Title

Mechanical Properties of Suspended Graphene Sheets

Document Type

Article

Department

Physics (Pomona)

Publication Date

12-11-2007

Keywords

atomic force microscopy, beams (structures), carbon, nanostructured materials, sheet materials, suspensions (mechanical components), thin films, Young's modulus

Abstract

Using an atomic force microscope, we measured effective spring constants of stacks of graphene sheets (less than 5) suspended over photolithographically defined trenches in silicon dioxide. Measurements were made on layered graphene sheets of thicknesses between 2 and 8 nm, with measured spring constants scaling as expected with the dimensions of the suspended section, ranging from 1 to 5 N/m. When our data are fitted to a model for doubly clamped beams under tension, we extract a Young’s modulus of 0.5 TPa, compared to 1 TPa for bulk graphite along the basal plane, and tensions on the order of 10−7 N.

Rights Information

© 2007 American Vacuum Society