Design strategy of porous elastomer substrate and encapsulation forinorganic stretchableelectronics  

作　　者：Jiaxin Li Xianhong Meng Yunfei Shen Junlin Gu Guoquan Luo Ke Bai Hailong Li Zhaoguo Xue 

机构地区：[1]National Key Laboratory of Strength and Structural Integrity,Institute of Solid Mechanics,School of Aeronautic Science and Engineering,Beihang University,Beijing,P.R.China [2]Applied Mechanics Laboratory,Department of Engineering Mechanics,Tsinghua University,Beijing,P.R.China

出　　处：《International Journal of Smart and Nano Materials》2024年第2期330-347,共18页国际智能和纳米材料杂志（英文）

基　　金：support from the National Natural Science Foundation of China (Grant No.12172027);the Fundamental Research Funds for the Central Universities.X.M.acknowledges support from the National Natural Science Foundation of China (Grant Nos.12272023 and U23A20111)。

摘　　要：The emergence of stretchable electronic technology has led to the development of many industries and facilitated many unprecedented applications,owing to its ability to bear var-ious deformations.However,conventional solid elastomer sub-strates and encapsulation can severely restrict the free motion and deformation of patterned interconnects,leading to poten-tial mechanical failures and electrical breakdowns.To address this issue,we propose a design strategy of porous elastomer substrate and encapsulation to improve the stretchability of serpentine interconnects in island-bridge structures.The ser-pentine interconnects are fully bonded to the elastomer sub-strate,while segments above circular pores remain suspended,allowing for free deformation and a substantial improvement in elastic stretchability compared to the solid substrates.The pores ensure unimpeded interconnect deformations,and mod-erate porosity provides support while maintaining the initial planar state.Compared to conventional solid configurations,finite element analysis(FEA)demonstrates a substantial enhancement of elastic stretchability(e.g.=9 times without encapsulation and=7 times with encapsulation).Uniaxial cyc-lic loading fatigue experiments validate the enhanced elastic stretchability,indicating the mechanical stability of the porous design.With its intrinsic advantages in permeability,the pro-posed strategy has the potential to offer insightful inspiration and novel concepts for advancing the field of stretchable inorganic electronics.

关 键 词：Stretchable inorganic electronics Island-bridge structures porous elastomer substrate encapsulation design serpentine interconnects 

分 类 号：O34[理学—固体力学]