Iron oxide-gold core-shell nanoparticles and thin film assembly
Iron oxide-gold core-shell nanoparticles and thin film assembly
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DOI：
10.1039/b501375e
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发表时间：
2005-01-01
影响因子：
--
通讯作者：
Zhong, CJ
中科院分区：
文献类型：
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作者：
Wang, LY;Luo, J;Zhong, CJ
本文报道了单层覆盖的氧化铁和核（氧化铁）-壳（金）纳米复合材料的合成及其组装成薄膜材料的研究结果。使用预先合成的和尺寸限定的氧化铁纳米颗粒作为用于还原金前体的晶种材料，这被证明对于用金壳（Fe氧化物@Au）包覆氧化铁核是有效的。我们合成的独特之处在于形成了具有可控表面性质的Fe氧化物@Au核壳纳米颗粒。我们的组装策略的新奇是利用金壳的配体交换反应性进行核壳纳米颗粒的薄膜组装。利用TEM、XRD、XPS、FTIR、TGA和DCP-AES等技术对核壳纳米复合材料和组装体进行了表征。除了来自TEM检测的粒径变化、UV-Vis观察的表面等离子体共振带的变化和XRD检测的涂覆金壳后磁铁矿衍射峰的消失的证据之外，通过Fe氧化物@Au颗粒的分子介导的薄膜组装体中的Au和Fe的DCP-AES组成分析进一步证实了核-壳形态的形成。据我们所知，在金壳处的粒子间配体交换沉淀化学是证明用于构建Fe氧化物@Au粒子的薄膜的壳间反应性的第一个例子。这些结果为通过核-壳纳米复合材料设计界面反应性提供了重要的见解，用于磁性，催化和生物应用。
This paper reports findings of an investigation of the synthesis of monolayer-capped iron oxide and core (iron oxide)-shell (gold) nanocomposite and their assembly towards thin film materials. Pre-synthesized and size-defined iron oxide nanoparticles were used as seeding materials for the reduction of gold precursors, which was shown to be effective for coating the iron oxide cores with gold shells (Fe oxide@Au). The unique aspect of our synthesis is the formation of Fe oxide@Au core-shell nanoparticles with controllable surface properties. The novelty of our assembly strategy is the exploitation of the ligand-exchange reactivity at the gold shells for the thin film assembly of the core-shell nanoparticles. The core-shell nanocomposites and assemblies have been characterized using TEM, XRD, XPS, FTIR, TGA, and DCP-AES techniques. In addition to evidence from TEM detection of the change in particle size, UV-Vis observation of the change in the surface plasmon resonance band, and XRD detection of disappearance of the magnetite diffraction peaks after coating the gold shell, the formation of the core-shell morphology was further confirmed by DCP-AES composition analysis of Au and Fe in the molecularly-mediated thin film assembly of Fe oxide@Au particles. The interparticle ligand exchange-precipitation chemistry at the gold shell is to our knowledge the first example demonstrating the inter-shell reactivity for constructing thin films of Fe oxide@Au particles. The results have provided important insights into the design of interfacial reactivities via core-shell nanocomposites for magnetic, catalytic and biological applications.