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Title: Self-assembly of crack-free silica colloidal crystals on patterned silicon substrates
Authors: Cai, Z.
Teng, J.
Xia, D.
Zhao, X.S. 
Issue Date: 26-May-2011
Citation: Cai, Z., Teng, J., Xia, D., Zhao, X.S. (2011-05-26). Self-assembly of crack-free silica colloidal crystals on patterned silicon substrates. Journal of Physical Chemistry C 115 (20) : 9970-9976. ScholarBank@NUS Repository.
Abstract: Face-centered cubic (fcc) (111)-orientated twodimensional (2D) and three-dimensional (3D) crack-free silica colloidal crystals (CCs) were fabricated on patterned silicon substrates via a vertical deposition method. The influence of the surface properties of the substrate and the concentration of colloidal microspheres on the self-assembly were studied. The results showed that monolayer of silica microspheres selfassembled on a hydrophobic substrate surface while on a hydrophilic surface multilayer of silica microspheres formed under otherwise the same experimental conditions. The number of CC layers grown on the patterned substrate was proportional to the volume fraction of the colloidal microspheres. The optical properties of the samples were less influenced by the patterned surface with increasing the volume fraction of the colloidal suspension when the patterned substrates were fully covered by the CCs. The results presented in this paper reveal that the vertical deposition method can allow the formation of crack-free and well-ordered 3D CCs in large domains on patterned surfaces. © 2011 American Chemical Society.
Source Title: Journal of Physical Chemistry C
ISSN: 19327447
DOI: 10.1021/jp201674x
Appears in Collections:Staff Publications

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