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The mechanical characterization of stacked, multilayer graphene cantilevers and plates

Published online by Cambridge University Press:  17 March 2015

Emil J. Sandoz-Rosado ,
Joshua T. Smith ,
Satoshi Oida ,
Jingwei Bai  and
Eric D. Wetzel
Emil J. Sandoz-Rosado
Affiliation:
U.S. Army Research Laboratory, Materials and Manufacturing Sciences Division, APG, MD, 21005, U.S.A.
Joshua T. Smith
Affiliation:
IBM Watson Research Center, 1101 Kitchawan Rd., Yorktown Heights, NY 10598, U.S.A.
Satoshi Oida
Affiliation:
IBM Watson Research Center, 1101 Kitchawan Rd., Yorktown Heights, NY 10598, U.S.A.
Jingwei Bai
Affiliation:
IBM Watson Research Center, 1101 Kitchawan Rd., Yorktown Heights, NY 10598, U.S.A.
Eric D. Wetzel
Affiliation:
U.S. Army Research Laboratory, Materials and Manufacturing Sciences Division, APG, MD, 21005, U.S.A.
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Abstract

The mechanical properties of stacked graphene sheets with varying number of layers are examined. The stacked sheets are assembled by manually combining single layer CVD-grown graphene monolayers, resulting in a turbostratic multilayer graphene with irregular layer spacings greater than crystalline graphite. Due to the presence of multiple layers, the material is analyzed as a plate rather than a membrane. Bending stiffness is determined via the deflection of micron-scale cantilevers, prepared using focused ion beam milling, while in-plane tensile stiffness is characterized through center-loading of edge-supported circular specimens. Computational modeling and established analytical solutions are used to extract material and structural property information, and benchmark measured properties relative to complementary results from indentation tests. Stacked, few-layer CVD-grown graphene retains an in-plane elastic modulus of 350N/m/layer (corresponding to 1.04 TPa for an inter-layer spacing of 0.335nm), suggesting good load-sharing between stacked layers. Width-normalized bending stiffness was unmeasurable for cantilevers of 1 and 3 layers, while cantilevers of 5 and 10 layers had values of 11,100nN·nm and 1.3×106nN·nm respectively.

Keywords

nano-indentationnanostructureC
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1727: Symposium K – Graphene and Graphene Nanocomposites , 2015 , mrsf14-1727-k05-13
Copyright
Copyright © Materials Research Society 2015 

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References

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