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Analysis of Contact Interfaces for Single GaN Nanowire Devices

Analysis of Contact Interfaces for Single GaN Nanowire Devices

Published on: November 15, 2013

Nonequilibrium microstructures for Ag-Ni nanowires.

Rajesh K Rai¹, Chandan Srivastava¹

¹Department of Materials Engineering,Indian Institute of Science,Bangalore 560012,India.

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada

|February 7, 2015

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Controlling electrodeposition current in silver-nickel (Ag-Ni) nanowires yields distinct microstructures. Subsequent annealing reveals that the initial nanowire structure dictates its phase evolution pathway.

Area of Science:

Materials Science
Nanotechnology
Electrochemistry

Background:

Nanowire microstructures can be tailored through formation kinetics or post-deposition thermal treatments.
Nonequilibrium metastable microstructures in nanowires offer unique pathways for phase evolution.
Silver-nickel (Ag-Ni) nanowires present a model system for studying microstructure-property relationships.

Purpose of the Study:

To investigate the influence of electrodeposition current on the microstructure of Ag-Ni nanowires.
To explore the phase evolution of Ag-Ni nanowires with different initial microstructures upon isothermal annealing.
To establish structure-dependent phase evolution pathways in metallic alloy nanowires.

Main Methods:

Electrodeposition of 200-nm diameter Ag-Ni nanowires at different currents (15 mA and 3 mA).

Keywords:

phase transformation

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Characterization of as-deposited nanowire microstructures using electron microscopy and diffraction.

Isothermal annealing experiments to study phase evolution.

Analysis of phase transformations and microstructural changes.

Main Results:

A deposition current of 15 mA resulted in Ag-rich crystalline nanoparticles within a Ni-rich amorphous matrix.
A deposition current of 3 mA produced nanowires with an Ag-rich crystalline backbone and Ni-rich nanocrystalline/amorphous peripheral regions.
Isothermal annealing demonstrated that the phase evolution pathway is highly sensitive to the initial microstructure of the Ag-Ni nanowires.

Conclusions:

Electrodeposition current is a critical parameter for controlling Ag-Ni nanowire microstructure.
The initial microstructure significantly influences the subsequent phase evolution during thermal processing.
Understanding these structure-dependent pathways is key for designing advanced nanomaterials.