Monodispersed Core−Shell Fe3O4@Au Nanoparticles
Citations Over TimeTop 1% of 2005 papers
Abstract
The ability to synthesize and assemble monodispersed core-shell nanoparticles is important for exploring the unique properties of nanoscale core, shell, or their combinations in technological applications. This paper describes findings of an investigation of the synthesis and assembly of core (Fe(3)O(4))-shell (Au) nanoparticles with high monodispersity. Fe(3)O(4) nanoparticles of selected sizes were used as seeding materials for the reduction of gold precursors to produce gold-coated Fe(3)O(4) nanoparticles (Fe(3)O(4)@Au). Experimental data from both physical and chemical determinations of the changes in particle size, surface plasmon resonance optical band, core-shell composition, surface reactivity, and magnetic properties have confirmed the formation of the core-shell nanostructure. The interfacial reactivity of a combination of ligand-exchanging and interparticle cross-linking was exploited for molecularly mediated thin film assembly of the core-shell nanoparticles. The SQUID data reveal a decrease in magnetization and blocking temperature and an increase in coercivity for Fe(3)O(4)@Au, reflecting the decreased coupling of the magnetic moments as a result of the increased interparticle spacing by both gold and capping shells. Implications of the findings to the design of interfacial reactivities via core-shell nanocomposites for magnetic, catalytic, and biological applications are also briefly discussed.
Related Papers
- → The effect of layer thickness and immobilization chemistry on the detection of CRP in LSPR assays(2022)18 cited
- → Time effect on the red shift of surface plasmonic resonance core-shell SiO2: Gold nanoparticles (AuNPs)(2019)6 cited
- Detection of volatile organic compound gas using localized surface plasmon resonance of gold nanoparticles(2011)
- → Study of the effect of defect sizes and their distribution on the coercivity of magnetic media(1994)8 cited
- → Angular Dependence of Coercivity in Sm2Fe17Cx Magnets(2000)