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Acoustic Vibration Modes of Gold–Silver Core–Shell Nanoparticles. CHEMOSENSORS 2022. [DOI: 10.3390/chemosensors10050193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Bimetallic Au/Ag core–shell cuboid nanoparticles (NPs) exhibit a complex plasmonic response dominated by a dipolar longitudinal mode and higher-order transverse modes in the near-UV, which may be exploited for a range of applications. In this paper, we take advantage of the strong signature of these modes in the NP ultrafast transient optical response, measured by pump-probe transient absorption (TA) spectroscopy, to explore the NP vibrational landscape. The fast Fourier transform analysis of the TA dynamics reveals specific vibration modes in the frequency range 15–150 GHz, further studied by numerical simulations based on the finite element method. While bare Au nanorods exhibit extensional and breathing modes, the bimetallic NPs undergo more complex motions, involving the displacement of facets, edges and corners. The amplitude and frequency of these modes are shown to depend on the Ag shell thickness, as the silver load modifies the NP aspect ratio and mass. Moreover, the contributions of the vibrational modes to the experimental TA spectra are shown to vary with the probe laser wavelength at which the signal is monitored. Using the combined simulations of the NP elastic and optical properties, we elucidate this influence by analyzing the effect of the mechanisms involved in the acousto-plasmonic coupling.
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Zhao X, Nie Z, Feng Y, Zhao W, Zhang J, Zhang W, Maioli P, Loh ZH. Ultrafast acoustic vibrations of Au-Ag nanoparticles with varying elongated structures. Phys Chem Chem Phys 2020; 22:22728-22735. [PMID: 33016284 DOI: 10.1039/d0cp03260c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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 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.
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Affiliation(s)
- Xin Zhao
- School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, Guangdong, China.
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Engelbrekt C, Crampton KT, Fishman DA, Law M, Apkarian VA. Efficient Plasmon-Mediated Energy Funneling to the Surface of Au@Pt Core-Shell Nanocrystals. ACS NANO 2020; 14:5061-5074. [PMID: 32167744 DOI: 10.1021/acsnano.0c01653] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The structure and ultrafast photodynamics of ∼8 nm Au@Pt core-shell nanocrystals with ultrathin (<3 atomic layers) Pt-Au alloy shells are investigated to show that they meet the design principles for efficient bimetallic plasmonic photocatalysis. Photoelectron spectra recorded at two different photon energies are used to determine the radial concentration profile of the Pt-Au shell and the electron density near the Fermi energy, which play a key role in plasmon damping and electronic and thermal conductivity. Transient absorption measurements track the flow of energy from the plasmonic core to the electronic manifold of the Pt shell and back to the lattice of the core in the form of heat. We show that strong coupling to the high density of Pt(d) electrons at the Fermi level leads to accelerated dephasing of the Au plasmon on the femtosecond time scale, electron-electron energy transfer from Au(sp) core electrons to Pt(d) shell electrons on the sub-picosecond time scale, and enhanced thermal resistance on the 50 ps time scale. Electron-electron scattering efficiently funnels hot carriers into the ultrathin catalytically active shell at the nanocrystal surface, making them available to drive chemical reactions before losing energy to the lattice via electron-phonon scattering on the 2 ps time scale. The combination of strong broadband light absorption, enhanced electromagnetic fields at the catalytic metal sites, and efficient delivery of hot carriers to the catalyst surface makes core-shell nanocrystals with plasmonic metal cores and ultrathin catalytic metal shells promising nanostructures for the realization of high-efficiency plasmonic catalysts.
