Real-Time Monitoring of Growing Nanoparticles

Renaud, Gilles; Lazzari, Rémi; Revenant, Christine; Barbier, Antoine; Noblet, M.; Ulrich, Olivier; Leroy, F.; Jupille, Jacques; Borensztein, Y.; Henry, Claude R.; Deville, J.P.; Scheurer, F.; Mané-Mané, J.; Fruchart, Olivier

doi:10.1126/science.1082146

Cited by 346 publications

(227 citation statements)

References 22 publications

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“…To date, the most thoroughly studied metal/oxide system in terms of structural elucidation during growth and sintering is Pd on MgO(1 0 0) [3,[23][24][25][26][27][28][29]. We have, therefore, chosen to carry out theoretical calculations on this system, but its properties are qualitatively typical of many other interesting metal/oxide systems [4].…”

Section: Introductionmentioning

confidence: 99%

Pd diffusion on MgO(100): The role of defects and small cluster mobility

Henkelman

Campbell

et al. 2006

Surface Science

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Density functional theory is used to explore the energy landscape of Pd atoms adsorbed on the terrace of MgO(1 0 0) and at oxygen vacancy sites. Saddle point finding methods reveal that small Pd clusters diffuse on the terrace in interesting ways. The monomer and dimer diffuse via single atom hops between oxygen sites with barriers of 0.34 eV and 0.43 eV respectively. The trimer and tetramer, however, form 3D clusters by overcoming a 2D-3D transition barrier of less than 60 meV. The trimer diffuses along the surface either by a walking or flipping motion, with comparable barriers of ca. 0.5 eV. The tetramer rolls along the terrace with a lower barrier of 0.42 eV. Soft rotational modes at the saddle point lead to an anomalously high prefactor of 1.3 · 10 14 s À1 for tetramer diffusion. This prefactor is two order of magnitude higher than for monomer diffusion, making the tetramer the fastest diffusing species on the terrace at all temperatures for which diffusion is active (above 200 K). Neutral oxygen vacancy sites are found to bind Pd monomers with a 2.63 eV stronger binding energy than the terrace. A second Pd atom, however, binds to this trapped monomer with a smaller energy of 0.56 eV, so that dimers at defects dissociate on a time scale of milliseconds at room temperature. Larger clusters bind more strongly at defects. Trimers and tetramers dissociate from monomer-bound-defects at elevated temperatures of ca. 600 K. These species are also mobile on the terrace, suggesting they are important for the ripening observed at P600 K during Pd vapor deposition on MgO(1 0 0) by Haas et al.

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Section: Introductionmentioning

confidence: 99%

Pd diffusion on MgO(100): The role of defects and small cluster mobility

Henkelman

Campbell

et al. 2006

Surface Science

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“…Previously the program IsGISAXS has been used for simulations of inorganic systems, such as nanoparticles on a substrate (Renaud et al, 2003), or for thin polymer films (Mü ller-Buschbaum et al, 2004). However, as demonstrated here, it also provides a useful tool for analysis of two-dimensional protein structures.…”

Section: Figurementioning

confidence: 99%

Self-assembled films of hydrophobin protein HFBIII from Trichoderma reesei

Kisko¹,

Szilvay²,

Vuorimaa³

et al. 2007

J Appl Crystallogr

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Hydrophobins are a group of small amphiphilic proteins which are known to self-assemble on interfaces. They contain eight conserved cysteine residues, which make four disulfide bridges. A new hydrophobin protein, HFBIII, from the fungus Trichoderma reesei contains one extra cysteine residue, giving the protein a naturally reactive site. The self-assembly of hydrophobin protein HFBIII was studied using grazing-incidence X-ray diffraction and reflectivity. HFBIII self-assembles into a hexagonally ordered monolayer at an air/water interface and also forms crystalline coatings on a silicon substrate. The lattice constants for the hexagonal coatings are a = b = 56.5 Å , = 120 . The selfassembled structure in the HFBIII film is very similar to those formed by two other T. reesei hydrophobins, HFBI and HFBII.

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“…(a) The state of the art was demonstrated with in-situ GISAXS characterization during molecular beam epitaxy deposition on monocrystalline substrates (Renaud et al, 2003;Fig. 5).…”

Section: Emittance-dependent Experiments: Grazing-incidence Saxsmentioning

confidence: 99%

Contribution of synchrotron radiation to small-angle X-ray scattering studies in hard condensed matter

Simon

2007

J Appl Cryst

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Synchrotron radiation, by virtue of its special beam characteristics (high flux, high brilliance, tuneable wavelength etc.), has revived interest in small-angle X-ray scattering (SAXS) for hard condensed matter and materials science. New techniques (ultra SAXS, grazing-incidence SAXS, X-ray photon correlation spectroscopy etc.) have been developed and new scientific themes tackled, ranging from metallurgy to nanotechnology.

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Real-Time Monitoring of Growing Nanoparticles

Cited by 346 publications

References 22 publications

Pd diffusion on MgO(100): The role of defects and small cluster mobility

Pd diffusion on MgO(100): The role of defects and small cluster mobility

Self-assembled films of hydrophobin protein HFBIII from Trichoderma reesei

Contribution of synchrotron radiation to small-angle X-ray scattering studies in hard condensed matter

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