不同贵金属修饰的氧化钇铕复合纳米管的制备及性能研究

发布时间：2018-04-29 20:52

本文选题：稀土 + 纳米管　；参考：《黑龙江大学》2016年硕士论文

【摘要】：本文首先通过水热法合成制备了Y(OH)_3:Eu~(3+)纳米管,然后通过真空抽滤和高温煅烧的方法使金纳米粒子负载在Y_2O_3:Eu~(3+)纳米管上。通过X射线衍射(XRD),透射电镜(TEM),扫描电镜(SEM),X射线光电子能谱(XPS)对其形貌结构进行表征。并详细研究了金的含量对Au/Y_2O_3:Eu~(3+)复合纳米管的影响。Au/Y_2O_3:Eu~(3+)在614nm监测下的激发光谱中,来自于铕离子的7F0→5H3跃迁随着金含量的增加而增强,然而其他峰却几乎消失。在其发射光谱中,Au/Y_2O_3:Eu~(3+)复合纳米管中铕离子的光谱是随着激发波长的不同而变化的。当激发波长为256 nm时,会出现~5D_4→~7F_0,~5D_7→~7F_0,~5G_2→~7F_0,~5L_6→~7F_0,~5D_0→~7F_0,~5D_0→~7F_1,~5D_0→~7F_2,~5D_0→~7F_3和~5D_0→~7F_4跃迁。当激发波长为378纳米时,会出现金纳米粒子的等离子共振峰。用同样的方法制备出Pt/Y_2O_3:Eu~(3+)复合纳米管,对其形貌和结构进行表征。并详细研究了铂的含量对Pt/Y_2O_3:Eu~(3+)复合纳米管发光性质的影响。Pt/Y_2O_3:Eu~(3+)在615 nm监测下的激发光谱中,7F0→5H3跃迁随着铂含量的增加而增强。在其激发波长为395 nm时的发射光谱中,位于634 nm的5D0→7F2分裂成两个小峰。在其激发波长为255 nm时的发射光谱中,发光主要是由5D0→7F2跃迁主导的。然而当其激发波长为534 nm时,在590 nm处出现一个较宽的峰。除了对贵金属复合的氧化钇铕纳米管进行详细的发光性质研究之外,对其表面增强拉曼性质也进行了初步的研究。选择4-ATP作为探针分子,Au/Y_2O_3:Eu~(3+)和Pt/Y_2O_3:Eu~(3+)作为表面增强拉曼基底。研究发现,不论是金粒子还是铂粒子修饰的复合纳米管,其表面增强拉曼光谱都是随着贵金属含量的增加而增强的。
[Abstract]:Firstly, Y(OH)_3:Eu~(3 nanotubes were synthesized by hydrothermal method, and then gold nanoparticles were loaded on Y_2O_3:Eu~(3 nanotubes by vacuum filtration and high temperature calcination. Its morphology and structure were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS). The effect of gold content on Au/Y_2O_3:Eu~(3) composite nanotubes. Au/ Y _ 2O _ 3: EuEU _ 3). In the excitation spectra monitored by 614nm, the 7F0 5H3 transition from europium ions increases with the increase of gold content, but the other peaks almost disappear. In its emission spectra, the spectra of europium ions in the composite nanotubes vary with the excitation wavelength. When the exciting wavelength is 256 nm, there will be 5D4 tipped, 5D7, 7F0D, 7F0, 5G2, 5G2, 5F0, 5F0, 5F0, 5D0, 5D0, 7F0, 5D0, 5D0, 5D0, 5D0, 5D0, 5D0, 5D0, 5D0, 7F0, 5D0, 5D0, 7F0, 5D0, 5D0, 5D0, 7F0, 5D0, 5D0, 7F0, 5D0, 5D0, 5D0, 5D0, 5D0, 5D0, 5F0, 5D0, 5D0, 5D0, When the excitation wavelength is 378 nm, the plasmon resonance peak of the cash nanoparticles will be produced. Pt/Y_2O_3:Eu~(3 nanotubes were prepared by the same method and their morphology and structure were characterized. The effect of platinum content on the luminescence properties of Pt/Y_2O_3:Eu~(3) composite nanotubes was studied in detail. The transition of 7F0 5H3 in the excitation spectra monitored at 615 nm was enhanced with the increase of platinum content. In the emission spectra with excitation wavelength of 395nm, the 5D0 7F2 located at 634nm splits into two small peaks. In the emission spectra with excitation wavelength of 255nm, the luminescence is dominated by the 5D0 7F2 transition. However, when the excitation wavelength is 534 nm, a wider peak appears at 590 nm. In addition to the detailed luminescence properties of the noble metal composite yttrium europium oxide nanotubes, the surface-enhanced Raman properties of the nanotubes were also studied. 4-ATP was chosen as the probe molecule Au/ Y _ s _ T _ 2O _ 3: EU ~ (3) and Pt/Y_2O_3:Eu~(3) as the surface-enhanced Raman substrate. It is found that the surface-enhanced Raman spectra of both gold and platinum modified nanotubes increase with the increase of noble metal content.
【学位授予单位】：黑龙江大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TB383.1

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