第一原理解析に基づくダンベル型グラフェンナノリボン電子密度分布の歪み依存性の支配因子の検討

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  • First-principles analysis of dominant structural factors on the strain dependence of the electronic density state of dumbbell shape graphene nanoribbon

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<p>The electronic properties of graphene nanoribbons (GNRs) have a function of the ribbon width. It can vary from metallic-like ones to semiconductive-like ones when the width of single GNR is changed. Therefore, the novel structure of GNRs called dumbbell-shape GNR (DS-GNR) was proposed to achieve the development of highly sensitive, reliable, and deformable strain sensors. The DS-GNR consists of one long narrow GNR coalesced by two wide segments of GNRs at its both ends. The wide segments of DS-GNR possess the metallic-like electronic properties and the narrow segment of DS-GNR typifies the semiconductive-like electronic properties without uniaxial tensile strain. In this study, the strain-induced change of the electronic band structure of DS-GNR was analyzed by using the first-principles calculations. The range of the applied uniaxial tensile strain on DS-GNR was from 0% to 10%. When the length of the narrow segment of DS-GNR is longer than 4.3 nm, the effective bandgap located in the narrow segment changes obviously with the change of strain. The result indicates that the piezoresistive effect appear in the narrow segment, and thus high strain sensitivity of its resistivity can be applied to strain sensors.</p>

収録刊行物

  • 年次大会

    年次大会 2020 (0), J03204-, 2020

    一般社団法人 日本機械学会

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