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Electrodeposition of cobalt based ferro-magnetic metal nanowires in polycarbonate films with cylindrical nanochannels fabricated by heavy-ion-track etching
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Micro Structural Technology.
2008 (English)In: Journal of Applied Electrochemistry, ISSN 0021-891X, E-ISSN 1572-8838, Vol. 38, no 5, 713-719 p.Article in journal (Refereed) Published
Abstract [en]

Polycarbonate films of thickness 30 mu m were irradiated with heavy ions by applying a flux of 10(8) ions cm(-2) to produce straight tracks perpendicular to the film surface. The tracks were preferentially etched in 6 M aqueous solution of sodium hydroxide to prepare cylindrical nanochannels. The channel diameters were tuned between 200 and 600 nm by varying the etching time. Co81Cu19 alloy nanowires were electrodeposited potentiostatically, while Co/Cu multilayered nanowires, consisting of alternating Co and Cu layers with thickness 10 nm, were synthesized by means of a pulse plating technique in channels of length 30 mu m and diameter 200 nm. Co81Cu19 alloy nanowires showed an anisotropic magnetoresistance effect of 0.6%, and the giant magnetoresistance of Co/Cu multilayered nanowires reached up to 8.0%.

Place, publisher, year, edition, pages
2008. Vol. 38, no 5, 713-719 p.
Keyword [en]
heavy ion, polycarbonate, electrodeposition, cobalt, copper, nanochannel
National Category
Engineering and Technology
URN: urn:nbn:se:uu:diva-110440DOI: 10.1007/s10800-008-9499-1ISI: 000254804700017OAI: oai:DiVA.org:uu-110440DiVA: diva2:277223
Available from: 2009-11-16 Created: 2009-11-16 Last updated: 2016-04-13Bibliographically approved
In thesis
1. Ion Tracks for Micro- and Nanofabrication: From Single Channels to Superhydrophobic Surfaces
Open this publication in new window or tab >>Ion Tracks for Micro- and Nanofabrication: From Single Channels to Superhydrophobic Surfaces
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

A method is described for preset-count irradiations between 1 and 100 ions singling-out individual ions from an ion beam with more than a billion ions arriving per second. The ion tracks are etched in a conductometric system with real-time evaluation of the acquired data. The etch process can be interrupted when reaching a preset channel diameter. Cylindrical channels are obtained by adding surfactants to the etch solution forming a self-assembled barrier between etching medium and polymer. Asymmetric etching of single ion tracks leads to pH sensitive conical pores with diode-like properties. Using etched channels as template, homogeneous and multilayer magnetic single-wires are electrodeposited. The magnetoresistivity of the wires is studied. Single-track applications comprise critical apertures (cylindric, conic, necked), asymmetric pores (pH sensitive, biospecific), Giant Magneto Resistance sensors, and spintronic devices.

On the basis of studies with individual ion tracks we tackled tilted multiporous systems such as ion beam lithography with a masked ion beam leading to micro-structures with inclined walls and anisotropic superhydrophobic ion track textures, analogous to biological shingle structures on butterfly wings. We demonstrated qualitatively, that the asymmetry of the texture translates into motion under ultrasonic agitation. This could lead to the development of rotary drives.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2010. 63 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 700
Ion track, single ion, real time, phase detection, conductometric cell, conductometry, electro replication, microtechnology, nanotechnology, surfactant, self organization, GMR, magnetic, sensor technology, hydrophobic, tilted texture.
National Category
Physical Sciences
Research subject
Materials Science
urn:nbn:se:uu:diva-111247 (URN)978-91-554-7683-0 (ISBN)
Public defence
2010-01-29, Polhemsaalen, Ångström Laboratorium, Lägerhyddsvägen 1, Uppsala, 10:15 (English)
Available from: 2010-01-07 Created: 2009-12-08 Last updated: 2010-01-15

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