多尺度纳米颗粒银导线力学行为仿真研究

Simulation on mechanical behavior of silver wire composed by multi-scale nanoparticles

摘要

基于纳米颗粒型导电银墨水打印的柔性互连导线作为柔性电子器件的重要组成部分，研究其微观结构对力学行为的影响方式，对提升柔性电子产品的服役可靠性具有重要意义。采用随机圆形堆积算法对纳米颗粒型银导线的微观结构进行二维有限元建模，并采用内聚力模型对颗粒间的结合力进行描述。研究了以不同平均粒径（30～80 nm）、标准差（0～45 nm）和孔隙率组成的微观结构对银导线在拉伸过程中力学性能的影响。结果表明粒径的标准差是影响银导线孔隙率的主要因素，且纳米颗粒银导线的力学性能随其微观孔隙率的减小而有明显提升。进一步分析了粒径以双峰正态分布规律的银导线中，小颗粒的平均粒径和所占比例对银导线力学行为的影响。结果表明由于小颗粒的平均粒径较小，可以较好地嵌入到大颗粒堆积的间隙中，使银导线孔隙率降低，力学性能明显提升。

Abstract

The flexible interconnecting wires printed by nanoparticle conductive silver ink are an important component of flexible electronic devices. Studying the influence of their microstructure on mechanical behavior is of great significance for improving the service reliability of flexible electronic products. The two-dimensional finite element model of the microstructure of nanoparticle silver wire was carried out based on the random circular stacking algorithm, and the bonding force between the particles was modeled by cohesive zone model. The effect of microstructure composed of particles with different average particle sizes (30-80 nm), standard deviations (0-45 nm), and porosity on the mechanical properties of silver wires during stretching was studied. The results indicate that the standard deviation of particle size is the main factor affecting the porosity of silver wires, and the mechanical properties of nanoparticle silver wires significantly improve with the decrease of their micro porosity. In addition, the wire composed of particles with bimodal normal distribution was modeled, and the impact of the average particle size and proportion of the small particles on the mechanical behavior of silver wires were analyzed. The results show that particles with smaller average size can be well embedded in the gaps of large particles, which can lead to the reducing of porosity of the silver wires, and significantly improving their mechanical properties.

关键词

打印银导线 / 纳米颗粒 / 内聚力模型 / 孔隙率 / 力学行为

Key words

printed silver wire / nanoparticles / cohesive zone model / porosity / mechanical behavior

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基金资助

国家自然科学基金资助项目(52005219)

国家自然科学基金资助项目(62374074)