Institute of Technical Physics and Materials Science, MFA, Research Centre for Natural Sciences, HAS, 1525 Budapest, , P.O. Box 49, Hungary.
Nanoscale. 2014 Jun 7;6(11):6030-6. doi: 10.1039/c3nr06885d. Epub 2014 Apr 29.
The electronic properties of graphene can be significantly influenced by mechanical strain. One practical approach to induce strain in graphene is to transfer atomically thin membranes onto pre-patterned substrates with specific corrugations. The possibility of using nanoparticles to impart extrinsic rippling to graphene has not been fully explored yet. Here we study the structure and elastic properties of graphene grown by chemical vapour deposition and transferred onto a continuous layer of SiO2 nanoparticles with diameters of around 25 nm, prepared on a Si substrate by the Langmuir-Blodgett technique. We show that the corrugation of the transferred graphene, and thus the membrane strain, can be modified by annealing at moderate temperatures. The membrane parts bridging the nanoparticles are suspended and can be reversibly lifted by the attractive forces between an atomic force microscope tip and graphene. This allows the dynamic control of the local morphology of graphene nanomembranes.
石墨烯的电子性质可以通过机械应变显著影响。一种在石墨烯中产生应变的实用方法是将原子级薄的膜转移到具有特定波纹的预图案化衬底上。使用纳米颗粒赋予石墨烯外在波纹的可能性尚未得到充分探索。在这里，我们研究了通过化学气相沉积生长并转移到由 Langmuir-Blodgett 技术在 Si 衬底上制备的直径约为 25nm 的连续 SiO2 纳米颗粒层上的石墨烯的结构和弹性性质。我们表明，转移石墨烯的波纹，即膜应变，可以通过在中等温度下退火来修饰。桥接纳米颗粒的膜部分被悬挂，并可以通过原子力显微镜尖端和石墨烯之间的吸引力可逆地提起。这允许对石墨烯纳米膜的局部形态进行动态控制。
