Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Effect of Pyrolysis temperature on TiO2 Nanoparticles Synthesized by a Salt-assisted Ultrasonic Spray Pyrolysis Process

염 보조 초음파 분무 열분해 공정으로 합성된 TiO2 나노입자의 특성에 열분해 온도가 미치는 영향

  • Yoo, Jae-Hyun (Department of Materials Science and Engineering, Seoul National University of Science and Technology) ;
  • Ji, Myeong-Jun (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)
  • 유재현 (서울과학기술대학교 신소재공학과) ;
  • 지명준 (서울과학기술대학교 신소재공학과) ;
  • 박우영 (서울과학기술대학교 신소재공학과) ;
  • 이영인 (서울과학기술대학교 신소재공학과)
  • Received : 2019.06.18
  • Accepted : 2019.06.20
  • Published : 2019.06.28
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Abstract

In this study, ultrasonic spray pyrolysis combined with salt-assisted decomposition, a process that adds sodium nitrate ($NaNO_3$) into a titanium precursor solution, is used to synthesize nanosized titanium dioxide ($TiO_2$) particles. The added $NaNO_3$ prevents the agglomeration of the primary nanoparticles in the pyrolysis process. The nanoparticles are obtained after a washing process, removing $NaNO_3$ and NaF from the secondary particles, which consist of the salts and $TiO_2$ nanoparticles. The effects of pyrolysis temperature on the size, crystallographic characteristics, and bandgap energy of the synthesized nanoparticles are systematically investigated. The synthesized $TiO_2$ nanoparticles have a size of approximately 2-10 nm a bandgap energy of 3.1-3.25 eV, depending on the synthetic temperature. These differences in properties affect the photocatalytic activities of the synthesized $TiO_2$ nanoparticles.

Keywords

References

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