Photomagnetic hybrid ultrathin films
Photomagnetic hybrid ultrathin films
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DOI：
10.1007/s10008-006-0196-x
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发表时间：
2007-06
影响因子：
2.5
通讯作者：
Takashi Yamamoto;Y. Einaga
中科院分区：
文献类型：
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作者：
Takashi Yamamoto;Y. Einaga
采用改进的Langmuir-Blodgett方法，以蒙脱石粘土矿物为原料，制备了两种新型的金属氰化物光磁杂化膜（A膜和B膜），A膜由两亲性偶氮苯阳离子、蒙脱石和普鲁士蓝组成，其中偶氮苯发色团的光致异构化实现了对磁性的光控。观察到的光磁效率很大（约。11%），这是由于薄膜的组织结构良好。膜B由季铵盐、蒙脱土和Co-Fe普鲁士蓝组成，其中由电子转移引起的光致磁化强度相对于所施加的磁场的方向表现出各向异性响应。这种现象归因于在粘土层上形成的钴铁普鲁士蓝的独特结构。
Two novel types of photomagnetic hybrid ultrathin film (film A and B) of metal cyanides have been fabricated by means of the modified Langmuir–Blodgett method using a smectite clay mineral. Film A is composed of an amphiphilic azobenzene cation, a montmorillonite, and Prussian Blue in which photocontrol in the magnetization was realized by the photoisomerization of azobenzene chromophore. The observed photomagnetic efficiency was large (ca. 11%) due to the well-organized structure of the ultrathin film. Film B is composed of a quaternary ammonium salt, a montmorillonite, and Co–Fe Prussian Blue in which the photoinduced magnetization caused by the electron transfer exhibited an anisotropic response with regards to the direction of the applied magnetic field. This phenomenon is ascribed to the unique structure of Co–Fe Prussian Blue formed onto the clay layer.