Showing papers by "Jean-Francois Dayen published in 2011"
TL;DR: Sub-micron-sized [Fe(Htrz)(2)(trz)](BF(4))·H(2)O nanoparticles that exhibit a spin crossover transition are positioned between Au electrodes with sub-100 nm separation and exhibit unexpected large conductivity, with photoconductance and photovoltaic behavior.
62 citations
TL;DR: In this paper, the magnetoresistance properties of ballistic-type Ni nano-junctions obtained at low temperatures were investigated and feedback-controlled electromigration was used to reveal the ballistic nature of the transport and stabilize samples of conductance values in the range of G0 (G0=2e2/h).
Abstract: Fundamental insight is reported into magnetoresistance properties of ballistic-type atomic size Ni nanojunctions obtained at low temperatures. Feedback-controlled electromigration was used to reveal the ballistic nature of the transport and stabilize samples of conductance values in the range of G0 (G0=2e2/h). Bias voltage dependent measurements identify a clear magnetoresistance fingerprint of resonant tunneling, revealing that localized states in the nanojunctions can be responsible for nonlinear behavior in the IV curves and the related magnetoresistance properties.
10 citations
TL;DR: Exposure of a fabricated molecular junction to controlled high solvent flows can be used as a reliability criterion for the presence of molecular entities in a gap by integrating microfluidic circuitry in a lab-on-chip approach.
Abstract: A versatile tool for electrochemical fabrication of heteronanojunctions with nanocontacts made of a few atoms and nanogaps of molecular spacing is presented. By integrating microfluidic circuitry in a lab-on-chip approach, we keep control of the electrochemical environment in the vicinity of the nanojunction and add new versatility for exchanging and controlling the junction's medium. Nanocontacts made of various materials by successive local controlled depositions are demonstrated, with electrical properties revealing sizes reaching a few atoms only. Investigations on benchmark molecular electronics material, trapped between electrodes, reveal the possibility to create nanogaps of size matching those of molecules. We illustrate the interest of a microfluidic approach by showing that exposure of a fabricated molecular junction to controlled high solvent flows can be used as a reliability criterion for the presence of molecular entities in a gap.
8 citations
Patent•
07 Feb 2011
TL;DR: In this article, a transition d'etat de spin electronique commande en temperature is en contact direct avec chacune des deux electrodes, the particule etant de type ionique and comportant un metal de transition qui porte une charge cationique.
Abstract: L'invention concerne un dispositif electrique comportant deux electrodes separees l'une de l'autre dans lequel au moins une particule a transition d'etat de spin electronique commande en temperature est en contact direct avec chacune des deux electrodes, la particule etant de type ionique et comportant un metal de transition qui porte une charge cationique.