1
|
Wright C, Hartland GV. Vibrational Anharmonicity and Energy Relaxation in Nanoscale Acoustic Resonators. NANO LETTERS 2023. [PMID: 37983138 DOI: 10.1021/acs.nanolett.3c03660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2023]
Abstract
The fundamental and n = 3 overtones of Au nanoplate thickness vibrations have been studied by transient absorption microscopy. The frequencies of the n = 3 overtone are less than 3× the frequency of the fundamental. This anharmonicity is explained through a continuum mechanics model that includes organic layers on top of the nanoplate and between the nanoplate and the glass substrate. In this model, anharmonicity arises from coupling between the vibrations of the nanoplate and the organic layers, which creates avoided crossings that reduce the overtone frequencies compared to the fundamental. Comparison of the experimental and calculated quality factors shows that coupling occurs to the top organic layer. Good agreement between the measured and calculated quality factors is obtained by introducing internal damping for the nanoplate. These results show that engineering layers of soft material around metal nanostructures can be used to control the vibrational lifetimes.
Collapse
Affiliation(s)
- Cameron Wright
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Gregory V Hartland
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| |
Collapse
|
2
|
Vernier C, Saviot L, Fan Y, Courty A, Portalès H. Sensitivity of Localized Surface Plasmon Resonance and Acoustic Vibrations to Edge Rounding in Silver Nanocubes. ACS NANO 2023; 17:20462-20472. [PMID: 37812521 DOI: 10.1021/acsnano.3c06990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/11/2023]
Abstract
Precise knowledge of the dependence of nano-object properties on their structural characteristics such as their size, shape, composition, or crystallinity, in turn, enables them to be finely characterized using appropriate techniques. Spectrophotometry and inelastic light scattering spectroscopy are noninvasive techniques that are proving highly robust and efficient for characterizing the optical response and vibrational properties of metal nano-objects. Here, we investigate the optical and vibrational properties of monodomain silver nanocubes synthesized by the chemical route, with edge length ranging from around 20 to 58 nm. The synthesized nanocrystals are not perfectly cubic and exhibit rounded edges and corners. This rounding was quantitatively taken into account by assimilating the shape of the nanocubes to superellipsoids. The effect of rounding on their optical response was clearly evidenced by localized surface plasmon resonance spectroscopy and supported by calculations based on the discrete dipole approximation method. The study of their acoustic vibrations by high-resolution low-frequency Raman scattering revealed a substructure of the T2g band, which was analyzed as a function of rounding. The measured frequencies are consistent with the existence of an anticrossing pattern of the two T2g branches. Such an avoided crossing in the T2g modes is clearly evidenced by calculating the vibrational frequencies of silver nanocubes using the Rayleigh-Ritz variational method that accounts for both their real size, shape, and cubic elasticity. These results show that it is possible to assess the rounding of nanocubes, including by means of ensemble spectroscopic measurements on well-calibrated particles.
Collapse
Affiliation(s)
- Charles Vernier
- Sorbonne Université, CNRS, MONARIS, UMR 8233, Paris 75005, France
| | - Lucien Saviot
- Laboratoire Interdisciplinaire Carnot de Bourgogne, UMR 6303 CNRS, Université Bourgogne Franche-Comté, Dijon CEDEX 21078, France
| | - Yinan Fan
- Sorbonne Université, CNRS, MONARIS, UMR 8233, Paris 75005, France
| | - Alexa Courty
- Sorbonne Université, CNRS, MONARIS, UMR 8233, Paris 75005, France
| | - Hervé Portalès
- Sorbonne Université, CNRS, MONARIS, UMR 8233, Paris 75005, France
| |
Collapse
|
3
|
Castillo López de Larrinzar B, Xiang C, Cardozo de Oliveira ER, Lanzillotti-Kimura ND, García-Martín A. Towards chiral acoustoplasmonics. NANOPHOTONICS 2023; 12:1957-1964. [PMID: 37215944 PMCID: PMC10193267 DOI: 10.1515/nanoph-2022-0780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Accepted: 04/14/2023] [Indexed: 05/24/2023]
Abstract
The possibility of creating and manipulating nanostructured materials encouraged the exploration of new strategies to control electromagnetic properties. Among the most intriguing nanostructures are those that respond differently to helical polarization, i.e., exhibit chirality. Here, we present a simple structure based on crossed elongated bars where light-handedness defines the dominating cross-section absorption or scattering, with a 200 % difference from its counterpart (scattering or absorption). The proposed chiral system opens the way to enhanced coherent phonon excitation and detection. We theoretically propose a simple coherent phonon generation (time-resolved Brillouin scattering) experiment using circularly polarized light. In the reported structures, the generation of acoustic phonons is optimized by maximizing the absorption, while the detection is enhanced at the same wavelength and different helicity by engineering the scattering properties. The presented results constitute one of the first steps towards harvesting chirality effects in the design and optimization of efficient and versatile acoustoplasmonic transducers.
