Template-free electrodeposition of 1D Te nanostructures in ionic liquids

Abstract : Electrodeposition of nanowires is usually performed in a porous template and involves multiples fabrication steps, like the preparation of the template and its removal. A single step template-free electrodeposition would in some cases be more convenient, for example to synthesize core@shell structures. It has been shown in literature that ionic liquids, in addition to have high electrochemical and thermal stabilities, can act as capping agents allowing the formation of nanostructures without using a template [1]. We will present here the template-free electrodeposition of Te nanostructures in a piperidinium ionic liquid. A systematic study of the influence of synthesis parameters Te(IV) concentration, applied potential, nature of the cation and of the anion of the ionic liquid and the halide content in the electrolyte) was conducted and revealed that the deposits morphology mainly depends on mass transport conditions and Te(IV) speciation. Under diffusional control, nanowires are deposited (Figure a), whereas by applying high overpotential values and then severe mass transport conditions, hollow nanostructures are formed due to a limitation by species supply (Figure b) [2]. 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 synthesize 70 µm long hair-like nanowires with a mean diameter of 50 nm (Figure c) [3]. High Resolution Transmission Electron Microscopy analyses show that the nanostructures are single crystalline and grow along the c-axis, with a smooth interface and no external surface layer (Figure d).
Type de document :
Poster
Solvay workshop on Ionic liquids: from fundamentals to applications, Feb 2017, Bruxelles, Belgium
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https://hal.univ-lorraine.fr/hal-01494625
Contributeur : Sophie Legeai <>
Soumis le : jeudi 23 mars 2017 - 17:11:19
Dernière modification le : mardi 15 mai 2018 - 11:08:01

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  • HAL Id : hal-01494625, version 1

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Laura Thiebaud, Sophie Legeai, Jaafar Ghanbaja, Nicolas Stein. Template-free electrodeposition of 1D Te nanostructures in ionic liquids. Solvay workshop on Ionic liquids: from fundamentals to applications, Feb 2017, Bruxelles, Belgium. 〈hal-01494625〉

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