Synthesis and Room Temperature do Ferromagnetic Properties of α-MoO3 Nanofibers
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2015年第5期
论文作者：Sandeep K.S.Patel N.S.Gajbhiye
文章页码：453 - 457
摘 要：Herein,we report the magnetic properties of α-MoO3 nanofibers synthesized via a hydrothermal method.X-ray photoelectron and Raman spectroscopic studies have been employed to evidence the presence of oxygen vacancy defects in the α-MoO3 nanofibers.To elucidate the oxygen vacancy related ferromagnetism,post-thermal annealing in oxygen and vacuum was performed.The UV emission band of α-MoO3 nanofibers reveals a red shift from oxygen annealed to vacuum annealed,indicating a bandedge reduction.The saturation magnetization of oxygen annealed nanofibers decreases while that of vacuum annealed nanofibers increases.These results strongly confirm that the oxygen vacancies play a significant role in inducing ferromagnetism.The origin of ferromagnetism may be due to the exchange interactions among localized electron spin moments resulting from oxygen vacancies of α-MoO3 nanofibers.The presence of such defects was further supported by the photoluminescence measurements.
Sandeep K.S.Patel1，N.S.Gajbhiye1
1. Department of Chemistry,Indian Institute of Technology
摘 要：Herein,we report the magnetic properties of α-MoO3 nanofibers synthesized via a hydrothermal method.X-ray photoelectron and Raman spectroscopic studies have been employed to evidence the presence of oxygen vacancy defects in the α-MoO3 nanofibers.To elucidate the oxygen vacancy related ferromagnetism,post-thermal annealing in oxygen and vacuum was performed.The UV emission band of α-MoO3 nanofibers reveals a red shift from oxygen annealed to vacuum annealed,indicating a bandedge reduction.The saturation magnetization of oxygen annealed nanofibers decreases while that of vacuum annealed nanofibers increases.These results strongly confirm that the oxygen vacancies play a significant role in inducing ferromagnetism.The origin of ferromagnetism may be due to the exchange interactions among localized electron spin moments resulting from oxygen vacancies of α-MoO3 nanofibers.The presence of such defects was further supported by the photoluminescence measurements.
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