Self-assembled triangular and labyrinth buckling patterns of thin films on spherical substrates |
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Authors: | Cao Guoxin Chen Xi Li Chaorong Ji Ailing Cao Zexian |
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Affiliation: | Department of Civil Engineering and Engineering Mechanics, Columbia University, New York, NY 10027-6699, USA. |
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Abstract: | We investigated the possibility of controlling thin film buckling patterns by varying the substrate curvature and the stress induced therein upon cooling. The numerical and experimental studies are based on a spherical Ag core/SiO(2) shell system. For Ag substrates with a relatively larger curvature, the dentlike triangular buckling pattern comes out when the film nominal stress exceeds a critical value. With increasing film stress and/or substrate radius, the labyrinthlike buckling pattern takes over. Both the buckling wavelength and the critical stress increase with the substrate radius. |
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