Achieving ultra-large tensile strain in nanoscale Si mechanical metamaterials

作     者：Yuheng Huang Kuibo Yin Zijian Gao Binghui Li Meng Nie Litao Sun 黄语恒;尹奎波;高子健;李炳辉;聂萌;孙立涛

作者机构：SEU-FEI Nano-Pico CenterKey Laboratory of MEMS of Ministry of EducationSoutheast UniversityNanjing 210096China 

基　　金：supported by the National Natural Science Foundation of China (62274031, 12174050, and 12234005) Jiangsu Provincial Natural Science Foundation of China (BK20231411) the Key Research and Development Program of Jiangsu Province (BE2021007-2) the New Cornerstone Science Foundation and XPLORER PRIZE 

出 版 物：《Science China Materials》 (中国科学（材料科学）（英文版）)

年 卷 期：2024年第67卷第12期

页      码：4040-4048页

摘      要：Compared with the inherent brittleness of bulk silicon(Si)at ambient temperature,the nanosized Si materials with very high strength,plasticity,and anelasticity due to size effect,are all ***,the ultimate stretchability of Si nanostructure has not yet been demonstrated due to the difficulties in experimental ***,directly performing in-situ tensile tests in a scanning electron microscope after developing a protocol for sample transfer,shaping and straining,we report the customized nanosized Si mechanical metamaterial which overcomes brittle limitations and achieves an ultra-large tensile strain of up to 95%using the maskless focused ion beam(FIB)*** unprecedented characteristic is achieved synergistically through FIB-induced size-softening effect and engineering modification of mechanical metamaterials,revealed through analyses of finite element analysis,atomic-scale transmission electron microscope characterization and molecular dynamics *** work is not only instructive for tailoring the strength and deformation behavior of nanosized Si mechanical metamaterials or other bulk materials,but also of practical relevance to the application of Si nanomaterials in nanoelectromechanical system and nanoscale strain engineering.

主 题 词：Si size effect mechanical metamaterial nanostructure tensile strain 

学科分类：081702[081702] 07[理学] 070205[070205] 08[工学] 0817[工学-轻工类] 080501[080501] 0805[工学-能源动力学] 0702[理学-物理学类] 

核心收录：

D　O　I：10.1007/s40843-024-3118-4

馆 藏 号：203155585...