Fabrication of Well-Ordered Binary Colloidal Crystals with Extended Size Ratios for Broadband Reflectance
Fabrication of Well-Ordered Binary Colloidal Crystals with Extended Size Ratios for Broadband Reflectance
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DOI：
10.1021/am501672e
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发表时间：
2014-07-09
影响因子：
9.5
通讯作者：
Teng, Jinghua
中科院分区：
文献类型：
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作者：
Cai, Zhongyu;Liu, Yan Jun;Teng, Jinghua
二元胶体晶体在通过控制大小胶体球的尺寸比（γ（S/L））来调节材料性质方面具有很大的潜力。在本文中，我们提出了一种方法来制备具有更广泛的尺寸比在传统的对流自组装方法获得的BCC。结果表明，在胶态悬浮液中加入正硅酸乙酯（TEOS）溶胶，可使γ（S/L）提高到0.376。所得的聚苯乙烯/二氧化硅（PS/SiO2）BCC显示出独特的反射，表明它们的有序结构。扩展的尺寸比使得在工程设计BCC的光子带隙结构时具有更大的灵活性，因此为开发一系列应用（诸如光子学、自旋电子学、传感和生物分离）提供了更好的平台。
Binary colloidal crystals (BCCs) possess great potentials in tuning material properties by controlling the size ratio of small to large colloidal spheres (gamma(S/L)). In this paper, we present a method for the fabrication of BCCs with much more extended size ratios than those obtained in conventional convective self-assembly method. It is found that gamma(S/L) can be extended to 0.376 by adding TEOS sol into the colloidal suspension. The resulting polystyrene/silica (PS/SiO2) BCCs show distinctive reflections, indicating their well-ordered structure. The extended size ratios render more flexibility in engineering the photonic bandgap structures of BCCs and hence provide a better platform for developing a range of applications such as photonics, spintronics, sensing and bioseparation.