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Emergent Insulator–Metal Transition with Tunable Optical and Electrical Gap in Thin Films of a Molecular Conducting Composite

[Image: see text] Composites exhibit unique synergistic properties emerging when components with different properties are combined. The tuning of the energy bandgap in the electronic structure of the material allows designing tailor-made systems with desirable mechanical, electrical, optical, and/or...

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Autores principales: Pfattner, Raphael, Laukhina, Elena, Li, Jinghai, Zaffino, Rossella L., Aliaga-Alcalde, Núria, Mas-Torrent, Marta, Laukhin, Vladimir, Veciana, Jaume
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2022
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9134344/
https://www.ncbi.nlm.nih.gov/pubmed/35647553
http://dx.doi.org/10.1021/acsaelm.2c00224
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author Pfattner, Raphael
Laukhina, Elena
Li, Jinghai
Zaffino, Rossella L.
Aliaga-Alcalde, Núria
Mas-Torrent, Marta
Laukhin, Vladimir
Veciana, Jaume
author_facet Pfattner, Raphael
Laukhina, Elena
Li, Jinghai
Zaffino, Rossella L.
Aliaga-Alcalde, Núria
Mas-Torrent, Marta
Laukhin, Vladimir
Veciana, Jaume
author_sort Pfattner, Raphael
collection PubMed
description [Image: see text] Composites exhibit unique synergistic properties emerging when components with different properties are combined. The tuning of the energy bandgap in the electronic structure of the material allows designing tailor-made systems with desirable mechanical, electrical, optical, and/or thermal properties. Here, we study an emergent insulator–metal transition at room temperature in bilayered (BL) thin-films comprised of polycarbonate/molecular-metal composites. Temperature-dependent resistance measurements allow monitoring of the electrical bandgap, which is in agreement with the optical bandgap extracted by optical absorption spectroscopy. The semiconductor-like properties of BL films, made with bis(ethylenedithio)-tetrathiafulvalene (BEDT-TTF or ET) α-ET(2)I(3) (nano)microcrystals as two-dimensional molecular conductor on one side and insulator polycarbonate as a second ingredient, are attributed to an emergent phenomenon equivalent to the transition from an insulator to a metal. This made it possible to obtain semiconducting BL films with tunable electrical/optical bandgaps ranging from 0 to 2.9 eV. A remarkable aspect is the similarity close to room temperature of the thermal and mechanical properties of both composite components, making these materials ideal candidates to fabricate flexible and soft sensors for stress, pressure, and temperature aiming at applications in wearable human health care and bioelectronics.
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spelling pubmed-91343442022-05-27 Emergent Insulator–Metal Transition with Tunable Optical and Electrical Gap in Thin Films of a Molecular Conducting Composite Pfattner, Raphael Laukhina, Elena Li, Jinghai Zaffino, Rossella L. Aliaga-Alcalde, Núria Mas-Torrent, Marta Laukhin, Vladimir Veciana, Jaume ACS Appl Electron Mater [Image: see text] Composites exhibit unique synergistic properties emerging when components with different properties are combined. The tuning of the energy bandgap in the electronic structure of the material allows designing tailor-made systems with desirable mechanical, electrical, optical, and/or thermal properties. Here, we study an emergent insulator–metal transition at room temperature in bilayered (BL) thin-films comprised of polycarbonate/molecular-metal composites. Temperature-dependent resistance measurements allow monitoring of the electrical bandgap, which is in agreement with the optical bandgap extracted by optical absorption spectroscopy. The semiconductor-like properties of BL films, made with bis(ethylenedithio)-tetrathiafulvalene (BEDT-TTF or ET) α-ET(2)I(3) (nano)microcrystals as two-dimensional molecular conductor on one side and insulator polycarbonate as a second ingredient, are attributed to an emergent phenomenon equivalent to the transition from an insulator to a metal. This made it possible to obtain semiconducting BL films with tunable electrical/optical bandgaps ranging from 0 to 2.9 eV. A remarkable aspect is the similarity close to room temperature of the thermal and mechanical properties of both composite components, making these materials ideal candidates to fabricate flexible and soft sensors for stress, pressure, and temperature aiming at applications in wearable human health care and bioelectronics. American Chemical Society 2022-05-11 2022-05-24 /pmc/articles/PMC9134344/ /pubmed/35647553 http://dx.doi.org/10.1021/acsaelm.2c00224 Text en © 2022 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Pfattner, Raphael
Laukhina, Elena
Li, Jinghai
Zaffino, Rossella L.
Aliaga-Alcalde, Núria
Mas-Torrent, Marta
Laukhin, Vladimir
Veciana, Jaume
Emergent Insulator–Metal Transition with Tunable Optical and Electrical Gap in Thin Films of a Molecular Conducting Composite
title Emergent Insulator–Metal Transition with Tunable Optical and Electrical Gap in Thin Films of a Molecular Conducting Composite
title_full Emergent Insulator–Metal Transition with Tunable Optical and Electrical Gap in Thin Films of a Molecular Conducting Composite
title_fullStr Emergent Insulator–Metal Transition with Tunable Optical and Electrical Gap in Thin Films of a Molecular Conducting Composite
title_full_unstemmed Emergent Insulator–Metal Transition with Tunable Optical and Electrical Gap in Thin Films of a Molecular Conducting Composite
title_short Emergent Insulator–Metal Transition with Tunable Optical and Electrical Gap in Thin Films of a Molecular Conducting Composite
title_sort emergent insulator–metal transition with tunable optical and electrical gap in thin films of a molecular conducting composite
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9134344/
https://www.ncbi.nlm.nih.gov/pubmed/35647553
http://dx.doi.org/10.1021/acsaelm.2c00224
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