Optical properties of gold clusters in the size range 2–4 nm

Palpant, Bruno; Prével, B.; Lermé, J.; Cottancin, E.; Pellarin, M.; Treilleux, M.; Pérez, A.; Vialle, Jean; Broyer, M.

doi:10.1103/physrevb.57.1963

Cited by 282 publications

(193 citation statements)

References 51 publications

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“…There was also increased damping and broadening of the absorption band, agreeing with Alvarez et al (115). Palpant et al (49) applied theoretical time-dependent localdensity-approximation (TDLDA) calculations to their results, and found good agreement. In this theory, the conduction electrons are treated quantum-mechanically, whereas the optical properties of the matrix and ionic core background are treated classically through bulk-like dielectric functions.…”

Section: Effects Of Nanoparticle Sizesupporting

confidence: 68%

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The third order nonlinear optical properties of gold nanoparticles in glasses, part II

2003

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The optical properties of gold nanoparticles have been known for a number of years and recent advances in laser power have now allowed the non-linear optical properties to be studied. In this short review paper, the various theories that have been used to describe the optical properties of gold nanoparticles are presented. Methods of preparing gold nanoparticles in glasses are explained briefly, as well as characterization techniques. The optical properties of gold nanoparticles are reviewed, as well as the effects of particle size, shape, concentration and c. Effects Of Nanoparticle SizeThe relationship between optical properties and nanoparticle radius has been studied in glasses with dispersed colloid Au nanoparticles (111,112). The peak plasmon wavelength shifts continuously to longer wavelengths with increasing average particle radius. A similar dependence was seen in silica glasses dispersed with Au colloid particles (112,113). Foss et al. (68) found significant transparency in the near-IR region and strong extinction in the visible for particles with nearsphere like shape. The wavelength of maximum extinction increased with increasing particle radius, giving rise to colour variations (red-purple for 30 nm size and blue-green for 60 nm size). This is shown in Figure 1. This was consistent with the findings of Mie (17). Hosoya et al. (73) and Muto et al. (102) found in Au:Al2O3 thin films that the spectra broadened and the peak shifted to longer wavelengths as the particle size decreased. Muto et al. (102) explained it as due to charge transfer from the metal particles to the amorphous oxide by the aluminium-metal bonds used in adhesion. The decreased electron density of the metal particles gives rise to the blue-shift. This behaviour was opposite to that of Au:SiO2, and indicates that the matrix has an effect on the blue-or red-shift of the plasmon peak with size.As the wavelength of the surface plasmon resonance changes with particle size, the χ (3) is also expected to change with size. Fukumi et al. (60), found χ (3) to be approximately proportional to the fourth power of the particle radius. They also found that χm (3) (of the metal particles on their own) had negligible dependence on the particle radius. The value of χm (3) = 2.5 x 10 -8 esu agreed with that of Hache et al. (32) and Bloemer et al. (114). Hornyak et al. (69) prepared Au nanoparticles in nanoporous alumina membranes, and absorption properties for nanoparticles of size 52 nm down to 16 nm, and with various aspect ratios. They used a modified form of MG theory, called the dynamic MG (DMG) theory (68), to model the optical properties. They found that as the nanoparticle size decreased, the wavelength of the maximum absorption intensity max approached the value predicted by DMG theory. For the smallest diameter particles, (16 nm), the values were identical with DMG theory, and they suggested that there was a quasi-static DMG limit ( max does not change from ~5 08 nm) for nanoparticles of diameter 16 nm. Alvarez et al. (115) pr...

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Section: Effects Of Nanoparticle Sizesupporting

confidence: 68%

“…They also suggested that there was a critical size of ~2 nm, below that the electronic structure changes dramatically. Palpant et al (49) reported that the SPR blue-shifts with decreasing cluster size (2.0-3.7 nm). There was also increased damping and broadening of the absorption band, agreeing with Alvarez et al (115).…”

Section: Effects Of Nanoparticle Sizementioning

confidence: 99%

The third order nonlinear optical properties of gold nanoparticles in glasses, part II

2003

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“…Structural characterization using a variety of experimental techniques can be performed on Au clusters [62,63,64,65,66]. Experiments suggest that gold nanoclusters with diameters of 1-2 nm, corresponding to aggregates with N=20-200 atoms, are amorphous [62,63].…”

Section: B Gold Clustersmentioning

confidence: 99%

Global minima of Al_N, Au_Nand Pt_N,N⩽ 80, clusters described by the Voter–Chen version of embedded-atom potentials

Sebetci

Güvenç

2005

Modelling Simul. Mater. Sci. Eng.

