균일성과 분산성이 향산된 BaTiO3 나노입자의 수열합성
Enhanced size uniformity and dispersibility of BaTiO3 nanoparticles by hydrothermal synthesis
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본 연구는 BaTiO3 나노입자의 용액 공정의 분산성을 확보하기 위해 합성 시간과 온도 증가를 통한 입자들의 핵생성 속도 및 확산 속도를 동시에 증가시켜 수열합성을 진행하였다. 상대적으로 연구가 부족했던 20 nm 이하 균일한 크기의 BaTiO3 나노입자를 oleic acid 리간드를 매개로 180°C, 30시간의 조건에서 추가 공정 없이 합성하였다. 수열합성을 저온에서 짧은 시간 동안 진행하였을 시 입자의 응집과 크기의 불균일함을 확인하였으며, 고온에서 장시간 진행하였을 시 입자가 잘 분산되고 크기가 균일한 것을 확인하였다. 이는 고온에서 TiO2 입자의 핵 생성 속도와 Ba2+이온의 확산 거리 증가에기인한다. 비극성 용매인 mesitylene에서 향상된 분산도를 보여준 BaTiO3 나노입자의 크기와 결정도 및 흡광도는 투과전자현미경과 X-ray diffraction 및 자외/가시선 분광광도계를 통해 분석하였다. 본 연구 결과로 수열합성을 통한 BaTiO3 나노입자의 크기의 균일성과 분산성을 개선하고 다양한 전자소자에 응용 가능할 것이라 예상한다.
Abstract
In this study, we report a hydrothermal synthesis in which BaTiO3 nanoparticles (NPs) with enhanced size uniformity and dispersibility are synthesized by increased time and temperature, increasing nucleation and diffusion rates. The formation process of an uniform size of 20 nm BaTiO3 NPs, which has not been extensively researched, was optimized through hydrothermal synthesis at 180°C. Simultaneous increase in the nucleation rate of TiO2 and diffusion length of Ba2+ ions, resulting from a higher temperature, allowed for the synthesis of BaTiO3 NPs (20 nm) with significantly enhanced size-uniformity. The size and crystallinity of BaTiO3 NPs which exhibit excellent dispersibility in hexane solvent were investigated using transmission electron microscopy and X-ray diffraction. The results presented herein provide insights into improving the size uniformity and dispersibility of BaTiO3 NPs by hydrothermal synthesis for applications to variety of electronic devices.
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