Fabrication of artificial opals by electric-field-assisted vertical deposition.
Langmuir
; 26(4): 2346-51, 2010 Feb 16.
Article
em En
| MEDLINE
| ID: mdl-20141202
ABSTRACT
We present a new technique for large-scale fabrication of colloidal crystals with controllable quality and thickness. The method is based on vertical deposition in the presence of a DC electric field normal to the conducting substrate. The crystal structure and quality are quantitatively characterized by microradian X-ray diffraction, scanning electron microscopy, and optical reflectometry. Attraction between the charged colloidal spheres and the substrate promotes growth of thicker crystalline films, while the best-quality crystals are formed in the presence of repulsion. Highly ordered thick crystalline layers with a small amount of stacking faults and a low mosaic spread can be obtained by optimizing the growth conditions.
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MEDLINE
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En
Ano de publicação:
2010
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Article