Transformation of silver nanowires into nanoparticles by Rayleigh instability: Comparison between laser irradiation and heat treatment

[Display omitted] •Ag nanowires can be transformed into single-crystalline nanospheres by laser-driven Rayleigh instability.•Ag-Au alloy nanospheres are also produced by irradiating Ag nanowires coated with a thin Au film.•The process may be effectively utilized for the synthesis and plasmonic tunin...

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Bibliographic Details
Published in:Applied surface science 2018-01, Vol.427, p.65-73
Main Authors: Oh, Harim, Lee, Jeeyoung, Lee, Myeongkyu
Format: Article
Language:English
Subjects:
Ag nanoparticles
Nanosecond-pulsed laser
Plasmonics
Rayleigh instability
Silver nanowire
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Summary:[Display omitted] •Ag nanowires can be transformed into single-crystalline nanospheres by laser-driven Rayleigh instability.•Ag-Au alloy nanospheres are also produced by irradiating Ag nanowires coated with a thin Au film.•The process may be effectively utilized for the synthesis and plasmonic tuning of bimetallic nanoparticles. We comparatively study the morphological evolutions of silver nanowires under nanosecond-pulsed laser irradiation and thermal treatment in ambient air. While single-crystalline, pure Ag nanospheres could be produced by laser-driven Rayleigh instability, the particles produced by heat treatment were subject to oxidation and exhibited polyhedron shapes. The different results are attributed to the significantly different time scales of the two processes. In this article, we also show that bimetallic Ag-Au nanospheres can be synthesized by irradiating Ag nanowires coated with a thin Au film using a pulsed laser beam. This may provide a facile route to tune the plasmonic behavior of metal nanoparticles.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2017.08.102