Collapse
Affiliation(s)
| | - Chushuang Xiang
- CNRS, Centre de Nanosciences et de Nanotechnologies, Université Paris-Saclay, 10 Boulevard Thomas Gobert, Palaiseau91120, France
| | - Edson Rafael Cardozo de Oliveira
- CNRS, Centre de Nanosciences et de Nanotechnologies, Université Paris-Saclay, 10 Boulevard Thomas Gobert, Palaiseau91120, France
| | | | - Antonio García-Martín
- Instituto de Micro y Nanotecnología IMN-CNM, CSIC, CEI UAM + CSIC, Isaac Newton 8, Tres Cantos, Madrid28760, Spain
| |
Collapse
|
4
|
Bykov AY, Xie Y, Krasavin AV, Zayats AV. Broadband Transient Response and Wavelength-Tunable Photoacoustics in Plasmonic Hetero-nanoparticles. NANO LETTERS 2023; 23:2786-2791. [PMID: 36926927 PMCID: PMC10103169 DOI: 10.1021/acs.nanolett.3c00063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Revised: 03/06/2023] [Indexed: 06/18/2023]
Abstract
The optically driven acoustic modes and nonlinear response of plasmonic nanoparticles are important in many applications, but are strongly resonant, which restricts their excitation to predefined wavelengths. Here, we demonstrate that multilayered spherical plasmonic hetero-nanoparticles, formed by alternating layers of gold and silica, provide a platform for a broadband nonlinear optical response from visible to near-infrared wavelengths. They also act as a tunable optomechanical system with mechanically decoupled layers in which different acoustic modes can be selectively switched on/off by tuning the excitation wavelength. These observations not only expand the knowledge about the internal structure of composite plasmonic nanoparticles but also allow for an additional degree of freedom for controlling their nonlinear optical and mechanical properties.
Collapse
|
5
|
Shen SS, Yao J, Zhang WX, Wu DJ. Characterizing core-shell nanostructures through photoacoustic response based on theoretical model in the frequency domain. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2022; 151:2649. [PMID: 35461489 DOI: 10.1121/10.0010259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Accepted: 03/31/2022] [Indexed: 06/14/2023]
Abstract
Core-shell nanostructures are widely used, and their photoacoustic (PA) properties are important for applications. However, the relations between their structural parameters and the properties of the PA spectrum are indirect because most theoretical models have been reported for them in the time domain. In this study, we develop a complete model in the frequency domain to analyze the PA response of core-shell particles. As in the case of solid spheres, the core-shell particles have pronounced resonant modes. The PA mode varies with the thickness of the shell and the radius of the core. Under single-pulse irradiation, PA signals of gold-silica nanospheres obtained by our theory agreed with those of the theory in the time domain and experiments. Under multi-pulse irradiation, the magnitude of the PA signals peaked whether the repeated excitation itself or its harmonic was equal to the PA mode. The structure could thus be monitored by the PA signals. These findings enrich PA theory and may inspire new techniques for the noninvasive characterization of nanoparticles.
Collapse
Affiliation(s)
- Si-Si Shen
- Jiangsu Key Lab of Opto-Electronic Technology, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China
| | - Jie Yao
- Jiangsu Key Lab of Opto-Electronic Technology, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China
| | - Wei-Xuan Zhang
- Jiangsu Key Lab of Opto-Electronic Technology, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China
| | - Da-Jian Wu
- Jiangsu Key Lab of Opto-Electronic Technology, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China
| |
Collapse
|
6
|
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.
