复合结构纳米颗粒的设计与合成
发布时间：2018-08-26 16:17
【摘要】：最近,复合纳米颗粒由于其独特的物理和化学性质而引起了人们广泛的关注。研究复合纳米颗粒微观结构与其相关的物理和化学性质之间的关系是至关重要的。本论文中,首先系统地研究了Ge/GeO_2核/壳纳米颗粒的应变场分布与其生长环境之间的相互作用。另外,我们使用改进的脉冲激光沉积法结合快速退火技术一步合成了高密度的Au-Ag合金纳米颗粒。具体工作如下:1、通过生长环境调控Ge/GeO_2核/壳纳米颗粒的应变场分布,利用有限元的方法模拟了Ge/GeO_2核/壳纳米颗粒埋嵌在Al2O_3、Lu2O_3和SiO_2过程中的应变场分布,模拟结果显示了Ge核和GeO_2壳的应变强烈的依赖于其生长环境,另外,我们发现了在生长的过程中,Ge核受到了拉伸应变到压缩应变的转变,以及应变的转变点与周围基体材料的杨氏模量十分密切相关。模拟结果表明了可以通过改变周围基体材料来调控Ge/GeO_2核/壳纳米颗粒的应变场分布,从而改变Ge/GeO_2核/壳纳米颗粒的表面态和光学性能。2、使用PLD方法制备了埋嵌在Al2O_3基体材料中的Au-Ag合金纳米颗粒。HRTEM和XPS分析清楚地表明,在绝缘Al2O_3基体材料中制备出了Au、Ag含量约为1:1的Au-Ag合金。值得注意的是,Au-Ag合金纳米颗粒表现出不同的光致发光谱。这些发现提供了一种有用的方法来合成金属合金纳米颗粒,并利用在光电子器件中。
[Abstract]:Recently, composite nanoparticles have attracted wide attention due to their unique physical and chemical properties. It is important to study the relationship between the microstructure of composite nanoparticles and their related physical and chemical properties. In this thesis, the interaction between the strain field distribution of Ge/GeO_2 core / shell nanoparticles and their growth environment is studied systematically. In addition, high density Au-Ag alloy nanoparticles were synthesized by improved pulsed laser deposition and rapid annealing. The specific work is as follows: 1. The strain field distribution of Ge/GeO_2 core / shell nanoparticles is regulated by growth environment, and the strain field distribution of Ge/GeO_2 core / shell nanoparticles embedded in Al2O_3,Lu2O_3 and SiO_2 process is simulated by finite element method. The simulation results show that the strain of the Ge core and the GeO_2 shell are strongly dependent on the growth environment. In addition, we find that the GE core is transformed from the tensile strain to the compression strain during the growth process. And the strain transition point is closely related to the Young's modulus of the surrounding matrix material. The simulation results show that the strain field distribution of Ge/GeO_2 core / shell nanoparticles can be regulated by changing the surrounding matrix material. In order to change the surface state and optical properties of Ge/GeO_2 core / shell nanoparticles, Au-Ag alloy nanoparticles embedded in Al2O_3 matrix were prepared by PLD method. The Au-Ag alloy with Au,Ag content of about 1:1 was prepared in the insulating Al2O_3 substrate. It is worth noting that au-Ag alloy nanoparticles exhibit different photoluminescence spectra. These findings provide a useful way to synthesize metal alloy nanoparticles and use them in optoelectronic devices.
【学位授予单位】：江西师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB383.1
本文编号：2205460
[Abstract]:Recently, composite nanoparticles have attracted wide attention due to their unique physical and chemical properties. It is important to study the relationship between the microstructure of composite nanoparticles and their related physical and chemical properties. In this thesis, the interaction between the strain field distribution of Ge/GeO_2 core / shell nanoparticles and their growth environment is studied systematically. In addition, high density Au-Ag alloy nanoparticles were synthesized by improved pulsed laser deposition and rapid annealing. The specific work is as follows: 1. The strain field distribution of Ge/GeO_2 core / shell nanoparticles is regulated by growth environment, and the strain field distribution of Ge/GeO_2 core / shell nanoparticles embedded in Al2O_3,Lu2O_3 and SiO_2 process is simulated by finite element method. The simulation results show that the strain of the Ge core and the GeO_2 shell are strongly dependent on the growth environment. In addition, we find that the GE core is transformed from the tensile strain to the compression strain during the growth process. And the strain transition point is closely related to the Young's modulus of the surrounding matrix material. The simulation results show that the strain field distribution of Ge/GeO_2 core / shell nanoparticles can be regulated by changing the surrounding matrix material. In order to change the surface state and optical properties of Ge/GeO_2 core / shell nanoparticles, Au-Ag alloy nanoparticles embedded in Al2O_3 matrix were prepared by PLD method. The Au-Ag alloy with Au,Ag content of about 1:1 was prepared in the insulating Al2O_3 substrate. It is worth noting that au-Ag alloy nanoparticles exhibit different photoluminescence spectra. These findings provide a useful way to synthesize metal alloy nanoparticles and use them in optoelectronic devices.
【学位授予单位】：江西师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB383.1
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