TY - JOUR
T1 - Investigation of laser-induced inter-welding between Au and Ag nanoparticles and the plasmonic properties of welded dimers
AU - Xu, Xiaohui
AU - Isik, Tugba
AU - Kundu, Subhajit
AU - Ortalan, Volkan
N1 - Publisher Copyright:
© 2018 The Royal Society of Chemistry.
PY - 2018/12/28
Y1 - 2018/12/28
N2 - 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 in 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 was 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 a 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.
AB - 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 in 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 was 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 a 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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U2 - 10.1039/c8nr07718e
DO - 10.1039/c8nr07718e
M3 - Article
C2 - 30511072
AN - SCOPUS:85058484053
SN - 2040-3364
VL - 10
SP - 23050
EP - 23058
JO - Nanoscale
JF - Nanoscale
IS - 48
ER -