期刊
NANO LETTERS
卷 11, 期 11, 页码 4748-4752出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl202562u
关键词
Graphene; bimetallic; cantilevers; strain; thermal expansion; interfacial shear strength
类别
资金
- Oak Ridge National Laboratory by the Office of Basic Energy Sciences, U.S. Department of Energy
- NSF [DMR-1056859, EPS-1004083]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1056859] Funding Source: National Science Foundation
The remarkable mechanical properties of graphene, the thinnest, lightest, and strongest material in existence, are desirable in applications ranging from composite materials to sensors and actuators. Here, we demonstrate that these mechanical properties are strongly affected by the interaction with the substrate onto which graphene is deposited. By measuring the temperature-dependent deflection of graphene/substrate bimetallic cantilevers we determine strain, thermal expansion coefficient, and the adhesion force acting on graphene films attached to a substrate. Graphene deposited on silicon nitride (SiNx) is under much larger strain, epsilon(g) similar to 1.5 x 10(-2), compared to graphene on gold (Au), epsilon(g) < 10(-3). The thermal expansion coefficient alpha(g) of graphene attached to SiNx is found to be negative, in the range from (- 5... - 1) x 10(-6)K(-1) and smaller in magnitude than alpha(g) of suspended graphene. We also estimate the interfacial shear strength of the graphene/SiNx interface to be similar to 1 GPa at room temperature.
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