Instantaneous Magnetically Assembled and Hydrophilic Photonic Crystals with Controlled Diffraction Colors
Instantaneous Magnetically Assembled and Hydrophilic Photonic Crystals with Controlled Diffraction Colors
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DOI：
10.1021/acs.jpcc.8b05967
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发表时间：
2018-08-09
影响因子：
3.7
通讯作者：
Lu, Quanjun
中科院分区：
文献类型：
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作者：
Tang, Shuge;Wang, Caiqin;Lu, Quanjun
传统光子晶体的组装过程非常耗时，而磁响应光子晶体的组装过程又是非水溶性的，这极大地限制了其在生物技术领域的应用。本文采用两步合成法，通过有序组装核壳结构的Fe3O4@poly（4-styrenesulfonicacid-co-maleic acid）（PSSMA）@SiO2 MRPC，制备了亲水性、尺寸可控的Fe3O4@poly（4-styrenesulfonicacid-co-maleic acid）（PSSMA）@SiO2 MRPC。由于PSSMA分子中含有丰富的羧基和羟基，所制备的MRPC具有良好的亲水性，表面电荷高，呈现出磁性可调的光子结构色，在水溶液中在外磁场下1 s内即可快速反射信号。通过调节磁场强度或纳米颗粒的大小，可以在整个可见光范围内调节MRPC的衍射颜色，使MRPC的结构颜色由亮红色变为浅红色。因此，具有低成本、尺寸可调、光信号响应快等优点的磁敏磁共振光子晶体在光学系统、生物传感器和生物医学成像等领域具有广阔的应用前景。
The time-consuming assembling process of the traditional photonic crystals (PCs) and non-water-dispersibility of the reported magnetic responsive PCs (MRPCs) have greatly limited the application especially in the biotechnological fields. Herein, the hydrophilic and size -controllable Fe3O4@poly(4-styrenesulfonic acid-co-maleic acid) (PSSMA)@SiO2 MRPCs were fabricated by orderly assembling of the core-shell colloidal nanocrystal clusters via a twostep facile synthesis approach. Due to the rich carboxyl and hydroxyl groups of PSSMA, the obtained MRPCs have excellent properties of hydrophilicity, high surface charge which presented magnetically tunable photonic structural colors, and rapid reflection signal in aqueous solution under external magnetic field within 1 s. The diffraction color of the MRPCs in the entire visible range could be tuned by adjusting the magnetic strength or the nanoparticle size, which bring a clear change of the structure color from brilliant red to modena by the naked eye. Thus, the magnetically sensitive MRPCs with low-cost, tunable size, and fast optical signal response indicate a promising application in optical systems, biosensors, and biomedical imaging.