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Affiliation(s)
- Christian Engelbrekt
- Department of Chemistry, University of California Irvine, Irvine, California 92697, United States
- Department of Chemistry, Technical University of Denmark, Kongens Lyngby, 2800, Denmark
| | - Kevin T Crampton
- Department of Chemistry, University of California Irvine, Irvine, California 92697, United States
| | - Dmitry A Fishman
- Department of Chemistry, University of California Irvine, Irvine, California 92697, United States
| | - Matt Law
- Department of Chemistry, University of California Irvine, Irvine, California 92697, United States
| | - Vartkess Ara Apkarian
- Department of Chemistry, University of California Irvine, Irvine, California 92697, United States
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Yu S, Zhang J, Tang Y, Ouyang M. Engineering Acoustic Phonons and Electron-Phonon Coupling by the Nanoscale Interface. NANO LETTERS 2015; 15:6282-6288. [PMID: 26313532 DOI: 10.1021/acs.nanolett.5b03227] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Precise engineering of phonon-phonon (ph-ph) and electron-phonon (e-ph) interactions by materials design is essential for an in-depth understanding of thermal, electrical, and optical phenomena as well as new technology breakthrough governed by fundamental physical laws. Due to their characteristic length scale, the ph-ph and e-ph interactions can be dramatically modified by nanoscale spatial confinement, thus opening up opportunities to finely maneuver underlying coupling processes through the interplay of confined size, fundamental length scale, and interface. We have combined ultrafast optical spectroscopy with a series of well-designed nanoscale core-shell structures possessing precisely tunable interface to demonstrate for the first time unambiguous experimental evidence of coherent interfacial phonon coupling between the core and shell constituents. Such interfacially coupled phonons can be impulsively excited through the e-ph interaction, in which the critical e-ph coupling constant is further shown to be monotonically controlled by tuning the configuration and constituent of core-shell nanostructure. Precise tunability of elemental physics processes through nanoscale materials engineering should not only offer fundamental insights into different materials properties but also facilitate design of devices possessing desirable functionality and property with rationally tailored nanostructures as building blocks.
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Affiliation(s)
- Shangjie Yu
- Department of Physics and Center for Nanophysics and Advanced Materials and ‡Department of Electrical and Computer Engineering, University of Maryland , College Park, Maryland 20742, United States
| | - Jiatao Zhang
- Department of Physics and Center for Nanophysics and Advanced Materials and ‡Department of Electrical and Computer Engineering, University of Maryland , College Park, Maryland 20742, United States
| | - Yun Tang
- Department of Physics and Center for Nanophysics and Advanced Materials and ‡Department of Electrical and Computer Engineering, University of Maryland , College Park, Maryland 20742, United States
| | - Min Ouyang
- Department of Physics and Center for Nanophysics and Advanced Materials and ‡Department of Electrical and Computer Engineering, University of Maryland , College Park, Maryland 20742, United States
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Crut A, Maioli P, Del Fatti N, Vallée F. Time-domain investigation of the acoustic vibrations of metal nanoparticles: size and encapsulation effects. ULTRASONICS 2015; 56:98-108. [PMID: 24656934 DOI: 10.1016/j.ultras.2014.02.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2013] [Accepted: 02/13/2014] [Indexed: 06/03/2023]
Abstract
The acoustic vibrations of single-metal and multi-material nanoparticles are studied by ultrafast pump-probe optical spectroscopy and described in the context of the continuous elastic model. The applicability of this model to the small size range, down to one nanometer, is discussed in the light of recent experimental data and ab initio calculations. Investigations of multi-material nano-objects stress the impact of the intra-particle interface on the characteristics of their vibrational modes, also yielding information on the composition and spatial distribution of the constituting materials.
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Affiliation(s)
- Aurélien Crut
- FemtoNanoOptics Group, Institut Lumière Matière UMR5306, Université Lyon 1-CNRS, 69622 Villeurbanne, France.
