Abstract
A method for fabricating multiple free-standing structures on the same sheet of graphene is demonstrated. Mechanically exfoliated mono- and bilayer graphene sheets were sandwiched between two layers of polymethyl-methacrylate. Suspended areas were defined by e-beam exposure allowing precise control over their shape and position. Mechanical characterization of suspended graphene sheets was performed by nanoindentation with an atomic force microscopy tip. The obtained built-in tensions of 12 nN are significantly lower than those in suspended graphene exfoliated on an SiO2 substrate, and therefore permit access to the intrinsic properties of this material system.
Highlights
SiO2 Si graphene deposited on PMMA exhibited a thickness of ∼1.6 nm
Exfoliated mono- and bilayer graphene sheets were sandwiched between two layers of polymethylmethacrylate
Mechanical characterization of suspended graphene sheets was performed by nanoindentation with an atomic force microscopy tip
Summary
SiO2 Si graphene deposited on PMMA exhibited a thickness of ∼1.6 nm. In the second step, the second PMMA layer was spin coated on the top (figure 1(b)). A method for fabricating multiple free-standing structures on the same sheet of graphene is demonstrated. Exfoliated mono- and bilayer graphene sheets were sandwiched between two layers of polymethylmethacrylate. Suspended areas were defined by e-beam exposure allowing precise control over their shape and position.
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