Graphene bimetallic-like cantilevers: Probing graphene/substrate interactions

Hiram Conley; Nickolay V. Lavrik; Dhiraj Prasai; Kirill I. Bolotin

doi:10.1021/nl202562u

Graphene bimetallic-like cantilevers: Probing graphene/substrate interactions

Hiram Conley, Nickolay V. Lavrik, Dhiraj Prasai, Kirill I. Bolotin

Nanofabrication Research Laboratory

Research output: Contribution to journal › Article › peer-review

55 Scopus citations

Abstract

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 (SiN_x) is under much larger strain, ε_g ∼1.5 ×10^-2, compared to graphene on gold (Au), ε_g < 10^-3. The thermal expansion coefficient α_g of graphene attached to SiN_x is found to be negative, in the range from (- 5⋯ - 1) ×10 ^-6K^-1 and smaller in magnitude than α_g of suspended graphene. We also estimate the interfacial shear strength of the graphene/SiN_x interface to be ∼1 GPa at room temperature.

Original language	English
Pages (from-to)	4748-4752
Number of pages	5
Journal	Nano Letters
Volume	11
Issue number	11
DOIs	https://doi.org/10.1021/nl202562u
State	Published - Nov 9 2011

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AU - Lavrik, Nickolay V.

AU - Prasai, Dhiraj

AU - Bolotin, Kirill I.

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AB - 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, εg ∼1.5 ×10-2, compared to graphene on gold (Au), εg < 10-3. The thermal expansion coefficient αg of graphene attached to SiNx is found to be negative, in the range from (- 5⋯ - 1) ×10 -6K-1 and smaller in magnitude than αg of suspended graphene. We also estimate the interfacial shear strength of the graphene/SiNx interface to be ∼1 GPa at room temperature.

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Graphene bimetallic-like cantilevers: Probing graphene/substrate interactions

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