2017/11/13 by M. Goldsche, Matthias Goldsche, J. Sonntag +17 · 73 citations
Engineering · Materials Science · Physics and Astronomy · #Carbon Nanotubes in Composites #Graphene #Graphene and Nanomaterials Applications #Graphene research and applications #Materials science #Nanotechnology #Optoelectronics #Strain (injury) #cond-mat.mes-hall #cond-mat.mtrl-sci #physics.app-ph
paper · pdf · doi:10.1021/acs.nanolett.7b04774
published in Nano Letters 18(3), 1707-1713 (American Chemical Society) · Keywords: Graphene, MEMS, Raman spectroscopy, strain engineering, pseudomagnetic field
arxiv created 2017/11/13 · openalex publication_date 2018/02/09 · arxiv updated 2018/04/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.