单原子层MoS2的压电,用于能量转换和压电学
Wenzhuo Wu1, Lei Wang2, Yilei Li3
1School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, USA.
Nature
|October 16, 2014
概括
二维二硫化物 (MoS2) 具有压电性,在应力时产生电压和电流. 这种效应在单层MoS2中最强,为新的电子应用铺平了道路.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 纳米技术 纳米技术
背景情况:
- 材料如纳米线和薄膜的压电性质对于传感器,传感器和电子设备至关重要.
- 二维 (2D) 材料具有高结晶性和应变耐受性,使它们成为先进的压电应用的前景.
- 单层MoS2在理论上被预测为强烈的压电效应,但由于原子层的方向,这种效应大体上会减少.
研究的目的:
- 实验性地研究二维MoS2.2的压电特性.
- 探索MoS2片中的原子层数量与它们的压电输出之间的关系.
- 为了证明2D MoS2在压力电子效应和能量转换中的潜力.
主要方法:
- 制造和特征的薄MoS2片与不同数量的原子层.
- 将循环拉伸和释放应用于MoS2片,以测量压电电压和电流.
- 将应变方向旋转90°以观察压电输出中的变化.
- 运输测量以分析单层,双层和散装MoS2.2中的压力电子效应.
主要成果:
- 循环拉伸的MoS2片与奇数的原子层产生振荡的压电电压和电流.
- 对于具有偶数原子层的MoS2片,没有观察到压电输出.
- 一个单一单层的MoS2片,应力为0.53%,产生了15mV和20 pA的峰值输出,机械到电能转换效率为5.08%.
- 压电输出随着厚度的减少而增加,并且在90°变压旋转时反转信号.
- 在单层MoS2中观察到强烈的皮埃佐特龙效应,但在双层或散装MoS2中没有.
结论:
- 原子层的数量显著影响MoS2.2的压电行为.
- 二维的MoS2,特别是单层,表现出显著的压电和压电子效应.
- 在2D MoS2中压电和半导体性能的合为提供纳米设备的动力和开发可调节/可拉伸电子产品开辟了可能性.
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