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

Zhao, Xin; Nie, Zhaogang; Feng, Yuhua; Zhao, Wenzhu; Zhang, Jiahua; Wen-chun, Zhang; Maioli, Paolo; Loh, Zhi-Heng

doi:10.1039/d0cp03260c

Cited by 3 publications

(3 citation statements)

References 40 publications

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“…An extensive and detailed review of work in this area was given [79], and a more recent one focused on the measurement techniques [80]. Recent works include the analysis of compound nanoparticles [81], analyses concerning the exploitation of nanoplates as antennas in the conversion from the laser pulse to the acoustic pulse [82], and work in the direction of the imaging of acoustic modes [83].…”

Section: Picosecond Ultrasonicsmentioning

confidence: 99%

Ultrasonic and Spectroscopic Techniques for the Measurement of the Elastic Properties of Nanoscale Materials

Beghi¹

2021

Nanomechanics - Theory and Application

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Materials at the nanoscale often have properties which differ from those they have in the bulk form. These properties significantly depend on the production process, and their measurement is not trivial. The elastic properties characterize the ability of materials to deform in a reversible way; they are of interest by themselves, and as indicators of the type of nanostructure. As for larger scale samples, the measurement of the elastic properties is more straightforward, and generally more precise, when it is performed by a deformation process which involves exclusively reversible strains. Vibrational and ultrasonic processes fulfill this requirement. Several measurement techniques have been developed, based on these processes. Some of them are suitable for an extension towards nanometric scales. Until truly supramolecular scales are reached, the elastic continuum paradigm remains appropriate for the description and the analysis of ultrasonic regimes. Some techniques are based on the oscillations of purpose-built testing structures, mechanically actuated. Other techniques are based on optical excitation and/or detection of ultrasonic waves, and operate either in the time domain or in the frequency domain. A comparative overview is given of these various techniques.

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Section: Picosecond Ultrasonicsmentioning

confidence: 99%

Ultrasonic and Spectroscopic Techniques for the Measurement of the Elastic Properties of Nanoscale Materials

Beghi¹

2021

Nanomechanics - Theory and Application

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“…This technique, which allows to measure the vibrations on ensemble [15][16][17] but also on a single nanoparticle [18][19][20] have proven to be a very efficient way [21][22][23][24]. Therefore, it has been employed in order to study the shape-, size-, or material-dependence of the vibrational response for a large variety of mNOs [15,18,19,[25][26][27][28][29][30][31][32][33][34][35]. In particular, it has been shown that the environment greatly affects the vibrations of a mNO, notably the damping rate [34,[36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Substrate influence on the vibrational response of gold nanoresonators: Towards tunable acoustic nanosources

Delalande

Bonhomme²,

Dandeu³

et al. 2022

Phys. Rev. B

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The development of applications based on metallic nano-objects requires an extensive knowledge of their vibrational properties. Its size, shape, materials or even crystallinity have a strong influence on the vibrational frequencies of a nano-object. It is also known that the coupling with environment has a strong effect on the lifetime of its resonating modes. However, the impact of the contact between a nano-object and its substrate still requires further investigation. Here we report on the vibrational response of gold disks for different contact area with a silicon substrate. The investigation of the quality factor of the first thickness mode of the disks highlights an important energy transfer from the disks to the substrate. The impact of the size of the contact area on the frequencies of the radial eigenmodes is also reported both experimentally and numerically.Finally, it is shown that such objects can be excited by acoustic waves propagating from the substrate. These findings display the possibility to use nanodisks to develop acoustic microscopy at the nanoscale.

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“…The breathing frequency decreases with the addition of silver, whereas the extensional mode is almost unchanged. Related systems based on gold bipyramids [27] or nanosphere dimers [28] have also been prepared and studied.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Vibration Modes of Gold–Silver Core–Shell Nanoparticles

et al. 2022

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

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...

Cited by 3 publications

References 40 publications

Ultrasonic and Spectroscopic Techniques for the Measurement of the Elastic Properties of Nanoscale Materials

Ultrasonic and Spectroscopic Techniques for the Measurement of the Elastic Properties of Nanoscale Materials

Substrate influence on the vibrational response of gold nanoresonators: Towards tunable acoustic nanosources

Acoustic Vibration Modes of Gold–Silver Core–Shell Nanoparticles

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