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Electrochemical synthetis of Ag/Co multilayered nanowires in porous polycarbonate membranes
Jönköping University, School of Engineering, JTH. Research area Materials and manufacturing - Surface technology. Jönköping University, School of Engineering, JTH. Research area Robust Embedded Systems.ORCID iD: 0000-0002-7095-1907
2002 (English)In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 402, no 1-2, p. 262-271Article in journal (Refereed) Published
Abstract [en]

The electrodeposition of Ag/Co multilayers into 20 μm thick ion track etched polycarbonate membranes with pore diameter of 120 nm were studied using a single bath containing cobalt sulphate, silver cyanide and potassium pyrophosphate. Cyclic voltammetry and transmission electron microscopy (TEM) was used to determine deposition conditions for pure Ag and 97 wt.% Co layers. The Co rich metallic nanowires were deposited at −1100 mV and the Ag nanowires were deposited at −600 mV vs. Ag/AgCl. By using Faraday's law and linear relation between the charges passed during the time interval for each metal layers and bilayer thickness, a current efficiency of 58% was determined for pulsed deposition of Co. This implies that hydrogen or initial layer re-dissolution of Co during Ag deposition consumes 31% of the charge passed during Co deposition. Multilayered nanowires with 8 and 15 nm thick Ag and Co rich layers, respectively, exhibit well-defined layers in TEM. X-ray diffraction investigations of 20 μm long, Ag, Co and Ag/Co multilayered nanowires show that the Ag deposits exhibited a f.c.c. 〈111〉 texturing while the Co deposit exhibited basal plane diffraction of h.c.p. (002) and f.c.c. (111). Magnetic measurements on Ag/Co multilayered nanowires have been made with the external field parallel and perpendicular to the film plane on two series of multilayers: thickness of Co (50 and 15 nm)/Ag (8 nm). In the case of longer cylinder (tCo=50 nm) the axis along the wire starts to become the easy axis (lower saturation field) as expected in the limit where tAg=0 (case of single Co nanowires), due to the shape anisotropy.

Place, publisher, year, edition, pages
2002. Vol. 402, no 1-2, p. 262-271
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Materials Engineering
Identifiers
URN: urn:nbn:se:hj:diva-6191DOI: 10.1016/S0040-6090(01)01674-1OAI: oai:DiVA.org:hj-6191DiVA, id: diva2:37011
Note
Forskningsområdet Robusta inbyggda system bytte namn till Forskningsmiljö Material och tillverkning – Ytteknik 2011-01-01 Research area Robust Embedded Systems changed its name to Research area Materials and manufacturing - Surface technology 01-01-2011 Available from: 2007-08-03 Created: 2007-08-03 Last updated: 2018-09-19Bibliographically approved

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Leisner, Peter

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