Extended x-ray-absorption fine-structure study of Ag particles isolated in solid argon

Montano, P. A.; Schulze, W.; Tesche, B.; Shenoy, G. K.; Morrison, T. I.

doi:10.1103/physrevb.30.672

Cited by 145 publications

(76 citation statements)

References 16 publications

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“…This value is contracted by 0.009 A Ê (0.2%) with respect to the bulk value (4.0862 A Ê ); this is a wellknown effect for small clusters due to the surface stress on the particle (Mays et al, 1968). If we consider the bulk compressibility for silver, 9X6 Â 10 À13 cm 2 dyn À1 , and the surface stress value, f 2286 dyn cm À1 , derived in a previous EXAFS investigation on small Ag clusters (Montano et al, 1984), the expected contraction of the lattice parameter is 0.0092 A Ê , which is in good agreement within the quoted error bars of the experimental observation. This also shows the complementarity of the technique with EXAFS, permitting, in the case of nanometre-sized clusters, a better determination of the lattice parameter by roughly a factor of nine.…”

Section: Discussionsupporting

confidence: 71%

Grazing-incidence X-ray diffraction in the study of metallic clusters buried in glass obtained by ion implantation

d’Acapito

Zontone

1999

J Appl Cryst

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A novel X-ray technique is described for carrying out structural investigations of metallic nanoparticles buried in glass obtained by ion implantation. The method consists of maximizing the scattering contribution of the cluster-rich layer by working at the critical angle for total external re¯ection at the implanted-layer± substrate interface. By using the refracted beam as a probe, the diffraction pro®le of the metallic clusters in very dilute samples can be extracted by a simple subtraction procedure. The new procedure is applied to SiO 2 glasses implanted with Ag ions. The study was performed at the European Synchrotron Radiation Facility. The results indicate that a complete structural investigation can be performed by using highly collimated, very intense synchrotron radiation beams, a grazing-incidence geometry and two-dimensional detectors. The procedure is shown to be very useful for complementing the information from electron techniques (transmission electron microscopy, micro-beam electron diffraction) and X-ray spectroscopic (EXAFS) methods. In particular, the accuracy of the latticeparameter determination is shown to be a factor of nine better than the accuracy of EXAFS results.

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Section: Discussionsupporting

confidence: 71%

Grazing-incidence X-ray diffraction in the study of metallic clusters buried in glass obtained by ion implantation

d’Acapito

Zontone

1999

J Appl Cryst

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“…Another group of investigations proposed a contrary opinion about the size effect of nanoparticle surface energy density. With the help of the Young-Laplace equation [18], surface energy densities of Ag and Pd nanoparticles were deduced based on the experimental data of lattice parameters [19][20][21], where the surface energy density of nanoparticles was found much larger than those of the bulk materials. Nanda et al [22,23] studied further the surface energy density of Ag nanoparticles using experimental data related to the evaporation temperature, in which a surface energy density 7.2J/m 2 was reported, close to 6.4J/m 2 deduced from lattice contraction experiments [19], but much larger than the bulk one 1.2-1.4J/m 2 [24].…”

Section: Introductionmentioning

confidence: 99%

Size effect of the surface energy density of nanoparticles

2015

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The surface energy density of nanoparticles exhibits an obviously size-dependent behavior. However, how the surface energy density changes with the diameter of nanoparticles is still ambiguous. Based on a recently developed continuum theory considering the size effect in nanomaterials, theoretical analysis is carried out for various fcc metallic nanoparticles. Surface lattice contractions of nanoparticles are predicted and compared with the existing experimental data. As a result, the surface energy density decreases with the increase of nanoparticle diameter. Such a variation trend of surface energy density is contrary to the prediction of existing theoretical models but well consistent with the previously atomistic simulations and density functional calculations. The results in this paper provide a further understanding of the surface effect of nanoparticles, which should be helpful for the design of nanoscale devices or nanomaterials related to nanoparticles, such as NEMs and nanoparticlereinforced composites.

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“…The magnetization of 16-nm La 0.7 Sr 0.3 MnO 3 nanoparticles is significantly lower than that of a bulk sample [153]. Using extended XAFS, Montano et al [154] measured the nearest-neighbor distance for silver particles of 2.5e13 nm sizes isolated in solid argon and found a noticeable contraction of the nearest-neighbor atomic distance. Lamber et al [155] have measured the lattice contraction of Pd particles of 1.4e5.0 nm sizes using LEED.…”

Section: Observations and Interpretationsmentioning

confidence: 99%