TY  - JOUR
AU  - Goldsche, Matthias
AU  - Sonntag, Jens
AU  - Khodkov, Tymofiy
AU  - Verbiest, Gerard Jan
AU  - Reichardt, Sven
AU  - Neumann, Christoph
AU  - Ouaj, Taoufiq
AU  - von den Driesch, Nils
AU  - Buca, Dan Mihai
AU  - Stampfer, Christoph
TI  - Tailoring Mechanically Tunable Strain Fields in Graphene
JO  - Nano letters
VL  - 18
IS  - 3
SN  - 1530-6992
CY  - Washington, DC
PB  - ACS Publ.
M1  - FZJ-2018-03831
SP  - 1707 - 1713
PY  - 2018
AB  - There are a number of theoretical proposals based on strain engineering of graphene and other two-dimensional materials, however purely mechanical control of strain fields in these systems has remained a major challenge. The two approaches mostly used so far either couple the electrical and mechanical properties of the system simultaneously or introduce some unwanted disturbances due to the substrate. Here, we report on silicon micromachined comb-drive actuators to controllably and reproducibly induce strain in a suspended graphene sheet in an entirely mechanical way. We use spatially resolved confocal Raman spectroscopy to quantify the induced strain, and we show that different strain fields can be obtained by engineering the clamping geometry, including tunable strain gradients of up to 1.4%/μm. Our approach also allows for multiple axis straining and is equally applicable to other two-dimensional materials, opening the door to investigating their mechanical and electromechanical properties. Our measurements also clearly identify defects at the edges of a graphene sheet as being weak spots responsible for its mechanical failure.
LB  - PUB:(DE-HGF)16
C6  - pmid:29425440
UR  - <Go to ISI:>//WOS:000427910600020
DO  - DOI:10.1021/acs.nanolett.7b04774
UR  - https://juser.fz-juelich.de/record/849695
ER  -