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2015 年度 実施状況報告書

グラフェンヒートスプレッダーの開発を目的としたグラフェン-基板界面効果の解明

研究課題

研究課題/領域番号 15K17987
研究機関九州大学

研究代表者

Wang Haidong  九州大学, 工学(系)研究科(研究院), 助教 (30729405)

研究期間 (年度) 2015-04-01 – 2017-03-31
キーワードsuspended graphene / thermal conductivity / substrate effect / heat spreader
研究実績の概要

The ultra-high thermal conductivity of graphene makes it a promising material for thermal management in micro/nano scales. Due to its atomic thickness, the graphene/substrate interaction could significantly limit the heat transport in graphene. In the present project, we precisely measured the thermal conductivity of suspended single-layer graphene (SLG) and investigate the substrate effect quantitatively. Some important progresses have been achieved in the last year. We have developed a novel method for fabricating suspended SLG nano-electronic device. Both intrinsic electrical and thermal conductivities of SLG can be measured simultaneously. The thermal conductivity of SLG is about 2300W/mK at room temperature, decreasing as temperature increases. Meanwhile, the nanohole defect and geometric size have notable effect on the thermal conductivity of SLG. The result also indicates that the electrons contribute less than 1% to the heat transport in graphene. The thermal conductivity of SLG supported by SiO2 substrate is 600 W/mK, only about 25% of the suspended SLG. This comparison demonstrates that the substrate effect play an important role in restricting the phonon transport in SLG even more than the nanohole defect and layer-layer interaction. In order to achieve high heat transport ability, the graphene needs to be released from the substrate. A new H-type sensor device has been developed as a prototype to use the suspended SLG as heat spreader in application.

現在までの達成度 (区分)
現在までの達成度 (区分)

1: 当初の計画以上に進展している

理由

The project has been smoothly carried out. The suspended SLG nano-electronic devices have been successfully fabricated. The thermal conductivity of SLG has been measured by T-type sensor. The experimental result and theoretical analysis have been published in the journal of Scientific Reports and Carbon. Two more manuscripts have been submitted and under review.

今後の研究の推進方策

Because the high thermal conductivity of graphene only exists in a free-standing membrane without substrate interaction,the suspended structure is necessary for enhancing the heat transport. We designed a prototype of H-type sensor to study the feasibility of suspended graphene heat spreader. The experiment will be carried out in 2016.

次年度使用額が生じた理由

The incurring amount needs to be used for purchasing necessary experimental materials and related consumables.

次年度使用額の使用計画

I plan to purchase single and multi-layer graphene membranes and prepare suspended graphene sample for experiment.

  • 研究成果

    (2件)

すべて 2016

すべて 雑誌論文 (2件) (うち国際共著 2件、 査読あり 2件、 オープンアクセス 2件、 謝辞記載あり 2件)

  • [雑誌論文] In-situ measurement of the heat transport in defect- engineered free-standing single-layer graphene2016

    • 著者名/発表者名
      Haidong Wang, Kosaku Kurata, Takanobu Fukunaga, Hiroshi Takamatsu, Xing Zhang, Tatsuya Ikuta, Koji Takahashi, Takashi Nishiyama, Hiroki Ago and Yasuyuki Takata
    • 雑誌名

      Scientific Reports

      巻: 6 ページ: 21823

    • DOI

      DOI: 10.1038/srep21823

    • 査読あり / オープンアクセス / 国際共著 / 謝辞記載あり
  • [雑誌論文] A simple method for fabricating free-standing large area fluorinated single-layer graphene with size-tunable nanopores2016

    • 著者名/発表者名
      Haidong Wang, Kosaku Kurata, Takanobu Fukunaga, Hiroshi Takamatsu, Xing Zhang, Tatsuya Ikuta, Koji Takahashi, Takashi Nishiyama, Hiroki Ago and Yasuyuki Takata
    • 雑誌名

      Carbon

      巻: 99 ページ: 564-570

    • DOI

      http://dx.doi.org/10.1016/j.carbon.2015.12.070

    • 査読あり / オープンアクセス / 国際共著 / 謝辞記載あり

URL: 

公開日: 2017-01-06  

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