Please use this identifier to cite or link to this item:
Title: Ultrafast acoustic vibrations of Au–Ag nanoparticles with varying elongated structures
Authors: Zhao, Xin
Nie, Zhaogang
Feng, Yuhua
Zhao, Weiren
Zhang, Jiahua
Zhang, Wenchun
Maioli, Paolo
Loh, Zhi-Heng
Keywords: Science::Chemistry
Issue Date: 2020
Source: Zhao, X., Nie, Z., Feng, Y., Zhao, W., Zhang, J., Zhang, W., Maioli, P. & Loh, Z. (2020). Ultrafast acoustic vibrations of Au–Ag nanoparticles with varying elongated structures. Physical Chemistry Chemical Physics, 22(39), 22728-22735.
Project: MOE2018-T2-1-081 
Journal: Physical Chemistry Chemical Physics 
Abstract: Acoustic vibrations of Au and Ag elongated nano-objects with original morphologies, from Ag–Ag homodimers to Au@Ag–Ag heterodimers and Au@Ag eccentric core–shell spheroids, have been experimentally investigated by ultrafast time-resolved optical spectroscopy. Their frequencies, obtained by the analysis of time-dependent transient absorption changes, are compared with results from Finite Element Modeling (FEM) numerical computations, which allow assignment of the detected oscillating signals to fundamental radial and extensional modes. FEM was further used to analyze the effects of morphology and composition on the vibrational dynamics. FEM computations indicate that (1) the central distance between particles forming the nanodimers have profound effects on the extensional mode frequencies and a negligible influence on the radial mode ones, in analogy with the case of monometallic nanorods, (2) coating Au with Ag also has a strong mass-loading-like effect on the dimer and core-shell stretching mode frequency, while (3) its influence on the radial breathing mode is smaller and analogous to the non-monotonical frequency dependence on Au fraction previously observed in isotropic bimetallic spheres. These findings are significant for developing a predictive understanding of nanostructure mechanical properties and for designing new mechanical nanoresonators.
ISSN: 1463-9076
DOI: 10.1039/D0CP03260C
Schools: School of Physical and Mathematical Sciences 
Rights: © 2020 The Owner Societies. All rights reserved. This paper was published by Royal Society of Chemistry in Physical Chemistry Chemical Physics and is made available with permission of The Owner Societies.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

Files in This Item:
File Description SizeFormat 
2021_PhysChemChemPhys.pdf1.17 MBAdobe PDFThumbnail

Citations 50

Updated on May 29, 2023

Web of ScienceTM
Citations 50

Updated on Jun 1, 2023

Page view(s)

Updated on Jun 1, 2023

Download(s) 50

Updated on Jun 1, 2023

Google ScholarTM




Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.