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Design of Bistable Gold@Spin‐Crossover Core-Shell Nanoparticles Showing Large Electrical Responses for the Spin Switching

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Design of Bistable Gold@Spin‐Crossover Core-Shell Nanoparticles Showing Large Electrical Responses for the Spin Switching

dc.contributor.author	Torres-Cavanillas, Ramón
dc.contributor.author	Sanchis Gual, Roger
dc.contributor.author	Dugay, Julien
dc.contributor.author	Coronado-Puchau, Marc
dc.contributor.author	Giménez Marqués, Mónica
dc.contributor.author	Coronado Miralles, Eugenio
dc.date.accessioned	2020-04-21T12:06:05Z
dc.date.available	2020-04-21T12:06:05Z
dc.date.issued	2019
dc.identifier.citation	Torres-Cavanillas, Ramón Sanchis Gual, Roger Dugay, Julien Coronado-Puchau, Marc Giménez Marqués, Mónica Coronado Miralles, Eugenio 2019 Design of Bistable Gold@Spin‐Crossover Core-Shell Nanoparticles Showing Large Electrical Responses for the Spin Switching Advanced Materials 31 27 1900039
dc.identifier.uri	https://hdl.handle.net/10550/73966
dc.description.abstract	A simple chemical protocol to prepare core-shell gold@spin-crossover (Au@SCO) nanoparticles (NPs) based on the 1D spin-crossover [Fe(Htrz)2(trz)](BF4) coordination polymer is reported. The synthesis relies on a two-step approach consisting of a partial surface ligand substitution of the citrate-stabilized Au NPs followed by the controlled growth of a very thin layer of the SCO polymer. As a result, colloidally stable core@ shell spherical NPs with a Au core of ca. 12 nm and a thin SCO shell 4 nm thick, are obtained, exhibiting a narrow distribution in sizes. Differential scanning calorimetry proves that a cooperative spin transition in the range 340-360 K is maintained in these Au@SCO NPs, in full agreement with the values reported for pristine 4 nm SCO NPs. Temperature-dependent chargetransport measurements of an electrical device based on assemblies of these Au@SCO NPs also support this spin transition. Thus, a large change in conductance upon spin state switching, as compared with other memory devices based on the pristine SCO NPs, is detected. This results in a large improvement in the sensitivity of the device to the spin transition, with values for the ON/OFF ratio which are an order of magnitude better than the best ones obtained in previous SCO devices.
dc.language.iso	eng
dc.relation.ispartof	Advanced Materials, 2019, vol. 31, num. 27, p. 1900039
dc.subject	Nanotecnologia
dc.subject	Electrònica molecular
dc.subject	Ciència dels materials
dc.title	Design of Bistable Gold@Spin‐Crossover Core-Shell Nanoparticles Showing Large Electrical Responses for the Spin Switching
dc.type	journal article	es_ES
dc.date.updated	2020-04-21T12:06:05Z
dc.identifier.doi	10.1002/adma.201900039
dc.identifier.idgrec	132302
dc.rights.accessRights	open access	es_ES