Fabrication of Ag-Au bimetallic nanoparticles by laser-induced dewetting of bilayer films

[Display omitted] Ag-Au bimetallic nanoparticles are produced by laser-induced dewetting of bilayer films. A film area of several square centimeters can be dewetted into nanoparticles by a single laser pulse. The process may be effectively utilized for the synthesis and plasmonic tuning of bimetalli...

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Bibliographic Details
Published in:Applied surface science 2018-03, Vol.434, p.1293-1299
Main Authors: Oh, Yoonseok, Lee, Jeeyoung, Lee, Myeongkyu
Format: Article
Language:English
Subjects:
Bimetallic nanoparticles
Dewetting
Laser
Plasmonics
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Summary:[Display omitted] Ag-Au bimetallic nanoparticles are produced by laser-induced dewetting of bilayer films. A film area of several square centimeters can be dewetted into nanoparticles by a single laser pulse. The process may be effectively utilized for the synthesis and plasmonic tuning of bimetallic nanoparticles. We here show that Ag-Au bimetallic nanoparticles (NPs) can be produced by dewetting an Ag/Au bilayer film coated on glass using a nanosecond-pulsed laser beam. Elemental analysis revealed that the obtained bimetallic NPs are Ag-Au alloys, with two elements well mixed over the whole volume of the particle. The composition of the produced particles was controllable by changing the relative thickness of each layer. The localized surface plasmon resonance (LSPR) peak was red-shifted with an increasing Au content and the LSPR wavelength could be tuned from 415 to 525 nm by varying the alloy composition. A film area of several square centimeters could be transformed into Ag-Au NPs by a single laser pulse of 6 ns duration. This study provides a facile and scalable route to prepare bimetallic NPs for plasmonic and other applications.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2017.11.245