Web of Science: 42 cites, Scopus: 41 cites, Google Scholar: cites,
Seeded Growth Synthesis of Au-Fe3O4 Heterostructured Nanocrystals : Rational Design and Mechanistic Insights
Fantechi, Elvira (Institut Català de Nanociència i Nanotecnologia)
Gómez Roca, Alejandro (Institut Català de Nanociència i Nanotecnologia)
Sepúlveda, Borja (Institut Català de Nanociència i Nanotecnologia)
Torruella, Pau (Universitat de Barcelona. Departament d'Electrònica)
Estrade, Sonia (Universitat de Barcelona. Departament d'Electrònica)
Peiro, Francesca (Universitat de Barcelona. Departament d'Electrònica)
Coy, Emerson (Adam Mickiewicz University)
Jurga, Stefan (Adam Mickiewicz University)
Bastús, Neus G (Institut Català de Nanociència i Nanotecnologia)
Nogués, Josep (Institut Català de Nanociència i Nanotecnologia)
Puntes, Víctor (Institut Català de Nanociència i Nanotecnologia)

Data: 2017
Resum: Multifunctional hybrid nanoparticles comprising two or more entities with different functional properties are gaining ample significance in industry and research. Due to its combination of properties, a particularly appealing example is Au-FeO composite nanoparticles. Here we present an in-depth study of the synthesis of Au-FeO heterostructured nanocrystals (HNCs) by thermal decomposition of iron precursors in the presence of preformed 10 nm Au seeds. The role of diverse reaction parameters on the HNCs formation was investigated using two different precursors: iron pentacarbonyl (Fe(CO)) and iron acetylacetonate (Fe(acac)). The reaction conditions promoting the heterogeneous nucleation of FeO onto Au seeds were found to significantly differ depending on the precursor chosen, where Fe(acac) is considerably more sensitive to the variation of the parameters than Fe(CO) and more subject to homogeneous nucleation processes with the consequent formation of isolated iron oxide nanocrystals (NCs). The role of the surfactants was also crucial in the formation of well-defined and monodisperse HNCs by regulating the access to the Au surface. Similarly, the variations of the [Fe]/[Au] ratio, temperature, and employed solvent were found to act on the mean size and the morphology of the obtained products. Importantly, while the optical properties are rather sensitive to the final morphology, the magnetic ones are rather similar for the different types of obtained HNCs. The surface functionalization of dimer-like HNCs with silica allows their dispersion in aqueous media, opening the path to their use in biomedical applications.
Ajuts: AGAUR/2014/SGR-1015
AGAUR/2014/SGR-612
AGAUR/2014/SGR-672
MINECO/MAT2013-48628-R
MINECO/MAT2013-41506
MINECO/MAT2015-70725-R
MINECO/MAT2016-79455-P
MINECO/MAT2016-77391-R
European Commission 685817
MINECO/RYC-2012-10991
European Commission 322153
MINECO/SEV-2013-0295
Drets: Tots els drets reservats.
Llengua: Anglès
Document: Article ; recerca ; Versió sotmesa a revisió
Matèria: Biomedical applications ; Composite nanoparticles ; Dispersion in aqueous media ; Functional properties ; Heterogeneous nucleation ; Homogeneous nucleation ; Iron oxide nanocrystals ; Surface Functionalization
Publicat a: Chemistry of materials, Vol. 29, Issue 9 (May 2017) , p. 4022-4035, ISSN 1520-5002

DOI: 10.1021/acs.chemmater.7b00608


Preprint
37 p, 2.3 MB

El registre apareix a les col·leccions:
Documents de recerca > Documents dels grups de recerca de la UAB > Centres i grups de recerca (producció científica) > Ciències > Institut Català de Nanociència i Nanotecnologia (ICN2)
Articles > Articles de recerca
Articles > Articles publicats

 Registre creat el 2019-10-21, darrera modificació el 2021-08-01



   Favorit i Compartir