Self-assembled triangular and labyrinth buckling patterns of thin films on spherical substrates
Self-assembled triangular and labyrinth buckling patterns of thin films on spherical substrates
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DOI：
10.1103/physrevlett.100.036102
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发表时间：
2008-01-25
影响因子：
8.6
通讯作者：
Cao, Zexian
中科院分区：
文献类型：
--
作者：
Cao, Guoxin;Chen, Xi;Cao, Zexian
我们研究了通过改变基底曲率以及冷却时在其中产生的应力来控制薄膜屈曲模式的可能性。数值和实验研究基于球形银核/二氧化硅壳层体系。对于曲率相对较大的银基底，当薄膜名义应力超过临界值时，会出现凹坑状三角形屈曲模式。随着薄膜应力和/或基底半径的增加，迷宫状屈曲模式会取而代之。屈曲波长和临界应力都随基底半径的增加而增大。
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.