Development of graphene oxide based room temperature ferromagnets and superconductors by radical manipulation

• Project/Area Number: 26600076
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Applied materials
• Research Institution: National Institute for Materials Science
• Principal Investigator: Taniguchi Takaaki 国立研究開発法人物質・材料研究機構, 国際ナノアーキテクトニクス研究拠点, 主任研究員 (50583415)
• Co-Investigator(Kenkyū-buntansha): YOKOI HIROYUKI 熊本大学, 大学院自然科学研究科, 准教授 (50358305)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000); Fiscal Year 2015: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000); Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: グラフェン / 酸化グラフェン / 強磁性 / 超伝導 / ナノシート / 超電導

Outline of Final Research Achievements

This study have focused on development of new room-temperature ferromagnets and superconductors based on reduced graphene oxide. The reduced graphene oxides by electrochemical,thermal,photo, chemical, and hydrothermal approach yielded various graphene oxides with different local- and micro-structures to show magnetic properties depending on the reduction methods. In particular, photo-reduced graphene oxide have carbon vacancies with partial hydrogen terminations, which gave ferromagnetic properties. We also found that electrochemical reduction removed carbon radicals, while re-oxidation gave carbon radicals, where these reactions were reversible. Although we could not archive to find out the room-temperature superconductivities in our samples, we revealed potential of giant magneto-resistance and large pseudo-capacitance in electrochemically reduced graphene oxide.

Research Products

• [Journal Article] Novel pot-shaped carbon nanomaterial synthesized in a submarine-style substrate heating CVD method (2016)
  • Author(s): Hiroyuki Yokoi, Kazuto Hatakeyama, Takaaki Taniguchi, Michio Koinuma, Masahiro Hara and Yasumichi Matsumoto
  • Journal Title: Journal of Materials Research Volume: 31 Issue: 1 Pages: 117-126
  • DOI: 10.1557/jmr.2015.389
  • NAID: 120005764248
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Oxide: A Fertile Nanosheet for Various Applications (2015)
  • Author(s): S. Obata, K. Saiki, T. Taniguchi, T. Ihara, Y. Kitamura, and Y. Matsumoto
  • Journal Title: J. Phys. Soc. Jpn. Volume: 84 Issue: 12 Pages: 121012-121029
  • DOI: 10.7566/jpsj.84.121012
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] pH-driven, reversible epoxy ring opening/closing in graphene oxide (2015)
  • Author(s): Takaaki Taniguchi, Seiji Kurihara,, Hikaru Tateishi, Kazuto Hatakeyama, Michio Koinuma, Hiroyuki Yokoi, Masahiro Hara, Hayato Ishikawa, Yasumichi Matsumoto
  • Journal Title: Carbon Volume: 84 Pages: 560-566
  • DOI: 10.1016/j.carbon.2014.12.054
  • Peer Reviewed
• [Journal Article] Correlated Optical and Magnetic Properties in Photoreduced Graphene Oxide (2014)
  • Author(s): Takaaki Taniguchi, Hiroyuki Yokoi, Masaki Nagamine, Hikaru Tateishi, Asami Funatsu, Kazuto Hatakeyama, Chikako Ogata, Masao Ichida, Hiroaki Ando, Michio Koinuma, and Yasumichi Matsumoto
  • Journal Title: Journal of physical chemistry C Volume: 118 Issue: 48 Pages: 28258-28265
  • DOI: 10.1021/jp509399x
  • Peer Reviewed
• [Presentation] Engineering Luminescent and Magnetic Properties of Graphene Oxide by Photochemical Reactions (2014)
  • Author(s): Takaaki Taniguchi
  • Organizer: International Union of Materials Research Societies
  • Place of Presentation: 福岡大学
  • Year and Date: 2014-08-24 – 2014-08-28
  • Invited