Auto-supported Te nanowires synthesis by template-free electrodeposition from a piperidinium ionic liquid

Abstract : Since several years, the synthesis of materials at the nanoscale finds extensive attention since they show unique physical and chemical properties. Template-assisted electrochemical deposition (ECD) is a low cost technique widely used in literature for the synthesis of 1D nanostructures, using anodic aluminium oxide (AAO) or polycarbonate membranes templates , . However, nanostructures embedded in the nanopores of a template can represent a limitation for further applications and a template-free synthesis route would be more convenient, cheaper and easier to perform. Recently, it has been highlighted that RTILs can act as templating and stabilizing agents for nanoparticles and nanostructured films synthesis , . In this work, we report on the template-free synthesis of Te nanowires from the 1-ethyl-1-octylpiperidinium bis(trifluoromethylsulfonyl)imide ionic liquid (EOPipTFSI).Tellurium (Te) and its alloys present interesting physical properties (electric, thermal, optoelectronic) and are used in many applications such as photoconductors , piezoelectric devices , thermoelectric generators and coolers . Te-alloys nanostructures are obtained, in most cases, from Te nanowires, which synthesis represent then a great interest. In the case of Te deposition, another advantage of using an ionic liquid as electrolyte is the high solubility of Te(IV) precursors in RTILs compared to aqueous media. Very few reports deal with Te electrochemistry in RTILs. Jeng et al studied elemental Te electrodeposition in the basic melt EMIMCl/AlCl3 (1-ethyl-3-methylimidazolium chloride/aluminium chloride), but the bulk deposition lead to poorly adherent Te powder . To our knowledge, no study has been reported on the template-free ECD of 1D nanostructures in RTILs. Our results show that Te nanowires arrays can be electrodeposited by adjusting experimental parameters. The morphology and the structure of the deposits have been investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). Depending on electrolyte temperature and composition, the coatings can be constituted from Te nanowires perpendicular to the substrate. Transmission electronic microscopy (TEM) revealed that the nanowires are single-crystalline and grew along the [001] direction.
Type de document :
Communication dans un congrès
EUCHEM 2012, Aug 2012, Newport, United Kingdom
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https://hal.univ-lorraine.fr/hal-01496335
Contributeur : Sophie Legeai <>
Soumis le : lundi 27 mars 2017 - 14:14:54
Dernière modification le : mardi 21 août 2018 - 09:46:03

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  • HAL Id : hal-01496335, version 1

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Jonathan Szymczak, Sophie Legeai, Sebastien Diliberto, Nicolas Stein, Clotilde Boulanger. Auto-supported Te nanowires synthesis by template-free electrodeposition from a piperidinium ionic liquid. EUCHEM 2012, Aug 2012, Newport, United Kingdom. 〈hal-01496335〉

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