Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Synthesis and Optical Properties of TiO2/TiOF2 Composite Powder with Controlled Phase Fractions via an Ultrasonic Spray Pyrolysis Process

초음파 분무 열분해 공정을 이용한 TiO2와 TiOF2 복합체 분말의 합성과 상 분율에 따른 광학적 성질

  • Hwangbo, Young (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Park, Woo-Young (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Lee, Young-In (Department of Materials Science and Engineering, Seoul National University of Science and Technology)
  • 황보영 (서울과학기술대학교 신소재공학과) ;
  • 박우영 (서울과학기술대학교 신소재공학과) ;
  • 이영인 (서울과학기술대학교 신소재공학과)
  • Received : 2017.03.20
  • Accepted : 2017.03.30
  • Published : 2017.06.27
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Abstract

Photoelectron-hole separation efficiency plays an important role in the enhancement of the photocatalytic activity of photocatalysts towards the degradation of organic molecules. In this study, $TiO_2/TiOF_2$ heterostructured composite powders with suitable band structures, which structures are able to separate photoelectron-hole pairs, have been synthesized using a simple and versatile ultrasonic spray pyrolysis process. In addition, their phase volume fractions have been controlled by varying the pyrolysis temperature from $400^{\circ}C$ to $800^{\circ}C$. The structural and optical properties of the synthesized powders have been characterized by X-ray diffraction, scanning electronic microscopy and UV-vis spectroscopy. The powder with a phase volume ratio close to 1, compared with single $TiOF_2$ and other composite powders with different phase volume fractions, was found to have superior photocatalytic activity for the degradation of rhodamine B. This result shows that the $TiO_2/TiOF_2$ heterostructure promotes the separation of the photoinduced electrons and holes and that this powder can be applicable to environmental cleaning applications.

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References

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