Yuta Aida , Yasuhiro Nakagawa , Tetsuo Kishi , Masaki Takeguchi , Yoshihiro Nemoto , Yasutaka Anraku , Toshiyuki Ikoma
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Growth mechanism of star-shaped Au–Ag nanoparticles synthesized by ascorbic acid reduction and underpotential deposition
The growth mechanism of star-shaped Au–Ag nanoparticles, which is important for improving the absorption efficiency of nanoparticles in the near-infrared region, remains to be clarified. In this study, the growth mechanism by stabilizing certain facets of Au in spines by underpotential deposition of Ag was investigated. The nanoparticles were analyzed primarily by scanning transmission electron microscopy (STEM) and energy dispersive X-ray spectroscopy. Analysis of spines on nanoparticles synthesized with an Au/Ag ratio of 18/4 revealed that approximately 1 nm of Ag was deposited on the topmost surface of Au, and the growth direction of spines was <200>. Underpotential deposition of Ag nanolayers on specific facets of the spines on nanoparticles was observed for the first time by elemental mapping and high-angle annular dark-field STEM tomography. These findings are expected to contribute to the morphology control of plasmonic nanoparticles.
期刊介绍：
Materials Today Nano is a multidisciplinary journal dedicated to nanoscience and nanotechnology. The journal aims to showcase the latest advances in nanoscience and provide a platform for discussing new concepts and applications. With rigorous peer review, rapid decisions, and high visibility, Materials Today Nano offers authors the opportunity to publish comprehensive articles, short communications, and reviews on a wide range of topics in nanoscience. The editors welcome comprehensive articles, short communications and reviews on topics including but not limited to:
Nanoscale synthesis and assembly
Nanoscale characterization
Nanoscale fabrication
Nanoelectronics and molecular electronics
Nanomedicine
Nanomechanics
Nanosensors
Nanophotonics
Nanocomposites
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