Collapse
Affiliation(s)
- Xin Zhao
- School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, Guangdong, China.
| | | | | | | | | | | | | | | |
Collapse
|
7
|
Maioli P, Stoll T, Sauceda HE, Valencia I, Demessence A, Bertorelle F, Crut A, Vallée F, Garzón IL, Cerullo G, Del Fatti N. Mechanical Vibrations of Atomically Defined Metal Clusters: From Nano- to Molecular-Size Oscillators. NANO LETTERS 2018; 18:6842-6849. [PMID: 30247927 DOI: 10.1021/acs.nanolett.8b02717] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Acoustic vibrations of small nanoparticles are still ruled by continuum mechanics laws down to diameters of a few nanometers. The elastic behavior at lower sizes (<1-2 nm), where nanoparticles become molecular clusters made by few tens to few atoms, is still little explored. The question remains to which extent the transition from small continuous-mass solids to discrete-atom molecular clusters affects their specific low-frequency vibrational modes, whose period is classically expected to linearly scale with diameter. Here, we investigate experimentally by ultrafast time-resolved optical spectroscopy the acoustic response of atomically defined ligand-protected metal clusters Au n(SR) m with a number n of atoms ranging from 10 to 102 (0.5-1.5 nm diameter range). Two periods, corresponding to fundamental breathing- and quadrupolar-like acoustic modes, are detected, with the latter scaling linearly with cluster diameters and the former taking a constant value. Theoretical calculations based on density functional theory (DFT) predict in the case of bare clusters vibrational periods scaling with size down to diatomic molecules. For ligand-protected clusters, they show a pronounced effect of the ligand molecules on the breathing-like mode vibrational period at the origin of its constant value. This deviation from classical elasticity predictions results from mechanical mass-loading effects due to the protecting layer. This study shows that clusters characteristic vibrational frequencies are compatible with extrapolation of continuum mechanics model down to few atoms, which is in agreement with DFT computations.
Collapse
Affiliation(s)
- Paolo Maioli
- Institut Lumière Matière , Université de Lyon, CNRS, Université Claude Bernard Lyon 1 , F-69622 Villeurbanne , France
| | - Tatjana Stoll
- Institut Lumière Matière , Université de Lyon, CNRS, Université Claude Bernard Lyon 1 , F-69622 Villeurbanne , France
- Dipartimento di Fisica, Politecnico di Milano , IFN-CNR , Piazza L. da Vinci 32 , I-20133 Milano , Italy
| | - Huziel E Sauceda
- Fritz-Haber-Institute der Max-Planck-Gesellschaft , 14195 Berlin , Germany
| | - Israel Valencia
- Facultad de Estudios Superiores-Iztacala , Universidad Nacional Autónoma de México , 54090 Tlanepantla , Estado de México México
| | - Aude Demessence
- Institut de Recherches sur la Catalyse et l'Environnement de Lyon (IRCELYON) , Université de Lyon, CNRS, Université Claude Bernard Lyon 1 , F-69622 Villeurbanne , France
| | - Franck Bertorelle
- Institut Lumière Matière , Université de Lyon, CNRS, Université Claude Bernard Lyon 1 , F-69622 Villeurbanne , France
| | - Aurélien Crut
- Institut Lumière Matière , Université de Lyon, CNRS, Université Claude Bernard Lyon 1 , F-69622 Villeurbanne , France
| | - Fabrice Vallée
- Institut Lumière Matière , Université de Lyon, CNRS, Université Claude Bernard Lyon 1 , F-69622 Villeurbanne , France
| | - Ignacio L Garzón
- Instituto de Física , Universidad Nacional Autónoma de México , Apartado Postal 20-364, 01000 CDMX , México
| | - Giulio Cerullo
- Dipartimento di Fisica, Politecnico di Milano , IFN-CNR , Piazza L. da Vinci 32 , I-20133 Milano , Italy
| | - Natalia Del Fatti
- Institut Lumière Matière , Université de Lyon, CNRS, Université Claude Bernard Lyon 1 , F-69622 Villeurbanne , France
| |
Collapse
|
8
|
Fuentes-Domínguez R, Pérez-Cota F, Naznin S, Smith RJ, Clark M. Super-resolution imaging using nano-bells. Sci Rep 2018; 8:16373. [PMID: 30401881 PMCID: PMC6219565 DOI: 10.1038/s41598-018-34744-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Accepted: 10/12/2018] [Indexed: 11/25/2022] Open
Abstract
In this paper we demonstrate a new scheme for optical super-resolution, inspired, in-part, by PALM and STORM. In this scheme each object in the field of view is tagged with a signal that allows them to be detected separately. By doing this we can identify and locate each object separately with significantly higher resolution than the diffraction limit. We demonstrate this by imaging nanoparticles significantly smaller than the optical resolution limit. In this case the "tag" we have used is the frequency of vibration of nanoscale "bells" made of metallic nanoparticles whose acoustic vibrational frequency is in the multi-GHz range. Since the vibration of the particles can be easily excited and detected and the frequency is directly related to the particle size, we can separate the signals from many particles of sufficiently different sizes even though they are smaller than, and separated by less than, the optical resolution limit. Using this scheme we have been able to localise the nanoparticle position with a precision of ~3 nm. This has many potential advantages - such nanoparticles are easily inserted into cells and well tolerated, the particles do not bleach and can be produced easily with very dispersed sizes. We estimate that 50 or more different particles (or frequency channels) can be accessed in each optical point spread function using the vibrational frequencies of gold nanospheres. However, many more channels may be accessed using more complex structures (such as nanorods) and detection techniques (for instance using polarization or wavelength selective detection) opening up this technique as a generalized method of achieving super-optical resolution imaging.
