Development of three dimensional graphene based high sensitivity gas sensor

• Project/Area Number: 18K14174
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 32010:Fundamental physical chemistry-related
• Research Institution: University of Tsukuba
• Principal Investigator: Ito Yoshikazu 筑波大学, 数理物質系, 准教授 (90700170)
• Project Period (FY): 2018-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2018: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
• Keywords: グラフェン / ガスセンサー / 水素 / 二酸化炭素 / 多孔質構造 / 分子吸着 / 多孔質 / 電気伝導度 / 吸着 / 酸化還元グラフェン / ガス吸着

Outline of Final Research Achievements

It is revealed that detection mechanisms of hydrogen molecules under hydrogen gas flowing conditions based on monolithic 3D nanoporous reduced graphene oxide at room temperature. The nanoporous reduced graphene oxide increases the molecular physisorption of hydrogen molecules without any catalytic metals or heating due to the dramatically increased surface area in comparison to the 2D graphene sheet and conventional reduced graphene oxide flakes. It was found that two different behaviors of resistance change that the resistance decreases due to charge transfer from the hydrogen molecules to the reduced graphene oxide at concentrations of adsorbed hydrogen molecules lower than 2.8 ppm, and conversely the resistance increases due to Coulomb scattering effects at concentrations of adsorbed hydrogen molecules exceeding 5.0 ppm, which is supported by density functional theory. These findings provide the development of catalyst free and non-heated physisorption-type molecular detection.

Academic Significance and Societal Importance of the Research Achievements

可燃性ガスを検出するために着火の恐れがあるような危険なセンシングをするのは本末転倒である。本研究は膨大な表面積総量を持つ多孔質グラフェンを採用しその表面に可燃性ガス分子を物理吸着させることによって室温かつ化学反応を起こさない気流下でのガス吸着センサーの提案をしている。特に水素は無極性分子であるため化学反応を伴うセンサーが主流である。燃料電池車や水素ステーションの安全性確保に向けて不慮の事故があっても着火の恐れが無い非加熱式水素ガスセンサーが開発できれば水素社会への貢献が期待される。このような着眼点で非加熱式ガスセンサーは安全な労働環境を実現する炭素材料系ガスセンサーの開発方針への貢献ができる。

Research Products

• [Int'l Joint Research] ジョンズ・ホプキンズ大学(米国)
• [Journal Article] Building a Reactive Armor Using S-Doped Graphene for Protecting Potassium Metal Anodes from Oxygen Crossover in K?O2 Batteries (2020)
  • Author(s): Hu Kailong、Qin Lei、Zhang Songwei、Zheng Jingfeng、Sun Jiaonan、Ito Yoshikazu、Wu Yiying
  • Journal Title: ACS Energy Letters Volume: 5 Issue: 6 Pages: 1788-1793
  • DOI: 10.1021/acsenergylett.0c00715
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Understanding the Detection Mechanisms and Ability of Molecular Hydrogen on ThreeDimensional Bicontinuous Nanoporous Reduced Graphene Oxide (2020)
  • Author(s): Yoshikazu Ito, Megumi Kayanuma, Yasuteru Shigeta, Jun-ichi Fujita, Yoichi Tanabe
  • Journal Title: Materials Volume: 13 Issue: 10 Pages: 2259-2259
  • DOI: 10.3390/ma13102259
  • NAID: 120007166901
  • Peer Reviewed / Open Access
• [Journal Article] Anchoring Single-Atom Mo and N on Edge-Rich Nanoporous Holey Graphene as Bifunctional Air Electrode in Zn-Air Batteries (2020)
  • Author(s): Peng Du, Kailong Hu, Juan Lyu, Huanglong Lia, Xi Lin, Guoqiang Xie, Xingjun Liu, Yoshikazu Ito, Hua-Jun Qiu
  • Journal Title: Applied Catalysis B: Environmental Volume: - Pages: 119172-119172
  • DOI: 10.1016/j.apcatb.2020.119172
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Metal and Nonmetal Codoped 3D Nanoporous Graphene for Efficient Bifunctional Electrocatalysis and Rechargeable Zn?Air Batteries (2019)
  • Author(s): Qiu Hua‐Jun、Du Peng、Hu Kailong、Gao Jiaojiao、Li Huanglong、Liu Pan、Ina Toshiaki、Ohara Koji、Ito Yoshikazu、Chen Mingwei
  • Journal Title: Advanced Materials Volume: 31 Issue: 19 Pages: 1900843-1900843
  • DOI: 10.1002/adma.201900843
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Chemical dopants on edge of holey graphene accelerate electrochemical hydrogen evolution reaction (2019)
  • Author(s): A. Kumatani, C. Miura, H. Kuramochi, T. Ohto, M. Wakisaka, Y. Nagata, H. Ida, Y. Takahashi, K. Hu, S. Jeong, J. Fujita, T. Matsue, Y. Ito,
  • Journal Title: Adv. Sci. Volume: - Issue: 10 Pages: 1900119-1900119
  • DOI: 10.1002/advs.201900119
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Effect of Graphene Encapsulation of NiMo Alloys on Oxygen Evolution Reaction (2019)
  • Author(s): Jeong Samuel、Hu Kailong、Ohto Tatsuhiko、Nagata Yuki、Masuda Hideki、Fujita Jun-ichi、Ito Yoshikazu
  • Journal Title: ACS Catalysis Volume: 10 Issue: 1 Pages: 792-799
  • DOI: 10.1021/acscatal.9b04134
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Lithium intercalation into bilayer graphene (2019)
  • Author(s): Ji Kemeng、Han Jiuhui、Hirata Akihiko、Fujita Takeshi、Shen Yuhao、Ning Shoucong、Liu Pan、Kashani Hamzeh、Tian Yuan、Ito Yoshikazu、Fujita Jun-ichi、Oyama Yutaka
  • Journal Title: Nature Communications Volume: 10 Issue: 1 Pages: 275-275
  • DOI: 10.1038/s41467-018-07942-z
  • NAID: 120007133576
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Boosting electrochemical water splitting via ternary NiMoCo hybrid nanowire arrays (2019)
  • Author(s): Hu Kailong、Wu Mingxing、Hinokuma Satoshi、Ohto Tatsuhiko、Wakisaka Mitsuru、Fujita Jun-ichi、Ito Yoshikazu
  • Journal Title: Journal of Materials Chemistry A Volume: 7 Issue: 5 Pages: 2156-2164
  • DOI: 10.1039/c8ta11250a
  • Peer Reviewed
• [Presentation] 立体的な多孔質構造を持たせたグラフェンによる応用用途開拓 (2019)
  • Author(s): 伊藤良一
  • Organizer: グラフェン・酸化グラフェン合同シンポジウム
  • Invited
• [Presentation] Graphene Encapsulation Effects on NiMo Alloy in Oxygen Evolution Reaction (2019)
  • Author(s): Samuel Jeong, Kailong Hu, Tatsuhiko Ohto, Yuki Nagata, Hideki Masuda, Jun-ichi Fujita, Yoshikazu Ito
  • Organizer: MATERIALS RESEARCHMEETING 2019,
  • Int'l Joint Research
• [Presentation] 化学結合を制御した多孔質グラフェンの物性とその応用研究 (2018)
  • Author(s): 伊藤良一
  • Organizer: 第11回酸化グラフェンシンポジウム
  • Invited