Nanoscale Physics and Device Laboratory, Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Science, Beijing 100190, China.
ACS Nano. 2011 May 24;5(5):3645-50. doi: 10.1021/nn103523t. Epub 2011 Apr 6.
In this study, we report a buckling approach for graphene and graphene ribbons on stretchable elastomeric substrates. Stretched polydimethylsiloxane (PDMS) films with different prestrains were used to receive the transferred graphene, and nanoscale periodical buckling of graphene was spontaneously formed after strain release. The morphology and periodicity of the as-formed graphene ripples are dependent strongly on their original shapes and substrates' prestrains. Regular periodicity of the ripples preferred to form for narrow graphene ribbons, and both the amplitude and periodicity are reduced with the increase of prestrain on PDMS. The graphene ripples have the ability to afford large strain deformation, thus making it ideal for flexible electronic applications. It was demonstrated that both graphene ribbon and nanographene film ripples could be used for strain sensors, and their resistance changes upon different strains were studied. This simple and controllable process of buckled graphene provides a feasible fabrication for graphene flexible electronic devices and strain sensors due to its novel mechanical and electrical properties.
在这项研究中，我们报告了一种在可拉伸弹性基底上构建石墨烯和石墨烯带的屈曲方法。使用具有不同预应变的拉伸聚二甲基硅氧烷 (PDMS) 薄膜来接收转移的石墨烯，应变释放后，石墨烯会自发形成纳米级周期性屈曲。所形成的石墨烯波纹的形态和周期性强烈依赖于它们的原始形状和基底的预应变。对于较窄的石墨烯带，更倾向于形成规则的周期性波纹，并且随着 PDMS 上预应变的增加，波纹的幅度和周期性都会降低。石墨烯波纹具有承受大应变变形的能力，因此非常适合用于柔性电子应用。研究表明，石墨烯带和纳米石墨烯薄膜波纹都可用于应变传感器，并且研究了它们在不同应变下的电阻变化。由于其新颖的机械和电气性能，这种简单可控的屈曲石墨烯工艺为石墨烯柔性电子设备和应变传感器的制造提供了一种可行的方法。