Collapse
Affiliation(s)
| | - Fernando Pérez-Cota
- Optics and Photonics Group, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Shakila Naznin
- Optics and Photonics Group, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Richard J Smith
- Optics and Photonics Group, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Matt Clark
- Optics and Photonics Group, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| |
Collapse
|
9
|
Medeghini F, Crut A, Gandolfi M, Rossella F, Maioli P, Vallée F, Banfi F, Del Fatti N. Controlling the Quality Factor of a Single Acoustic Nanoresonator by Tuning its Morphology. NANO LETTERS 2018; 18:5159-5166. [PMID: 29989822 DOI: 10.1021/acs.nanolett.8b02096] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The mechanical vibrations of individual gold nanodisks nanopatterned on a sapphire substrate are investigated using ultrafast time-resolved optical spectroscopy. The number and characteristics of the detected acoustic modes are found to vary with nanodisk geometry. In particular, their quality factors strongly depend on nanodisk aspect ratio (i.e., diameter over height ratio), reaching a maximal value of ≈70, higher than those previously measured for substrate-supported nano-objects. The peculiarities of the detected acoustic vibrations are confirmed by finite-element simulations, and interpreted as the result of substrate-induced hybridization between the vibrational modes of a nanodisk. The present findings demonstrate novel possibilities for engineering the vibrational modes of nano-objects.
Collapse
Affiliation(s)
- Fabio Medeghini
- FemtoNanoOptics Group , Université de Lyon, CNRS, Université Claude Bernard Lyon 1, Institut Lumière Matière , F-69622 Villeurbanne , France
| | - Aurélien Crut
- FemtoNanoOptics Group , Université de Lyon, CNRS, Université Claude Bernard Lyon 1, Institut Lumière Matière , F-69622 Villeurbanne , France
| | - Marco Gandolfi
- Interdisciplinary Laboratories for Advanced Materials Physics (I-LAMP) , Università Cattolica del Sacro Cuore , Brescia I-25121 , Italy
- Dipartimento di Matematica e Fisica , Università Cattolica del Sacro Cuore , Brescia I-25121 , Italy
- Laboratory of Soft Matter and Biophysics, Department of Physics and Astronomy , KU Leuven , Celestijnenlaan 200D , B-3001 Heverlee, Leuven , Belgium
| | - Francesco Rossella
- NEST, Scuola Normale Superiore and Istituto Nanoscienze-CNR , Piazza S. Silvestro 12 , I-56124 Pisa , Italy
| | - Paolo Maioli
- FemtoNanoOptics Group , Université de Lyon, CNRS, Université Claude Bernard Lyon 1, Institut Lumière Matière , F-69622 Villeurbanne , France
| | - Fabrice Vallée
- FemtoNanoOptics Group , Université de Lyon, CNRS, Université Claude Bernard Lyon 1, Institut Lumière Matière , F-69622 Villeurbanne , France
| | - Francesco Banfi
- Interdisciplinary Laboratories for Advanced Materials Physics (I-LAMP) , Università Cattolica del Sacro Cuore , Brescia I-25121 , Italy
| | - Natalia Del Fatti
- FemtoNanoOptics Group , Université de Lyon, CNRS, Université Claude Bernard Lyon 1, Institut Lumière Matière , F-69622 Villeurbanne , France
| |
Collapse
|
10
|
Yi C, Su MN, Dongare PD, Chakraborty D, Cai YY, Marolf DM, Kress RN, Ostovar B, Tauzin LJ, Wen F, Chang WS, Jones MR, Sader JE, Halas NJ, Link S. Polycrystallinity of Lithographically Fabricated Plasmonic Nanostructures Dominates Their Acoustic Vibrational Damping. NANO LETTERS 2018; 18:3494-3501. [PMID: 29715035 DOI: 10.1021/acs.nanolett.8b00559] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The study of acoustic vibrations in nanoparticles provides unique and unparalleled insight into their mechanical properties. Electron-beam lithography of nanostructures allows precise manipulation of their acoustic vibration frequencies through control of nanoscale morphology. However, the dissipation of acoustic vibrations in this important class of nanostructures has not yet been examined. Here we report, using single-particle ultrafast transient extinction spectroscopy, the intrinsic damping dynamics in lithographically fabricated plasmonic nanostructures. We find that in stark contrast to chemically synthesized, monocrystalline nanoparticles, acoustic energy dissipation in lithographically fabricated nanostructures is solely dominated by intrinsic damping. A quality factor of Q = 11.3 ± 2.5 is observed for all 147 nanostructures, regardless of size, geometry, frequency, surface adhesion, and mode. This result indicates that the complex Young's modulus of this material is independent of frequency with its imaginary component being approximately 11 times smaller than its real part. Substrate-mediated acoustic vibration damping is strongly suppressed, despite strong binding between the glass substrate and Au nanostructures. We anticipate that these results, characterizing the optomechanical properties of lithographically fabricated metal nanostructures, will help inform their design for applications such as photoacoustic imaging agents, high-frequency resonators, and ultrafast optical switches.
