Fabrication of innovative carbon nanotube metal composite wiring material with large current capacity

• Project/Area Number: 18K18814
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 18:Mechanics of materials, production engineering, design engineering, and related fields
• Research Institution: Waseda University
• Principal Investigator: Kawada Hiroyuki 早稲田大学, 理工学術院, 教授 (20177702)
• Co-Investigator(Kenkyū-buntansha): 荒尾 与史彦 東京工業大学, 物質理工学院, 助教 (40449335)
• Project Period (FY): 2018-06-29 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000); Fiscal Year 2019: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000); Fiscal Year 2018: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
• Keywords: カーボンナノチューブ / 電気特性 / メッキ / 導電率 / ドーピング / CNT

Outline of Final Research Achievements

In this study, we aimed to create carbon nanotube (CNT) yarns with excellent electrical properties, and compared CNT untwisted yarns with conventional CNT yarns by conducting doping treatment, heat treatment, and compounding with metal by plating treatment. A CNT untwisted yarn having excellent electrical properties was obtained. In particular, CNT non-twisted yarn has a conductivity of 3.87×10 to 5 S/m when subjected to densification and iodine monochloride (ICl) doping treatment, and conductivity of 5.12× when subjected to graphitization treatment and ICl doping treatment. We obtained CNT non-twisted yarn with excellent electrical properties of 10^5S/m. Furthermore, it was confirmed that the graphitized fiber has a specific current capacity of 172 Am/kg, which is extremely superior to that of copper wire.

Academic Significance and Societal Importance of the Research Achievements

近年，電子デバイスの小型化・軽量化に伴い配線材料の細線かつ軽量化が求められている．本研究は軽量かつ優れた電気特性を示すナノ材料のCNTをマクロスケール化し，既存の配線材料の代替となるCNT繊維を作製する．また複数の電気特性向上手法を組み合わせることの有用性を示す学術的意義を有する．本研究では導電率が最大5.12×10^5S/mと銅の7×10^7S/mを超える電気特性の取得は実現されなかった．しかしこれらの優れた電気特性を有する繊維を金属と複合化させるなど，今後の研究のさらなる進展により軽量かつ高導電率，大電流容量と既存の配線材料を上回る性質を有するCNT糸の作製が期待される．

Research Products

• [Journal Article] 電気めっき処理によるカーボンナノチューブ/銅複合配線の創製および許容電流評価 (2018)
  • Author(s): 金太成，酒井貴広，星雄大，二川秀史，細井厚志，川田宏之
  • Journal Title: 日本機械学会論文集 Volume: 84 Pages: 17-17
  • NAID: 130006320927
  • Peer Reviewed / Open Access
• [Presentation] Electrical characterization of highly conductive CNT yarn by graphitization and high densification treatment (2019)
  • Author(s): Akira Itoh, Kotaro Kajiwara, Takeshi Kizaki, Atsushi Hosoi, Hiroyuki Kawada
  • Organizer: International Mechanical Engineering Congress & Exposition (IMECE)
  • Int'l Joint Research
• [Presentation] abrication of lightweight Cu/untwisted MWCNT yarn composite with high current capacity value (2018)
  • Author(s): Yuta Hoshi, Kotaro Kajihara, Tae Sung Kim, Atsushi Hosoi, Hiroyuki Kawada
  • Organizer: ASC 33rd Annual Technical Conference and 18th US-Japan Conference on Composite Materials