Laboratoire de Physique et Chimie des Nano-objets

Institut National des Sciences Appliquées
135 avenue de Rangueil, 31077 TOULOUSE CEDEX 4 - FRANCE
Tél : 00 33 05 61 55 96 45 | Fax : (+33) (0)5 61 55 96 97

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Home page > LPCNO > Job opportunities > PhD Thesis

PhD Thesis

phD thesis 2019 – Funded project
Submillimeter magnets for portable magnetic devices

Portable and flexible electronics are spread in countless devices of our daily life thanks to the tremendous efforts of the semiconductor industry to keep on integrating smaller but more efficient transistors.
We have developed at the LPCNO a new magnetophoresis approach for the fabrication of integrated submillimeter magnets. This bottom-up approach is based on a unique know-how on the synthesis of Co nanorods (NRs) with optimized magnetic properties.

The work program focuses on the major challenges presented by this project:
(i) The synthesis and the modification of the surface chemistry of Co NRs.
(ii) The study of the localised assembly of NRs under the combined effect of magnetic and capillary forces to control the final shape of the magnet and further increase its density.
(iii) The characterization of the induced magnetic field created by these nanostractured magnets.
(iv) The fabrication of an array of micro-magnets to be integrated onto an electromagnetc energy harvester developped in close collaboration with Thierry Leïchlé at LAAS.

Contacts: Lise-Marie Lacroix, LPCNO. lmlacroi@insa-toulouse.fr
Thierry Ondarçuhu, IMFT. thierry.ondarcuhu@imft.fr

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PhD position 2019.
Sub-nanometric metal wires: at the frontier between metallic nanostructures and supramolecular self-assemblies

The recent efforts on size reduction of metallic nanoparticles leads to a wide variety of objects with tunable morphology and properties. From now on, the new frontiers to be explored, to obtain unprecedented properties, lie between supramolecular organizations and solid nano-objects.

The objectives of the PhD are :
- The synthesis of bimetallic (Au-Pd, Au-Pt, Au-Ag) ultrathin nanowires [1] ;
- The structural characterization of ulltrathin nanowires by high energy X-ray diffraction on synchrotron and atomic resolution electron microscopy ; the study of the effect of alloying on the growth of quasiperiodic 1D metal nanoparticles;
- The study of the growth mechanism by small angle X-ray scattering (SAXS) and X-ray absorption spectroscopy (XANES, EXAFS) using microfluidic techniques;
- The development of a dielectrophoresis cell for nanowires alignment in solution and in situ characterization of parallel assemblies of nanowires; it will allow to complete the structural characterization and to study the effect of high frequency electric fields on the anisotropic growth.

Contacts: Guillaume Viau gviau@insa-toulouse.fr Lise-Marie lmlacroi@insa-toulouse.fr Tel. 05 67 04 88 33

Location: LPCNO UMR INSA-CNRS-UPS 135 av. de Rangueil 31077 Toulouse Cedex 4 http://lpcno.insa-toulouse.fr/ Equipe Nanostructures et Chimie Organométallique (NCO)

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Electronic transport properties in individual metallic nano-objects synthesized by chemical routes

PhD thesis proposition at the LPCNO in the Nanomagnetism group

For several decades already, the study of the electronic transport properties of nano-objects (NO) connected to metallic macro-electrodes allowed to measure a diversity of electronic conduction regimes very fascinating. For instance, the study of the transport properties of individual semi-conducing quantum dots or metallic nano-islands allowed to highlight Coulomb blockade regimes which are a signature of the electron corpuscular nature. In this kind of regime, the current flow is blocked over a large range of polarisation voltages because of the Coulomb electron repulsion. Beyond a threshold voltage, electron injection is possible and electrons flow one by one through the dot. The technological potential of such a device to build very fast single electron transistors is huge (...)

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OFFRE THESE 2019 : Assemblages colloïdaux dirigés originaux assistés par microfluidique

Laboratoire de Physique et Chimie des Nano-Objets (LPCNO-UMR 5215 INSA-CNRS-UPS) @ Toulouse

Mots clés - Assemblage dirigé, Nanoxérographie, Nano-objets colloïdaux, Microfluidique.

Introduction et contexte - L’étude des propriétés originales de nanoparticules colloïdales synthétisées par voie chimique ainsi que leur intégration pour réaliser la zone active de dispositifs fonctionnels innovants requiert leur assemblage dirigé sur des zones. parfaitement définies de surfaces solides ou flexibles. Depuis plusieurs années, l’équipe Nanotech du Laboratoire de Physique et Chimie des Nano-Objets (LPCNO- UMR 5215 INSA-CNRS-UPS) à Toulouse a développé une technique innovante, la nanoxérographie, répondant à ce défi 1–5. Ce procédé consiste à induire, dans un matériau électret, des charges électrostatiques selon des motifs de géométrie désirée. Les motifs chargés obtenus servent ensuite de pièges pour assembler électrostatiquement sur la surface, des nano-objets chargés ou polarisables initialement dispersés en phase liquide. Afin d’adresser des surfaces de plusieurs dizaines de centimètres carrés, l’étape d’injection est réalisée en employant des méthodes dérivées de la lithographie douce et maîtrisées dans l’équipe (techniques dite de microcontact printing électrique, e-μCP)6.

Contact - Intéressé(e) ? N’hésitez pas à contacter Laurence Ressier et Etienne Palleau laurence.ressier@insa-toulouse.fr / epalleau@insa-toulouse.fr - tél : 05.61.55.96.72

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