標題: Structural evolution of poly(styrene-b-4-vinylpyridine) diblock copolymer/gold nanoparticle mixtures from solution to solid state
作者: Huang, Ching-Mao
Wei, Kung-Hwa
Jeng, U-Ser
Liang, Keng S.
材料科學與工程學系
Department of Materials Science and Engineering
公開日期: 10-Jul-2007
摘要: We used in situ annealing small-angle X-ray scattering to monitor the structural evolution of a spherical poly(styrene-b-4-vinylpyridine) diblock copolymer (PS-b-P4VP)/2-phenylethanethiol-coated Au nanoparticle (AuSC2Ph) mixture in the solid state during its thermal annealing. We found that the Au nanoparticles (NPs) that existed initially in a random state with some cluster packing in the PS domain diffused to the interface of the amphiphilic PS-b-P4VP diblock copolymer within 4 h at 170 degrees C under vacuum to form NP-filled shell-like assemblies, as further evidenced from transmission electron microscopy imaging. From the X-ray photoelectron spectroscopy data, we speculate that this interfacial activity of AuSC2Ph results from the fact that the initially hydrophobic Au NP surfaces became increasingly hydrophilic as most of the 2-phenylethanethiol ligands had evaporated off. The Au NP nanoshell assemblies located at the interface between PS and P4VP were quite stable even after redissolving in toluene; they remained in the form of PS-Au-P4VP core/shell/corona onion micelles, as evidenced from solution state small-angle X-ray scattering data.
URI: http://dx.doi.org/10.1021/ma0704764
http://hdl.handle.net/11536/10563
ISSN: 0024-9297
DOI: 10.1021/ma0704764
期刊: MACROMOLECULES
Volume: 40
Issue: 14
起始頁: 5067
結束頁: 5074
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