SiO2@TiO2:Eu3+ and Its Derivatives: Design, Synthesis, and Properties
SiO2@TiO2:Eu3+ and Its Derivatives: Design, Synthesis, and Properties
复制标题
DOI：
10.1021/acs.cgd.7b01149
复制
发表时间：
2017-12-01
影响因子：
3.8
通讯作者：
Zou, Haifeng
中科院分区：
文献类型：
--
作者：
Chang, Meiqi;Song, Yanhua;Zou, Haifeng
采用无表面活性剂的溶剂热法合成了SiO2@TiO2：Eu 3+核壳结构，并通过包覆SiO2层提高了其发光强度。此外，制备了不同涂层厚度的SiO2@TiO2：Eu 3 +@SiO2核双壳结构，考察了发光强度与厚度的关系。此外，还提出了表面修复效应和激发/发射光吸收效应等发光增强机理。并对SiO2@TiO2：Eu 3+核壳结构及其衍生物SiO2@TiO2：Eu 3+蛋黄壳结构和TiO 2：Eu 3+空心结构的发光性能和光催化性能进行了详细的研究。值得一提的是，通过改变SiO2@TiO2：Eu 3+核壳结构的煅烧和刻蚀过程的顺序，可以得到蛋黄壳和中空结构。其中，空心结构的发光强度最高，核壳结构的光催化剂对甲基橙橙子的降解效率最高。
SiO2@TiO2:Eu3+ core-shell structure was synthesized by a surfactant-free solvothermal method, and its luminescence intensities were increased through a coating SiO2 layer. Furthermore, SiO2@TiO2:Eu3+@SiO2 core double-shell structures with different coating thicknesses have been prepared to examine the relationship between luminescence intensity and thickness. In addition, luminescence enhancement mechanisms including the surface repair effect and excitation/emitted light absorption effect were proposed. Moreover, the luminescence properties and photocatalytic behaviors of SiO2@TiO2:Eu3+ core-shell structure and its derivatives SiO2@TiO2:Eu3+ yolk-shell structure and TiO2:Eu3+ hollow structure have been investigated in detail. It is worth mentioning that yolk-shell and hollow structures could be obtained by changing the order of the calcination and etching process of the SiO2@TiO2:Eu3+ core-shell structure. Herein, the hollow structure showed the highest luminescence intensity, and the core-shell structure exhibited excellent photocatalytic efficiency for the degradation of methyl orange.