Elasticity of an Assembly of Disordered Nanoparticles Interacting<i>via</i>Either van der Waals-Bonded or Covalent-Bonded Coating Layers

Ayouch, Adil; Dieudonné, Xavier; Vaudel, G.; Piombini, Hervé; Vallé, Karine; Gusev, Vitalyi; Belleville, Philippe; Ruello, P.

doi:10.1021/nn303631d

Cited by 58 publications

(70 citation statements)

References 44 publications

(54 reference statements)

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“…2(b)). As already observed in different nanometric thin films [29][30][31], since the NPS is much thinner (52 nm) than the previous one (180 nm), the photoexcitation leads to the mechanical resonance of the entire superlattice layer at the first predominant harmonic frequency f 1 which leads to the estimate of V LA ≈ 1870-1970 m.s −1 , in close agreement with the previous estimate obtained for the thicker superlattice. The estimate of the sound velocity provides a direct evaluation of the molecular contact elastic stiffness.…”

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confidence: 89%

Ultrafast acousto-plasmonics in gold nanoparticle superlattices

et al. 2015

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We report the investigation of the generation and detection of GHz coherent acoustic phonons in plasmonic gold nanoparticles superlattices (NPS). The experiments have been performed from an optical femtosecond pump-probe scheme across the optical plasmon resonance of the superlattice. Our experiments allow to estimate the collective elastic response (sound velocity) of the NPS as well as an estimate of the nano-contact elastic stiffness. It appears that the light-induced coherent acoustic phonon pulse has a typical in-depth spatial extension of about 45 nm which is roughly 4 times the optical skin depth in gold. The modeling of the transient optical reflectivity indicates that the mechanism of phonon generation is achieved through ultrafast heating of the NPS assisted by light excitation of the volume plasmon. These results demonstrate how it is possible to map the photon-electron-phonon interaction in subwavelength nanostructures.PACS numbers: 78.67. Pt, 73.20.Mf, Plasmon assisted subwavelength light transmission is a key physical mechanism for modern nano-optics and nano-plasmonics [1]. The propagation of plasmonpolariton waves in nano particles nanostructures (chains, arrays) is at the core of intense fundamental investigations and has led to numerous reports [2-6]. For plasmonic applications, it is obviously crucial to understand and control the damping of these plasmonpolariton waves, i.e. the collective propagation distance. This propagation distance as well as a more general description of the dispersion curves for both longitudinal and transverse light electric field have already been obtained for supported 1D chains [2][3][4][5]. The propagation distance is currently limited by the intrinsic electronphonon, electron-defect interaction within each particle as well as radiation loss. In some particular 2D optical spectroscopy imaging, it has been shown recently that the propagation/distribution of the plasmon-polariton could even be mapped for 1D nanoparticles chains [2,6]. The visualization of these plasmons at the interface air/nanostructure with near-field imaging [5] or with an electron beam imaging [7] were also reported. This stateof-art 2D imaging is however limited to 1D or 2D systems, i.e. to surface plasmonics and no local measurement of volume plasmon-polariton propagation has been reported for 3D nanoparticles arrays so far. Most of the plasmonic responses in nanoparticles superlattices are obtained indeed from far field optical absorbance measurements [8,9]. Because of the difficulty to probe the innner part of a plasmonic superlattices, no quantitative depth profiling description of the plasmon-polariton propagation have been reported to date. However, it is known that ultrafast optical techniques can provide a picture in time and space of the light-matter interaction [10][11][12]. In particular, in case of femtosecond light pulses, the light-matter coupling can lead to the emission of coherent acoustic phonons that occurs all over the spatial extension where the light energy is converted in...

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confidence: 89%

Ultrafast acousto-plasmonics in gold nanoparticle superlattices

et al. 2015

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“…Probing the interfaces and the nano-contact (adhesion) has also become a challenge in nanometrology due to the fact that new functional materials are artificial materials assembled of different layers. It has been possible to evaluate the role of contacts between two solids (van der Waals, covalent bonds) on the transmission of coherent acoustic phonons at interfaces [166,[172][173][174] and on the sound velocity in arrays of nanoparticles [175,176] (see Fig. 7) by measuring the time of flight of coherent acoustic phonons in various nanostructures.…”

Section: Probing Nanostructures and Phonon Dynamicsmentioning

confidence: 99%

“…(c) Light-induced mechanical resonance of colloidal films, the cohesion of which is determined by either van der Waals, hydrogen or covalent bonds. The analysis of the resonance frequency allows to evaluate the speed of sound along their chains in colloidal films and hence the nanocontact stiffness between nanoparticles [175]. [60].…”

Section: Probing Nanostructures and Phonon Dynamicsmentioning

confidence: 99%

Nanophononics: state of the art and perspectives

et al. 2016

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Abstract. Understanding and controlling vibrations in condensed matter is emerging as an essential necessity both at fundamental level and for the development of a broad variety of technological applications. Intelligent design of the band structure and transport properties of phonons at the nanoscale and of their interactions with electrons and photons impact the efficiency of nanoelectronic systems and thermoelectric materials, permit the exploration of quantum phenomena with micro-and nanoscale resonators, and provide new tools for spectroscopy and imaging. In this colloquium we assess the state of the art of nanophononics, describing the recent achievements and the open challenges in nanoscale heat transport, coherent phonon generation and exploitation, and in nano-and optomechanics. We also underline the links among the diverse communities involved in the study of nanoscale phonons, pointing out the common goals and opportunities.

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“…Nanoindentation studies on bonded colloidal crystals [162,163] and assemblies [ 164 ] or nanoparticles agglomerates [ 165 ] missed most of the particulate features. A few other works have investigated colloidal ensembles by ultrafast optoacoustic [ 166 ] or microcompression techniques [167,168]. Nanoindentation procedure [161] consisted in indenting the opal by application of an increasing, at a fixed rate, loading force (P) while monitoring the penetration depth (h).…”

Section: Collective Behavior: Mechanical Propertiesmentioning

confidence: 99%

Colloidal crystals and water: Perspectives on liquid–solid nanoscale phenomena in wet particulate media

Gallego-Gómez

Morales‐Flórez

Morales

et al. 2016

Advances in Colloid and Interface Science

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Solid colloidal ensembles inherently contain water adsorbed from the ambient moisture. This water, confined in the porous network formed by the building submicron spheres, greatly affects the ensemble properties. Inversely, one can benefit from such influence on collective features to explore the water behavior in such nanoconfinements. Recently, novel approaches have been developed to investigate in-depth where and how water is placed in the nanometric pores of self-assembled colloidal crystals. Here we summarize these advances, along with new ones, that are linked to general interfacial water phenomena like adsorption, capillary forces and flow. Waterdependent structural properties of the colloidal crystal give clues to the interplay between nanoconfined water and solid fine particles that determines the behavior of ensembles. We elaborate on how the knowledge gained on water in colloidal crystals provides new opportunities for multidisciplinary study of interfacial and nanoconfined liquids and their essential role in the physics of utmost important systems such as particulate media.

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Elasticity of an Assembly of Disordered Nanoparticles InteractingviaEither van der Waals-Bonded or Covalent-Bonded Coating Layers

Cited by 58 publications

References 44 publications

Ultrafast acousto-plasmonics in gold nanoparticle superlattices

Ultrafast acousto-plasmonics in gold nanoparticle superlattices

Nanophononics: state of the art and perspectives

Colloidal crystals and water: Perspectives on liquid–solid nanoscale phenomena in wet particulate media

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