Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Synthesis of size-controlled ZnO tetrapods sizes using atmospheric microwave plasma system and evaluation of its photocatalytic property

대기압 마이크로웨이브 플라즈마를 이용한 다양한 크기의 ZnO tetrapod 합성 및 광촉매 특성 평가

  • Heo, Sung-Gyu (Department of Advanced Materials Science and Engineering, Graduate School of Kangwon National University) ;
  • Jeong, Goo-Hwan (Department of Advanced Materials Science and Engineering, Graduate School of Kangwon National University)
  • 허성규 (강원대학교 대학원 신소재공학과) ;
  • 정구환 (강원대학교 대학원 신소재공학과)
  • Received : 2021.12.23
  • Accepted : 2021.12.28
  • Published : 2021.12.31
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Abstract

Among various metal oxide semiconductors, ZnO has an excellent electrical, optical properties with a wide bandgap of 3.3 eV. It can be applied as a photocatalytic material due to its high absorption rate along with physical and chemical stability to UV light. In addition, it is important to control the morphology of ZnO because the size and shape of the ZnO make difference in physical properties. In this paper, we demonstrate synthesis of size-controlled ZnO tetrapods using an atmospheric pressure plasma system. A micro-sized Zn spherical powder was continuously introduced in the plume of the atmospheric plasma jet ignited with mixture of oxygen and nitrogen. The effect of plasma power and collection sites on ZnO nanostructure was investigated. After the plasma discharge for 10 min, the produced materials deposited inside the 60-cm-long quartz tube were obtained with respect to the distance from the plume. According to the SEM analysis, all the synthesized nanoparticles were found to be ZnO tetrapods ranging from 100 to 600-nm-diameter depending on both applied power and collection site. The photocatalytic efficiency was evaluated by color change of methylene blue solution using UV-Vis spectroscopy. The photocatalytic activity increased with the increase of (101) and (100) plane in ZnO tetrapods, which is caused by enhanced chemical effects of plasma process.

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References

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