Collapse
Affiliation(s)
- Chongyue Yi
- Department of Chemistry , Rice University , Houston , Texas 77005 , United States
| | - Man-Nung Su
- Department of Chemistry , Rice University , Houston , Texas 77005 , United States
| | - Pratiksha D Dongare
- Applied Physics Graduate Program , Rice University , Houston , Texas 77005 , United States
- Department of Electrical and Computer Engineering , Rice University , Houston , Texas 77005 , United States
| | - Debadi Chakraborty
- ARC Centre of Excellence in Exciton Science, School of Mathematics and Statistics , The University of Melbourne , Parkville , VIC 3010 , Australia
| | - Yi-Yu Cai
- Department of Chemistry , Rice University , Houston , Texas 77005 , United States
| | - David M Marolf
- Department of Chemistry , Rice University , Houston , Texas 77005 , United States
| | - Rachael N Kress
- Department of Chemistry , Rice University , Houston , Texas 77005 , United States
| | - Behnaz Ostovar
- Department of Chemistry , Rice University , Houston , Texas 77005 , United States
| | - Lawrence J Tauzin
- Department of Chemistry , Rice University , Houston , Texas 77005 , United States
| | - Fangfang Wen
- Department of Chemistry , Rice University , Houston , Texas 77005 , United States
| | - Wei-Shun Chang
- Department of Chemistry , Rice University , Houston , Texas 77005 , United States
| | - Matthew R Jones
- Department of Chemistry , Rice University , Houston , Texas 77005 , United States
| | - John E Sader
- ARC Centre of Excellence in Exciton Science, School of Mathematics and Statistics , The University of Melbourne , Parkville , VIC 3010 , Australia
| | - Naomi J Halas
- Department of Chemistry , Rice University , Houston , Texas 77005 , United States
- Department of Electrical and Computer Engineering , Rice University , Houston , Texas 77005 , United States
- Department of Physics and Astronomy , Rice University , Houston , Texas 77005 , United States
- Laboratory for Nanophotonics , Rice University , Houston , Texas 77005 , United States
| | - Stephan Link
- Department of Chemistry , Rice University , Houston , Texas 77005 , United States
- Department of Electrical and Computer Engineering , Rice University , Houston , Texas 77005 , United States
- Laboratory for Nanophotonics , Rice University , Houston , Texas 77005 , United States
| |
Collapse
|
11
|
Size Characterisation Method and Detection Enhancement of Plasmonic Nanoparticles in a Pump–Probe System. APPLIED SCIENCES-BASEL 2017. [DOI: 10.3390/app7080819] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
12
|
Xiang D, Wu J, Rottler J, Gordon R. Threshold for Terahertz Resonance of Nanoparticles in Water. NANO LETTERS 2016; 16:3638-3641. [PMID: 27203117 DOI: 10.1021/acs.nanolett.6b00770] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Nanoparticle vibrations are coupled to light through electrostriction, which gives nonlinear optical scattering. We investigated the acoustic response of 2 nm gold nanoparticles using a nearly degenerate four-wave mixing experimental configuration and show that the nonlinear response suddenly turns on at low powers (<100 mW) for continuous-wave (CW) lasers. The observed nonlinear response is a million times larger than typical electronic nonlinearities. The threshold implies a dramatic change in the quality factor of the vibrating nanoparticles, 4 orders of magnitude larger than usual hydrodynamic theory predicts. It is as if the water is removed altogether, which we speculate is the result of the vibrating particle pushing away the water molecules to form a stable cavity. Because these acoustic vibrations extend to terahertz frequencies, there is potential to harness this effect for high speed optical data processing, as well as to probe the dynamics of proteins all having acoustic modes in this range.
