One-Step Discrete Symmetric Arrangement of Magnetic Microspheres with Nanoscale Spacing Immobilized by Ultraviolet Irradiation toward Plasmonic Resonators
One-Step Discrete Symmetric Arrangement of Magnetic Microspheres with Nanoscale Spacing Immobilized by Ultraviolet Irradiation toward Plasmonic Resonators
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DOI：
10.1021/acsanm.8b01166
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发表时间：
2018-08
影响因子：
5.9
通讯作者：
Shoya Takidani;K. Aoki;M. Fujii
中科院分区：
文献类型：
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作者：
Shoya Takidani;K. Aoki;M. Fujii
微米级的顺磁球体通过克服它们之间的排斥力和平衡球体与抗磁光刻胶模具之间的磁力，一步就组织成离散的对称组件。通过改变光刻胶模具的形状和深度、球体的尺寸以及顺磁球体和背景介质的磁化率，得到了各种对称排列的球体。多年来，组装结构的永久保存一直是这类组装的一个问题，因为磁性组装结构只能在外部磁场下维持。在本研究中，我们通过在磁性组装过程中简单的紫外线照射来克服这个问题，使球体和衬底表面相互熔化和融合，从而锁定球体在衬底表面的位置。这种技术使对称排列的顺磁球体得以永久固定。
Micron-scale paramagnetic spheres are organized into discrete symmetric assemblies in a single step by overcoming the repulsive forces between them and balancing the magnetic attractive forces between the spheres and diamagnetic photoresist molds. Various symmetric arrangements of the spheres are obtained by modifying the shape and depth of the photoresist mold, the size of the spheres, and the magnetic susceptibilities of the paramagnetic spheres and the background medium. Permanent preservation of the assembled structure has been an issue for this type of assembly for years, because the magnetically assembled structures are maintained only under the external magnetic field. In this study, we overcome this issue by simple UV light irradiation during the magnetic assembly so that the surfaces of the sphere and substrate melt and fuse with each other, thus locking the position of the spheres on the substrate surface. This technique allowed permanent fixation of the symmetrically arranged paramagnetic spher...