Adhesion of graphene sheet on nano-patterned substrates with nano-pillar array
Adhesion of graphene sheet on nano-patterned substrates with nano-pillar array
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DOI：
10.1063/1.4811718
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发表时间：
2013-06
影响因子：
3.2
通讯作者：
Guangxu Li;C. Yilmaz;Xiaohong An;S. Somu;S. Kar;Y. Jung;A. Busnaina;K. Wan
中科院分区：
文献类型：
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作者：
Guangxu Li;C. Yilmaz;Xiaohong An;S. Somu;S. Kar;Y. Jung;A. Busnaina;K. Wan
在将化学气相沉积的石墨烯转移到衬底之前，在硅上制造金纳米柱阵列。内在的表面间吸引力将单层拉成紧密接触，符合基底几何形状，但支柱支撑圆形气泡阵列。建立了一个简单的脱层力学模型，提取材料和界面性质。通过测量气泡尺寸，发现石墨烯-金界面粘附能为γ = 450 ± 100 mJ m−2。如果柱高度与柱间间隔的比率福尔斯在石墨烯弹性模量E和厚度h的情况下低于（γ/Eh）1/4，则气泡保持隔离;否则，相邻的气泡聚结。石墨烯器件的关键设计准则。
An array of gold nano-pillars is fabricated on silicon, before chemical vapor deposited graphene is transferred to the substrate. Intrinsic intersurface attraction pulls the monolayer into intimate contact conforming to the substrate geometry, but the pillars support an array of circular blisters. A simple delamination mechanics model is constructed to extract the materials and interface properties. The graphene-gold interfacial adhesion energy is found to be γ = 450 ± 100 mJ m−2 by measuring the blister dimension. Should the ratio of pillar height to inter-pillar separation falls short of (γ/Eh)1/4 with graphene elastic modulus, E and thickness, h, the blisters stay isolated; otherwise, adjacent blisters coalesce. Critical design guidelines are set for graphene devices.