Fabrication of segmented Au/Co/Au nanowires: Insights in the quality of Co/Au junctions

Bumjin Jang, Eva Pellicer, Miguel Guerrero, Xiangzhong Chen, Hongsoo Choi, Bradley J. Nelson, Jordi Sort, Salvador Pané

Producció científica: Contribució a revistaArticleRecercaAvaluat per experts

43 Cites (Scopus)

Resum

Electrodeposition is a versatile method, which enables the fabrication of a variety of wire-like nanoarchitectures such as nanowires, nanorods, and nanotubes. By means of template-assisted electrodeposition, segmented Au/Co/Au nanowires are grown in anodic aluminum oxide templates from two different electrolytes. To tailor the properties of the cobalt segments, several electrochemical conditions are studied as a function of current density, pulse deposition, and pH. The morphology, crystal structure, and magnetic properties are accordingly investigated. Changes in the deposition conditions affect the cobalt electrocrystallization process directly. Cobalt tends to crystallize mainly in the hexagonal close-packed structure, which is the reason cobalt might not accommodate satisfactorily on the face-centered cubic Au surface or vice versa. We demonstrate that by modifying the electrolyte and the applied current densities, changes in the texture and the crystalline structure of cobalt lead to a good quality connection between dissimilar segments. In particular, lowering the bath pH, or using pulse plating at a high overpotential, produces polycrystalline fcc Co and thus well-connected Co/Au bimetallic junctions with smooth interface. These are crucial factors to be carefully considered taking into account that nanowires are potential building blocks in micro- and nanoelectromechanical systems. © 2014 American Chemical Society.
Idioma originalAnglès
Pàgines (de-a)14583-14589
RevistaACS applied materials & interfaces
Volum6
DOIs
Estat de la publicacióPublicada - 1 de gen. 2014

Fingerprint

Navegar pels temes de recerca de 'Fabrication of segmented Au/Co/Au nanowires: Insights in the quality of Co/Au junctions'. Junts formen un fingerprint únic.

Com citar-ho