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Colloidal Crystal Wires from Directed Assembly

Published online by Cambridge University Press:  01 February 2011

Feng Li,
Xavier Badel,
Jan Linnros and
John B. Wiley
Feng Li
Affiliation:
Department of Chemistry and the Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148-2820 U.S.A.
Xavier Badel
Affiliation:
Department of Microelectronics and Information Technology, KTH Royal Institute of Technology, SE-164 40 Kista, Sweden
Jan Linnros
Affiliation:
Department of Microelectronics and Information Technology, KTH Royal Institute of Technology, SE-164 40 Kista, Sweden
John B. Wiley
Affiliation:
Department of Chemistry and the Advanced Materials Research Institute, University of New Orleans, New Orleans, LA 70148-2820 U.S.A.
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Abstract

Colloidal crystal wires with tubular-like packings are prepared by the directed assembly of spheres into cylindrical one-dimensional channels. Silica spheres are infiltrated into porous silicon membranes, treated with silane, and annealed. Single annealing cycles are found to result in colloidal crystal wires with varied packing geometries, while repeated annealing produces a thin translucent silica sheath around the wires. Packing in the wires varies with the relative channel diameter of the silicon membrane where typical wires contain 4 to 7 helical strands. Both chiral and achiral packing geometries are observed. The fabrication of these wires is discussed and the relationship between channel size and packing structure detailed.

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