二氧化碲及其复合材料的制备与研究

发布时间：2018-02-08 09:10

  本文关键词： 二氧化碲 碳量子点 复合物 发光 多孔微球　出处：《暨南大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文探讨了纳米二氧化碲(Te O2NPs)、Te O2微晶、含氮碳量子点(NCDs)、Te O2/NCDs复合物以及稀土掺杂Te O2:Er3+/Yb3+和Te O2:Tm3+/Yb3+上转换发光多孔微球的制备,并对它们的性质进行了一系列的研究。1.利用谷氨酸(Glu)和天冬氨酸(Asp)作为催化剂和修饰剂,水解亚碲酸钠,制备出粒径主要分布在30-80 nm的球形Te O2纳米粒子(Te O2NPs)。采用红外光谱分析Glu、Asp对Te O2NPs的化学吸附方式,根据羧基对称伸缩振动和反对称伸缩振动的绝对值判断化学吸附模式,推论Glu对Te O2NPs的化学吸附为双齿桥接,而Asp对Te O2NPs的化学吸附为双齿螯合,并解析双齿螯合的吸附过程。讨论高温对Te O2NPs形貌和结构的影响,对Te O2NPs-Asp溶胶在180℃水热和600℃煅烧条件下分别得到的产物Te O2/NCDs复合物、Te O2微晶的性质进行研究。2.分别采用Asp和Glu一步水热法制备发蓝光的NCDs。在前一章基础上,在NCDs体系中利用Na2Te O3在酸性条件下水解的性质,制备Te O2/NCDs复合物。对比研究NCDs和Te O2/NCDs复合物的红外光谱、XRD、荧光光谱,对复合物进行了电化学测试,结果表明Te O2/NCDs复合物具有与NCDs近似的荧光性质及良好的电化学活性。3.采用水热和煅烧处理,以Te O2NPs为基质掺入稀土离子Ln3+(Er3+、Tm3+、Yb3+),制备Te O2:Er3+/Yb3+上转换黄光和Te O2:Tm3+/Yb3+上转换蓝光多孔微球。利用扫描电镜对样品水热后、煅烧后的形貌和结构进行观察,解释多孔微球的制备机理。研究了样品上转换发光性质和机理。
[Abstract]:The preparation of nanocrystalline Tellurium oxide Te _ 2NPsO _ 2 microcrystals, N-containing carbon quantum dots (NCDs), Te _ 2 / O _ 2 / NCDs complexes and rare earth doped Te O _ 2: er _ 3 / Yb _ 3 and Te O _ 2: TM _ 3 / Yb _ 3 up-conversion photoluminescence porous microspheres were investigated. A series of studies were carried out on their properties. 1. Using glutamate Glu) and aspartic acid Aspas as catalysts and modifiers, sodium tellurite was hydrolyzed. The spherical Te O 2 nanoparticles, mainly distributed in 30-80 nm, were prepared. The chemical adsorption modes of Te O 2NPs were analyzed by infrared spectroscopy. The chemisorption modes were determined according to the absolute values of carboxyl symmetric stretching vibration and antisymmetric stretching vibration. It is inferred that the chemisorption of Te O 2NPs by Glu is a double tooth bridge, while the chemisorption of Asp to Te O 2NPs is a double tooth chelation, and the adsorption process of double teeth chelation is analyzed. The effects of high temperature on the morphology and structure of Te O 2NPs are discussed. The properties of Te O 2 / NCDs complex, Te O 2 / NCDs, obtained by hydrothermal treatment at 180 鈩，

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