| | - Paolo Maioli
- FemtoNanoOptics Group, Institut Lumière Matière UMR5306, Université Lyon 1-CNRS, 69622 Villeurbanne, France
| | - Natalia Del Fatti
- FemtoNanoOptics Group, Institut Lumière Matière UMR5306, Université Lyon 1-CNRS, 69622 Villeurbanne, France
| | - Fabrice Vallée
- FemtoNanoOptics Group, Institut Lumière Matière UMR5306, Université Lyon 1-CNRS, 69622 Villeurbanne, France
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Major TA, Lo SS, Yu K, Hartland GV. Time-Resolved Studies of the Acoustic Vibrational Modes of Metal and Semiconductor Nano-objects. J Phys Chem Lett 2014; 5:866-874. [PMID: 26274080 DOI: 10.1021/jz4027248] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Over the past decade, there have been a number of transient absorption studies of the acoustic vibrational modes of metal and semiconductor nanoparticles. This Perspective provides an overview of this work. The way that the frequencies of the observed modes depend on the size and shape of the particles is described, along with their damping. Future research directions are also discussed, especially how these measurements provide information about the way nano-objects interact with their environment.
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Affiliation(s)
- Todd A Major
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556-5670, United States
| | - Shun Shang Lo
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556-5670, United States
| | - Kuai Yu
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556-5670, United States
| | - Gregory V Hartland
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556-5670, United States
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Yu K, Sader JE, Zijlstra P, Hong M, Xu QH, Orrit M. Probing silver deposition on single gold nanorods by their acoustic vibrations. NANO LETTERS 2014; 14:915-922. [PMID: 24422602 DOI: 10.1021/nl404304h] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Acoustic vibrations of single gold nanorods coated with silver were investigated. We used single-particle pump-probe spectroscopy to monitor the silver deposition through the particle vibrations. Two vibration modes, the breathing mode and extensional mode, are observed, and the vibrational frequencies are measured as functions of the amount of silver deposited on single gold nanorods. The breathing mode frequency was found to decrease with silver deposition, while the extensional mode frequency was almost constant for silver shells up to 6 nm. The frequency changes agree with a model based on continuum mechanics and on the assumption of a uniform silver coating. The quality factors for the breathing mode and the extensional mode are hardly affected by silver deposition, indicating that the introduced interface between gold and silver contributes negligibly to the damping of the particle vibrations. Finally, we demonstrated that an atomic layer of silver can be detected using the particle acoustic vibrations.
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Affiliation(s)
- Kuai Yu
- Institute of Physics, Leiden University , Rapenburg 70, 2311 EZ Leiden, The Netherlands
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Cardinal MF, Mongin D, Crut A, Maioli P, Rodríguez-González B, Pérez-Juste J, Liz-Marzán LM, Del Fatti N, Vallée F. Acoustic Vibrations in Bimetallic Au@Pd Core-Shell Nanorods. J Phys Chem Lett 2012; 3:613-619. [PMID: 26286157 DOI: 10.1021/jz3000992] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The acoustic vibrations of gold nanorods coated with palladium were investigated as a function of Pd amount using ultrafast pump-probe spectroscopy. Both the extensional and breathing vibrational modes of the nanorods were coherently excited and detected. This permits precise determination of their periods, which were found to decrease and increase with Pd deposition, for the extensional and vibrational modes, respectively. These opposite behaviors reflect changes of the nanoparticle size and mechanical properties, in agreement with numerical simulations. Comparison of experimental and computed periods yields information on the amount of deposited Pd, providing a novel tool to characterize bicomponent nano-objects for small fractions of one of the components (Pd/Au atomic fraction down to 5%).
