期刊
CERAMICS INTERNATIONAL
卷 44, 期 10, 页码 11724-11729出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.03.250
关键词
Quantum dots; Raman spectroscopy; X-ray photo electron spectroscopy; Photoluminescence; Photocatalysis
资金
- National Research Foundation (NRF) of Korea
- Ministry of Science, ICT, and Future Planning [2017R1A2B1004860]
Terbium (0, 2, and 4 at%)-doped ZnS quantum dots (QDs) were synthesized via a solvothermal method. The crystal structures of the synthesized QDs were determined to be zinc blend by X-ray powder diffraction (XRD) and Raman analyses. Transmission electron microscopy (TEM) studies revealed that particles with a mean size of 2-4 nm were formed. An X-ray photo electron spectroscopy (XPS) examination disclosed the existence of terbium with a trivalent state in the ZnS host lattice. The absorption bands of all QDs were located around 325 nm (3.81 eV) and were higher than that of the bulk ZnS band gap (3.67 eV), consistent with the quantum confinement effect. The photoluminescence spectra of the terbium-doped samples displayed five emission peaks at 467 nm (D-5(4) -> F-7(3)), 491 nm (D-5(4) -> F-7(6)), 460 nm (D-5(4) - F-7(5)), 484 nm (D-5(4) - F-7(4)), and 530 nm (D-5(4) - F-7(3)), respectively. The terbium-doped QDs exhibited a higher photocatalytic activity during the degradation of crystal violet dye under UV-light illumination compared to the undoped ZnS QDs. These interesting properties of terbium-doped ZnS QDs are potentially useful for both luminescent and photocatalysis applications.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据