Local structure and optical absorption characteristic investigationon Fe doped TiO<SUB>2</SUB> nanoparticles

ZHAO Tian-Xing; FENG Ya-Juan; HUANG Jun-Heng; HE Jin-Fu; LIU Qing-Hua; PAN Zhi-Yun; WU Zi-Yu

doi:10.1088/1674-1137/39/2/028001

Chinese Physics C> 2015, Vol. 39> Issue(2) : 028001 DOI: 10.1088/1674-1137/39/2/028001

Local structure and optical absorption characteristic investigationon Fe doped TiO₂ nanoparticles

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Abstract：
The local structures and optical absorption characteristics of Fe doped TiO₂ nanoparticles synthesized by the sol-gel method were characterized by X-ray diffraction (XRD), X-ray absorption fine structure spectroscopy (XAFS) and ultraviolet-visible absorption spectroscopy (UV-Vis). XRD patterns show that all Fe-doped TiO₂ samples have the characteristic anatase structure. Accurate Fe and Ti K-edge EXAFS analysis further reveal that all Fe atoms replace Ti atoms in the anatase lattice. The analysis of UV-Vis data shows a red shift to the visible range. According to the above results, we claim that substitutional Fe atoms lead to the formation of structural defects and new intermediate energy levels appear, narrowing the band gap and extending the optical absorption edge towards the visible region.

References

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ZHAO Tian-Xing, FENG Ya-Juan, HUANG Jun-Heng, HE Jin-Fu, LIU Qing-Hua, PAN Zhi-Yun and WU Zi-Yu. Local structure and optical absorption characteristic investigationon Fe doped TiO₂ nanoparticles[J]. Chinese Physics C, 2015, 39(2): 028001. doi: 10.1088/1674-1137/39/2/028001

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Received: 2014-03-05
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Local structure and optical absorption characteristic investigationon Fe doped TiO₂ nanoparticles

Corresponding author: PAN Zhi-Yun,

Corresponding author: WU Zi-Yu,

Received Date: 2014-03-05

Accepted Date: 2014-04-10

Available Online: 2015-02-05

Abstract: The local structures and optical absorption characteristics of Fe doped TiO₂ nanoparticles synthesized by the sol-gel method were characterized by X-ray diffraction (XRD), X-ray absorption fine structure spectroscopy (XAFS) and ultraviolet-visible absorption spectroscopy (UV-Vis). XRD patterns show that all Fe-doped TiO₂ samples have the characteristic anatase structure. Accurate Fe and Ti K-edge EXAFS analysis further reveal that all Fe atoms replace Ti atoms in the anatase lattice. The analysis of UV-Vis data shows a red shift to the visible range. According to the above results, we claim that substitutional Fe atoms lead to the formation of structural defects and new intermediate energy levels appear, narrowing the band gap and extending the optical absorption edge towards the visible region.

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Local structure and optical absorption characteristic investigationon Fe doped TiO₂ nanoparticles

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Local structure and optical absorption characteristic investigationon Fe doped TiO₂ nanoparticles

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Local structure and optical absorption characteristic investigationon Fe doped TiO2 nanoparticles

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通讯作者: 陈斌, bchen63@163.com

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Local structure and optical absorption characteristic investigationon Fe doped TiO2 nanoparticles

Corresponding author: PAN Zhi-Yun,

Corresponding author: WU Zi-Yu,

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Local structure and optical absorption characteristic investigationon Fe doped TiO₂ nanoparticles

Local structure and optical absorption characteristic investigationon Fe doped TiO₂ nanoparticles