Influence of Oxygen Flow Rate on the Morphology and Magnetism of SnO2 Nanostructures

被引：95

作者：

Zhang, Li ^{[1
]}

Ge, Shihui ^{[1
]}

Zuo, Yalu ^{[1
]}

Zhang, Bangmin ^{[1
]}

Xi, Li ^{[1
]}

机构：

[1] Lanzhou Univ, Key Lab Magnetism & Magnet Mat, Minist Educ, Lanzhou 730000, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2010年 / 114卷 / 17期

基金：

中国国家自然科学基金;

关键词：

OPTICAL-PROPERTIES; TIN OXIDE; NANOWIRES;

D O I：

10.1021/jp9065604

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：

Room-temperature ferromagnetism has been observed in undoped SnO2 nanostructures with various morphologies synthesized by a chemical vapor deposition (CVD) method. The magnetization depends on the oxygen flow rate during the CVD synthesis and decreases monotonically with the increase of the oxygen flow rate. X-ray diffraction and X-ray photoelectron spectroscopy measurements show that all the samples possess a typical rutile structure, and no other impurity phases are observed. Photoluminescence and X-ray photoelectron spectroscopies were employed to evidence the presence of oxygen vacancies in these samples and reveal that the oxygen vacancies contribute to the ferromagnetism. To further test the oxygen-vacancy-related ferromagnetism, post-thermal annealing in different ambiances was performed. The results confirm that the oxygen vacancies, not Sn interstitials, play a crucial role in inducing the ferromagnetism in undoped SnO2 nanostructures.

引用

页码：7541 / 7547

页数：7

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