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Fabrication of Segmented Au/Co/Au Nanowires: Insights in the Quality of Co/Au Junctions

Title
Fabrication of Segmented Au/Co/Au Nanowires: Insights in the Quality of Co/Au Junctions
Authors
Jang, BJ[Jang, Bumjin]Pellicer, E[Pellicer, Eva]Guerrero, M[Guerrero, Miguel]Chen, XZ[Chen, Xiangzhong]Choi, H[Choi, Hongsoo]Nelson, BJ[Nelson, Bradley J.]Sort, J[Sort, Jordi]Pane, S[Pane, Salvador]
DGIST Authors
Choi, H[Choi, Hongsoo]
Issue Date
2014-08-27
Citation
ACS Applied Materials and Interfaces, 6(16), 14583-14589
Type
Article
Article Type
Article
Keywords
Anodic Aluminum Oxide TemplateAnodic OxidationCobaltCrystal GrowthCrystalline StructureDepositionElectrochemical ConditionsElectrochemistryElectrocrystallizationElectrocrystallization ProcessElectrodepositionElectrolytesElectron MicroscopyHexagonal Close-PackedInterfacesInterfaces (Materials)Magnetic PropertiesNanorodsNanowiresPotential Building BlocksSegmented NanowiresSemiconductor JunctionsTemplate-Assisted ElectrodepositionTemplate-Assisted Electrodepositions
ISSN
1944-8244
Abstract
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.
URI
http://hdl.handle.net/20.500.11750/1583
DOI
10.1021/am5038998
Publisher
American Chemical Society
Related Researcher
  • Author Choi, Hong Soo Bio-Micro Robotics Lab
  • Research Interests Micro/Nano robot; Neural prostheses; MEMS; BMI; MEMS/NEMS; BioMEMS; MEMS 초음파 트랜스듀스; 인공와우
Files:
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Collection:
Robotics EngineeringETC1. Journal Articles


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