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

Author(s)

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

Affiliation

^[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

• Document type: Journal article
• Source: SCIENTIFIC REPORTS; v. 4, OCT 30 2014.
• Web of Science Citations: 33

Abstract

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)

• FAPESP's process: 11/01235-6 - Effects of dipolar interactions and surface in magnetic granular systems and magnetic nanoparticles on ferrogels
• Grantee: Diego Muraca
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 13/13275-8 - Finite-size effects, synthesis and magnetic properties of heterogeneous modelled nanowires
• Grantee: Román López Ruiz
• Support Opportunities: Scholarships in Brazil - Post-Doctoral