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Fe3+掺杂NaTaO3纳米粒子的制备及光吸收机理

于 水,刘玉璐,刘晓庆,王晓晶   

  1. 内蒙古大学化学化工学院,内蒙古 呼和浩特 010021
  • 出版日期:2012-06-05 发布日期:2012-06-05

Preparation and light absorption mechanism of iron doped NaTaO3 nanoparticles

YU Shui,LIU Yulu,LIU Xiaoqing,WANG Xiaojing   

  1. School of Chemistry and Chemical Engineering,Inner Mongolia University,Hohhot 010021,Inner Mongolia,China
  • Online:2012-06-05 Published:2012-06-05

摘要: 采用水热法合成了一系列铁离子掺杂NaTaO3 纳米粒子,研究了铁离子掺杂对宽禁带钽酸钠半导体光吸收性能的影响。XRD结果表明铁离子掺杂导致NaTaO3晶胞体积膨胀;紫外可见漫反射光谱表明铁离子掺杂引起钽酸钠吸收带边红移,并且随着铁离子掺杂浓度的增加,红移增大;密度泛函计算结果揭示,铁离子取代钽离子进入NaTaO3晶格会形成一个杂质能级,这个杂质能级主要由铁离子的3d轨道形成,是导致NaTaO3光吸收带边红移的原因。

关键词: NaTaO3纳米粒子, 铁离子掺杂, 密度泛函, 光吸收, 能带结构

Abstract: Pure and Fe-doped NaTaO3 nanoparticles were synthesized by hydrothermal method. XRD patterns indicated that both pure as well as iron doped NaTaO3 were pure orthorhombic phase of tantalite. UV-vis diffuse reflectance spectra clearly displayed the red-shift in the series of iron doped NaTaO3 catalysts, indicating a decrease in the band gap of NaTaO3 caused by the substitution of Fe3+ ions at Ta5+ site, and the red-shift increased with the increase of iron doping concentration in NaTaO3. The light absorption mechanism was discussed by density functional theory. Fe3+ ions substitution of Ta5+ ions resulted in an intermediate band (IB) below the bottom of the conduction band (CB), which was mainly attributed to the state of Fe 3d.

Key words: NaTaO3 nanoparticles, iron doping, density functional theory, visible light absorption, energy band structure

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