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Chemical Bonding Assembly of Multifunctional Oxide Nanocomposites

机译：多功能氧化物纳米复合材料的化学键合组装

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摘要

The synthesis, functionalization and assembly of metal oxide nanoparticles BaTiO_3 and CoFe_2O_4 is presented. The ferroelectric (BaTiO_3) and ferromagnetic (CoFe_2O_4) oxide nanoparticle surfaces are directly functionalized via the anchoring of phosphonic acid and aminosilane molecules that engender the nanoparticles with terminal carboxylic acid and amine functional groups, respectively. These promote the electrostatic self-assembly of the particles in non-polar solvents and permit the synthesis of more chemically robust assemblies linked by the covalent amide bond via the addition of the chemical coupling agent N-N'-dicyclohexylcarbodiimide. This functionalization and assembly procedure is applied to two systems: the first comprised of 50 nm BaTiO_3 and 10 nm CoFe_2O_4 particles and the second of 200 nm BaTiO_3 and 12.5 nm CoFe_2O_4 particles. The latter composites possess magnetoelectric properties when processed into dense ceramics and, as a direct result of the assembly performed in solution, have a high degree of homogeneity between the ferroelectric and ferromagnetic phases. The developed functionalization and assembly procedure is considered to be adaptable to the preparation of other hybrid oxide nanomaterials with different property combinations.
机译：介绍了金属氧化物纳米粒子BaTiO_3和CoFe_2O_4的合成，功能化和组装。铁电（BaTiO_3）和铁磁（CoFe_2O_4）氧化物纳米颗粒表面通过膦酸和氨基硅烷分子的锚固直接功能化，膦酸和氨基硅烷分子分别使纳米颗粒具有末端羧酸和胺官能团。这些促进了非极性溶剂中颗粒的静电自组装，并允许通过添加化学偶联剂N-N'-二环己基碳二亚胺来合成通过共价酰胺键连接的化学上更牢固的组装体。此功能化和组装过程应用于两个系统：第一个由50 nm BaTiO_3和10 nm CoFe_2O_4颗粒组成，第二个由200 nm BaTiO_3和12.5 nm CoFe_2O_4颗粒组成。后者的复合材料在加工成致密陶瓷时具有磁电性能，并且作为在溶液中进行组装的直接结果，在铁电相和铁磁相之间具有高度均匀性。所开发的功能化和组装程序被认为适用于制备具有不同特性组合的其他杂化氧化物纳米材料。

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  • 来源
    《Advanced Functional Materials》 |2010年第2期|231-238|共8页
  • 作者

    Gary Evans; Giap V. Duong; Michael J. Ingleson; Zhongling Xu; James T. A. Jones; Yaroslav Z. Khimyak; John B. Claridge; Matthew J. Rosseinsky;

  • 作者单位

    Department of Chemistry University of Liverpool Liverpool, L69 7ZD (UK);

    Department of Chemistry University of Liverpool Liverpool, L69 7ZD (UK);

    Department of Chemistry University of Liverpool Liverpool, L69 7ZD (UK);

    Department of Chemistry University of Liverpool Liverpool, L69 7ZD (UK);

    Department of Chemistry University of Liverpool Liverpool, L69 7ZD (UK);

    Department of Chemistry University of Liverpool Liverpool, L69 7ZD (UK);

    Department of Chemistry University of Liverpool Liverpool, L69 7ZD (UK);

    Department of Chemistry University of Liverpool Liverpool, L69 7ZD (UK);

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