Tailoring the Shape of Anisotropic Core–Shell Au–Ag Nanoparticles in Dimethyl Sulfoxide

Haidar, Israa; Day, Axelle; Decorse, Philippe; Lau-Truong, Stéphanie; Chevillot‐Biraud, Alexandre; Aubard, J.; Félidj, Nordin; Boubekeur-Lecaque, Leı̈la

doi:10.1021/acs.chemmater.8b04735

Cited by 23 publications

(27 citation statements)

References 64 publications

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“…35 In another example, coordination of DMSO to the surface of gold nanorods favored the formation of Au@Ag octahedra. 36 In this work, silver nanorods (AgNRs) were prepared by overgrowth of Ag onto gold bipyramids (AuBPs). We show that DMSO can be used to break the symmetry of the AgNRs by restricting Ag growth to one side of the AuBP seed.…”

Section: Introductionmentioning

confidence: 99%

Symmetry Breaking in Seed-Mediated Silver Nanorod Growth Induced by Dimethyl Sulfoxide

et al. 2021

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Engineering symmetry breaking in seed-mediated growth is a fundamental challenge to produce colloidal nanocrystals with controlled morphologies and properties. In this work, we show a simple, aqueous approach to breaking the inversion symmetry of silver nanorods by restricting growth to one end of the pentatwinned gold bipyramid seed. Controlled addition of dimethyl sulfoxide (DMSO) allows us to tune both the symmetry and the length and width of the objects.Simulations and experiments demonstrate the adsorption of DMSO, which displaces interfacial water, reduces binding of surfactant and chloride ions at the gold surface, and slows down the deposition kinetics of silver. Besides showing the potential of DMSO for controlling the synthesis of complex nanostructures, this work opens new perspectives for the study of the physical properties of non-centrosymmetric nanoparticles, e.g. by controlling their plasmon modes and their second-harmonic generation efficiency.

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Section: Introductionmentioning

confidence: 99%

Symmetry Breaking in Seed-Mediated Silver Nanorod Growth Induced by Dimethyl Sulfoxide

et al. 2021

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“…Bimetallic Au@Ag core-shell nanoparticles have received extensive interest for many years due to the possibility of tuning their properties through the size of the core, the thickness of the shell and the structural coupling between the core and the shell. In this way, it becomes possible to modify and control the plasmon resonances for surface-enhanced Raman scattering (SERS) applications, catalysis, and chemical sensing [13,[17][18][19][20][21][22]. The synthesis of alloys or core-shells is facilitated for gold and silver by their similar crystal structure (fcc) and lattice constants (a = 0.408 nm for Au and 0.409 nm for Ag) [19].…”

Section: Introductionmentioning

confidence: 99%

“…A wide variety of synthesis protocols have thus been developed in recent years that play on these multiple parameters. Different morphologies of Au@Ag nanoparticles were obtained, including sphere, cube, nanorod, octahedron or decahedron shapes [18,20,21,23,24,29].…”

Section: Introductionmentioning

confidence: 99%

Versatile and robust synthesis process for the fine control of the chemical composition and core-crystallinity of spherical core–shell Au@Ag nanoparticles

et al. 2020

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Au nanoparticles (NPs) characterized by distinct surface chemistry (including dodecanethiol or oleylamine as capping agent), different sizes (~5 and ~10 nm) and crystallinities (polycrystalline or single crystalline), were chosen as seeds to demonstrate the versatility and robustness of our two-step core-shell Au@Ag NP synthesis process. The central component of this strategy is to solubilize the shell precursor (AgNO 3) in oleylamine and to induce the growth of the shell on selected seeds under heating. The shell thickness is thus controlled by the temperature, the annealing time, the [shell precursor] / [seed] concentration ratio, seed size and crystallinity. The shell thickness is thus shown to increase with the reactant concentration and to grow faster on polycrystalline seeds. The crystalline structure and chemical composition were characterized by HRTEM, STEM-HAADF, EELS and Raman spectroscopy. The plasmonic response of Au@Ag core-shell NPs as a function of core size and shell thickness was assessed by spectrophotometry and simulated by calculations based on the discrete dipole approximation (DDA) method. Finally, the nearly monodisperse coreshell Au@Ag NPs were shown to form micrometer-scale facetted 3D fcc-ordered superlattices (SLs) after solvent evaporation and deposition on a solid substrate. These SLs are promising candidates for applications as a tunable surface-enhanced Raman scattering (SERS) platform.

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“…The localized surface plasmon resonance (LSPR) of metal nanoparticles (NPs) can be tailored by controlling their morphology and composition [1][2][3][4][5] so that multiple modes may appear. Rod-like metal nanostructures that possess two LSPRs corresponding to field polarization along their longitudinal axis (LgSPR) and transverse axis (TrSPR) are an iconic example.…”

Section: Introductionmentioning

confidence: 99%

Sharp Spectral Variations of the Ultrafast Transient Light Extinction by Bimetallic Nanoparticles in the Near‐UV

Otomalo

Mario

Hamon

et al. 2021

Advanced Optical Materials

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Noble metal nanoparticles exhibit localized plasmon resonance modes that span the visible and near‐infrared spectral ranges and have many applications. Modifying the size, shape, and composition of the nanoparticles changes the number of modes and their properties. The characteristics of these modes are transiently affected when illuminating the nano‐objects with ultrashort laser pulses. Here, core–shell gold–silver nanocuboids are synthesized and their spectral signature in the stationary and ultrafast transient regimes are measured. Their dipolar transverse mode vanishes with increasing Ag‐shell thickness, while higher‐order modes grow in the near‐ultraviolet range where no plasmon resonance can be generated with single noble metal nanoparticles. These higher‐energy modes are associated with sharp spectral variations of the ultrafast transient light extinction by the bimetallic nanocuboids. By carrying out a theoretical investigation, the different contributions to this response are broken down and a physical interpretation of its spectral profile is provided. The transient optical signal is then shown to reveal resonance modes hidden in the stationary regime spectra.

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Tailoring the Shape of Anisotropic Core–Shell Au–Ag Nanoparticles in Dimethyl Sulfoxide

Cited by 23 publications

References 64 publications

Symmetry Breaking in Seed-Mediated Silver Nanorod Growth Induced by Dimethyl Sulfoxide

Symmetry Breaking in Seed-Mediated Silver Nanorod Growth Induced by Dimethyl Sulfoxide

Versatile and robust synthesis process for the fine control of the chemical composition and core-crystallinity of spherical core–shell Au@Ag nanoparticles

Sharp Spectral Variations of the Ultrafast Transient Light Extinction by Bimetallic Nanoparticles in the Near‐UV

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