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Nanomaterials 2018, 8(5), 345; https://doi.org/10.3390/nano8050345

Three-Dimensional Bi2Te3 Networks of Interconnected Nanowires: Synthesis and Optimization

Instituto de Micro y Nanotecnología, IMN-CNM, CSIC (CEI UAM+CSIC) Isaac Newton, 8, E-28760 Madrid, Spain
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Received: 3 May 2018 / Revised: 8 May 2018 / Accepted: 10 May 2018 / Published: 18 May 2018
(This article belongs to the Special Issue Synthesis and Characterization of Nanowires)
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Abstract

Self-standing Bi2Te3 networks of interconnected nanowires were fabricated in three-dimensional porous anodic alumina templates (3D–AAO) with a porous structure spreading in all three spatial dimensions. Pulsed electrodeposition parameters were optimized to grow highly oriented Bi2Te3 interconnected nanowires with stoichiometric composition inside those 3D–AAO templates. The nanowire networks were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), and Raman spectroscopy. The results are compared to those obtained in films and 1D nanowires grown under similar conditions. The crystalline structure and composition of the 3D Bi–Te nanowire network are finely tuned by controlling the applied voltage and the relaxation time off at zero current density during the deposition. With this fabrication method, and controlling the electrodeposition parameters, stoichiometric Bi2Te3 networks of interconnected nanowires have been obtained, with a preferential orientation along [1 1 0], which makes them optimal candidates for out-of-plane thermoelectric applications. Moreover, the templates in which they are grown can be dissolved and the network of interconnected nanowires is self-standing without affecting its composition and orientation properties. View Full-Text
Keywords: electrochemistry; bismuth telluride; nanowires; 3D–AAO; nanonetwork; metamaterial electrochemistry; bismuth telluride; nanowires; 3D–AAO; nanonetwork; metamaterial
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Ruiz-Clavijo, A.; Caballero-Calero, O.; Martín-González, M. Three-Dimensional Bi2Te3 Networks of Interconnected Nanowires: Synthesis and Optimization. Nanomaterials 2018, 8, 345.

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