Stretch-Induced Stiffness Enhancement of Graphene Grown by Chemical Vapor Deposition
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- 作者：Qing-Yuan Lin ; Guangyin Jing ; Yang-Bo Zhou ; Yi-Fan Wang ; Jie Meng ; Ya-Qing Bie ; Da-Peng Yu ; Zhi-Min Liao
- 刊名：ACS Nano
- 出版年：2013
- 出版时间：February 26, 2013
- 年：2013
- 卷：7
- 期：2
- 页码：1171-1177
- 全文大小：474K
- 年卷期：v.7,no.2(February 26, 2013)
- ISSN：1936-086X
文摘
The mechanical properties of ultrathin membranes have attracted considerable attention recently. Nanoindentation based on atomic force microscopy is commonly employed to study mechanical properties. We find that the data processing procedures in previous studies are nice approximations, but it is difficult for them to illustrate the mechanical properties precisely. Accordingly, we develop a revised numerical method to describe the force curve properly, by which the intrinsic mechanical properties of these membranes can be acquired. Combining the nanoindentation measurements with the revised numerical method, we demonstrate that loading鈥搖nloading cycles under large load can lead to a pronounced improvement in stiffness of graphene grown by chemical vapor deposition (CVD). The Young鈥檚 moduli of the stretched CVD graphene membranes can be improved to 1 TPa, closing to the value of the pristine graphene. Our findings demonstrate a possible way to recover the exceptional elastic properties of CVD graphene from the softened stiffness caused by wrinkles.