Enhancement of Photo-Oxidation Activities Depending on Structural Distortion of Fe-Doped TiO2 Nanoparticles

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• 作者：Yeonwoo Kim ; Sena Yang ; Eun Hee Jeon ; Jaeyoon Baik…
• 关键词：Distorted TiO2 ; 2 ; Aminothiophenol ; Photo ; oxidation ; Bandgap narrowing
• 刊名：Nanoscale Research Letters
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：11
• 期：1
• 全文大小：1,756 KB
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• 作者单位：Yeonwoo Kim (1)
  Sena Yang (1)
  Eun Hee Jeon (1)
  Jaeyoon Baik (2)
  Namdong Kim (2)
  Hyun Sung Kim (3)
  Hangil Lee (4)
  
  1. Molecular-Level Interfaces Research Center, Department of Chemistry, KAIST, Daejeon, 34141, Republic of Korea
  2. Beamline Research Division, Pohang Accelerator Laboratory (PAL), Pohang, 37673, Kyungbuk, Republic of Korea
  3. Department of Chemistry, Pukyoung National University, Busan, 48513, Republic of Korea
  4. Department of Chemistry, Sookmyung Women’s University, Seoul, 04310, Republic of Korea
  
• 刊物主题：Nanotechnology; Nanotechnology and Microengineering; Nanoscale Science and Technology; Nanochemistry; Molecular Medicine;
• 出版者：Springer US
• ISSN：1556-276X

文摘

To design a high-performance photocatalytic system with TiO₂, it is necessary to reduce the bandgap and enhance the absorption efficiency. The reduction of the bandgap to the visible range was investigated with reference to the surface distortion of anatase TiO₂ nanoparticles induced by varying Fe doping concentrations. Fe-doped TiO₂ nanoparticles (Fe@TiO₂) were synthesized by a hydrothermal method and analyzed by various surface analysis techniques such as transmission electron microscopy, Raman spectroscopy, X-ray diffraction, scanning transmission X-ray microscopy, and high-resolution photoemission spectroscopy. We observed that Fe doping over 5 wt.% gave rise to a distorted structure, i.e., Fe₂Ti₃O₉, indicating numerous Ti3+ and oxygen-vacancy sites. The Ti3+ sites act as electron trap sites to deliver the electron to O₂ as well as introduce the dopant level inside the bandgap, resulting in a significant increase in the photocatalytic oxidation reaction of thiol (–SH) of 2-aminothiophenol to sulfonic acid (–SO₃H) under ultraviolet and visible light illumination. Keywords Distorted TiO₂ 2-Aminothiophenol Photo-oxidation Bandgap narrowing