Journal
NANO LETTERS
Volume 11, Issue 1, Pages 236-240Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl103623e
Keywords
Rolled-up nanotechnology; nanomembranes; micro- and nanotube; carbon nanoscrolls; graphene
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Funding
- Volkswagen Foundation [I/84 072]
- U.S. Air Force Office of Scientific Research [FA9550-09-1-0550]
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We investigate the relaxation of rectangular wrinkled thin films intrinsically containing an initial strain gradient. A preferential rolling direction, depending on wrinkle geometry and strain gradient, is theoretically predicted and experimentally verified. In contrast to typical rolled-up nanomembranes, which bend perpendicular to the longer edge of rectangular patterns, we find a regime where rolling parallel to the longer edge of the wrinkled film is favorable. A nonuniform radius of the rolled-up film is well reproduced by elasticity theory and simulations of the film relaxation using a finite element method.
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