Nucleation of Iron Oxy-Hydroxide Nanoparticles by Layer-by-Layer Polyionic Assemblies

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• 作者：Silvia Dante ; Zhizhong Hou ; Subhash Risbud ; and Pieter Stroeve
• 刊名：Langmuir
• 出版年：1999
• 出版时间：March 16, 1999
• 年：1999
• 卷：15
• 期：6
• 页码：2176 - 2182
• 全文大小：267K
• 年卷期：v.15,no.6(March 16, 1999)
• ISSN：1520-5827

文摘

We report here the growth and characterization of iron oxide nanoparticles by polyionic multilayersassembled by electrostatic layer-by-layer adsorption. The polyions poly(diallyldimethylammonium) chloride(PDDA) and polystyrenesulfonate (PSS) were used for the layer-by-layer assembly of the polyions.Nanoparticle nucleation was achieved by a cyclic repetition of Fe oxidative hydrolysis under an inertatmosphere. We employed UV-vis analysis for both monitoring the multilayer assembly process andascertaining the influence of the Fe oxidative hydrolysis process on the integrity of the polymer film. Nodegradation of the multilayers due to the particle growth procedure was observed. The nucleation andgrowth of needle-shaped nanoparticles with a length of about 100 nm and a width of about 10 nm weredetected by transmission electron microscopy (TEM). The void volume of the polymer matrix provided anupper limit to the particle size. As shown by selective area electron diffraction (SAED), the polycrystallineparticles were identified as mages/gifchars/beta2.gif" BORDER=0 ALIGN="middle">-FeOOH (akaganéite), a result confirmed by reflection-absorption IRspectroscopy.