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The electrochemical deposition of nanostructured cobalt films from lyotropic liquid crystalline media

The electrochemical deposition of nanostructured cobalt films from lyotropic liquid crystalline media
The electrochemical deposition of nanostructured cobalt films from lyotropic liquid crystalline media
Lyotropic liquid crystalline phases formed at high concentrations of nonionic surfactants provide a versatile templating medium that can be used to produce nanostructured materials with regular arrays of pores of nanometer dimension and extended periodicity. In this work, we have used this technique to prepare nanostructured cobalt films on gold substrates by electrochemical deposition of cobalt from cobalt acetate dissolved in the aqueous domains of the hexagonal lyotropic liquid crystalline phase of Brij 56(C16EO10). Low angle X-ray and transmission electron microscope studies show that the resulting cobalt films have a regular nanostructure consisting of a hexagonal array of cylindrical pores. The repeat distance for this nanostructure lies in the range of 7-11 nm and can be systematically varied by varying the amount of n-heptane added to the template mixture. Preliminary magnetic measurements on the nanostructured samples suggest that the coercivity (H-c) of these cobalt films is three to five times greater than that for polycrystalline cobalt and that it varies systematically with the size of the pores.
magnetic networks, nanomaterials, templates
0013-4651
C119-C123
Bartlett, Philip N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Birkin, Peter N.
ba466560-f27c-418d-89fc-67ea4f81d0a7
Ghanem, Mohamed A.
cef6c814-2709-4a2f-a052-06d28d0ba04c
de Groot, Peter
98c21141-cf90-4e5c-8f2b-d2aae8efb84d
Sawicki, M.
c96b5e84-c885-4bd3-89e8-c69e48a40d8d
Bartlett, Philip N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Birkin, Peter N.
ba466560-f27c-418d-89fc-67ea4f81d0a7
Ghanem, Mohamed A.
cef6c814-2709-4a2f-a052-06d28d0ba04c
de Groot, Peter
98c21141-cf90-4e5c-8f2b-d2aae8efb84d
Sawicki, M.
c96b5e84-c885-4bd3-89e8-c69e48a40d8d

Bartlett, Philip N., Birkin, Peter N., Ghanem, Mohamed A., de Groot, Peter and Sawicki, M. (2001) The electrochemical deposition of nanostructured cobalt films from lyotropic liquid crystalline media. Journal of the Electrochemical Society, 148 (2), C119-C123. (doi:10.1149/1.1342178).

Record type: Article

Abstract

Lyotropic liquid crystalline phases formed at high concentrations of nonionic surfactants provide a versatile templating medium that can be used to produce nanostructured materials with regular arrays of pores of nanometer dimension and extended periodicity. In this work, we have used this technique to prepare nanostructured cobalt films on gold substrates by electrochemical deposition of cobalt from cobalt acetate dissolved in the aqueous domains of the hexagonal lyotropic liquid crystalline phase of Brij 56(C16EO10). Low angle X-ray and transmission electron microscope studies show that the resulting cobalt films have a regular nanostructure consisting of a hexagonal array of cylindrical pores. The repeat distance for this nanostructure lies in the range of 7-11 nm and can be systematically varied by varying the amount of n-heptane added to the template mixture. Preliminary magnetic measurements on the nanostructured samples suggest that the coercivity (H-c) of these cobalt films is three to five times greater than that for polycrystalline cobalt and that it varies systematically with the size of the pores.

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More information

Published date: February 2001
Keywords: magnetic networks, nanomaterials, templates

Identifiers

Local EPrints ID: 64277
URI: http://eprints.soton.ac.uk/id/eprint/64277
ISSN: 0013-4651
PURE UUID: 190309e0-0ed3-4a57-81ee-f0f3fe7179cf
ORCID for Philip N. Bartlett: ORCID iD orcid.org/0000-0002-7300-6900
ORCID for Peter N. Birkin: ORCID iD orcid.org/0000-0002-6656-4074

Catalogue record

Date deposited: 09 Jan 2009
Last modified: 17 Dec 2019 02:01

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