Electrophoretic deposition of latex-based 3D colloidal photonic crystals: A technique for rapid production of high-quality opals
Electrophoretic deposition of latex-based 3D colloidal photonic crystals: A technique for rapid production of high-quality opals
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DOI：
10.1021/cm000274l
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发表时间：
2000-09-01
影响因子：
8.6
通讯作者：
Ragoisha, GA
中科院分区：
文献类型：
--
作者：
Rogach, AL;Kotov, NA;Ragoisha, GA
用电泳沉积法在ITO玻璃载体上从单分散亚微米级带负电荷的聚苯乙烯乳胶球的水-乙醇胶体溶液中生长了三维胶体晶体。该技术提供了在几分钟的时间尺度上生产均匀的单晶胶体多层膜的可能性，与需要几周甚至几个月的重力沉降技术相比，这是一个巨大的加速。胶体晶体的SEM和AFM图像显示，密集的3D饲料有序的乳胶球延伸到大面积。电泳沉积的胶体晶体在可见光谱范围内的正入射透射光谱与位置取决于乳胶球的大小显示出显着的光子阻带。电泳沉积也被用于浸渍的3D胶体，晶体与发光的CdTe纳米晶体。碲化镉纳米晶体的发光光谱显示出在对应于胶体晶体的光子阻带的光谱位置的波长的下降。
Three-dimensional colloidal crystals have been grown by electrophoretic deposition on ITO glass supports from aqueous-ethanol colloidal solutions of monodisperse submicrometersized negatively charged polystyrene latex spheres. The technique offers the possibility to produce uniform single-crystal colloidal multilayers on the time scale of minutes, which is a drastic acceleration in comparison with the gravity sedimentation technique that needs weeks or even months. SEM and AFM images of colloidal crystals reveal that close-packed 3D fee ordering of the latex spheres extends over large areas. Electrophoretically deposited colloidal crystals show a pronounced photonic stopband in the visible spectral range in the normal incidence transmission spectra with a position depending on the size of latex spheres. The electrophoretic deposition has also been used for the impregnation of 3D colloidal, crystals with luminescent CdTe nanocrystals. The luminescence spectrum of CdTe nanocrystals shows a dip at the wavelengths corresponding to the spectral position of the photonic stopband of the colloidal crystal.