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Fabrication of graphene membranes and characterization of their mechanical strength

assignment

Fabrication of graphene membranes and characterization of their mechanical strength
Contact: Dr. Wesley van den Beld (w.t.e.vandenbeld@utwente.nl)

Introduction

Graphene is theoretically mechanically very strong and optically transparent material suited for fabricating freestanding conductive see-through membranes for numerous applications such as filtration, sensor and optic applications. However, graphene typically does not reach its theoretical achievable strength due to lattice defects (e.g. grain boundaries) caused by the polycrystalline nature of chemical vapour deposited (CVD) graphene. When the effect of defects to the graphene membrane strength is better understood, this could enable the application of stronger graphene devices in several applications such as EUV optics, see also: https://doi.org/10.3990/1.9789036546577 and https://doi.org/10.1117/12.2280560.

Assignment

  • Optimize the fabrication process of graphene membranes by a wet transfer method
  • Investigate the effect of graphene properties (thickness, defect density, etc.) to its membrane strength by bulge experiments of the fabricated graphene membranes
  • Literature study on the mechanical strength of graphene membranes as function of defects
  • Compose a project plan of the proposed research
  • Fabrication of graphene membranes using a graphene samples supplied by supervisor
  • Perform bulge experiments of the fabricated membranes to test their strength
  • Estimate mechanical properties (Ultimate Tensile Stress)
  • Write a concise report with the optimized protocol and findings

Source: https://doi.org/10.1117/12.2280560