Publications de Jean-Pierre Abid

Correspondence "Origin of the magneto–thermogalvanic voltage in cluster-assembled metallic nanostructures"

Jean-Philippe Ansermet, Jean-Pierre Abid, Santiago Serrano Guisan, Giulia Di Domenicantonio

2008

Controlled Reversible Adsorption of Core-Shell Metallic Nanoparticles at the Polarized Water/1,2-Dichloroethane Interface Investigated by Optical Second-Harmonic Generation

Pierre-François Marie Brevet, Hubert Girault, Jean-Pierre Abid, Christophe Bauer

We report the observation of the reversible adsorption of core-shell gold-silver nanoparticles at the polarized water/1,2-dichloroethane interface using the nonlinear optical technique of surface second-harmonic generation. This study unambiguously demonst ...

2007

Adsorption monitoring device

Hubert Girault, Jean-Pierre Abid

A device for monitoring the adsorption of target molecules on a substrate, the device comprising a substrate (1), at least a portion of which is formed as a thin dielectric layer. A first, modified surface (2) of the layer has ionizable groups of the subst ...

2006

Enhanced magnetic field sensitivity of spin-dependent transport in cluster-assembled metallic nanostructures

Jean-Philippe Ansermet, Jean-Pierre Abid, Santiago Serrano Guisan, Giulia Di Domenicantonio

The emerging field of spintronics explores the many possibilities offered by the prospect of using the spin of the electrons for fast, nanosized electronic devices. The effect of magnetization acting on a current is the essence of giant or tunnel magnetore ...

Nature Publishing Group2006

Magnetotransport properties depending on the nanostructure of Fe3O4 nanowires

Jean-Philippe Ansermet, Jean-Pierre Abid, Santiago Serrano Guisan, Sami Jannin

We have studied the magnetic behaviour of Fe3O4 nanowires (NWs) with two different diameter ranges, above 150 nm and below 60 nm, made by electrodeposition techniques into a polymeric template. The nanowires were characterized using various techniques, in ...

2006

Ferromagnetism at Room Temperature on Electrodeposited Co2+-Doped ZnO Thin Film

Jean-Philippe Ansermet, Jean-Pierre Abid

Predicted by the theory, ferromagnetism is expected in Co-doped ZnO. Recently, ferromagnetism above room temperature was reported in thin films as well as in bulk samples made of cobalt-doped zinc oxide. In this study, we report the preparation of ZnO dope ...

2006

Nanowires Networks for Biomolecular Detection using Contactless Impedance Tomoscopy Technique

Jean-Philippe Ansermet, Hubert Girault, Jean-Pierre Abid

Here we present the detection of ultralow concentrations of biomolecules in a device made from a polycarbonate membrane containing a network of gold nanowires and using a “contactless” impedance tomoscopy technique. The sensor comprises a thin dielectric l ...

2006

Role of Adsorbates on Dynamics of Hot-Electron (type I and II) Thermalization within Gold Nanoparticles

Hubert Girault, Jean-Pierre Abid, Christophe Bauer

Early stages of hot-electron thermalization in small gold nanoparticles wrapped in an adsorbates shell have been investigated by femtosecond transient absorption spectroscopy. Type-I hot electrons thermalize in 800 fs (to form type-II hot electron) either ...

Elsevier2006

Hot Adsorbate-Induced Retardation of the Internal Thermalization of Nonequilibrium Electrons in Adsorbate-Covered Metal Nanoparticles

Hubert Girault, Jean-Pierre Abid, Christophe Bauer

Femtosecond transient absorption spectroscopy has been used to investigate the electron-electron scattering dynamics in sulfate-covered gold nanoparticles of 2.5 and 9.2 nm in diameter. We observe an unexpected retardation of the absolute internal thermali ...

2006

Size Dependence of Investigations of Hot Electron Cooling Dynamincs in Metal/Adsorbates Nanoparticles

Hubert Girault, Jean-Pierre Abid, Christophe Bauer

The size dependence of electron-phonon coupling rate has been investigated by femtosecond transient absorption spectroscopy for gold nanoparticles (NPs) wrapped in a shell of sulfate with diameter varying from 1.7 to 9.2 nm. Broad-band spectroscopy gives a ...

Elsevier2005

Supercapacitive Admittance Tomoscopy

Hubert Girault, Jean-Pierre Abid

A sensor for measuring adsorption on a substrate has been designed including a contactless detection scheme, called supercapacitive admittance tomoscopy (SCAT). The sensor comprises a thin dielectric layer with two parallel band electrodes on the one side ...

2005

Adsorption and photoreactivity of CdSe nanoparticles at liquid|liquid interfaces

Hubert Girault, Jean-Pierre Abid, Nicolas Eugster, Bin Su

The voltage induced assembly and photoreactivity of cadmium selenide (CdSe) nanoparticles protected by mercaptosuccinic acid are studied at the polarisable interface between water and 1,2-dichloroethane electrolyte solutions. Cyclic voltammograms and admit ...

2005

Self-assembled organic monolayers on gold nanoparticles: A study by sum-frequency generation combined with UV-vis spectroscopy

Hubert Girault, Jean-Pierre Abid

We use sum-frequency generation spectroscopy (SFG) in the infrared 2800–3000 cm−1 spectral range and UV–vis spectroscopy (transmission) in the 450–650 nm spectral range in order to characterize vibrational and electronic properties of various interfaces co ...

Elsevier2005

Size-Selective Separation of Gold Nanoparticles using Isoelectric Focusing Electrophoresis (IEF)

Hubert Girault, Jean-Pierre Abid, Christophe Roussel

Isoelectric focusing in a polyacrylamide pH gradient gel is used to analyze the size distribution of gold nanoparticles synthesized by a chemical route with mercaptosuccinic acid as a ligand. The isoelectric point of the nanoparticles is shown to be size d ...

Royal Society of Chemistry2005

Pure Surface Plasmon Resonance Enhancement of The First Hyperpolarizability of Gold Core-Silver Shell Nanoparticles

Pierre-François Marie Brevet, Hubert Girault, Jean-Pierre Abid

2004

Ultrafast chemical interface scattering as an additional decay channel for nascent nonthermal electrons in small metal nanoparticles

Hubert Girault, Jean-Pierre Abid, Christophe Bauer

2004

Laser induced synthesis and nonlinear optical properties of metal nanoparticles

Jean-Pierre Abid

EPFL2003

Preparation of silver nanoparticles in solution from a silver salt by laser irradiation

Pierre-François Marie Brevet, Hubert Girault, Jean-Pierre Abid

Royal Society of Chemistry2002

Selective structure changes of core-shell gold-silver nanoparticles by laser irradiation: homogeneisation vs. silver removal

Pierre-François Marie Brevet, Hubert Girault, Jean-Pierre Abid

Royal Society of Chemistry2001