Two-step synthesis of Te-based single crystalline 1D nanostructures by template-free electrodeposition in ionic liquids, K. Al Hokayem, L. Thiebaud, J. Ghanbaja, N. Stein, S. Legeai - Université de Lorraine Accéder directement au contenu
Communication Dans Un Congrès Année : 2023

Two-step synthesis of Te-based single crystalline 1D nanostructures by template-free electrodeposition in ionic liquids, K. Al Hokayem, L. Thiebaud, J. Ghanbaja, N. Stein, S. Legeai

Karen Al Hokayem
Jaâfar Ghanbaja
Nicolas Stein
Sophie Legeai

Résumé

Electrochemical synthesis of 1D-nanostructures is usually performed in a porous template, thus involving several fabrication steps, from the preparation of the template to its removal. Template-free synthesis is then more convenient, especially for further treatment or transformation of synthesized nanostructures. It has been shown in literature that ionic liquids can act as capping agents allowing the formation of nanostructures without using a template. Taking advantage of these templating properties, we studied electrochemical synthesis of tellurium (Te) nanostructures in a piperidinium ionic liquid. It appeared that that nanostructures morphology mainly depends on mass transport conditions and Te(IV) speciation. Under diffusional control, nanowires can be deposited, whereas applying high overpotential values leads to hollow nanostructures formation due to a limitation by species supply. The electrolyte composition determines the Te(IV) speciation that also strongly influences the morphology of the nanostructures. Specifically, the addition of a small amount of bromide ions in the electrolyte allows to obtain 70 µm long hair-like nanowires with a mean diameter of 50 nm. The size of the nanowires can also be easily controlled by varying the applied coulometric charge. High Resolution Transmission Electron Microscopy analyses show that all the synthesized nanostructures are single crystalline and grow along the c-axis, with a smooth interface and no external surface layer. Tellurium nanostructures can then be used as precursors for the synthesis of single crystalline binary alloys (Ag2Te, Cu2Te) by a soft chemical route, or core@shell nanostructures (Te@Bi, Te@polypyrrole) by electrochemical deposition in the same piperidinium ionic liquid. These Te-based nanostructures could present interesting properties for thermoelectric applications.
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Dates et versions

hal-04161386 , version 1 (13-07-2023)

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  • HAL Id : hal-04161386 , version 1

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Karen Al Hokayem, Laura Thiebaud, Jaâfar Ghanbaja, Nicolas Stein, Sophie Legeai. Two-step synthesis of Te-based single crystalline 1D nanostructures by template-free electrodeposition in ionic liquids, K. Al Hokayem, L. Thiebaud, J. Ghanbaja, N. Stein, S. Legeai. COIL 9, Apr 2023, Lyon, France. ⟨hal-04161386⟩
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