The princess and the pea at the nanoscale: Wrinkling and delamination of graphene on nanoparticles
The princess and the pea at the nanoscale: Wrinkling and delamination of graphene on nanoparticles
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DOI：
10.1103/physrevx.2.041018
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发表时间：
2012-01
影响因子：
12.5
通讯作者：
Mahito Yamamoto;O. Pierre-Louis;Jia Huang;M. Fuhrer;T. Einstein;W. Cullen
中科院分区：
文献类型：
--
作者：
Mahito Yamamoto;O. Pierre-Louis;Jia Huang;M. Fuhrer;T. Einstein;W. Cullen
薄膜对外力或几何约束表现出复杂的响应。一个熟悉的例子是人类皮肤、植物叶子和织物所表现出的褶皱，这是由于弯曲与拉伸相对容易造成的。在这里，我们研究了石墨烯，已知最薄和最硬的膜，沉积在用二氧化硅纳米颗粒装饰的二氧化硅衬底上的褶皱。在小的纳米颗粒密度下，单层石墨烯附着在衬底上，仅在纳米颗粒周围的小区域分离。随着纳米颗粒密度的增加，我们观察到连接纳米颗粒的褶皱的形成。当纳米颗粒密度超过临界时，这些褶皱会在样品中形成一个渗透网络。随着石墨烯膜变得更厚，可以观察到从衬底的整体分层。这些观察结果可以在连续弹性模型中很好地理解，并且对石墨烯的电子特性的应变工程具有重要意义。
Thin membranes exhibit complex responses to external forces or geometrical constraints. A familiar example is the wrinkling, exhibited by human skin, plant leaves, and fabrics, resulting from the relative ease of bending versus stretching. Here, we study the wrinkling of graphene, the thinnest and stiffest known membrane, deposited on a silica substrate decorated with silica nanoparticles. At small nanoparticle density monolayer graphene adheres to the substrate, detached only in small regions around the nanoparticles. With increasing nanoparticle density, we observe the formation of wrinkles which connect nanoparticles. Above a critical nanoparticle density, the wrinkles form a percolating network through the sample. As the graphene membrane is made thicker, global delamination from the substrate is observed. The observations can be well understood within a continuum elastic model and have important implications for strain-engineering the electronic properties of graphene.