纳米棒
结晶度
光致发光
高分辨率透射电子显微镜
热液循环
拉曼光谱
材料科学
铈
化学工程
X射线光电子能谱
成核
纳米颗粒
纳米结构
电介质
纳米技术
分析化学(期刊)
化学
有机化学
复合材料
透射电子显微镜
工程类
物理
光电子学
光学
冶金
作者
Fanming Meng,Leini Wang,Jingbiao Cui
标识
DOI:10.1016/j.jallcom.2012.12.096
摘要
Morphology control of CeO2 nanostructures was achieved by using ethanol/water mixtures with varied volume ratios from 0:1 to 1:0 in a facile hydrothermal process with CeCl3⋅7H2O as cerium source and N2H4⋅H2O as mineralizer. It was found that the increase of ethanol/water ratio resulted in the morphology change from thin nanorods to short-thick nanorods, and then to nanoparticles, which is mainly attributed to the influences of hydrocarbon chains, dielectric constant, and viscosity of the solution on the thermodynamics of the reaction system and kinetics of nucleation. Various characterization techniques have been used to study the CeO2 nanostructures, including XRD, XPS, SEM, HRTEM, Raman, and PL spectra. Photoluminescence spectra of the CeO2 nanoparticals exhibited an unique UV–violet–blue emission which is likely associated with the defect states existing extensively between Ce 4f and O 2p bands, better crystallinity of the sample, and higher concentration of Ce3+ ions in sample.
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