کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1593610 | 1002708 | 2011 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Intrinsic room-temperature ferromagnetism of V-doped TiO2 (B) nanotubes synthesized by the hydrothermal method Intrinsic room-temperature ferromagnetism of V-doped TiO2 (B) nanotubes synthesized by the hydrothermal method](/preview/png/1593610.png)
Nanotubes of TiO2(B) phase doped with 5 at.% of vanadium (V) have been synthesized by a hydrothermal method, followed by calcination at 300 °C in air and argon atmosphere, respectively. These nanotubes exhibit ferromagnetic character with clear hysteresis loop at room-temperature. X-ray diffraction and Fourier transform infrared spectroscopy confirm that the ferromagnetic behavior is intrinsic to the material and not due to other phases and/or metallic clusters. The photoluminescence and hysteresis loop characteristics are found to be dependent on calcination conditions, and implicate the role of oxygen vacancies. Existence of higher oxygen vacancies in V-doped TiO2(B) nanotubes synthesized in argon than the air atmosphere is supported by the room-temperature photoluminescence spectra. The enhanced ferromagnetic behavior observed in V-doped TiO2(B) nanotubes synthesized in argon than the air atmosphere is explained in terms of bound magnetic polaron (BMP) model.
► The V-doped nanotubes have been synthesized by the hydrothermal method.
► PL spectra show that the argon calcined V-doped TiO2(B) contains more oxygen vacancies than the one calcined in air.
► RTFM observed in both air and argon calcined V-doped TiO2(B) nanotubes.
► Variation in Ms is correlated with the concentration of oxygen vacancies formation.
Journal: Solid State Communications - Volume 151, Issue 20, October 2011, Pages 1500–1503