Optimized MEMS-based tensile devices towards the generation of extreme strain in CVD graphene

Optimized MEMS-based tensile devices towards the generation of extreme strain in CVD graphene

Van Omme, J.T.

Wu, Y. (mentor)

Mechanical, Maritime and Materials Engineering

Precision and Microsystems Engineering

Micro and Nano Engineering

2016-02-25

Strain engineering of graphene has been predicted to change its chemical reactivity, thereby forming the basis for new applications, like hydrogen storage. Extreme strains of more than 10% are required for these applica- tions. However, experimental verification of theoretical predictions is still greatly lacking. Such high strains could simply not be controllably achieved. In our group, MEMS based tensile devices were developed to gen- erate large strain on graphene membranes. In this thesis, graphene grown by Chemical Vapor Deposition was transferred and clamped on these devices. In-situ Raman spectroscopy measurements were performed, while straining the material. Scanning Electron Microscope images proved that the fracture strain was ex- ceeded, rupturing the membrane. Nonetheless no Raman peak shift was observed, opposed to what was expected from the literature.

graphene
strain
CVD
Raman spectroscopy

http://resolver.tudelft.nl/uuid:c1e76f39-85a7-45b4-bc5d-0fdf84c3d187

Student theses

master thesis

(c) 2016 Van Omme, J.T.