柔性电子多尺度纳米银颗粒薄膜力学性能仿真  

Simulation on Mechanical Properties of Flexible Electronic Multi-Scale Silver Nanoparticles Film

作　　者：李超[1] 秦宗慧[1] 孙权[2] 陈建钧[1] 鹿业波[2] 汤成莉[2] LI Chao;QIN Zonghui;SUN Quan;CHEN Jianjun;LU Yebo;TANG Chengli(School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China;School of Mechanical and Electrical Engineering,Jiaxing University,Jiaxing 314001,Zhejiang,China)

机构地区：[1]华东理工大学机械与动力工程学院,上海200237 [2]嘉兴学院机电工程学院,浙江嘉兴314001

出　　处：《华东理工大学学报（自然科学版）》2021年第5期647-652,共6页Journal of East China University of Science and Technology

基　　金：浙江省自然科学基金(LQ19E050008)。

摘　　要：纳米银颗粒由于其优越的物理化学性能被广泛应用于柔性电子产品中,单一的纳米银颗粒烧结形成的薄膜因缺陷较多而面临诸多挑战。采用有限元对50 nm和10 nm两种大、小不同的银混合颗粒薄膜的力学性能进行了研究。模拟过程中将大颗粒之间的填充间距作为参数来表征大、小颗粒的混合质量比。仿真结果表明,当填充间距较小时,小颗粒作为填充区域受到的应力不均匀,容易发生裂纹;当填充间距过大时,填充区域孔隙的增加导致薄膜强度降低;混合模式下填充间距为50 nm时纳米银颗粒薄膜的力学性能更优越。Silver nanoparticles(AgNPs)are widely used in flexible electronic products for their superior physical and chemical properties.However,the thin films formed by sintering single-sized silver nanoparticles undergo many challenges due to their defects.The films formed by single small-sized AgNPs have high porosity,small grain size and many defects,while the ones formed by single large-sized AgNPs have larger grain size and less defects,but its sintering temperature and porosity are high.In this context,the mechanical properties of the films mixed with 10 nm and 50 nm AgNPs were investigated by finite element simulation to enhance the mechanical stabilities,service reliabilities and electrical conductivities of the sintered structure of AgNPs,in which the 10 nm AgNPs serve as the"filler"to increase the initial stacking density and weld the large AgNPs together,while the 50 nm AgNPs play as the framework to decrease the initial crystallographic defects and stabilize the sintered structures.In the simulation,the filling spacing between large nanoparticles is selected as a parameter to characterize the mixing ratio of large and small nanoparticles.Simulation results showed that when the spacing was short,the small particles were subjected to uneven stress in the filling area,and cracks were easy to occur.When the spacing was too long,the film strength decreased due to the increased number of pores.The results showed that the mechanical properties were superior when the spacing was 50 nm in mixed mode.

关 键 词：纳米银颗粒 多尺度 混合比 裂纹 孔隙 

分 类 号：TH114[机械工程—机械设计及理论]