Understanding the macroscopical flexibility/fragility of nanoporous Ag:Depending on network connectivity and micro-defects

• 作者: Chaoyang Wang Shengli Zhu Yanqin Liang Zhenduo Cui Shuilin Wu Chunling Qin Shuiyuan Luo Akihisa Inoue
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2020,（18）
• 页码范围: 91-101
• 页数: 11页
• 语种: 英文

摘要

The effective engineering applications of nanoporous metals (NPMs) in flexible energy storage and wear-able healthcare biosensor monitoring require its uniform ligaments network,specifically crack-free and flexible monolithic bodies.However,the macroscopic fragility of NPMs restricts their applications in wearable electronics fields.Here we focus on the synthetization of highly flexible NPMs.The effects of structural factors,e.g.ligament-network connectivity and micro-cracks on the mechanical properties of nanoporous Ag (np Ag) are investigated.The well-interconnected np Ag metal exhibits higher tensile strength,nanohardness and Vickers hardness than those for the ill-interconnected np Ag metal.The qual-ity of the network connectivity dominates the strength and hardness of the np Ag.The flexibility/fragility is determined by the micro-crack in np Ag.The crack-free np Ag exhibits good flexible behavior.When micro-cracks are introduced,the np Ag becomes fragile.The control of soft volume shrinkage rate (Vsr)and slow surface diffusivity (Ds) effectively suppresses the crack initiation and propagation of as-formed np Ag.These results provide useful insights to synthesize more flexible and crack-free NPM materials for effective use in public wearable electronics and diverse flexible engineering applications in the future.