Collapse
Affiliation(s)
- Dao Xiang
- Department Electrical and Computer Engineering, University of Victoria , Victoria, British Columbia V8P 5C2, Canada
| | - Jian Wu
- Department Electrical and Computer Engineering, University of Victoria , Victoria, British Columbia V8P 5C2, Canada
| | - Jörg Rottler
- Department of Physics and Astronomy, University of British Columbia , Vancouver, British Columbia V6T 1Z1, Canada
| | - Reuven Gordon
- Department Electrical and Computer Engineering, University of Victoria , Victoria, British Columbia V8P 5C2, Canada
| |
Collapse
|
13
|
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.
Collapse
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
| |
Collapse
|
14
|
Laser-induced transformation of supramolecular complexes: approach to controlled formation of hybrid multi-yolk-shell Au-Ag@a-C:H nanostructures. Sci Rep 2015; 5:12027. [PMID: 26153347 PMCID: PMC4495562 DOI: 10.1038/srep12027] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2015] [Accepted: 06/11/2015] [Indexed: 11/10/2022] Open
Abstract
In the present work an efficient approach of the controlled formation of hybrid Au–Ag–C nanostructures based on laser-induced transformation of organometallic supramolecular cluster compound is suggested. Herein the one-step process of the laser-induced synthesis of hybrid multi-yolk-shell Au-Ag@a-C:H nanoparticles which are bimetallic gold-silver subnanoclusters dispersed in nanospheres of amorphous hydrogenated a-C:H carbon is reported in details. It has been demonstrated that variation of the experimental parameters such as type of the organometallic precursor, solvent, deposition geometry and duration of laser irradiation allows directed control of nanoparticles’ dimension and morphology. The mechanism of Au-Ag@a-C:H nanoparticles formation is suggested: the photo-excitation of the precursor molecule through metal-to-ligand charge transfer followed by rupture of metallophilic bonds, transformation of the cluster core including red-ox intramolecular reaction and aggregation of heterometallic species that results in the hybrid metal/carbon nanoparticles with multi-yolk-shell architecture formation. It has been found that the nanoparticles obtained can be efficiently used for the Surface-Enhanced Raman Spectroscopy label-free detection of human serum albumin in low concentration solution.
Collapse
|
15
|
Povolotskaya AV, Povolotskiy AV, Manshina AA. Hybrid nanostructures: synthesis, morphology and functional properties. RUSSIAN CHEMICAL REVIEWS 2015. [DOI: 10.1070/rcr4487] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
16
|
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.
Collapse
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
| |
Collapse
|
17
|
Smith RJ, Cota FP, Marques L, Chen X, Arca A, Webb K, Aylott J, Somekh MG, Clark M. Optically excited nanoscale ultrasonic transducers. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2015; 137:219-27. [PMID: 25618053 DOI: 10.1121/1.4904487] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
In order to work at higher ultrasonic frequencies, for instance, to increase the resolution, it is necessary to fabricate smaller and higher frequency transducers. This paper presents an ultrasonic transducer capable of being made at a very small size and operated at GHz frequencies. The transducers are activated and read optically using pulsed lasers and without physical contact between the instrumentation and the transducer. This removes some of the practical impediments of traditional piezoelectric architectures (such as wiring) and allows the devices to be placed immediately on or within samples, reducing the significant effect of attenuation which is very strong at frequencies above 1 GHz. The transducers presented in this paper exploit simultaneous optical and mechanical resonances to couple the optical input into ultrasonic waves and vice versa. This paper discusses the mechanical and optical design of the devices at a modest scale (a few μm) and explores the scaling of the transducers toward the sub-micron scale. Results are presented that show how the transducers response changes depending on its local environment and how the resonant frequency shifts when the transducer is loaded by a printed protein sample.
