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首页> 外文期刊>Advanced materials for optics and electronics >Ferromagnetic Cobalt Nanoparticles and Their Immobilization on Monomolecular Films and Chemical Templates
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Ferromagnetic Cobalt Nanoparticles and Their Immobilization on Monomolecular Films and Chemical Templates

机译：铁磁钴纳米粒子及其在单分子膜和化学模板上的固定化

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摘要

Monodisperse Co nanoparticles (NPs), stabilized by organic coating have been synthesized, and their immobilization on a variety of self-assembled monolayers (SAMs) bearing different terminal groups and on SAM-based chemical templates has been studied. The NPs had an average diameter of ~10 nm and consisted of hcp cobalt covered by a thin (~1 nm) oxide film. They exhibited pronounced ferromagnetic properties with a blocking temperature above 380 K, which is unusual for the given NP size and is presumably related to the high magnetocrystalline anisotropy associated with the crystal-lographic perfection of the NPs. The NPs were found to attach selectively to the SAMs bearing the thiol tail group, whereas no stable immobilization to other SAMs, over the electrostatic forces, could be achieved. Finally, based on the results for the individual SAMs, high-contrast 2D structures of the Co NPs were fabricated on SAM-based chemical templates on both micro-and nanometer length scales. The templates were prepared by irradiation-promoted exchange reaction lithography, taking an OH-terminated aliphatic SAMs as the primary template and thiol-bearing aromatic molecules as the substituents.
机译：合成了通过有机涂层稳定的单分散Co纳米颗粒（NPs），并研究了它们固定在各种带有不同端基的自组装单分子膜（SAMs）和基于SAM的化学模板上的固定性。 NP的平均直径约为10 nm，由被薄（〜1 nm）氧化膜覆盖的hcp钴组成。它们显示出明显的铁磁特性，其阻断温度高于380 K，这对于给定的NP尺寸而言是不寻常的，并且推测与与NP的晶体学完美性相关的高磁晶各向异性有关。发现NP选择性地附着到带有硫醇尾基的SAM上，而在静电力的作用下不能稳定地固定在其他SAM上。最后，根据单个SAM的结果，在微米和纳米长度尺度上，基于SAM的化学模板制备了高对比度的Co NPs二维结构。通过辐射促进的交换反应光刻，以OH-封端的脂肪族SAM为主要模板，并以含硫醇的芳族分子为取代基，制备模板。

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  • 来源
    《Advanced materials for optics and electronics》 |2011年第24期|p.4724-4735|共12页
  • 作者

    Jianli Zhao; Marina Spasova; Zi-An Li; Michael Zharnikov;

  • 作者单位

    Angewandte Physikalische Chemie Universitat Heidelberg Im Neuenheimer Feld 253, 69120 Heidelberg, Germany;

    Fakultat fur Physik und Center for Nanolntegration Universitat Duisburg-Essen Lotharstr. 1, 47048 Duisburg, Germany;

    Angewandte Physikalische Chemie Universitat Heidelberg Im Neuenheimer Feld 253, 69120 Heidelberg, Germany;

    Angewandte Physikalische Chemie Universitat Heidelberg Im Neuenheimer Feld 253, 69120 Heidelberg, Germany;

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