Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Facile synthesis and characteristics of monodispersed ZnGa2O4 microsphere via solvothermal method

용매열합성법을 통한 단분산된 ZnGa2O4 구형 입자의 제조 및 특성

  • Woo, Moo Hyun (School of Advanced Materials Science & Engineering, Sungkyunkwan University) ;
  • Kang, Bong Kyun (School of Advanced Materials Science & Engineering, Sungkyunkwan University) ;
  • Yoon, Dae Ho (School of Advanced Materials Science & Engineering, Sungkyunkwan University)
  • 우무현 (성균관대학교 신소재공학과) ;
  • 강봉균 (성균관대학교 신소재공학과) ;
  • 윤대호 (성균관대학교 신소재공학과)
  • Received : 2016.04.08
  • Accepted : 2016.05.27
  • Published : 2016.06.30
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Abstract

Monodispersed $ZnGa_2O_4$ microspheres were synthesized by a facile two-step process consisting of a solvothermal method and calcination process. The prepared monodispersed $ZnGa_2O_4$ microspheres were aggregated into 3D microstructures by self-assembly with a large number of small $ZnGa_2O_4$ particles generated in nucleation. This nucleation and self-assembly making hierarchical microstructures were depended on the concentration of PEG (polyethylene glycol) due to CAC (critical aggregation concentration) theory. And also we controlled the amount of zinc acetate to make pure $ZnGa_2O_4$ phase. Additionally, to fix the optimized calcination condition, sample was characterized by TG-DTA to prove the thermal property in the calcination process and by FT-IR to identify the changes of functional group bonding between each element of the $ZnGa_2O_4$ precursor and oxide calcined at $900^{\circ}C$ for 1 h.

용매열합성법과 하소 과정으로 이루어진 두 단계 공정을 통해 단분산된 마이크로 크기의 구형 $ZnGa_2O_4$ 입자를 합성하였다. 합성된 3차원 구조의 구형 $ZnGa_2O_4$ 입자는 핵 생성과정에서 발생된 $ZnGa_2O_4$ 핵들이 자기 조립에 의해 형성된다. 이렇게 3차원 구조의 입자를 형성하는 원리인 '핵 성성'과 '자기 조립' 과정은 계면활성제인 PEG(polyethylene glycol)의 영향을 받는다. 그 이유는 계면활성제인 PEG의 농도가 임계응집농도(critical aggregation concentration)를 결정짓기 때문이다. 그리고 $ZnGa_2O_4$ 단상 합성을 위해 원료인 zinc acetate의 양을 조절했으며, 최적의 하소 조건을 결정하고자 TG-DTA를 통해 열적 거동을 확인했다. 또한 열처리 전 모체와 $900^{\circ}C$에서 1시간의 열처리 과정을 거친 산화물을 구성하는 작용기의 변화를 규명하기 위해 FT-IR을 측정하였다.

Keywords

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