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

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• 作者：Li Zhang ; Shihui Ge ; Yalu Zuo ; Bangmin Zhang ; Li Xi
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：May 6, 2010
• 年：2010
• 卷：114
• 期：17
• 页码：7541-7547
• 全文大小：417K
• 年卷期：v.114,no.17(May 6, 2010)
• ISSN：1932-7455

文摘

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.