Please use this identifier to cite or link to this item: https://doi.org/10.1021/am3014482
Title: Fabrication of large domain crack-free colloidal crystal heterostructures with superposition bandgaps using hydrophobic polystyrene spheres
Authors: Cai, Z.
Liu, Y.J.
Teng, J.
Lu, X. 
Keywords: colloidal crystals
convective self-assembly
crack-free
heterostructure
large area
superposition stop bands
Issue Date: 24-Oct-2012
Citation: Cai, Z., Liu, Y.J., Teng, J., Lu, X. (2012-10-24). Fabrication of large domain crack-free colloidal crystal heterostructures with superposition bandgaps using hydrophobic polystyrene spheres. ACS Applied Materials and Interfaces 4 (10) : 5562-5569. ScholarBank@NUS Repository. https://doi.org/10.1021/am3014482
Abstract: An improved convective self-assembly method was developed to fabricate crack-free colloidal crystal heterostructure over a relatively large area. A composite opaline heterostructure composed of polystyrene (PS) colloids was first fabricated. Subsequent calcination of the opaline heterostructure led to the formation of inverse opaline heterostructure composed of SiO 2 or TiO 2. Both opaline and inverse opaline heterostructures demonstrated long-range ordering in a relatively large domain (>100 × 100 μm 2). Optical reflection measurements of the inverse opaline heterostructures showed dual stop bands as a consequence of the superposition of the stop bands from the individual compositional colloidal crystals (CCs). In addition, the relative position of the two stop bands can be adjusted by varying the size of the colloidal spheres in the original CCs template. Both types of colloidal crystal heterostructures can be used for optical filters, high-efficiency back-reflectors or electrodes in solar cells, differential drug release, and protein patterning. © 2012 American Chemical Society.
Source Title: ACS Applied Materials and Interfaces
URI: http://scholarbank.nus.edu.sg/handle/10635/88893
ISSN: 19448244
DOI: 10.1021/am3014482
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