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Published on: July 24, 2015
Bending properties of single functionalized graphene sheets probed by atomic force microscopy.
Hannes C Schniepp1, Konstantin N Kudin, Je-Luen Li
1Department of Chemical Engineering, Princeton University, Princeton, NJ 08544, USA.
ACS Nano
|February 12, 2009
Summary
Functionalized graphene sheets exhibit reversible folding along pre-existing defect lines when probed by an atomic force microscope. This indicates that kinks and functional groups dictate the bending behavior of graphene.
Area of Science:
- Materials Science
- Nanotechnology
- Surface Science
Background:
- Graphene sheets possess unique mechanical properties.
- Understanding the bending behavior of functionalized graphene is crucial for nanoscale device applications.
Purpose of the Study:
- To investigate the bending and folding characteristics of functionalized graphene sheets.
- To identify the dominant factors governing the mechanical response of graphene.
Main Methods:
- Utilized atomic force microscopy (AFM) to probe individual functionalized graphene sheets.
- Applied controlled force with the AFM tip to induce bending and folding.
- Observed and analyzed the reversible folding and unfolding behavior.
Main Results:
- Individual graphene sheets were successfully transformed from a flat to a folded configuration.
- Sheets demonstrated reversible folding and unfolding capabilities over multiple cycles.
- Folding consistently occurred at the same specific locations on the sheets.
Conclusions:
- The folding behavior of functionalized graphene is primarily dictated by pre-existing kink lines.
- These kink lines are likely composed of defects and/or functional groups on the graphene sheet.
- This finding has implications for designing and controlling nanostructures and devices based on graphene.
