Eu3+离子掺杂钛酸盐纳米管的直接水热合成与发光性能

 采用纳米管制备和离子掺杂同步进行的直接水热合成方法，合成了纯钛酸盐纳米管（TNT）和Eu³⁺离子掺杂的纳米管（TNT-Eu）；并利用X射线衍射（XRD）、透射电子显微镜（TEM）、光致发光谱仪研究了纳米管的形貌特征、物相组成、热稳定性和发光性能。结果显示：这种方法简便易行、稳定性好、产率高。钛酸盐纳米管物相可近似表示为(H,Na)₂Ti₃O₇或(H,Na)₂(Ti,Eu)₃O₇。高温处理对钛酸盐纳米管的结构产生很大的影响，450 ℃下纳米管的层状结构被破坏，晶体结构转化为锐钛矿型的TiO₂。TNT-Eu样品的发光性能较强，出现的393.5 nm、593 nm、614 nm的谱带归属于⁵D₀-⁷F₁和⁵D₀-⁷F₂电子的跃迁。

Direct Hydrothermal Synthesis and Luminescence Property of Titanate Nanotubes Doped with Eu3+ Ions

Pure titanate nanotubes and titanate nanotubes doped with Eu³⁺ ions were synthesized by hydrothermal method. In this process, the preparation of nanotubes is synchronously finished by doping with Eu³⁺ ions. The morphology, structure, thermal stability and luminescence property of titanate nanotubes were characterized by transmission electron microscope (TEM), X-ray diffraction (XRD), and photoluminescence instrument. The results show that the method is simple, stable and high-yield. The structure of the nanotube could be approximately indexed by (H,Na)₂Ti₃O₇ or (H,Na)₂(Ti,Eu)₃O₇. Treatment of high temperature will bring into big changes to structures of titanate nanotubes. When the calcine temperature is higher than 450 ℃, tubulous structure of titanate nanotube was destroyed and transformed into structure of anatase phase. Sample of TNT-Eu shows strong luminescence property. There exist three peaks (393.5 nm, 593 nm, 614 nm) in its luminescence spectrum which are associated to ⁵D₀-⁷F₁ and ⁵D₀-⁷F₂ Eu³⁺ electronic transition respectively.