Nano-fried-eggs: Structural, optical, and magnetic characterization of physically prepared iron-silver nanoparticles

Autor(es)

Ramade, Julien ^[1] ; Troc, Nicolas ^[1] ; Boisron, Olivier ^[1] ; Pellarin, Michel ^[1] ; Lebault, Marie-Ange ^[1] ; Cottancin, Emmanuel ^[1] ; Oiko, Vitor T. A. ^[2] ; Gomes, Rafael Cabreira ^[2] ; Rodrigues, Varlei ^[2] ; Hillenkamp, Matthias ^{[2, 1]}

Afiliação do(s) autor(es)

^[1] Univ Claude Bernard Lyon 1, Univ Lyon, CNRS, UMR5306, Inst Lumiere Matiere, F-69622 Villeurbanne - France

^[2] Univ Estadual Campinas, Inst Fis Gleb Wataghin, CP 6165, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: NANO RESEARCH; v. 11, n. 11, p. 6074-6085, NOV 2018.
• Citações Web of Science: 2

Resumo

The prospect of combining both magnetic and plasmonic properties in a single nanoparticle promises both valuable insights on the properties of such systems from a fundamental viewpoint and numerous possibilities for technological applications. However, the combination of two of the most prominent metallic candidatesiron and silverhas presented numerous experimental difficulties because their thermodynamic properties impede miscibility and even coalescence. Herein, we present the thorough characterization of physically prepared Fe50Ag50 nanoparticles embedded in carbon and silica matrices via electron microscopy, optical spectroscopy, magnetometry and synchrotron-based X-ray spectroscopy. Iron and silver segregate completely into structures resembling fried eggs, with a nearly spherical, crystallized silver part surrounded by an amorphous structure of iron carbide or oxide, depending on the environment of the particles. Consequently, the particles exhibit both plasmonic absorption corresponding to the silver nanospheres in an oxide environment and a reduced but measurable magnetic response. The suitability of such nanoparticles for technological applications is discussed from the viewpoint of their high chemical reactivity with their environment. (AU)

• Processo FAPESP: 16/12807-4 - Camadas de polímero com incorporação de nanopartículas metálicas: plataforma para construção de bio(sensores)
• Beneficiário: Osvaldo Novais de Oliveira Junior
• Modalidade de apoio: Auxílio à Pesquisa - Pesquisador Visitante - Internacional
• Processo FAPESP: 13/14262-7 - Filmes nanoestruturados de materiais de interesse biológico
• Beneficiário: Osvaldo Novais de Oliveira Junior
• Modalidade de apoio: Auxílio à Pesquisa - Temático