Tunable Formation of Ordered Wrinkles in Metal Films with Controlled Thickness Gradients Deposited on Soft Elastic Substrates

被引:72
|
作者
Yu, Senjiang [1 ]
Ni, Yong [2 ,3 ]
He, Linghui [2 ,3 ]
Ye, Quan-Lin [4 ]
机构
[1] China Jiliang Univ, Dept Phys, Hangzhou 310018, Zhejiang, Peoples R China
[2] Univ Sci & Technol China, Dept Modern Mech, CAS Key Lab Mech Behav & Design Mat, Hefei 230026, Anhui, Peoples R China
[3] Univ Sci & Technol China, Collaborat Innovat Ctr Suzhou Nano Sci & Technol, Hefei 230026, Anhui, Peoples R China
[4] Hangzhou Normal Univ, Hangzhou Key Lab Quantum Matter, Dept Phys, Hangzhou 310036, Zhejiang, Peoples R China
基金
中国国家自然科学基金;
关键词
buckling instability; pattern formation; wrinkle; thickness gradient; thin firms; THIN-FILMS; COMPLIANT SUBSTRATE; ELASTOMERIC POLYMER; SURFACE WRINKLES; PATTERNS; MECHANICS; MICROSTRUCTURES; DELAMINATION; DEFORMATION; TOPOLOGIES;
D O I
10.1021/am507450x
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Controlled wrinkled surface is useful for a wide range of applications, including flexible electronics, smart adhesion, wettability, stamping, sensoring, coating, and measuring. In this work, thickness-gradient-guided spontaneous formation of ordered wrinkling patterns in metal films deposited on soft elastic substrates is revealed by atomic force microscopy, theoretic analysis, and simulation. It is observed that in the thicker film region, broad cracks form, and the film surface remains flat. In the thinner film region, the cracks attenuate along the direction of the thickness decrease, and various wrinkle patterns including branched stripes, herringbones, and labyrinths can coexist. The interplay between the residual compression and the thickness gradient leading to the formation of such wrinkling patterns is discussed based on a nonlinear wrinkling model. The simulated wrinkling patterns as well as the variation trends of the wrinkle wavelength and amplitude along the gradient direction are in good agreement with the experimental observations. The report in this work could promote better understanding and fabrication of such ordered wrinkling patterns by tunable thickness gradient.
引用
收藏
页码:5160 / 5167
页数:8
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