采用双溶剂策略制备的介孔硅 SBA-15 封装 ZnO 的结构与光致发光性能。

Structure and Photoluminescent Properties of ZnO Encapsulated in Mesoporous Silica SBA-15 Fabricated by Two-Solvent Strategy.

机构信息

Institute of Materials Science and Engineering, Lanzhou University, Lanzhou, 730000 China.

出版信息

Nanoscale Res Lett. 2009 Mar 21;4(7):646-54. doi: 10.1007/s11671-009-9294-x.

DOI:10.1007/s11671-009-9294-x

PMID:20596369

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC2894238/

Abstract

The two-solvent method was employed to prepare ZnO encapsulated in mesoporous silica (ZnO/SBA-15). The prepared ZnO/SBA-15 samples have been studied by X-ray diffraction, transmission electron microscope, X-ray photoelectron spectroscopy, nitrogen adsorption-desorption isotherm, and photoluminescence spectroscopy. The ZnO/SBA-15 nanocomposite has the ordered hexagonal mesostructure of SBA-15. ZnO clusters of a high loading are distributed in the channels of SBA-15. Photoluminescence spectra show the UV emission band around 368 nm, the violet emission around 420 nm, and the blue emission around 457 nm. The UV emission is attributed to band-edge emission of ZnO. The violet emission results from the oxygen vacancies on the ZnO-SiO(2) interface traps. The blue emission is from the oxygen vacancies or interstitial zinc ions of ZnO. The UV emission and blue emission show a blue-shift phenomenon due to quantum-confinement-induced energy gap enhancement of ZnO clusters. The ZnO clusters encapsulated in SBA-15 can be used as light-emitting diodes and ultraviolet nanolasers.

摘要

采用双溶剂法制备了 ZnO 封装在介孔硅中的 ZnO/SBA-15。通过 X 射线衍射、透射电子显微镜、X 射线光电子能谱、氮气吸附-脱附等温线和光致发光光谱对制备的 ZnO/SBA-15 样品进行了研究。ZnO/SBA-15 纳米复合材料具有 SBA-15 的有序六方介孔结构。高负载的 ZnO 簇分布在 SBA-15 的通道中。光致发光光谱显示 368nm 左右的紫外发射带、420nm 左右的紫光发射带和 457nm 左右的蓝光发射带。紫外发射归因于 ZnO 的能带边缘发射。紫光发射是由于 ZnO-SiO(2)界面陷阱上的氧空位引起的。蓝光发射是来自 ZnO 中的氧空位或间隙锌离子。由于 ZnO 簇的量子限制诱导能隙增强，紫外发射和蓝光发射出现蓝移现象。封装在 SBA-15 中的 ZnO 簇可用作发光二极管和紫外纳米激光器。