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Piezoelectricity of single - atomic - layer MoS_2 for energy conversion and piezotronics

机译:用于能量转换和压电的单原子层MoS_2的压电。

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摘要

The piezoelectric characteristics of nanowires, thin films and bulk crystals have been closely studied for potential applications in sensors, transducers, energy conversion and electronics. With their high crys-tallinity and ability to withstand enormous strain, two-dimensional materials are of great interest as high-performance piezoelectric materials. Monolayer MoS_2 is predicted to be strongly piezoelectric, an effect that disappears in the bulk owing to the opposite orientations of adjacent atomic layers. Here we report the first experimental study of the piezoelectric properties of two-dimensional MoS_2 and show that cyclic stretching and releasing of thin MoS_2 flakes with an odd number of atomic layers produces oscillating piezoelectric voltage and current outputs, whereas no output is observed for flakes with an even number of Layers. A single monolayer flake strained by 0.53% generates a peak output of 15 mV and 20 pA, corresponding to a power density of 2mWm~(-2) and a 5.08% mechanical-to-electrical energy conversion efficiency. In agreement with theoretical predictions, the output increases with decreasing thickness and reverses sign when the strain direction is rotated by 90°. Transport measurements show a strong piezotronic effect in single-layer MoS_2, but not in bilayer and bulk MoS_2. The coupling between piezoelectricity and semiconducting properties in two-dimensional nanomaterials may enable the development of applications in powering nanodevices, adaptive bioprobes and tunable/stretchable electronics/optoelectronics.%二维半导体材料因其不同寻常的、有潜在用途的物理性质而成为很多研究工作的焦点。现在,Wenzhou Wu及同事证实了以下理论预期:这样一种材料(二硫化钼)在其单层形式中有强压电性。机械性质和电性质的这种耦合,为纳米尺度的机电设备在传感和集能方面的应用提供了可能性。
机译:纳米线,薄膜和块状晶体的压电特性已被仔细研究,以用于传感器,换能器,能量转换和电子领域。二维材料具有高的哭声倾角和承受巨大应变的能力,因此作为高性能压电材料备受关注。预测单层MoS_2是强压电的,由于相邻原子层的相反方向,这种效应在主体中消失了。在这里,我们报道了二维MoS_2压电特性的第一项实验研究,结果表明,具有奇数原子层的薄MoS_2薄片的周期性拉伸和释放会产生振荡的压电电压和电流输出,而没有观察到带有Mos_2的薄片的输出。偶数层。应变为0.53%的单层薄片产生的峰值输出为15 mV和20 pA,对应于2mWm〜(-2)的功率密度和5.08%的机电能量转换效率。与理论预测一致,当应变方向旋转90°时,输出随厚度减小而增加,并反转符号。传输测量显示出在单层MoS_2中有很强的压电效应,但在双层MoS_2和整体MoS_2中却没有。二维纳米材料中压电性和半导性之间的耦合可能使在驱动纳米器件,自适应生物探针和可调谐/可拉伸电子/光电方面的应用得以发展。%二维半导体材料因其不同寻常的,有潜在用途的物理性质而现在,Wenzhou Wu和同事证实了以下理论预期:这样的材料(二硫化钼)在其单层形式中有强氯化性。机械性质和电性质的这种取代,为纳米尺度的机电设备在传感和集能方面的应用提供了可能性。

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  • 来源
    《Nature》 |2014年第7523期|470-474B1|共6页
  • 作者单位

    School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, USA;

    Department of Electrical Engineering, Columbia University, New York, New York 10027, USA;

    Department of Physics, Columbia University, New York, New York 10027, USA;

    Department of Mechanical Engineering, Columbia University, New York, New York 10027, USA;

    School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, USA;

    School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, USA;

    Department of Mechanical Engineering, Columbia University, New York, New York 10027, USA;

    Department of Mechanical Engineering, Columbia University, New York, New York 10027, USA;

    Department of Mechanical Engineering, Columbia University, New York, New York 10027, USA;

    Department of Physics, Columbia University, New York, New York 10027, USA;

    Department of Mechanical Engineering, Columbia University, New York, New York 10027, USA;

    School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, USA,Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, 100083 Beijing, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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