Collapse
Affiliation(s)
- Richard J Smith
- Electrical Systems and Optics Research Division, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| | - Fernando Perez Cota
- Electrical Systems and Optics Research Division, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| | - Leonel Marques
- Electrical Systems and Optics Research Division, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| | - Xuesheng Chen
- Electrical Systems and Optics Research Division, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| | - Ahmet Arca
- Department of Electric and Electronic Engineering, Faculty of Architecture and Engineering, European University of Lefke, Gemikonagi, Mersin 10, Turkey
| | - Kevin Webb
- Electrical Systems and Optics Research Division, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| | - Jonathon Aylott
- School of Pharmacy, University of Nottingham, United Kingdom
| | - Micheal G Somekh
- Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong
| | - Matt Clark
- Electrical Systems and Optics Research Division, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom
| |
Collapse
|
18
|
Zhang L, Roy S, Chen Y, Chua EK, See KY, Hu X, Liu M. Mussel-inspired polydopamine coated hollow carbon microspheres, a novel versatile filler for fabrication of high performance syntactic foams. ACS APPLIED MATERIALS & INTERFACES 2014; 6:18644-18652. [PMID: 25286083 DOI: 10.1021/am503774a] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Syntactic foams, which can be synthesized by mechanical mixing of hollow microspheres with a matrix material, are a special class of lightweight composite materials. Developing of high-performance syntactic foams remains challenges. In this work, a facile and environmentally friendly surface modification method employing polydopamine (PDA) as a surface treatment agent for hollow carbon microspheres (HCMs) was used, aiming to extend the application of syntactic foams to seldom touched areas. The PDA coating was used as a strategy for interfacial interaction enhancement and also as a platform for further metal coating meant for electromagnetic interference (EMI) shielding. The stronger interfacial interaction between microspheres and polymer matrix provided effective interfacial stress transfer, as a result of the syntactic foams with high strength to weight ratio. Furthermore, the PDA coating on HCMs served as a versatile platform for the growth of noble metals on the surface of PDA-HCMs. Silver nanoparticles was grown by PDA medium. The silver coated HCMs (Ag-PDA-HCMs) impacted the complex permittivity of the syntactic foams leading to high EMI shielding effectiveness (SE). The specific EMI SE reached up to 46.3 dB·cm(3)/g, demonstrated the Ag-PDA-HCMs/epoxy syntactic foam as a promising candidate for lightweight high-performance EMI shielding material.
Collapse
Affiliation(s)
- Liying Zhang
- Temasek Laboratories, Nanyang Technological University , 50 Nanyang Drive, Singapore 637553, Singapore
| | | | | | | | | | | | | |
Collapse
|
19
|
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.
Collapse
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
| |
Collapse
|
20
|
Crut A, Maioli P, Del Fatti N, Vallée F. Optical absorption and scattering spectroscopies of single nano-objects. Chem Soc Rev 2014; 43:3921-56. [DOI: 10.1039/c3cs60367a] [Citation(s) in RCA: 147] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
|
21
|
Huang Z, Chi B, Guan J, Liu Y. Facile method to synthesize silver nanoparticles on the surface of hollow glass microspheres and their microwave shielding properties. RSC Adv 2014. [DOI: 10.1039/c4ra01617c] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
In this paper, a facile method for the fabrication of hollow glass microspheres–Ag composite particles with core–shell structures is investigated.
Collapse
Affiliation(s)
- Zheng Huang
- Center for Fuel Cell Innovation
- State Key Laboratory of Material Processing and Die & Mould Technology
- School of Materials Science and Engineering
- Huazhong University of Science & Technology
- Wuhan, China
| | - Bo Chi
- Center for Fuel Cell Innovation
- State Key Laboratory of Material Processing and Die & Mould Technology
- School of Materials Science and Engineering
- Huazhong University of Science & Technology
- Wuhan, China
| | - Jianguo Guan
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing
- Wuhan University of Technology
- Wuhan, China
| | - Yaqing Liu
- Research Center for Engineering Technology of Polymeric Composites of Shanxi Province
- School of Materials Science and Engineering
- North University of China
- TaiYuan, China
| |
Collapse
|
22
|
Cheng P, Bao J, Wu L, Li X, Zhao H, Zhu R, Wang J, Li D. Surface plasmon response of metal spherical nanoshells coated with dielectric overlayer. Chem Phys Lett 2013. [DOI: 10.1016/j.cplett.2013.09.046] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
23
|
Dacosta Fernandes B, Spuch-Calvar M, Baida H, Tréguer-Delapierre M, Oberlé J, Langot P, Burgin J. Acoustic vibrations of Au nano-bipyramids and their modification under Ag deposition: a perspective for the development of nanobalances. ACS NANO 2013; 7:7630-7639. [PMID: 23987911 DOI: 10.1021/nn402076m] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We investigated the acoustic vibrations of gold nanobipyramids and bimetallic gold-silver core-shell bipyramids, synthesized by wet chemistry techniques, using a high-sensitivity pump-probe femtosecond setup. Three modes were observed and characterized in the gold core particles for lengths varying from 49 to 170 nm and diameters varying from 20 to 40 nm. The two strongest modes have been associated with the fundamental extensional and its first harmonic, and a weak mode has been associated with the fundamental radial mode, in very good agreement with numerical simulations. We then derived linear laws linking the periods to the dimensions both experimentally and numerically. To go further, we investigated the evolution of these modes under silver deposition on gold core bipyramids. We studied the evolution of the periods of the extensional modes, which were found to be in good qualitative agreement with numerical simulations. Moreover, we observed a strong enhancement of the radial mode amplitude when silver is deposited: we are typically sensitive to the deposition of 40 attograms of silver per gold core particle. This opens up possible applications in the field of mass sensing, where metallic nanobalances have an important role to play, taking advantage of their robustness and versatility.
