Effects of lateral strain and corner geometry on self-rolling of nanomembranes

Abstract eng:
The present study, for the first time, systematically examined the role of lateral (thermal/lattice) mismatch strain on the self- rolling of nanomembranes. Employing (finite-element modeling) FEM simulations and analytical method, the root cause for the considerable discrepancy between theoretically predicted and experimentally measured curvatures is quantitatively clarified, and the significance of lateral strain to longitudinal/lateral rollup competition is demonstrated. A novel design strategy based on corner geometry engineering has been proposed to enhance the yield of unidirectional rollup, validated by FEM simulations.

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