静电纺丝法制备一维稀土氟氧化物和氟化物

发布时间：2018-05-06 13:50

本文选题：静电纺丝 + 一维　；参考：《吉林大学》2010年硕士论文

【摘要】： 一维纳米材料,诸如纳米线、纳米管、纳米棒等,由于有着独特的性质,成为人们研究的热点而备受关注。一维纳米材料在光学领域中被广泛应用。氟化物在稀土掺杂的发光材料中起至关重要的作用。然而关于一维二元氟化物材料的研究至今没有文献报道。因此该方面的研究显得很有意义。本文采用了静电纺丝法分别合成了一维氟氧化物和氟化物,并对其性质进行了表征。主要工作如下: 1、合成聚乙烯吡咯烷酮/三氟乙酸钇的复合纤维,通过扫描电镜观察纤维的形貌,研究不同的电纺参数和溶液性质对纤维形貌的影响。三氟乙酸钇均匀分布在复合纤维中。复合纤维的直径分布在几十纳米至几百纳米之间。 2、将合成的聚乙烯吡咯烷酮/三氟乙酸钇复合纤维在空气中煅烧。生成的氟氧化钇保持了一维的纤维结构。我们对氟氧化物的生成机理探讨,并研究不同煅烧条件下样品性质的变化。从透射电镜照片可以看到:氟氧化钇纤维是由纳米晶粒堆砌而成。随着煅烧条件的改变,纳米晶粒的尺寸发生变化。 3、在氟化氢铵分解生成的保护气下对已合成的氟氧化物进行第二次煅烧,样品被氟化生成一维氟化物。利用扫描电镜、透射电镜测量了样品尺寸和形貌。煅烧温度高不利于氟化钇纤维的保持。
[Abstract]:One-dimensional nanomaterials, such as nanowires, nanotubes and nanorods, have attracted much attention because of their unique properties. One dimensional nanomaterials are widely used in the field of optics. Fluorides play an important role in rare earth doped luminescent materials. However, the study of one dimensional two element fluoride materials There is no literature report, so the research in this area is very meaningful.
In this paper, one dimensional fluorine oxide and fluoride were synthesized by electrospinning, and their properties were characterized. The main work is as follows:
1, the composite fibers of polyvinylidene pyrrolidone / yttrium three were synthesized. The morphology of the fibers was observed by scanning electron microscopy. The effects of different electrospinning parameters and solution properties on the morphology of the fibers were investigated. Three yttrium fluoroacetate was evenly distributed in the composite fibers. The diameter of the composite fibers was from ten to a few hundred nanometers.
2, the synthesized polyvinylidene pyrrolidone / yttrium three yttrium compound fiber is calcined in the air. The generated yttrium fluoride maintains a one-dimensional fiber structure. We discuss the formation mechanism of the oxide, and study the change of the properties of the samples under different calcination conditions. It can be seen from the transmission electron microscope photographs that the yttrium fluoride fiber is made from nanocrystalline grains. With the change of calcination conditions, the size of nanocrystals changes.
3, under the protective gas generated by ammonium fluoride decomposition, the synthesized fluorine oxide was calcined second times, and the sample was fluorinated to generate one-dimensional fluoride. The size and morphology of the sample were measured by scanning electron microscope. The high calcination temperature was not favorable for the retention of yttrium fluoride.

【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2010
【分类号】：TB383.1

【引证文献】