담금 어닐링을 이용한 유·무기 코어-쉘 나노입자 파우더 합성법
Synthesis of Organic-inorganic Core-shell Nanoparticle Powder using Immersion Annealing Process
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초록
다양한 디바이스 응용분야에 블록공중합체가 사용되기 위해, 블록공중합체의 형상을 제어하기 위한 간단하면서도 실용적인 합성방법이 필요하다. 하지만 콜로이드성의 형판을 사용하는 기존의 방식은 공정이 복합하고 비용이 많이발생하여, 고순도의 코어-쉘 나노입자를 대량생산하기에 적합하지 않다. 본 논문에서 PS-b-PDMS 블록공중합체를 담금어닐링하여, 20 nm 이하크기를 가지는 PS가 봉입된 코어-쉘 구조의 SiOx나노입자를 합성하였다. 또한, 어닐링 공정에 사용되는 헵테인과 에탄올의 혼합비율이 자기조립된 PS-b-PDMS 블록공중합체 나노입자의 형상에 어떠한 영향을 미치는지 분석하였으며, 최적의 담금어닐링 조건에서 나노입자가 worm-like구조로 변화하는 것을 확인하였다. 이러한 파우더합성법은 다른 용매기반의 블록공중합체 합성방법에 응용이 가능할 것으로 생각되며, 새로운 가이드라인을 제공할 것으로 예상된다.
Abstract
Simple and useful synthetic process to control the morphology of block copolymers (BCPs) is required for implementation in various device applications. However, the conventional method to use colloidal templates is not enough to realize the production of pure and massive core-shell nanoparticles due to the cost-intensive complex process. Here, we introduce a novel and facile synthesis method to realize the formation of core-shell SiOx nanoparticle power by employing an immersion annealing of a sphere-forming poly(styrene-b-dimethylsiloxane) (PS-b-PDMS) BCP. We successfully obtained a PS-encapsulated SiOx nanoparticle with a diameter of ~20 nm. In addition, we analyzed how the mixing ratio of heptane/ethanol affects the BCP morphology of self-assembled PS-b-PDMS nanoparticles, showing a worm-like structure under the optimum immersion conditions. This useful approach is expected to be extendable to other solvent-based BCP synthesis, providing a new guideline for unique BCP production.
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