Controlled mechanical assembly of complex 3D mesostructures and strain sensors by tensile buckling  

作　　者：Xiaogang Guo Xueju Wang Dapeng Ou Jilong Ye Wenbo Pang Yonggang Huang John A.Rogers Yihui Zhang 

机构地区：[1]Department of Engineering Mechanics,Center for Mechanics and Materials and Center for Flexible Electronics Technology,AML,Tsinghua University,100084 Beijing,People’s Republic of China [2]Department of Materials Science and Engineering,Northwestern University,Evanston,IL 60208,USA [3]State Key Laboratory of Tribology,Tsinghua University,100084 Beijing People’s Republic of China [4]Center for Nano and Micro Mechanics,Tsinghua University,100084 Beijing People’s Republic of China [5]Departments of Civil and Environmental Engineering,Mechanical Engineering,and Materials Science and Engineering,Northwestern University,Evanston,IL 60208,USA [6]Departments of Materials Science and Engineering,Biomedical Engineering,Neurological Surgery,Chemistry,Mechanical Engineering,Electrical Engineering and Computer Science,Center for Bio-Integrated Electronics,Simpson Querrey Institute for BioNanotechnology,Northwestern University,Evanston,IL 60208,USA

出　　处：《npj Flexible Electronics》2018年第1期120-126,共7页npj-柔性电子（英文）

基　　金：Y.Z.acknowledges support from the National Natural Science Foundation of China(#11672152 and#11722217);the Thousand Young Talents Program of China,and the Tsinghua National Laboratory for Information Science and Technology;Y.H.acknowledges the support from the NSF(#CMMI1400169,#CMMI1534120,and#CMMI1635443).

摘　　要：Recent research establishes methods of controlled mechanical assembly as versatile routes to three-dimensional(3D)mesostructures from patterned 2D films,with demonstrated applicability to a broad range of materials(e.g.,semiconductors,polymers,metals,and their combinations)and length scales(e.g.,from sub-microscale to centimeter scale).Previously reported schemes use pre-stretched elastomeric substrates as assembly platforms to induce compressive buckling of 2D precursor structures,thereby enabling their controlled transformation into 3D architectures.Here,we introduce tensile buckling as a different,complementary strategy that bypasses the need for a pre-stretched platform,thereby simplifying the assembly process and opening routes to additional classes of 3D geometries unobtainable with compressive buckling.A few basic principles in mechanics serve as guidelines for the design of 2D precursor structures that achieve large out-of-plane motions and associated 3D transformations due to tensile buckling.Experimental and computational studies of nearly 20 examples demonstrate the utility of this approach in the assembly of complex 3D mesostructures with characteristic dimensions from micron to millimeter scales.The results also establish the use of nonlinear mechanics modeling as a mechanism for designing systems that yield desired 3D geometries.A strain sensor that offers visible readout and large detectable strain range through a collection of mechanically triggered electrical switches and LEDs serves as an application example.

关 键 词：STRAIN BUCKLING thereby 

分 类 号：TG1[金属学及工艺—金属学]