Characterization and optical properties of pole-like nano-CeO2 synthesized by a facile hydrothermal method

被引：172

作者：

Wang, Leini ^{[1
]}

Meng, Fanming ^{[1
,2
]}

Li, Kangkang ^{[3
]}

Lu, Fei ^{[4
]}

机构：

[1] Anhui Univ, Sch Phys & Mat Sci, Hefei 230039, Peoples R China

[2] Dalian Univ Technol, Minist Educ, Key Lab Mat Modificat Laser Ion & Electron Beams, Dalian 116024, Peoples R China

[3] Peking Univ, Dept Microelect, Lab SoC, Beijing 100871, Peoples R China

[4] Baotou Res Inst Rare Earths, Baotou 014030, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2013年 / 286卷

关键词：

Ceria; Hydrothermal method; Oxygen defect; Optical property; NANOCRYSTALLINE CERIUM OXIDE; CEO2; NANOPARTICLES; CONTROLLABLE SYNTHESIS; CO OXIDATION; PRECIPITATION; CATALYST; OXYGEN; ROUTE; RAMAN;

D O I：

10.1016/j.apsusc.2013.09.067

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

CeO2 nanopoles have been successfully synthesized by a hydrothermal method using CeC13 center dot 7H(2)O as cerium source, NaOH as mineralizer, and ethylenediamine as complexant. The pole-like nano-CeO2 was examined by XRD, TEM, XPS, UV-vis, PL, and Raman scattering. The results show that the crystallinity of the nanopoles is not so good, and the main valence of cerium is +4. The estimated direct band gaps are 3.014, 3.099, 2.931, and 2.927 eV for the samples synthesized within 2, 18, 50, and 100h, respectively. These band gaps are smaller than bulk CeO2, oxygen vacancies and Ce3+ ions result in an effective red shifting of the band gap. The visible luminescence exhibits similar emission peaks of room temperature photoluminescence and the emission intensity increases with the increase of concentration of oxygen vacancies and Ce3+ ions. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：269 / 274

页数：6

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