용매열합성법을 통한 단분산된 ZnGa2O4 구형 입자의 제조 및 특성
Facile synthesis and characteristics of monodispersed ZnGa2O4 microsphere via solvothermal method
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초록
용매열합성법과 하소 과정으로 이루어진 두 단계 공정을 통해 단분산된 마이크로 크기의 구형 ZnGa2O4 입자를합성하였다. 합성된 3차원 구조의 구형 ZnGa2O4 입자는 핵 생성과정에서 발생된 ZnGa2O4 핵들이 자기 조립에 의해 형성된다. 이렇게 3차원 구조의 입자를 형성하는 원리인 ‘핵 성성’과 ‘자기 조립’ 과정은 계면활성제인 PEG(polyethylene glycol)의영향을 받는다. 그 이유는 계면활성제인 PEG의 농도가 임계응집농도(critical aggregation concentration)를 결정짓기 때문이다. 그리고 ZnGa2O4 단상 합성을 위해 원료인 zinc acetate의 양을 조절했으며, 최적의 하소 조건을 결정하고자 TG-DTA를통해 열적 거동을 확인했다. 또한 열처리 전 모체와 900 o C에서 1시간의 열처리 과정을 거친 산화물을 구성하는 작용기의변화를 규명하기 위해 FT-IR을 측정하였다.
Abstract
Monodispersed ZnGa2O4 microspheres were synthesized by a facile two-step process consisting of a solvothermal method and calcination process. The prepared monodispersed ZnGa2O4 microspheres were aggregated into 3D microstructures by self-assembly with a large number of small ZnGa2O4 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 ZnGa2O4 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 ZnGa2O4 precursor and oxide calcined at 900 o C for 1 h.
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