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Nonequilibrium Microstructures for Ag–Ni Nanowires

Published online by Cambridge University Press:  06 February 2015

Rajesh K. Rai  and
Chandan Srivastava
Rajesh K. Rai
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
Chandan Srivastava*
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
*
*Corresponding author.csrivastava@materials.iisc.ernet.in
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Abstract

This work illustrates that a variety of nanowire microstructures can be obtained either by controlling the nanowire formation kinetics or by suitable thermal processing of as-deposited nanowires with nonequilibrium metastable microstructure. In the present work, 200-nm diameter Ag–Ni nanowires with similar compositions, but with significantly different microstructures, were electrodeposited. A 15 mA deposition current produced nanowires in which Ag-rich crystalline nanoparticles were embedded in a Ni-rich amorphous matrix. A 3 mA deposition current produced nanowires in which an Ag-rich crystalline phase formed a backbone-like configuration in the axial region of the nanowire, whereas the peripheral region contained Ni-rich nanocrystalline and amorphous phases. Isothermal annealing of the nanowires illustrated a phase evolution pathway that was extremely sensitive to the initial nanowire microstructure.

Keywords

Ag–Ninanowireselectrodepositionphase transformation
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 21 , Issue 2 , April 2015 , pp. 491 - 497
Copyright
© Microscopy Society of America 2015 

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