Room temperature conductance switching in a molecular iron(iii) spin crossover junction

Molecular junctions are important because their operating mechanisms are complementary to semiconductor based technologies potentially enabling new technologies. In this context, it is important to develop molecular switches operating at room temperature that do not suffer from stochastic effects. S...

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Autores: Karuppannan, Senthil Kumar, Martín Rodríguez, Alejandro, Ruiz Sabín, Eliseo, Harding, Phimphaka, Harding, David J., Yu, Xiaojiang, Tadich, Anton, Cowie, Bruce, Qi, Dongchen, Nijhuis, Christian A.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2021
País:España
Institución:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/179854
Acceso en línea:https://hdl.handle.net/2445/179854
Access Level:acceso abierto
Palabra clave:Molècules
Metalls de transició
Ferro
Molecules
Transition metals
Iron
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spelling Room temperature conductance switching in a molecular iron(iii) spin crossover junctionKaruppannan, Senthil KumarMartín Rodríguez, AlejandroRuiz Sabín, EliseoHarding, PhimphakaHarding, David J.Yu, XiaojiangTadich, AntonCowie, BruceQi, DongchenNijhuis, Christian A.MolèculesMetalls de transicióFerroMoleculesTransition metalsIronMolecular junctions are important because their operating mechanisms are complementary to semiconductor based technologies potentially enabling new technologies. In this context, it is important to develop molecular switches operating at room temperature that do not suffer from stochastic effects. Spin crossover (SCO) molecules are promising candidates to develop stable electrical switches, but so far it has been challenging to assemble molecular devices with robust SCO functionality due to the lack of control over the molecule¿electrode coupling strength diminishing the SCO functionality. This paper reports molecular tunnel junctions with SCO molecules, [FeIII(qsal-I)2]NTf2 (qsal-I = 4-iodo-2-[(8-quinolylimino)methyl]phenolate) adsorbed on graphene surfaces via physisorption with room temperature conductance switching of one order of magnitude associated with the high and low spin states of the SCO complex. Normalized conductance analysis of the current-voltage characteristics as a function of temperature reveals that the mechanism of charge transport across the SCO molecule is dominated by coherent tunneling. Temperature-dependent X-ray absorption spectroscopy and density functional theory confirm the SCO complex retains its SCO functionality on the surface implying that physisorbed molecule¿electrode contacts provide a good trade-off between junction stability while retaining SCO switching capability. These results could open the door to design other types of molecular devices based on SCO compounds.Royal Society of Chemistry2021info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/179854Articles publicats en revistes (Química Inorgànica i Orgànica)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a: https://doi.org/10.1039/D0SC04555AChemical Science, 2021, vol. 12, p. 2381-2388https://doi.org/10.1039/D0SC04555A(c) Karuppannan, Senthil Kumar et al., 2021http://creativecommons.org/licenses/by-nc/3.0/es/info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/1798542026-05-27T06:46:51Z
dc.title.none.fl_str_mv Room temperature conductance switching in a molecular iron(iii) spin crossover junction
title Room temperature conductance switching in a molecular iron(iii) spin crossover junction
spellingShingle Room temperature conductance switching in a molecular iron(iii) spin crossover junction
Karuppannan, Senthil Kumar
Molècules
Metalls de transició
Ferro
Molecules
Transition metals
Iron
title_short Room temperature conductance switching in a molecular iron(iii) spin crossover junction
title_full Room temperature conductance switching in a molecular iron(iii) spin crossover junction
title_fullStr Room temperature conductance switching in a molecular iron(iii) spin crossover junction
title_full_unstemmed Room temperature conductance switching in a molecular iron(iii) spin crossover junction
title_sort Room temperature conductance switching in a molecular iron(iii) spin crossover junction
dc.creator.none.fl_str_mv Karuppannan, Senthil Kumar
Martín Rodríguez, Alejandro
Ruiz Sabín, Eliseo
Harding, Phimphaka
Harding, David J.
Yu, Xiaojiang
Tadich, Anton
Cowie, Bruce
Qi, Dongchen
Nijhuis, Christian A.
author Karuppannan, Senthil Kumar
author_facet Karuppannan, Senthil Kumar
Martín Rodríguez, Alejandro
Ruiz Sabín, Eliseo
Harding, Phimphaka
Harding, David J.
Yu, Xiaojiang
Tadich, Anton
Cowie, Bruce
Qi, Dongchen
Nijhuis, Christian A.
author_role author
author2 Martín Rodríguez, Alejandro
Ruiz Sabín, Eliseo
Harding, Phimphaka
Harding, David J.
Yu, Xiaojiang
Tadich, Anton
Cowie, Bruce
Qi, Dongchen
Nijhuis, Christian A.
author2_role author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Molècules
Metalls de transició
Ferro
Molecules
Transition metals
Iron
topic Molècules
Metalls de transició
Ferro
Molecules
Transition metals
Iron
description Molecular junctions are important because their operating mechanisms are complementary to semiconductor based technologies potentially enabling new technologies. In this context, it is important to develop molecular switches operating at room temperature that do not suffer from stochastic effects. Spin crossover (SCO) molecules are promising candidates to develop stable electrical switches, but so far it has been challenging to assemble molecular devices with robust SCO functionality due to the lack of control over the molecule¿electrode coupling strength diminishing the SCO functionality. This paper reports molecular tunnel junctions with SCO molecules, [FeIII(qsal-I)2]NTf2 (qsal-I = 4-iodo-2-[(8-quinolylimino)methyl]phenolate) adsorbed on graphene surfaces via physisorption with room temperature conductance switching of one order of magnitude associated with the high and low spin states of the SCO complex. Normalized conductance analysis of the current-voltage characteristics as a function of temperature reveals that the mechanism of charge transport across the SCO molecule is dominated by coherent tunneling. Temperature-dependent X-ray absorption spectroscopy and density functional theory confirm the SCO complex retains its SCO functionality on the surface implying that physisorbed molecule¿electrode contacts provide a good trade-off between junction stability while retaining SCO switching capability. These results could open the door to design other types of molecular devices based on SCO compounds.
publishDate 2021
dc.date.none.fl_str_mv 2021
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/179854
url https://hdl.handle.net/2445/179854
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1039/D0SC04555A
Chemical Science, 2021, vol. 12, p. 2381-2388
https://doi.org/10.1039/D0SC04555A
dc.rights.none.fl_str_mv (c) Karuppannan, Senthil Kumar et al., 2021
http://creativecommons.org/licenses/by-nc/3.0/es/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) Karuppannan, Senthil Kumar et al., 2021
http://creativecommons.org/licenses/by-nc/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Royal Society of Chemistry
publisher.none.fl_str_mv Royal Society of Chemistry
dc.source.none.fl_str_mv Articles publicats en revistes (Química Inorgànica i Orgànica)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300724

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