Nanotubes from Oxide-based Misfit Family: the case of Calcium Cobalt Oxide

Misfit layered compounds (MLCs) have generated significant interest in recent years as potential thermoelectric materials. MLC nanotubes could reveal behavior that is entirely different from the bulk material. Recently, new chemical strategies were exploited for the synthesis of nanotubular forms of...

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Autores: Panchakarla, L. S., Lajaunie, L., Ramasubramaniam, A., Arenal, R., Tenne, R.
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2016
País:España
Institución:Universidad de Zaragoza
Repositorio:Zaguán. Repositorio Digital de la Universidad de Zaragoza
OAI Identifier:oai:zaguan.unizar.es:70179
Acceso en línea:http://zaguan.unizar.es/record/70179
Access Level:acceso abierto
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spelling Nanotubes from Oxide-based Misfit Family: the case of Calcium Cobalt OxidePanchakarla, L. S.Lajaunie, L.Ramasubramaniam, A.Arenal, R.Tenne, R.Misfit layered compounds (MLCs) have generated significant interest in recent years as potential thermoelectric materials. MLC nanotubes could reveal behavior that is entirely different from the bulk material. Recently, new chemical strategies were exploited for the synthesis of nanotubular forms of chalcogenide-based MLCs, which are promising candidates for thermoelectric materials. However, analogous synthesis of oxide-based MLC nanotubes has not been demonstrated until now. Here, we report a chemical strategy for synthesis of cobalt-oxide-based misfit nanotubes. A combination of high-resolution (scanning) transmission electron microscopy (including image simulations), spatially resolved electron energy-loss spectroscopy, electron diffraction, and density functional theory (DFT) calculations is used to discover the formation of a phase within these nanotubes that differs significantly from bulk calcium cobaltite MLCs. Furthermore, DFT calculations show that this phase is semiconducting with a band gap in excess of 1 eV, unlike bulk calcium cobaltite MLCs, which are known to be metallic. Through systematic experiments, we propose a formation mechanism for these nanotubes that could also apply more generally to realizing other oxide-based MLC nanotubes.2016info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttp://zaguan.unizar.es/record/70179reponame:Zaguán. Repositorio Digital de la Universidad de Zaragozainstname:Universidad de ZaragozaInglésinfo:eu-repo/grantAgreement/ES/MINECO/FIS2013-46159-C3-3-PThis project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 696656-GrapheneCore1info:eu-repo/grantAgreement/EC/H2020/696656This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 642742-Enabling Excellenceinfo:eu-repo/grantAgreement/EC/H2020/642742info:eu-repo/grantAgreement/EC/FP7/312483info:eu-repo/semantics/openAccessoai:zaguan.unizar.es:701792026-05-29T13:59:51Z
dc.title.none.fl_str_mv Nanotubes from Oxide-based Misfit Family: the case of Calcium Cobalt Oxide
title Nanotubes from Oxide-based Misfit Family: the case of Calcium Cobalt Oxide
spellingShingle Nanotubes from Oxide-based Misfit Family: the case of Calcium Cobalt Oxide
Panchakarla, L. S.
title_short Nanotubes from Oxide-based Misfit Family: the case of Calcium Cobalt Oxide
title_full Nanotubes from Oxide-based Misfit Family: the case of Calcium Cobalt Oxide
title_fullStr Nanotubes from Oxide-based Misfit Family: the case of Calcium Cobalt Oxide
title_full_unstemmed Nanotubes from Oxide-based Misfit Family: the case of Calcium Cobalt Oxide
title_sort Nanotubes from Oxide-based Misfit Family: the case of Calcium Cobalt Oxide
dc.creator.none.fl_str_mv Panchakarla, L. S.
Lajaunie, L.
Ramasubramaniam, A.
Arenal, R.
Tenne, R.
author Panchakarla, L. S.
author_facet Panchakarla, L. S.
Lajaunie, L.
Ramasubramaniam, A.
Arenal, R.
Tenne, R.
author_role author
author2 Lajaunie, L.
Ramasubramaniam, A.
Arenal, R.
Tenne, R.
author2_role author
author
author
author
description Misfit layered compounds (MLCs) have generated significant interest in recent years as potential thermoelectric materials. MLC nanotubes could reveal behavior that is entirely different from the bulk material. Recently, new chemical strategies were exploited for the synthesis of nanotubular forms of chalcogenide-based MLCs, which are promising candidates for thermoelectric materials. However, analogous synthesis of oxide-based MLC nanotubes has not been demonstrated until now. Here, we report a chemical strategy for synthesis of cobalt-oxide-based misfit nanotubes. A combination of high-resolution (scanning) transmission electron microscopy (including image simulations), spatially resolved electron energy-loss spectroscopy, electron diffraction, and density functional theory (DFT) calculations is used to discover the formation of a phase within these nanotubes that differs significantly from bulk calcium cobaltite MLCs. Furthermore, DFT calculations show that this phase is semiconducting with a band gap in excess of 1 eV, unlike bulk calcium cobaltite MLCs, which are known to be metallic. Through systematic experiments, we propose a formation mechanism for these nanotubes that could also apply more generally to realizing other oxide-based MLC nanotubes.
publishDate 2016
dc.date.none.fl_str_mv 2016
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://zaguan.unizar.es/record/70179
url http://zaguan.unizar.es/record/70179
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv info:eu-repo/grantAgreement/ES/MINECO/FIS2013-46159-C3-3-P
This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 696656-GrapheneCore1
info:eu-repo/grantAgreement/EC/H2020/696656
This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 642742-Enabling Excellence
info:eu-repo/grantAgreement/EC/H2020/642742
info:eu-repo/grantAgreement/EC/FP7/312483
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv
publisher.none.fl_str_mv
dc.source.none.fl_str_mv reponame:Zaguán. Repositorio Digital de la Universidad de Zaragoza
instname:Universidad de Zaragoza
instname_str Universidad de Zaragoza
reponame_str Zaguán. Repositorio Digital de la Universidad de Zaragoza
collection Zaguán. Repositorio Digital de la Universidad de Zaragoza
repository.name.fl_str_mv
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