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Deformation of Wrinkled Graphene
ACS Nano ( IF 15.8 ) Pub Date : 2015-03-20 00:00:00 , DOI: 10.1021/nn507202c
Zheling Li , Ian A. Kinloch , Robert J. Young , Kostya S. Novoselov , George Anagnostopoulos 1 , John Parthenios 1 , Costas Galiotis 1 , Konstantinos Papagelis 1 , Ching-Yu Lu , Liam Britnell
Affiliation  

The deformation of monolayer graphene, produced by chemical vapor deposition (CVD), on a polyester film substrate has been investigated through the use of Raman spectroscopy. It has been found that the microstructure of the CVD graphene consists of a hexagonal array of islands of flat monolayer graphene separated by wrinkled material. During deformation, it was found that the rate of shift of the Raman 2D band wavenumber per unit strain was less than 25% of that of flat flakes of mechanically exfoliated graphene, whereas the rate of band broadening per unit strain was about 75% of that of the exfoliated material. This unusual deformation behavior has been modeled in terms of mechanically isolated graphene islands separated by the graphene wrinkles, with the strain distribution in each graphene island determined using shear lag analysis. The effect of the size and position of the Raman laser beam spot has also been incorporated in the model. The predictions fit well with the behavior observed experimentally for the Raman band shifts and broadening of the wrinkled CVD graphene. The effect of wrinkles upon the efficiency of graphene to reinforce nanocomposites is also discussed.

中文翻译:

皱纹石墨烯的变形

已经通过使用拉曼光谱研究了通过化学气相沉积(CVD)在聚酯膜基材上产生的单层石墨烯的变形。已经发现,CVD石墨烯的微结构由被起皱的材料隔开的平坦的单层石墨烯的岛的六边形阵列组成。在变形过程中,发现每单位应变的拉曼二维带波数的位移率小于机械剥落石墨烯扁平薄片的位移率的25%,而每单位应变的带展宽率约为其的75%。脱落的材料。这种不寻常的变形行为已通过机械隔离的石墨烯岛(由石墨烯皱纹分隔)进行了建模,每个石墨烯岛中的应变分布均使用剪切滞后分析确定。拉曼激光束光斑的大小和位置的影响也已纳入模型中。该预测与实验观察到的拉曼能带移动和起皱的CVD石墨烯变宽的行为非常吻合。还讨论了皱纹对石墨烯增强纳米复合材料效率的影响。
更新日期:2015-03-20
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