摘要
利用有限元分析法对镶嵌在Lu2O3薄膜中的Au、Cu、Pt、Co金属纳米颗粒的应变场分布进行分析.分析表明:金属纳米颗粒在生长过程中受Lu2O3薄膜的压缩应力作用,从而在纳米颗粒内部和表面产生相应应变,应变分布与金属纳米颗粒的杨氏模量和泊松比有关.杨氏模量大的金属纳米颗粒表面应变和内部应变差异较大;而杨氏模量小的金属纳米颗粒内外应变差相对较小.随着金属纳米颗粒在基体材料内部不断生长,其受到的偏应变也逐渐增大.金属纳米颗粒生长过程中的这种偏应变的存在和变化将极大地影响其内部晶格结构和表面形貌,进而影响金属纳米颗粒的性能.
The strain distributions of Au, Cu, Pt and Co nanoparticles embedded in Lu2O3 matrix were investigated by the finite-element calculations. The simulation results indicated that all of metal nanoparticles incure compressive stress by the Lu2O3 matrix, which thus result in the corresponding strain in the center and at the surface of nanoparticles. The strain distributions are closely related to the Young's modulus and poisson's ratio of metal nanoparticles and matrix. For the metal nanoparticle with bigger Youngrs modulus, the difference between the strain in the center and that at the surface of the nanoparticles is largerer. While, for the metal nanoparticle with smaller Younffs modulus, the difference between the strainat the surface and that in the center of the nanoparticles is smaller. Meanwhile, with the growth of metal nanoparticles, the deviator strain also increase. This net deviatoric strain distribution may also have a significant influence on the morphology and microstructure of metalnanoparticles, and thus the physical properties of metal nanoparticles.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2014年第6期63-67,共5页
Acta Photonica Sinica
基金
国家自然科学基金(Nos.11164008
11004087)
江西省教育厅科技项目(No.GJJ13210)
江西省光电子与通信重点实验室开放基金(No.201101)
江西师范大学博士启动基金(No.4029)资助
关键词
纳米颗粒
薄膜
有限元方法
压缩应力
应变
Nanoparticles
Thin films
Finite-element method
Compressive stress
Strain