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Formation and Removal of Alloyed Bimetallic Au–Ag Nanoparticles from Silicon Substrates for Tunable Surface Plasmon Resonance

Cite this: ACS Appl. Nano Mater. 2022, 5, 10, 14850–14861
Publication Date (Web):September 21, 2022
https://doi.org/10.1021/acsanm.2c03154
Copyright © 2022 American Chemical Society

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    Abstract

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    The formation of alloyed Au–Ag bimetallic nanoparticles (NPs) by the solid-state thermal dewetting of Au–Ag bilayer thin films on Si substrates was reported in this work. Complete dewetting of the bilayer thin films to form alloyed Au–Ag bimetallic NPs can be achieved at temperatures above the Tammann temperature of at least one of the metal components. The NP size depends heavily on the total thickness of the bilayer thin films, whereas the atomic ratio of Au/Ag and the sputtering order in the bilayer films do not affect the NP size significantly. It has been demonstrated by X-ray photoelectron spectroscopy (XPS) analysis that the produced Au–Ag bimetallic NPs are alloyed and the sputtering order of Au and Ag in the initial bilayer films has no impact on the final configuration of the produced NPs. To further characterize the surface plasmon resonance (SPR) of Au–Ag NPs, a procedure involving the use of poly(vinyl alcohol) (PVA) and poly(methyl methacrylate) (PMMA) was developed to remove the bimetallic NPs from the optically opaque Si substrates. The SPR peak wavelength of the bimetallic Au–Ag alloy NPs has been shown to vary linearly with the atomic percentage of Au in the NPs, allowing for the tuning of the resonance wavelength by changing the alloy composition. The ability to produce uniform Au–Ag alloy NPs by thermal dewetting, the successful removal of the Au–Ag NPs from the Si substrates into the colloidal solution, the tunable SPR, and the excellent long-term stability of the alloy NPs in solution open up many opportunities for the potential applications of these Au–Ag alloy NPs, for example, for surface functionalization, sensing, and catalysis.

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsanm.2c03154.

    • Size distribution histograms for the Au–Ag nanoparticles synthesized from thermal dewetting, SEM characterization of the as-sputtered bilayer Au–Ag thin films of various thicknesses, and STEM/HAADF images and EDX line scans of Au67Ag33 and Ag33Au67 nanoparticle samples after removal from the SiO2/Si substrates (PDF)

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    Cited By

    This article is cited by 2 publications.

    1. Linh Quy Ly, Stuart Burns, Cristina Cordoba, Michelle Dolgos, Arthur Blackburn, Yujun Shi. Fabrication of Platinum Nanoparticles with Different Morphologies by Thermal Dewetting in the Presence of Residual Oxygen and Their Optical Properties. The Journal of Physical Chemistry C 2023, 127 (50) , 24417-24431. https://doi.org/10.1021/acs.jpcc.3c05987
    2. Stephanie N. Bonvicini, Annie Hoang, Viola I. Birss, Sarah K. Purdy, Ramaswami Sammynaiken, Tsun-Kong Sham, Yujun Shi. Pt-Rich Core/Au-Rich Shell Nanoparticle Formation Using Pulsed Laser-Induced Dewetting and Their Electrochemical Characteristics. The Journal of Physical Chemistry C 2023, 127 (28) , 13945-13957. https://doi.org/10.1021/acs.jpcc.3c02849

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