Formation of isolated and clustered Au nanoparticles in the presence of polyelectrolyte molecules using a flow-through Si chip reactor

被引：46

作者：

Köhler, JM

Wagner, J

Albert, J

机构：

[1] Tech Univ Ilmenau, Fak Math & Naturwissensch, Inst Phys, Fachgebeit Phys Chem Mikroreakt Tech, D-69684 Ilmenau, Germany

[2] Inst Phys High Technol Jena, D-07745 Jena, Germany

来源：

JOURNAL OF MATERIALS CHEMISTRY | 2005年 / 15卷 / 19期

关键词：

D O I：

10.1039/b417868h

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The formation of colloidal gold at room temperature was studied in a micro-reaction system. Ascorbic acid and Fe(II) were used as reducing agents. Besides citric acid, sodium metasilicate and poly( vinyl alcohol) were added as effectors for the formation of nanoparticles. The experimental set-up was based on a 2 + 1 + 1 static micro-mixer in order to test the successive addition of reaction components in a micro-continuous flow process. The residence times for a single mixing step in the chip device were chosen in the range between about 1 second and 1 minute. As a result, single particles of different sizes, simple particle aggregates, core-shell particles as well as complex aggregates and hexagonal nanocrystallites were obtained under different reaction conditions. The reaction mixtures were characterized by UV-Vis spectroscopy as well as by differential centrifugal sedimentation (DCS) and scanning electron microscopy (SEM) reflecting the variety of colloidal gold formed in the microreactor.

引用

页码：1924 / 1930

页数：7

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