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Dimensional effects on the tunneling conductivity of gold-implanted nanocomposite films

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Nanoparticles (NPs) are gaining increasing attention for potential application in medicine; consequently, studying their interaction with cells is of central importance. We found that both ligand arrangement and composition on gold nanoparticles play a cru ...

American Vacuum Society2012

Nucleation and Island Growth of Alkanethiolate Ligand Domains on Gold Nanoparticles

Francesco Stellacci, Yue Wang

The metal oxide cluster alpha-AIW(11)O(39)(9-) (1), readily imaged by cryogenic transmission electron microscopy (cryo-TEM), is used as a diagnostic protecting anion to investigate the self-assembly of alkanethiolate monolayers on electrostatically stabili ...

American Chemical Society2012

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In conductor-insulator nanocomposites in which conducting fillers are dispersed in an insulating matrix, the electrical connectedness is established by inter-particle tunneling or hopping processes. These systems are intrinsically non-percolative and a coh ...

American Institute of Physics2012

Size control of gold nanoparticles by intense X-ray irradiation: the relevant parameters and imaging applications

Giorgio Margaritondo

We report the analysis of a reducing-agent-free synthetic method based on intense X-ray irradiation in the presence of 11-mercaptoundecanoic acid (MUA) and their application in biomedical imaging. The method is very effective in controlling the size and si ...

2012

Two series of Au/TiO2 materials with different gold content have been prepared by dc-magnetron sputtering on ceramic shaped pure anatase or Degussa P25 TiO2. The time of deposition was varied between 1 and 20 min in order to obtain different thickness and ...

2011

Electrical conductivity and Young's modulus of flexible nanocomposites made by metal ion implantation of Polydimethylsiloxane: the relationship between nanostructure and macroscopic properties

Herbert Shea, Muhamed Niklaus

The mechanical and electrical properties of nanocomposites created by gold and titanium implantation into Polydimethysiloxane (PDMS) are reported for doses from 1015 at/cm2 to 5x1016 at/cm2, and for ion energies of 2.5 keV, 5 keV and 10 keV. TEM cross-sect ...

Elsevier2011

Immobilized noble metal nanoparticles are being explored for a variety of applications where control over the particle size and separation distance on the substrate is important for performance. A proof of concept is presented that Au nanoparticles can be ...

American Chemical Society2011

Experimental observation of thermal fluctuations in single superconducting Pb nanoparticles through tunneling measurements

Klaus Kern

An important question in the physics of superconducting nanostructures is the role of thermal fluctuations (TFs) on superconductivity in the zero-dimensional limit. Here, we probe the evolution of superconductivity as a function of temperature and particle ...

2011

Metal Clusters on Surfaces

Michael Hugentobler

The morphology, stability and reactivity of nanometre-sized particles (Au, Pt) is investigated on three different supports. Gold nanoparticles with a diameter comprised between 4 and 6nm are stabilized in nanosized pits of well defined depth in highly orie ...

EPFL2010

In this thesis we address the description of electrical transport properties of disordered conductor-insulator composites, mostly by numerical Monte Carlo simulations and analytical study of realistic tunnelling-percolation models. Such composites are basi ...

EPFL2009