Semiconductor nanoparticle/polystyrene latex composite materials.
Semiconductor nanoparticle/polystyrene latex composite materials.
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DOI：
10.1021/la0468139
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发表时间：
2005-04
期刊：
影响因子：
--
通讯作者：
R. L. Sherman;W. Ford
中科院分区：
文献类型：
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作者：
R. L. Sherman;W. Ford
以聚半胱氨酸丙烯酰胺为稳定剂，通过三种方法将硫化镉和硒化镉/硫化镉核/壳纳米颗粒结合到聚苯乙烯（PS）乳胶上。首先，当cd颗粒的数量小于PS颗粒表面形成单层所需数量的10%或cd颗粒的数量超过PS颗粒表面形成单层所需数量时，将阴离子5 nm直径的CdS颗粒静电附着在130 nm无表面活性剂的阳离子PS乳液上，形成稳定的分散体。透射电子显微镜（TEM）显示乳胶颗粒表面有纳米颗粒。荧光光谱显示纳米颗粒的发射没有变化。其次，在CdS和CdSe/CdS纳米颗粒的存在下合成了阴离子、无表面活性剂的PS乳胶。透射电镜显示单分散乳胶颗粒被纳米颗粒捕获。第三，将苯乙烯与静电结合的乙烯基苄基（三甲基）氯化铵共聚合成表面活性剂稳定乳液。用荧光显微镜检测了亚微观复合粒子在水中的布朗运动。
Cadmium sulfide and cadmium selenide/cadmium sulfide core/shell nanoparticles stabilized with poly(cysteine acrylamide) have been bound to polystyrene (PS) latexes by three methods. First, anionic 5 nm diameter CdS particles were electrostatically attached to 130 nm surfactant-free cationic PS latexes to form stable dispersions when the amount of CdS particles was less than 10% of the amount required to form a monolayer on the surface of the PS particles or when the amount of CdS particles exceeded the amount required to form a monolayer on the PS particles. Transmission electron microscopy (TEM) showed nanoparticles on the surface of the latex particles. Fluorescence spectra showed unchanged emission from the nanoparticles. Second, anionic, surfactant-free PS latexes were synthesized in the presence of CdS and CdSe/CdS nanoparticles. TEM showed monodisperse latex particles with trapped nanoparticles. Third, surfactant-stabilized latexes were synthesized by copolymerization of styrene with vinylbenzyl(trimethyl)ammonium chloride electrostatically bound to the CdSe/CdS nanoparticle surface. Brownian motion of the submicroscopic composite particles in water was detected by fluorescence microscopy.