Canet-Ferrer J, Albella P, Ribera A, Usagre J V, Maier S A
Instituto de ciencia molecular (ICMol) de la Universidad de Valencia, c/ Catedrático José Beltrán Martínez num. 2, E46980 Paterna, Spain.
Nanoscale Horiz. 2017 Jul 1;2(4):205-216. doi: 10.1039/c6nh00225k. Epub 2017 Apr 24.
Hybrid systems based on magnetite and gold nanoparticles have been extensively used as bifunctional materials for bio- and nano-technology. The properties of these composites are assumed to be closely related to the magnetite to gold mass ratio and to the geometry of the resulting hetero-structures. To illustrate this, we compare and analyze the optical and magnetic properties of core-shell, dumbbell-like dimers and chemical cross-linked pairs of magnetite and gold nanoparticles in detail. We explore how the combination of gold with magnetite can lead to an improvement of the optical properties of these systems, such as tunability, light scattering enhancement or an increase of the local electric field at the interface between magnetic and plasmonic constituents. We also show that although the presence of gold might affect the magnetic response of these hybrid systems, they still show good performance for magnetic applications; indeed the resulting magnetic properties are more dependent on the NP size dispersion. Finally, we identify technological constraints and discuss prospective routes for the development of further magnetic-plasmonic materials.
基于磁铁矿和金纳米粒子的混合系统已被广泛用作生物和纳米技术的双功能材料。这些复合材料的性质被认为与磁铁矿与金的质量比以及所得异质结构的几何形状密切相关。为了说明这一点，我们详细比较和分析了核壳结构、哑铃状二聚体以及磁铁矿和金纳米粒子的化学交联对的光学和磁性特性。我们探讨了金与磁铁矿的结合如何能够改善这些系统的光学性质，例如可调谐性、光散射增强或磁性和等离子体成分之间界面处局部电场的增加。我们还表明，尽管金的存在可能会影响这些混合系统的磁响应，但它们在磁应用中仍表现出良好的性能；实际上，所得的磁性性质更依赖于纳米粒子的尺寸分散性。最后，我们确定了技术限制，并讨论了进一步开发磁等离子体材料的潜在途径。
