Investigation of the dynamic bending properties of MoS2 thin films by interference colours.
Investigation of the dynamic bending properties of MoS2 thin films by interference colours.
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通过干涉色研究MoS2薄膜的动态弯曲特性
DOI：
10.1038/srep18441
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发表时间：
2015-12-18
影响因子：
4.6
通讯作者：
Gao Y
中科院分区：
文献类型：
--
作者：
Wang P;Xiao S;Li X;Lyu B;Huang Y;Cheng S;Huang H;He J;Gao Y
报道了一种用普通光学显微镜观察二维二硫化钼薄膜弹性变形的非接触方法。利用脉冲激光加热，使二硫化钼薄膜的弯曲变形迅速增大。二硫化钼薄膜的弯曲角具有较高的稳定性，在没有外力作用的情况下，40天内弯曲角的变化仅为5%。然而，由于挥发性极性溶剂四氢呋喃（THF）的表面张力较低，二硫化钼薄膜的弯曲角明显减小。通过去除二硫化钼薄膜上的纳米牛顿尺度力，薄膜的弯曲角度在4分钟内显著增加，这一特性在微力传感器的制造中具有很大的应用潜力。这是第一次尝试用光学方法研究二维材料的力学性能。基于二硫化钼优异的弯曲性能，进一步利用工业生产的二硫化钼薄膜对微力进行定性检测，将大大降低微力传感器的生产成本。
A non-contact method for the observation of the elastic deformation of 2D molybdenum disulfide (MoS2) thin films using an ordinary optical microscope is reported. A pulsed laser is used to rapidly increase the bending deformation of the MoS2 thin films via heating. The bending angle of the MoS2 thin films shows high stability, changing only 5% in forty days without external forces. However, the bending angle of the MoS2 thin films substantially decreases after being wetted with the volatile polar solvent tetrahydrofuran (THF), because of its low surface tension. By removing the nano-Newton scale forces on the MoS2 thin films, the bending angle increases significantly within 4 minutes and this feature of the thin films shows great potential for use in the fabrication of micro-force sensors. This is the first attempt to study the mechanical properties of 2D materials by optical methods. Further utilization of industrially manufactured MoS2 thin films for detecting micro-force qualitatively on the basis of their excellent bending properties would significantly reduce the production costs of micro-force sensors.