| 학회 |
한국고분자학회 |
| 학술대회 |
2018년 봄 (04/04 ~ 04/06, 대전컨벤션센터) |
| 권호 |
43권 1호 |
| 발표분야 |
고분자가공/복합재료 |
| 제목 |
Self-Assembly of Gold Nanocrystals with Different Grafting Density |
| 초록 |
The polymorphism of ligand-coated colloidal nanocrystal (NC) assembly has been enriched by changing various factors such as ligand, temperature, and solvent. Here, we present manipulation of polystyrene-coated Au NC (Au@PS) assembly structure by changing grafting density of PS. Au NCs were ligand exchanged by PS-SH with varied PS grafting density. TEM images showed that interparticle distance increased as grafting density increased, suggesting the polymers on Au surface were gradually stretched to reduce steric hindrance. The Au@PS particles were self-assembled using liquid-air interface assembly. TEM images and grazing incidence small-angle X-ray scattering (GISAXS) measurements revealed highly ordered Au@PS particles. In particular, we observed the transition of NC assembly structure from body centered cubic (bcc) to face centered cubic (fcc) upon grafting density increase. This work stresses the importance of ligand grafting density for controlling the superstructure of NCs. |
| 저자 |
윤홍석1, 이영준1, 김진성1, 한정훈1, 장희원1, Gila E. Stein2, 김범준3
|
| 소속 |
1한국과학기술원, 2Univ. of Tennessee, 3Knoxville |
| 키워드 |
self-assembly; gold nanoparticle; polystyrene; bcc; fcc; polymorphism; liquid-air interface assembly
|
| E-Mail |
|
