纳米Ce_(1-x)La_xO_(2-δ)复合氧化物的微波引诱燃烧合成、表征及其光学性能(英文)

Characterization and Optical Properties of Nanometer Ce_(1-x)La_xO_(2-δ) Mixed Oxide Prepared by Microwave-Induced Combustion

利用微波引诱燃烧法合成了纳米Ce1-xLaxO2-δ(x=0-0.25)复合氧化物。X射线衍射和Raman光谱结果表明所合成的Ce1-xLaxO2-δ纳米颗粒具有与体相CeO2一样的氟化物结构。TEM(透射电镜)图像证明合成样品具有类盘状的网络结构,FE-SEM(场发射扫描电镜)说明Ce1-xLaxO2-δ固溶体具有多孔形态。在400nm以下所有的样品对紫外-可见光都具有较强的吸收,同时分别在208和352nm(5.97,3.53eV)处出现吸收极值。利用254nm的氙激光为激发源,样品Ce0.85La0.15O2-δ在378nm处具有较强的发射峰。

Nano-sized Ce1-xLaxO2-δ (x=0-0.25) mixed oxides were prepared using a microwave induced combustion method. Results from X-ray diffraction (XRD) and Raman spectroscopy analysis indicate that the synthesized Ce1-xLaxO2-δ nanoparticles have the fluorite structure of the bulk CeO2. The transmission electron micrograph(TEM)images show that the samples contain plate like structure of networked nanocrystalline, while the field-emission scanning electron micrograph (FE-SEM) images exhibit that Ce1-xLaxO2-δ solid solution have porous morphology. All samples show strong UV-vis absorption below 400 nm (3.10 eV) with well defined absorbance peak at around 208 and 352 nm (5.97 and 3.53 eV respectively). The as-prepared Ce0.85La0.15O2-δ sample has a strong UV emission band at 378 nm using a Xenon laser of 254 nm as excitation source.