Facile Synthesis under Near-Atmospheric Conditions and Physicochemical Properties of Hairy CeO2 Nanocrystallines

被引：57

作者：

Li, Xiaodong ^{[1
]}

Li, Ji-Guang ^{[1
,2
]}

Huo, Di ^{[1
]}

Xiu, Zhimeng ^{[1
]}

Sun, Xudong ^{[1
]}

机构：

[1] Northeastern Univ, Sch Met & Mat, Minist Educ, Key Lab Anisotropy & Texture Mat, Shenyang 110004, Peoples R China

[2] Natl Inst Mat Sci, Nano Ceram Ctr, Tsukuba, Ibaraki 3050044, Japan

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2009年 / 113卷 / 05期

基金：

中国国家自然科学基金;

关键词：

HYDROTHERMAL SYNTHESIS; SIZE QUANTIZATION; MESOPOROUS CEO2; CERIUM OXIDE; DOPED CEO2; X-RAY; NANORODS; POWDERS; NANOPARTICLES; RAMAN;

D O I：

10.1021/jp809703h

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：

Treating freshly prepared cerous hydroxide with hydrogen peroxide (H2O2) under ambient conditions provides a facile and efficient way for converting CeO2 nanoparticles (similar to 22 nm, 37 m(2)/g) into nanowires of fine diameters (down to similar to 5 nm) and outstanding specific surface areas (similar to 184 m(2)/g). The CeO2 nanornaterials were examined by XRD, BET, FT-IR, TG, HR-TEM, Raman scattering, and UV-vis absorption spectroscopy. The results show that the nanowires are single crystalline and of high purity and low defect (oxygen vacancy) concentration and are growing perpendicular to {220} planes. The CeO2 nanowires show indirect and direct band gaps of similar to 2.37 and 2.91 eV, respectively, which are both similar to 0.15 eV lower than those observed from the nanoparticle form (similar to 22 nm) for the respective interband transitions. The CeO2 nanowires were proposed to grow via a dissolution-reprecipitation mechanism, with an unstable Ce(OH)(3)O center dot OH hyperoxide intermediate as the template.

引用

页码：1806 / 1811

页数：6

共 58 条

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