期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 13, 页码 10265-10273出版社
AMER CHEMICAL SOC
DOI: 10.1021/am501672e
关键词
binary colloidal crystals; improved convective self-assembly; size ratio; photonic bandgap; sensing
资金
- National University of Singapore
- Agency for Science, Technology and Research (A*STAR) [0921540099, 0921540098]
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.
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