| 학회 |
한국재료학회 |
| 학술대회 |
2018년 봄 (05/16 ~ 05/18, 삼척 쏠비치 호텔&리조트) |
| 권호 |
24권 1호 |
| 발표분야 |
3. 나노입자 합성 및 응용-오거나이저: 배성환 교수(경남대) |
| 제목 |
Synthesis and Self-Assembly of Polymer-Coated Au Nanocrystals |
| 초록 |
Colloidal nanocrystal (NC) can serve as a promising building block for the development of metamaterials. NCs show new material properties that are not observed in nature not only by changing surface-to-volume ratio, particle-to-particle distance, and chemical composition, but also by controlling assembly structures of NCs to manipulate their ensemble properties, which stresses the importance of developing strategy that can vary NC assembly structure. Herein, I present preparation of polystyrene coated gold NCs (Au@PS) and manipulation of their superstructure through PS grafting density control. As-prepared grafting density controlled Au NCs were self-assembled through liquid-air self-assembly technique which allowed formation of large area NC superlattices. The 3-dimensional superstructures of Au@PS with different PS grafting density were investigated using transmission electron microscope (TEM) and grazaing incidence small angle x-ray scattering (GISAXS) measurements. Very interestingly, we observed the superstructure transition from body centered cubic structure to face centered cubic structure when increasing grafting density, which can be attributed to the transition of the polymer shell from soft shell to hard shell upon grafting density increase. We believe this work paves a new way to manipulate NC assembly structure for building new metamaterials. |
| 저자 |
Hongseok Yun, Bumjoon Kim
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| 소속 |
KAIST |
| 키워드 |
<P>nanocrystal; self-assembly; gold; polymer; close packed strucure</P>
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| E-Mail |
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