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Room temperature ferromagnetic Zn0.98Co0.02O powders with improved visible-light photocatalysis

机译：室温铁磁ZN0.98CO0.02O粉末改善可见光光催化

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摘要

The realization of ferromagnetic diluted magnetic semiconductors requires the fine tuning of the energy levels of the band structure, which might have important applications in photocatalysis. The magnetic properties and visible-light photocatalytic properties of Zn0.98Co0.02O nanoparticles post-annealed under different ambient conditions (vacuum, hydrogen, vacuum followed by hydrogen) have been studied. The X-ray diffraction patterns show that all samples have a hexagonal wurtzite structure without any impurity phase. However, the Raman spectra indicate a small amount of Co3O4 impurities, which is significantly suppressed during the hydrogenation process. The as-prepared and vacuum-annealed Zn0.98Co0.02O nanoparticles show dominant paramagnetic properties, while strong room temperature ferromagnetism is observed after the hydrogenation process. This is explained by the ferromagnetic mediation between doped Co ions by the interstitial H ions. The photocatalytic activity of the resulting samples was evaluated by the degradation of Rhodamine B under visible light irradiation. It was found that the Zn0.98Co0.02O annealed in vacuum exhibited the best photodegradation properties. The enhanced performance is mainly attributed to the existence of oxygen vacancies which might decrease the surface recombination centers and improve the charge separation efficiency. The photocatalysis of hydrogenated samples is deteriorated significantly due to the passivation of oxygen vacancies by hydrogen, which confirms the ferromagnetic mediation by H+ ions instead of oxygen vacancies. Interestingly, the vacuum-annealed Zn0.98Co0.02O samples further annealed under hydrogen ambient conditions exhibit both room temperature ferromagnetism and sizable photocatalytic ability.
机译：铁磁稀释磁半导体的实现需要微调带结构的能量水平，这可能在光催化中具有重要的应用。研究了在不同环境条件下退火的Zn0.98Co0.02O纳米颗粒的磁性和可见光光催化性能（真空，氢气，真空，然后氢气）。 X射线衍射图案表明，所有样品都具有六边形纯矿石结构，没有任何杂质相。然而，拉曼光谱表示少量CO3O4杂质，在氢化过程中被显着抑制。制备的和真空退火的Zn0.98Co0.02O纳米颗粒显示了显性的顺磁性特性，而在氢化过程之后观察到强室温铁磁性。这是通过间质H离子的掺杂Co离子之间的铁磁调解解释。通过在可见光照射下罗丹明B的降解来评价所得样品的光催化活性。发现在真空中退火的Zn0.98Co0.02O表现出最佳的光降解性能。增强的性能主要归因于存在可能降低表面重组中心并提高电荷分离效率的氧空位。由于氢的氧空位钝化，氢化样品的光催化显着劣化，这证实了H +离子而不是氧空位的铁磁性调解。有趣的是，在氢气环境条件下进一步退火的真空退火的Zn0.98Co0.02O样品表现出室温铁磁性和相当化的光催化能力。

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  • 来源
    《RSC Advances》 |2016年第8期|共7页
  • 作者

    Zhang Huiyun; Hao Wei; Cao Yanqiang; Chang Xiaofeng; Xu Mingxiang; Guo Xinli; Shen Kai; Xiang Dinghan; Xu Qingyu;

  • 作者单位

    Southeast Univ Dept Phys Nanjing 211189 Jiangsu Peoples R China;

    Southeast Univ Sch Mat Sci &

    Engn Nanjing 211189 Jiangsu Peoples R China;

    Nanjing Univ Dept Mat Sci &

    Engn Nanjing 210008 Jiangsu Peoples R China;

    Nanjing Univ Coll Engn &

    Appl Sci Nanjing 210093 Jiangsu Peoples R China;

    Southeast Univ Dept Phys Nanjing 211189 Jiangsu Peoples R China;

    Southeast Univ Sch Mat Sci &

    Engn Nanjing 211189 Jiangsu Peoples R China;

    Nanjing Univ Aeronaut &

    Astronaut Sch Mat Sci &

    Technol Nanjing 210016 Jiangsu Peoples R China;

    Guilin Univ Elect Technol Guangxi Key Lab Informat Mat Guilin 541004 Peoples R China;

    Southeast Univ Dept Phys Nanjing 211189 Jiangsu Peoples R China;

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