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Investigation of laser-induced inter-welding between Au and Ag nanoparticles and the plasmonic properties of welded dimers

Abstract

Noble metallic nanoparticles with unique plasmonic properties are useful in a variety of applications including bio-imaging, sensing, cancer therapy, etc. The properties of metallic nanoparticles can be tuned by multiple ways, among which laser welding is a highly efficient method. In this study, laser-induced inter-welding of Ag-Au nanoparticle (NP) dimers was investigated using in situ transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDX). For the first time, the welding process was directly visualized. The structural and compositional evolution of Ag-Au dimers were studied in detail, and several typical nanostructures formed during the welding process, including two types of core-shell structures, were discovered. Based on these observations, we proposed a complete mechanism explaining how welding proceeds under the influence of laser. Finite difference time domain (FDTD) simulations demonstrated that the plasmonic properties of welded Ag-Au dimers were different from those of pure Au-Au or Ag-Ag dimers and can be tuned by forming shells, alloying or changing the size ratio of Ag and Au NPs.

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Publication details

The article was received on 21 Sep 2018, accepted on 07 Nov 2018 and first published on 08 Nov 2018


Article type: Paper
DOI: 10.1039/C8NR07718E
Citation: Nanoscale, 2018, Accepted Manuscript
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    Investigation of laser-induced inter-welding between Au and Ag nanoparticles and the plasmonic properties of welded dimers

    X. Xu, T. Isik, S. Kundu and V. Ortalan, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR07718E

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