復(fù)合結(jié)構(gòu)納米顆粒的設(shè)計(jì)與合成
發(fā)布時(shí)間：2018-08-26 16:17
【摘要】：最近,復(fù)合納米顆粒由于其獨(dú)特的物理和化學(xué)性質(zhì)而引起了人們廣泛的關(guān)注。研究復(fù)合納米顆粒微觀結(jié)構(gòu)與其相關(guān)的物理和化學(xué)性質(zhì)之間的關(guān)系是至關(guān)重要的。本論文中,首先系統(tǒng)地研究了Ge/GeO_2核/殼納米顆粒的應(yīng)變場分布與其生長環(huán)境之間的相互作用。另外,我們使用改進(jìn)的脈沖激光沉積法結(jié)合快速退火技術(shù)一步合成了高密度的Au-Ag合金納米顆粒。具體工作如下:1、通過生長環(huán)境調(diào)控Ge/GeO_2核/殼納米顆粒的應(yīng)變場分布,利用有限元的方法模擬了Ge/GeO_2核/殼納米顆粒埋嵌在Al2O_3、Lu2O_3和SiO_2過程中的應(yīng)變場分布,模擬結(jié)果顯示了Ge核和GeO_2殼的應(yīng)變強(qiáng)烈的依賴于其生長環(huán)境,另外,我們發(fā)現(xiàn)了在生長的過程中,Ge核受到了拉伸應(yīng)變到壓縮應(yīng)變的轉(zhuǎn)變,以及應(yīng)變的轉(zhuǎn)變點(diǎn)與周圍基體材料的楊氏模量十分密切相關(guān)。模擬結(jié)果表明了可以通過改變周圍基體材料來調(diào)控Ge/GeO_2核/殼納米顆粒的應(yīng)變場分布,從而改變Ge/GeO_2核/殼納米顆粒的表面態(tài)和光學(xué)性能。2、使用PLD方法制備了埋嵌在Al2O_3基體材料中的Au-Ag合金納米顆粒。HRTEM和XPS分析清楚地表明,在絕緣Al2O_3基體材料中制備出了Au、Ag含量約為1:1的Au-Ag合金。值得注意的是,Au-Ag合金納米顆粒表現(xiàn)出不同的光致發(fā)光譜。這些發(fā)現(xiàn)提供了一種有用的方法來合成金屬合金納米顆粒,并利用在光電子器件中。
[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.
【學(xué)位授予單位】：江西師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB383.1
本文編號：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.
【學(xué)位授予單位】：江西師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TB383.1
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