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Affiliation(s)
- M Fernanda Cardinal
- †Departamento de Quimica Fisica, Universidade de Vigo, 36310 Vigo, Spain
- ‡International Iberian Nanotechnology Laboratory, Braga, 4710229, Portugal
| | - Denis Mongin
- §FemtoNanoOptics Group, Université Lyon 1, CNRS, LASIM, 43 Bd du 11 Novembre, 69622 Villeurbanne, France
| | - Aurélien Crut
- §FemtoNanoOptics Group, Université Lyon 1, CNRS, LASIM, 43 Bd du 11 Novembre, 69622 Villeurbanne, France
| | - Paolo Maioli
- §FemtoNanoOptics Group, Université Lyon 1, CNRS, LASIM, 43 Bd du 11 Novembre, 69622 Villeurbanne, France
| | | | - Jorge Pérez-Juste
- †Departamento de Quimica Fisica, Universidade de Vigo, 36310 Vigo, Spain
| | - Luis M Liz-Marzán
- †Departamento de Quimica Fisica, Universidade de Vigo, 36310 Vigo, Spain
| | - Natalia Del Fatti
- §FemtoNanoOptics Group, Université Lyon 1, CNRS, LASIM, 43 Bd du 11 Novembre, 69622 Villeurbanne, France
| | - Fabrice Vallée
- §FemtoNanoOptics Group, Université Lyon 1, CNRS, LASIM, 43 Bd du 11 Novembre, 69622 Villeurbanne, France
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Mongin D, Juvé V, Maioli P, Crut A, Del Fatti N, Vallée F, Sánchez-Iglesias A, Pastoriza-Santos I, Liz-Marzán LM. Acoustic vibrations of metal-dielectric core-shell nanoparticles. NANO LETTERS 2011; 11:3016-3021. [PMID: 21688851 DOI: 10.1021/nl201672k] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The acoustic vibrations of metal nanoparticles encapsulated in a dielectric shell (Ag@SiO(2)) were investigated using a time-resolved femtosecond technique. The measured vibration periods significantly differ from those predicted for the bare metal cores and, depending on the relative core and shell sizes, were found to be either larger or smaller than them. These results show that the vibration of the whole core-shell particle is excited and detected. Moreover, vibrational periods are in excellent agreement with the predictions of a model based on continuum thermoelasticity. However, such agreement is obtained only if a good mechanical contact of the metal and dielectric parts of the core-shell particle is assumed, providing a unique way to probe this contact in multimaterial or hybrid nano-objects.
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Affiliation(s)
- Denis Mongin
- FemtoNanoOptics group, LASIM, Université Lyon 1-CNRS, 43 Bd du 11 Novembre, 69622 Villeurbanne, France
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Affiliation(s)
- Gregory V. Hartland
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556-5670, United States
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Wang L, Kiya A, Okuno Y, Niidome Y, Tamai N. Ultrafast spectroscopy and coherent acoustic phonons of Au–Ag core–shell nanorods. J Chem Phys 2011; 134:054501. [DOI: 10.1063/1.3533235] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Valamanesh M, Langlois C, Alloyeau D, Lacaze E, Ricolleau C. Combining moiré patterns and high resolution transmission electron microscopy for in-plane thin films thickness determination. Ultramicroscopy 2010; 111:149-54. [PMID: 21185459 DOI: 10.1016/j.ultramic.2010.10.017] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2010] [Revised: 08/02/2010] [Accepted: 10/29/2010] [Indexed: 11/30/2022]
Abstract
This paper reports the coupling of HRTEM and moiré pattern observations, allowing the determination of the thickness ratio of two superimposed crystals. Pseudo-lattice fringes are observed using identical TEM experimental conditions as for observing moiré patterns. The pseudo-lattice spacing is first calculated in the dynamical theory framework in two beam conditions. This approach shows a linear behavior of the spacing as a function of the thickness ratio of the two crystals. The roles of sample crystallographic orientation and sample thickness on the thickness ratio determination are discussed from multi-beam simulations. Finally, the method is applied on a bimetallic CuAg core-shell nanoparticle of a known structure. It is demonstrated that for this particle, the thickness ratio of Cu and Ag can be determined with an error that results in a precision less than 0.75 nm on the Cu and Ag thicknesses. The advantages of the technique are the use of an in-plane sample configuration and a single HRTEM image.
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Affiliation(s)
- M Valamanesh
- Laboratoire Matériaux et Phénomènes Quantiques, CNRS-UMR 7162, Université Paris Diderot--Paris 7, Case Courrier 7021, 75205 Paris Cedex 13, France
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Park TH, Nordlander P. On the nature of the bonding and antibonding metallic film and nanoshell plasmons. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.03.029] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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