Structural deformation, melting point and lattice parameter studies of size selected silver clusters

Ibrahimkutty, Shyjumon; Gopinadhan, Manesh; Ivanova, Oxana; Quaas, M.; Wulff, H.; Helm, Christiane A.; Hippler, R.

doi:10.1140/epjd/e2005-00319-x

Cited by 121 publications

(90 citation statements)

References 27 publications

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“…For both the thinner and thicker layers the lattice parameter declines significantly. The same trend in the lattice parameter vs. sputtering time dependence was reported also for silver structures, for which the lattice parameter increases slightly up to the structures size of 12 nm and then decreases [55]. In contrast to the as-sputtered gold structures at the annealed ones the lattice parameter is nearly independent on the sputtering time and the size of the structures.…”

Section: ~5 Nmsupporting

confidence: 78%

Gold Nanostructures Prepared on Solid Surface

Siegel¹,

Kvítek²,

Kolská³

et al. 2012

Metallurgy - Advances in Materials and Processes

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Section: ~5 Nmsupporting

confidence: 78%

Gold Nanostructures Prepared on Solid Surface

Siegel¹,

Kvítek²,

Kolská³

et al. 2012

Metallurgy - Advances in Materials and Processes

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“…Aggregation of the NPs was also observed with scanning TEM-high angle annular dark field (STEM-HAADF) ( Figure 2a) and TEM (see also Supporting Information File 1). Areas with different crystal domains were observed and are evidently caused by crystal twinning, which occurs during the NP growth process [28] or by formation of NP agglomerates with different crystal orientations after deposition and diffusion on the substrate [29][30][31]. Figure 2b shows an atomic resolution TEM image of a single NP.…”

Section: Resultsmentioning

confidence: 99%

Influence of size, shape and core–shell interface on surface plasmon resonance in Ag and Ag@MgO nanoparticle films deposited on Si/SiOx

D’Addato¹,

Pinotti²,

Spadaro³

et al. 2016

Nano Online

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Ag and Ag@MgO core-shell nanoparticles (NPs) with a diameter of d = 3-10 nm were obtained by physical synthesis methods and deposited on Si with its native ultrathin oxide layer SiO x (Si/SiO x ). Scanning electron microscopy and transmission electron microscopy (TEM) images of bare Ag NPs revealed the presence of small NP aggregates caused by diffusion on the surface and agglomeration. Atomic resolution TEM gave evidence of the presence of crystalline multidomains in the NPs, which were due to aggregation and multitwinning occurring during NP growth in the nanocluster source. Co-deposition of Ag NPs and Mg atoms in an oxygen atmosphere gave rise to formation of a MgO shell matrix surrounding the Ag NPs. The behaviour of the surface plasmon resonance (SPR) excitation in surface differential reflectivity (SDR) spectra with p-polarised light was investigated for bare Ag and Ag@MgO NPs. It was shown that the presence of MgO around the Ag NPs caused a red shift of the plasmon excitation, and served Beilstein J. Nanotechnol. 2015, 6, 404-413. 405 to preserve its existence after prolonged (five months) exposure to air, realizing the possibility of technological applications in plasmonic devices. The Ag NP and Ag@MgO NP film features in the SDR spectra could be reproduced by classical electrodynamics simulations by treating the NP-containing layer as an effective Maxwell Garnett medium. The simulations gave results in agreement with the experiments when accounting for the experimentally observed aggregation.

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“…Copper icosahedral and decahedral clusters have also been fabricated [19]. Also, of relevance to our analysis, the melting temperatures of gold [14], silver [20,21] and copper [22,23] Metal clusters containing small numbers of atoms N also show catalytic performances of applicative interest. Stable metal particles with enhanced catalytic activity strongly depend on the presence of single atoms or, vice-versa, of single vacancies.…”

Section: Introductionmentioning

confidence: 95%

Kinetic Monte Carlo approach to Schottky defects in noble metal nanoclusters

2016

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The vacancy concentration dependence on temperature and diameter of noble metal (gold, silver, and copper) nanoclusters is investigated using a kinetic Monte Carlo method. Icosahedral and decahedral nanoclusters are studied, with diameters up to 3.73 nm for icosahedral clusters and up to 6.65 nm for decahedral clusters. The cohesive energy is calculated using a coordination number approach, resulting in a linear relation with cluster size. Random Schottky defects are frozen into the clusters at low temperatures (100K-600K) and we find that the vacancy concentration increases with smaller diameters and higher temperatures. We develop a model for this behavior, which explains the temperature and size dependence. Vacancy concentrations are related to the ratio of surface/interior sites based on nearest neighbor calculations. The modified enthalpy and entropy of constant diameter clusters are derived from a logarithmic model for the Gibbs energy. Melting entropy and enthalpy are calculated in this coordination type model and compared with previously published molecular dynamics results.

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Structural deformation, melting point and lattice parameter studies of size selected silver clusters

Cited by 121 publications

References 27 publications

Gold Nanostructures Prepared on Solid Surface

Gold Nanostructures Prepared on Solid Surface

Influence of size, shape and core–shell interface on surface plasmon resonance in Ag and Ag@MgO nanoparticle films deposited on Si/SiOx

Kinetic Monte Carlo approach to Schottky defects in noble metal nanoclusters

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