Compact Ag@Fe3O4 Core-shell Nanoparticles by Means of Single-step Thermal Decomposition Reaction

Autor(es)

Brollo, Maria Eugenia F. ^[1] ; Lopez-Ruiz, Roman ^[1] ; Muraca, Diego ^[1] ; Figueroa, Santiago J. A. ^[2] ; Pirota, Kleber R. ^[1] ; Knobel, Marcelo ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas UNICAMP, Inst Fis Gleb Wataghin, BR-13083970 Campinas, SP - Brazil

^[2] Brazilian Ctr Energy & Mat CNPEM, Brazilian Synchrotron Light Lab LNLS, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SCIENTIFIC REPORTS; v. 4, OCT 30 2014.
• Citações Web of Science: 33

Resumo

A temperature pause introduced in a simple single-step thermal decomposition of iron, with the presence of silver seeds formed in the same reaction mixture, gives rise to novel compact heterostructures: brick-like Ag@Fe3O4 core-shell nanoparticles. This novel method is relatively easy to implement, and could contribute to overcome the challenge of obtaining a multifunctional heteroparticle in which a noble metal is surrounded by magnetite. Structural analyses of the samples show 4 nm silver nanoparticles wrapped within compact cubic external structures of Fe oxide, with curious rectangular shape. The magnetic properties indicate a near superparamagnetic like behavior with a weak hysteresis at room temperature. The value of the anisotropy involved makes these particles candidates to potential applications in nanomedicine. (AU)

• Processo FAPESP: 11/01235-6 - Estudo de sistemas granulares magnéticos: efeitos de interações dipolares e de superfície em nanopartículas magnéticas e ferrogel
• Beneficiário: Diego Muraca
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/13275-8 - Efeitos de tamanho finito, síntese e propriedades magnéticas de nanofios modulados
• Beneficiário: Román López Ruiz
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado