In the Micro-Nano-Magnétisme group – Nano Department, nanoporous alumina membranes with honeycomb pore network are synthesized electrochemically under specific anodizing conditions with acidic electrolytes. The resulting membranes are used as templates for the electrochemical growth of soft magnetic (Ni or Co) and thermoelectric nanowires (BiSbTe and BiTeSe) arrays. Magnetic nanowires are studied for magnetic domain wall motion upon application of an external magnetic field or a spin-polarized current. The influence of pore diameter reduction on the magnetostatic interactions has been determined. Thermoelectric nanowire arrays are developed for optimizing their properties in view of power generation applications (collab. Schneider Electric).

[bleu marine]Nanoporous alumina templates (honeycomb network) obtained by two-step anodizing in acidic aqueous media[/bleu marine]

[bleu marine] Electrodeposition and characterization of nanowire arrays[/bleu marine]

Oxides for cathodes of lithium secondary batteries are investigated in the SPMCE - MCMF group. Electrochemical intercalation of lithium has been recently studied in nanometric MnOx obtained by low-temperature chimie douce routes, as well as in high-potential spinel-type oxides such as LiNi0.5Mn1.5O4 and its derivatives. The associated redox reactions are followed electrochemically, and by various techniques such as XRD, EXAFS-XANES and Raman Spectroscopy. The electrochemical intercalation system is also used for studies of the effect on superconductivity of incorporation/extraction of alkali elements in iron pnictides and chalcogenides.

[bleu marine] Nanostructure of Co-doped MnO2 obtained by chimie douce.[/bleu marine]

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