Collapse
|
24
|
Kumar VB, Gedanken A, Paik P. Triangular Core–Shell ZnO@SiO
2
Nanoparticles. Chemphyschem 2013; 14:3215-20. [DOI: 10.1002/cphc.201300480] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Indexed: 01/26/2023]
Affiliation(s)
- Vijay Bhooshan Kumar
- Materials Engineering and Nanoscience and Technology, School of Engineering Sciences and Technology, University of Hyderabad, Prof. C. R. Rao Road, Gachibowli, Hyderabad, A.P., 500 046 (India), Fax: (+91) 40‐23011087
| | - Aharon Gedanken
- Institute for Nanotechnology and Advanced Materials, Department of Chemistry, Bar‐Ilan University, Ramat‐Gan, 52900 (Israel)
| | - Pradip Paik
- Materials Engineering and Nanoscience and Technology, School of Engineering Sciences and Technology, University of Hyderabad, Prof. C. R. Rao Road, Gachibowli, Hyderabad, A.P., 500 046 (India), Fax: (+91) 40‐23011087
| |
Collapse
|
25
|
Zhang Q, Ye J, Tian P, Lu X, Lin Y, Zhao Q, Ning G. Ag/TiO2 and Ag/SiO2 composite spheres: synthesis, characterization and antibacterial properties. RSC Adv 2013. [DOI: 10.1039/c3ra40596f] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
|
26
|
Major TA, Crut A, Gao B, Lo SS, Fatti ND, Vallée F, Hartland GV. Damping of the acoustic vibrations of a suspended gold nanowire in air and water environments. Phys Chem Chem Phys 2013. [DOI: 10.1039/c2cp43330c] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
27
|
Kobayashi Y, Nonoguchi Y, Wang L, Kawai T, Tamai N. Dual Transient Bleaching of Au/PbS Hybrid Core/Shell Nanoparticles. J Phys Chem Lett 2012; 3:1111-1116. [PMID: 26288045 DOI: 10.1021/jz300248p] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We examined the optical response of hybrid Au/PbS core/shell nanoparticles (NPs) using transient absorption spectroscopy. Finite-difference time-domain (FDTD) calculations and transient absorption measurements show that Au/PbS NPs have unique two extinction peaks: the peak at the longer wavelength (∼700 nm) is originated from the plasmon, and that at the shorter wavelength (550 nm) is from the local maximum of the refractive index of PbS. The transient absorption dynamics of Au/PbS NPs excited at 400 nm have clear oscillation behavior, which is assigned to the breathing mode of whole particle. We observed a weak excitation-wavelength dependence of the plasmon band. The time constant of electron-phonon coupling of Au/PbS NPs was obtained by changing the excitation intensity. We show that spectral properties of Au/PbS NPs are strongly altered by the hybrid formations, while their dynamics differ only minimally compared with those of Au NPs.
Collapse
Affiliation(s)
- Yoichi Kobayashi
- †Department of Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
| | - Yoshiyuki Nonoguchi
- ‡Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama, Ikoma, Nara, 630-0192, Japan
| | - Li Wang
- †Department of Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
| | - Tsuyoshi Kawai
- ‡Graduate School of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama, Ikoma, Nara, 630-0192, Japan
| | - Naoto Tamai
- †Department of Chemistry, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
| |
Collapse
|
28
|
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%).
Collapse
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
| |
Collapse
|
29
|
Padmanabhan SC, McGrath J, Bardosova M, Pemble ME. A facile method for the synthesis of highly monodisperse silica@gold@silica core–shell–shell particles and their use in the fabrication of three-dimensional metallodielectric photonic crystals. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm31706k] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|