期刊
ACS NANO
卷 10, 期 3, 页码 3801-3808出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b00509
关键词
surface patterns; free-standing polypyrrole; mechanical properties; surface wrinkling
类别
资金
- Natural Science Foundation of China [21374076, 21574099]
- Tianjin Research Program of Application Foundation and Advanced Technology [13JCYBJC17100]
- NSFC [11172155, 11572179]
Mechanical instability has been shown to play an important role in the formation of wrinkle structures in biofilms, which not only can adopt instability modes as templates to regulate their 3D architectures but also can tune internal stresses to achieve stable patterns. Inspired by nature, we report a mechanical chemical coupling method to fabricate freestanding conducting films with instability-driven hierarchical micro/nanostructured patterns. When polypyrrole (PPy) film is grown on an elastic substrate via chemical oxidation polymerization, differential growth along with in situ self -reinforcing effect induces stable wrinkle patterns with different scales of wavelengths. The self -reinforcing effect modifies the internal stresses, hence PPy films with intact wrinkles can be removed from substrates and further transferred onto target substrates for functional device fabrication. To understand the buckling mechanics, we construct a model which reveals the formation of hierarchical wrinkle patterns.
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