支撑在软质基底上的石墨烯层的表面应力。
Surface stress of graphene layers supported on soft substrate.
作者信息
Du Feng, Huang Jianyong, Duan Huiling, Xiong Chunyang, Wang Jianxiang
机构信息
State Key Laboratory for Turbulence and Complex System, and Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, China.
Department of Biomedical Engineering, Duke University, Durham, NC, 27708, USA.
出版信息
Sci Rep. 2016 May 11;6:25653. doi: 10.1038/srep25653.
We obtain the surface stress of a single layer and multilayers of graphene supported on silicone substrates by measuring the deformation of the graphene-covered substrates induced by the surface tension of liquid droplets together with the Neumann's triangle concept. We find that the surface stress of the graphene-covered substrate is significant larger than that of the bare substrate, and it increases with increasing graphene layers, and finally reaches a constant value of about 120 mN/m on three and more layers of graphene. This work demonstrates that the apparent surface stress of graphene-substrate systems can be tuned by the substrate and the graphene layers. The surface stress and the tuning effect of the substrate on it may have applications in design and characterization of graphene-based ultra-sensitive sensors and other devices. Moreover, the method may also be used to measure the surface stress of other ultrathin films supported on soft substrates.
我们通过测量液滴表面张力引起的覆盖石墨烯的基底变形，并结合诺伊曼三角形概念，获得了支撑在硅酮基底上的单层和多层石墨烯的表面应力。我们发现，覆盖石墨烯的基底的表面应力明显大于裸基底的表面应力，并且随着石墨烯层数的增加而增大，在三层及更多层石墨烯上最终达到约120 mN/m的恒定值。这项工作表明，石墨烯-基底系统的表观表面应力可以通过基底和石墨烯层数进行调节。表面应力以及基底对其的调节作用可能在基于石墨烯的超灵敏传感器和其他器件的设计与表征中具有应用价值。此外，该方法还可用于测量支撑在软基底上的其他超薄膜的表面应力。
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