Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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ZnO Micro/Nanocrystals Synthesized by Thermal Evaporation Method using Mn Powder as the Reducing Agent

Mn 분말을 환원제로 사용하여 열증발법에 의해 생성된 ZnO 마이크로/나노결정

  • So, Ho-Jin (Department of Advanced Materials Engineering, Graduate School, Dong-eui University) ;
  • Lee, Geun-Hyoung (Department of Advanced Materials Engineering, Graduate School, Dong-eui University)
  • 소호진 (동의대학교 대학원 신소재공학과) ;
  • 이근형 (동의대학교 대학원 신소재공학과)
  • Received : 2019.05.20
  • Accepted : 2019.06.28
  • Published : 2019.07.27
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Abstract

Zinc oxide(ZnO) micro/nanocrystals are grown via thermal evaporation of ZnO powder mixed with Mn powder, which is used as a reducing agent. The ZnO/Mn powder mixture produces ZnO micro/nanocrystals with diverse morphologies such as rods, wires, belts, and spherical shapes. Rod-shaped ZnO micro/nanocrystals, which have an average diameter of 360 nm and an average length of about $12{\mu}m$, are fabricated at a temperature as low as $800^{\circ}C$ due to the reducibility of Mn. Wire-and belt-like ZnO micro/nanocrystals with length of $3{\mu}m$ are formed at $900^{\circ}C$ and $1,000^{\circ}C$. When the growth temperature is $1,100^{\circ}C$, spherical shaped ZnO crystals having a diameter of 150 nm are synthesized. X-ray diffraction patterns reveal that ZnO had hexagonal wurtzite crystal structure. A strong ultraviolet emission peak and a weak visible emission band are observed in the cathodoluminescence spectra of the rod- and wire-shaped ZnO crystals, while visible emission is detected for the spherical shaped ZnO crystals.

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References

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