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Using the basin-hopping Monte Carlo minimization approach we report the global minima for aluminium, gold and platinum metal clusters modelled by the Voter-Chen version of the embeddedatom model potential containing up to 80 atoms. The virtue of the Voter-Chen potentials is that they are derived by fitting to experimental data of both diatomic molecules and bulk metals simultaneously. Therefore, it may be more appropriate for a wide range of the size of the clusters. This is important since almost all properties of the small clusters are size dependent. The results show that the global minima of the Al, Au and Pt clusters have structures based on either octahedral, decahedral, icosahedral or a mixture of decahedral and icosahedral packing. The 54-atom icosahedron without a central atom is found to be more stable than the 55-atom complete icosahedron for all of the elements considered in this work. The most of the Al global minima are identified as some fcc structures and many of the Au global minima are found to be some low symmetric structures, which are both in agreement with the previous experimental studies.

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“…Let us stress that such a phenomenological way to describe finite size effects in gold nanoparticles would not be sufficient to explain the actual observations for the optical response. Indeed, a realistic interpretation should include the influence of both the free electron spill-out and the skin of reduced polarizability for the core d electrons [35]. The absorption spectrum of our virtual sample, deduced from MGT, is shown on Fig.…”

Section: Influence Of Thermal Exchanges On the Nonlinear Optical Respmentioning

confidence: 99%

Gold nanoparticle assemblies: interplay between thermal effects and optical response

et al. 2008

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The optical response of materials based on gold nanoparticle assemblies depends on many parameters regarding both material morphology and light excitation characteristics. In this paper, the interplay between the optical and thermal responses of such media is particularly investigated under its theoretical aspect. Both conventional and original modeling approaches are presented and applied to concrete cases. We first show how the interaction of light with matrix-embedded gold nanoparticles can result in the generation of thermal excitations through different energy exchange mechanisms. We then describe how thermal processes can affect the optical response of a nanoparticle assembly. Finally, we connect both aspects and point out their involvement in the nonlinear optical response of nanocomposite media. This allows us to tackle two key issues in the field of third-order nonlinear properties of gold nanoparticles: The influence of the generalized thermal lens in the long laser pulse regime and the hot electron contribution to the gold particle intrinsic third-order susceptibility, including its spectral dispersion and intensity-dependence. Additionally, we demonstrate the possible significant influence of the heat carrier ballistic regime and phonon rarefaction in the cooling dynamics of an embedded gold nanoparticle subsequent to ultrafast pulsed laser excitation.

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Optical properties of gold clusters in the size range 2–4 nm

Cited by 282 publications

References 51 publications

The third order nonlinear optical properties of gold nanoparticles in glasses, part II

The third order nonlinear optical properties of gold nanoparticles in glasses, part II

Global minima of Al_N, Au_Nand Pt_N,N⩽ 80, clusters described by the Voter–Chen version of embedded-atom potentials

Gold nanoparticle assemblies: interplay between thermal effects and optical response

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Optical properties of gold clusters in the size range 2–4 nm

Cited by 282 publications

References 51 publications

The third order nonlinear optical properties of gold nanoparticles in glasses, part II

The third order nonlinear optical properties of gold nanoparticles in glasses, part II

Global minima of AlN, AuNand PtN,N⩽ 80, clusters described by the Voter–Chen version of embedded-atom potentials

Gold nanoparticle assemblies: interplay between thermal effects and optical response

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Global minima of Al_N, Au_Nand Pt_N,N⩽ 80, clusters described by the Voter–Chen version of embedded-atom potentials