Lamarre Samuel S, Yockell-Lelièvre Hélène, Ritcey Anna M
Département de chimie and CERMA, Université Laval, Pavillon Alexandre-Vachon, 1045, avenue de la Médecine, Québec, Québec G1V 0A6, Canada.
Département de chimie and CERMA, Université Laval, Pavillon Alexandre-Vachon, 1045, avenue de la Médecine, Québec, Québec G1V 0A6, Canada.
J Colloid Interface Sci. 2015 Apr 1;443:131-6. doi: 10.1016/j.jcis.2014.12.009. Epub 2014 Dec 9.
Gold nanoparticles (NPs) coated with thiol-terminated polystyrene chains of varying molar mass were added to polystyrene-b-polymethylmethacrylate (PS-b-PMMA) block copolymer monolayers at the air-water interface. Composite films were transferred to solid substrates by the Langmuir-Blodgett technique. For most of the investigated systems, TEM micrographs and AFM images reveal the formation of 2D island-like aggregates of particles organized on a close-packed hexagonal lattice. This characteristic aggregate formation is lost when PS ligands are within the same length regime as the PS block from the copolymer. The results are compared with those obtained for analogous systems containing no copolymer where NPs are deposited on either a bare water surface or bare glass. Interparticle distance between NPs is found to depend on the surface on which they are deposited, the presence or not of the copolymer monolayer, and ligand length.
将涂覆有不同摩尔质量的硫醇封端聚苯乙烯链的金纳米颗粒（NPs）添加到空气-水界面的聚苯乙烯-b-聚甲基丙烯酸甲酯（PS-b-PMMA）嵌段共聚物单分子层中。通过朗缪尔-布洛杰特技术将复合膜转移到固体基板上。对于大多数研究的体系，透射电子显微镜（TEM）显微照片和原子力显微镜（AFM）图像显示，颗粒形成二维岛状聚集体，排列在密排六方晶格上。当PS配体与共聚物的PS嵌段长度相当时，这种特征性的聚集体形成就会消失。将结果与不含共聚物的类似体系进行比较（在这些体系中，NPs沉积在裸露的水面或裸露的玻璃上）。发现NPs之间的颗粒间距离取决于它们所沉积的表面、共聚物单分子层的存在与否以及配体长度。
