Manipulating the morphology of the nano oxide domain in AuCu-iron oxide dumbbell-like nanocomposites as a tool to modify magnetic properties.

Autor:	Najafishirtari S; Nanochemistry Department, Istituto Italiano di Tecnologia Via Morego 30 16163 Genoa Italy massimo.colombo@iit.it., Lak A; Nanomaterials for Biomedical Applications, Istituto Italiano di Tecnologia Via Morego 30 16163 Genoa Italy., Guglieri C; Elettra Sincrotrone 34149 Basovizza Trieste Italy., Marras S; Materials Characterization Facility, Istituto Italiano di Tecnologia Via Morego 30 16163 Genoa Italy., Brescia R; Electron Microscopy Facility, Istituto Italiano di Tecnologia Via Morego 30 16163 Genoa Italy., Fiorito S; Nanomaterials for Biomedical Applications, Istituto Italiano di Tecnologia Via Morego 30 16163 Genoa Italy.; Università degli Studi di Genova Via Dodecaneso, 31 16146 Genoa Italy., Sadrollahi E; Institut für Physik der Kondensierten Materie, Technische Universität Braunschweig 38106 Braunschweig Germany., Litterst FJ; Institut für Physik der Kondensierten Materie, Technische Universität Braunschweig 38106 Braunschweig Germany., Pellegrino T; Nanomaterials for Biomedical Applications, Istituto Italiano di Tecnologia Via Morego 30 16163 Genoa Italy., Manna L; Nanochemistry Department, Istituto Italiano di Tecnologia Via Morego 30 16163 Genoa Italy massimo.colombo@iit.it., Colombo M; Nanochemistry Department, Istituto Italiano di Tecnologia Via Morego 30 16163 Genoa Italy massimo.colombo@iit.it.
Jazyk:	angličtina
Zdroj:	RSC advances [RSC Adv] 2018 Jun 19; Vol. 8 (40), pp. 22411-22421. Date of Electronic Publication: 2018 Jun 19 (Print Publication: 2018).
DOI:	10.1039/c8ra03399d
Abstrakt:	We report the colloidal synthesis of hybrid dumbbell-like nanocrystals (NCs) which feature a plasmonic metal domain (M) attached to a morphologically-tunable magnetic oxide domain (MOx). We highlight how the modulation of the amount of oleic acid (OlAc) in the synthesis mixture influences the final composition of the M domain, the morphology of the MOx domain and, consequently, the magnetic properties of the hetero-structures. In the presence of high amounts of OlAc, a crystalline, magnetite MOx is mainly formed, coupled with a partial dealloying between Au and Cu in the M domain. Decreasing the amount of OlAc preserved the AuCu alloy and resulted in the formation of core-shell structures in the MOx. Here, a disordered, poorly crystalline, glass-like maghemite shell was coupled with a highly disordered iron rich core. An investigation into the magnetic properties revealed that the disordered phase was likely responsible for the observed exchange bias, rather than the interfacial stress between the M and MOx. Competing Interests: There are no conflicts to declare. (This journal is © The Royal Society of Chemistry.)
Databáze:	MEDLINE
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