원자층 두께를 갖는 대면적 TiO x 나노쉬트 합성

박희정; 이상은; 원종한

doi:https://doi.org/10.6111/JKCGCT.2017.27.6.289

논문KCI 등재

원자층 두께를 갖는 대면적 TiO x 나노쉬트 합성

The synthesis of atomically thin TiOx nanosheets with large size

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Exfoliation TiOx 2 Dimensional nanosheets Nanosheet size Stirring speed

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초록

원자층 두께의 2차원 나노쉬트(2 dimensional nanosheets)를 이용하여 제작한 필름은 나노쉬트 크기에 따라 다양한 물성을 나타낸다. 이는 필름의 물성이 쉬트와 쉬트 사이 계면물성에 의존하기 때문이다. 따라서 큰 나노쉬트의 합성은필름의 계면물성 의존도를 줄일 수 있다는 점에서 매우 중요하다. 본 연구에서 단결정 성장된 출발물질과 화학적 박리법을이용하여 마이크로미터 이상의 크기를 갖는 원자층 두께의 TiOx 나노쉬트를 제조하는데 성공하였다. 또한 제조 공정 중 유기물을 이용한 박리 단계 시 기계적 원심 교반속도가 나노쉬트 크기와 농도에 밀접히 연관되어 있음을 알 수 있었다.

Abstract

Films fabricated using atomic layer 2-dimensional nanosheets exhibit various physical properties depending on the size of the nanosheet. This is because the physical properties of the film depend on the interfacial properties between the sheets. Therefore, the synthesis of large-sized nanosheets is very important because it can reduce the dependency of the film on the interfacial properties. In this study, we succeeded in fabricating TiOx nanosheets with atomic layer thickness over micrometer size by using single-crystallized starting material and its chemical exfoliation. In addition, it was revealed that the mechanical agitation speed (the stirring speed of a magnetic bar) during the exfoliation step using the organic material is closely related to the nanosheet size and the colloidal concentration of the nanosheets.

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