Journal
ACS NANO
Volume 9, Issue 6, Pages 5799-5806Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.5b00335
Keywords
graphene; strain; strain-engineering; pseudomagnetic fields; Raman spectroscopy
Categories
Funding
- NSF-CMMI [1130364, 1434147]
- NSF-DMR [1124696]
- NSF [1069076, 1129826, 1362256]
- Clark School Future Faculty Program
- Graduate Dean's Dissertation Fellowship at the University of Maryland
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1124696] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1069076] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1129826, 1130364, 1362256, 1434147] Funding Source: National Science Foundation
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Strain can tune desirable electronic behavior in graphene, but there has been limited progress in controlling strain in graphene devices. In this paper, we study the mechanical response of graphene on substrates patterned with arrays of mesoscale pyramids. Using atomic force microscopy, we demonstrate that the morphology of graphene can be controlled from conformal to suspended depending on the arrangement of pyramids and the aspect ratio of the array. Nonuniform strains in graphene suspended across pyramids are revealed by Raman spectroscopy and supported by atomistic modeling, which also indicates strong pseudomagnetic fields in the graphene. Our results suggest that incorporating mesoscale pyramids in graphene devices is a viable route to achieving strain-engineering of graphene.
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