Improved electrical and thermoelectric properties of electrodeposited Bi 1- x Sb x nanowire networks by thermal annealing.

Autor: Piraux L; Institute of Condensed Matter and Nanosciences (ICMN), Université catholique de Louvain (UCLouvain) Louvain-la-Neuve B-1348 Belgium luc.piraux@uclouvain.be., Marchal N; Institute of Condensed Matter and Nanosciences (ICMN), Université catholique de Louvain (UCLouvain) Louvain-la-Neuve B-1348 Belgium luc.piraux@uclouvain.be., Van Velthem P; Institute of Condensed Matter and Nanosciences (ICMN), Université catholique de Louvain (UCLouvain) Louvain-la-Neuve B-1348 Belgium luc.piraux@uclouvain.be., da Câmara Santa Clara Gomes T; Institute of Condensed Matter and Nanosciences (ICMN), Université catholique de Louvain (UCLouvain) Louvain-la-Neuve B-1348 Belgium luc.piraux@uclouvain.be., Araujo FA; Institute of Condensed Matter and Nanosciences (ICMN), Université catholique de Louvain (UCLouvain) Louvain-la-Neuve B-1348 Belgium luc.piraux@uclouvain.be., Ferain E; Institute of Condensed Matter and Nanosciences (ICMN), Université catholique de Louvain (UCLouvain) Louvain-la-Neuve B-1348 Belgium luc.piraux@uclouvain.be.; it4ip s.a. Avenue Jean-Etienne Lenoir 1 Louvain-la-Neuve B-1348 Belgium., Issi JP; Institute of Condensed Matter and Nanosciences (ICMN), Université catholique de Louvain (UCLouvain) Louvain-la-Neuve B-1348 Belgium luc.piraux@uclouvain.be., Antohe VA; Institute of Condensed Matter and Nanosciences (ICMN), Université catholique de Louvain (UCLouvain) Louvain-la-Neuve B-1348 Belgium luc.piraux@uclouvain.be.; R&D Center for Materials and Electronic & Optoelectronic Devices (MDEO), Faculty of Physics, University of Bucharest Măgurele 077125 Ilfov Romania vlad.antohe@fizica.unibuc.ro.
Jazyk: angličtina
Zdroj: Nanoscale advances [Nanoscale Adv] 2024 Oct 22. Date of Electronic Publication: 2024 Oct 22.
DOI: 10.1039/d4na00735b
Abstrakt: Arrays of thermoelectric nanowires embedded in organic films are attracting increasing interest to fabricate flexible thermoelectric devices with adjustable dimensions and complex shapes, useful for sustainable power sources of portable electronic devices and wireless sensor networks. Here, we report the electrochemical synthesis of interconnected bismuth-antimony (Bi 1- x Sb x ) nanowires (with 0.06 < x < 0.15) within the branched cylindrical nanopores of polycarbonate membranes. The influence of temperature and magnetic field on the electrical and thermoelectric properties was studied by considering electric and thermal currents flowing in the plane of the films. We show that short annealing times with temperature up to 250 °C of the nanowire-based nanocomposite lead to a large increase in the thermoelectric power, reaching values up to -80 μV K -1 at room temperature, which are comparable to those of bulk Bi-Sb alloys. In addition, we report Hall effect measurements on crossed nanowires, made possible for the first time by the remarkable electrical connectivity of the nanowire network. These measurements, combined with variations in temperature and under the magnetic field of the electrical resistance, indicate that the interconnected networks of Bi 1- x Sb x nanowires after thermal annealing behave like n -type, narrow band gap semiconductors. Overall, the electrical and thermoelectric properties near the ambient temperature of the heat-treated Bi 1- x Sb x nanowire networks are similar to those of bulk polycrystalline Bi-Sb alloys, which are well-known thermoelectric materials exhibiting optimal performance near and below room temperature.
Competing Interests: There are no conflicts to declare.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
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