几种稀土微/纳米发光材料的可控合成及其性能研究

Abstract

微/纳米材料的形貌、尺寸和维度对其物理化学性质有着十分重要的影响，因此制备形貌可控的微/纳米材料、研究晶体的生长机理并探索其应用成为目前化学和材料学领域研究的热点。由于稀土元素独特的4f电子层结构，其化合物在光学、电学、磁学等各个领域都有广泛的应用。基于以上考虑，本文主要利用水热/溶剂热法制备了一系列稀土微/纳米材料，并对其生长机理、光谱特性和载药功能进行了研究。 通过掺杂Ca2+和Sr2+离子制备了常温稳定的六方相GdF3，碱土金属掺杂后引起的晶格膨胀和阴离子缺陷是六方相稳定的主要原因，以Eu3+离子为结构探针研究了正交相向六方相的转变过程。Ba2+离子虽不能引起相转变，但可作为形貌控制剂诱导正交相GdF3从亚微米盘演化为椭球状纳米结构。 在柠檬酸三钠的辅助下合成了磁性-荧光-多孔三功能BaGdF5纳米球。探讨了未掺杂激活离子时样品的发光机理，评价了样品的水溶性、细胞毒性和顺磁性能，并测...The chemical and physical properties of nano-/micromaterials are fundamentally related to their size, shape, and dimensionality, and therefore fabricating morphology-controlled nano-/micromaterials, understanding the crystal growth mechanism, and exploring their application has been the research hotspot in chemistry and material science. Rare earth compounds have been widely used in the fields of optics, electrics, and magnetism due to the unique characteristics resulting from the 4f electrons of rare earth ions. On the basis of above considerations, the dissertation is focused on the controllable synthesis of rare earth nano/micromaterials with hydro/solvthermal method. The growth mechanism, luminescent properties, and drug application in drug delivery have also been investigated. The mai..