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Modified spin-coating technique to achieve directional colloidal crystallization.

Andrew P Bartlett¹, Moorthi Pichumani, Maximiliano Giuliani

¹Department of Physics and Physical Oceanography, Memorial University, St. John's, Newfoundland, Canada A1B 3X7.

Langmuir : the ACS Journal of Surfaces and Colloids

|January 10, 2012

Summary

Researchers developed a new spin-coating method using nonuniform electric fields to create large, oriented colloidal crystals. This technique overcomes the polycrystalline limitations of traditional spin-coating, enabling controlled crystal orientation.

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Area of Science:

Materials Science
Nanotechnology
Physical Chemistry

Background:

Fabricating large single crystals from colloidal spheres is a significant challenge.
Spin-coating is a reproducible method for colloidal crystal formation but results in polycrystalline structures due to axial symmetry.

Purpose of the Study:

To develop a novel method for fabricating large, oriented single crystals using colloidal spheres.
To overcome the inherent polycrystalline nature of spin-coated colloidal crystals.

Main Methods:

A nonuniform electric field was applied during the spin-coating process.
The electric field's stationary direction in the rotating frame broke the axial symmetry.
Field strength regulated the orientation of crystallites.

Main Results:

Successfully broke the axial symmetry inherent in spin-coating.
Achieved controlled orientation of colloidal spheres along a predefined direction.
Demonstrated local control over crystallite orientation via electric field strength.

Conclusions:

The nonuniform electric field-assisted spin-coating method enables the fabrication of oriented colloidal crystals.
This technique offers precise control over crystallite orientation, advancing the production of large single crystals.