tetsu Yonezawa
    • Journal Title

      Langmuir

      Volume: 印刷中 Issue: 13 Pages: 3386-3392

    • DOI

      10.1021/acs.langmuir.0c00382

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] 濃厚分散系としての導電インク・ペーストの作製ならびに微細構造検証2020

    • Author(s)
      米澤徹
    • Journal Title

      日本接着学会誌

      Volume: 56

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] 高分子修飾微粒子・ナノ粒子の熱的構造制御2020

    • Author(s)
      松原正樹・蟹江澄志・米澤 徹
    • Journal Title

      Accounts of Materials Science Reserach

      Volume: 5 Pages: 11-17

    • Related Report
      2019 Research-status Report
    • Open Access
  • [Journal Article] Sintering Copper nanoparticles with photonic additive for printed conductive patterns by intense pulsed light2019

    • Author(s)
      Wan-Yu Chung, Yi-Chin Lai, Tetsu Yonezawa, and Ying-Chih Liao
    • Journal Title

      Nanomaterials

      Volume: 9 Issue: 8 Pages: 1071-1071

    • DOI

      10.3390/nano9081071

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] High Aspect Ratio and Post-processing Free Silver Nanowires as Top Electrodes for Inverted-structured Photodiode2019

    • Author(s)
      Min JIa Saw, Batu Ghosh, Mai Thanh Nguyen, Kridsada Jirasattayaporn, Soorathep Kheawhom, Naoto Shirahata, and Tetsu Yonezawa
    • Journal Title

      ACS Omega

      Volume: 4 Issue: 8 Pages: 13303-13308

    • DOI

      10.1021/acsomega.9b01479

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Synthesis of Sn/Ag-Sn nanoparticles via room temperature galvanic reaction and diffusion2019

    • Author(s)
      Min Jia Saw, Mai Thanh Nguyen, Shilei Zhu, Yongming Wang, and Tetsu Yonezawa
    • Journal Title

      RSC Advances

      Volume: 9 Issue: 38 Pages: 21786-21792

    • DOI

      10.1039/c9ra02987g

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Porous ZnV2O4 Nanowire for Stable and High-rate Lithium Ion Battery Anodes2019

    • Author(s)
      Lyn Marie Z. De Juan-Corpuz, Mai Thanh Nguyen, Ryan D. Corpuz, Tetsu Yonezawa, Nataly Carolina Rosero-Navarro, Kiyoharu Tadanaga, Tomoharu Tokunaga, and Soorathep Kheawhom
    • Journal Title

      ACS Applied Nano Materials

      Volume: 2 Issue: 7 Pages: 4247-4256

    • DOI

      10.1021/acsanm.9b00703

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Size-tunable Alumina-encapsulated Sn-based Phase Change Materials for Thermal Energy Storage2019

    • Author(s)
      Shilei Zhu, Mai Thanh Nguyen, Tomoharu Tokunaga, and Tetsu Yonezawa
    • Journal Title

      ACS Applied Nano Materials

      Volume: 2 Issue: 6 Pages: 3752-3760

    • DOI

      10.1021/acsanm.9b00649

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] ナノ粒子を利用するSDGs2020

    • Author(s)
      米澤徹
    • Organizer
      千歳市立北斗中学校科学講演会
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] Structural strategy for low temperature sintering of copper2020

    • Author(s)
      Tetsu Yonezawa
    • Organizer
      A3 Foresight & 5 Star Alliance Joint Workshop on “Organic/Inorganic Hybrid Nano Materials and Bio Imaging”
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 銅微粒子の分散・ペースト化と低温焼結性2020

    • Author(s)
      米澤徹
    • Organizer
      日本ディスパージョンセンター設立記念Webセミナー
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] 界面活性剤で保護した低温焼成銅微粒子の分散と表面の影響2020

    • Author(s)
      戸倉凜太郎・米澤 徹
    • Organizer
      日本化学会秋季事業第10回CSJ化学フェスタ2020
    • Related Report
      2020 Annual Research Report
  • [Presentation] 銅微粒子の高濃度分散と電子部品部材への応用2020

    • Author(s)
      米澤徹
    • Organizer
      第30回 電子デバイス実装研究委員会
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] 界面活性剤で保護した低温焼成銅微粒子の分散2020

    • Author(s)
      戸倉凜太郎・米澤 徹
    • Organizer
      2020年日本金属学会秋期第167回公演大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Synthesis of noble metal / Cu2O hybrid core-shell nanoparticles2020

    • Author(s)
      Dan Deng, Shilei Zhu, Mai Thanh Nguyen, Tetsu Yonezawa
    • Organizer
      2019年度日本金属学会・日本鉄鋼協会 両北海道支部合同冬季講演大会
    • Related Report
      2019 Research-status Report
  • [Presentation] 金属微粒子のインク・ペースト化と配線材としての利用2019

    • Author(s)
      米澤 徹
    • Organizer
      第7回 分散・凝集のすべて
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] 北海道大学材料科学部門 展示会展示2019

    • Author(s)
      米澤 徹
    • Organizer
      SEMICON JAPAN
    • Related Report
      2019 Research-status Report
  • [Presentation] 金属微粒子のインク・ペースト化と配線材としての利用2019

    • Author(s)
      米澤 徹
    • Organizer
      日本ディスパージョンセンター設立記念セミナー(第2回)
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] 低温焼成に向けた銅微粒子系とその分散安定化2019

    • Author(s)
      米澤 徹
    • Organizer
      Mixing Vision 2019
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Ag NWs as Tope Electrode for Organic/Inorganic Photodiode2019

    • Author(s)
      Min Jia Saw, Mai Thanh Nguyen, and Tetsu Yonezawa
    • Organizer
      An International Conference on Colloid & Interface Science Celebrating the 70th Anniversary of the Divisional Meeting of Division of Colloid and Surface Chemistry, The Chemical Society of Japan
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Structural strategy for low temperature sintering of copper2019

    • Author(s)
      Tetsu Yonezawa
    • Organizer
      The 13th Pacific Rim Conference of Ceramic Societies
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Preparation of Ag-Sn Coated Sn Nanoparticles2019

    • Author(s)
      Min Jia Saw, Mai Thanh Nguyen, and Tetsu Yonezawa
    • Organizer
      The 3rd A3 Forsight Symposium on Organic/Inorganic Nanohybrid Platforms for Precision Tumor Imagin and Therapy
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 低温焼成システム構築に向けた CuOx 微酸化物系の構築2019

    • Author(s)
      米澤徹 , 塚本宏樹
    • Organizer
      第29回マイクロエレクトロニクスシンポジウム秋季大会
    • Related Report
      2019 Research-status Report
  • [Presentation] 低温焼結に向けた銅微粒子系2019

    • Author(s)
      米澤徹 , 塚本宏樹
    • Organizer
      第29回マイクロエレクトロニクスシンポジウム秋季大会
    • Related Report
      2019 Research-status Report
  • [Remarks] 先進材料ハイブリッド工学研究室

    • URL

      https://nanoparticle.hokkaido.university/

    • Related Report
      2020 Annual Research Report 2019 Research-status Report

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Published: 2019-07-04   Modified: 2023-01-30  

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