Ultrafast acoustic vibrations of Au-Ag nanoparticles with varying elongated structures

doi:10.1039/d0cp03260c

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	Ultrafast acoustic vibrations of Au-Ag nanoparticles with varying elongated structures
	X. Zhao; Z. G. Nie; Y. H. Feng; W. R. Zhao; J. H. Zhang; W. C. Zhang; P. Maioli and Z. H. Loh
	2020
发表期刊	Physical Chemistry Chemical Physics
ISSN	1463-9076
卷号	22 期号:39 页码:22728-22735
摘要	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 the results obtained 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 has 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-monotonic frequency dependence on the 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.
DOI	10.1039/d0cp03260c
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收录类别	SCI ; EI
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/64986
专题	中国科学院长春光学精密机械与物理研究所
推荐引用方式 GB/T 7714	X. Zhao,Z. G. Nie,Y. H. Feng,et al. Ultrafast acoustic vibrations of Au-Ag nanoparticles with varying elongated structures[J]. Physical Chemistry Chemical Physics,2020,22(39):22728-22735.
APA	X. Zhao.,Z. G. Nie.,Y. H. Feng.,W. R. Zhao.,J. H. Zhang.,...&P. Maioli and Z. H. Loh.(2020).Ultrafast acoustic vibrations of Au-Ag nanoparticles with varying elongated structures.Physical Chemistry Chemical Physics,22(39),22728-22735.
MLA	X. Zhao,et al."Ultrafast acoustic vibrations of Au-Ag nanoparticles with varying elongated structures".Physical Chemistry Chemical Physics 22.39(2020):22728-22735.

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