Compact Ag@Fe3O4 core-shell nanoparticles by means of single-step thermal decomposition reaction

• Grant number: 14/21400-0
• Support Opportunities: Regular Research Grants - Publications - Scientific article
• Start date: November 01, 2014
• End date: April 30, 2015
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Marcelo Knobel
• Grantee: Marcelo Knobel
• Host Institution: Instituto de Física Gleb Wataghin (IFGW). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
• Associated research grant: 12/04870-7 - Studies of novel complex and advanced materials, AP.TEM

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@Fe 3 O 4 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 silvernanoparticles wrapped within compact cubic external structures of Fe oxide, withcurious 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 potentialapplications in nanomedicine. (AU)