Abstract
Co-Pd alloy nanoparticles with the surface modified with carboxylic acid functional groups are prepared to connect the nanoparticles with a cross-linkage of calcium ion (Ca2+). The morphology of the resulting nanoparticles can be controlled with the Ca2+ ion concentration. At diluted concentrations, a dimer structure is formed, in which constituent nanoparticles are coupled ferromagnetically with the aid of dipole-dipole interaction. At high concentrations, many nanoparticles are multiple-cross-linked, resulting in forming highly packed three-dimensional structures. The magnetization is strongly enhanced 8 times as large as that of pristine sample owing to dipolar ferromagnetism in the 3D structures.
Original language | English |
---|---|
Pages (from-to) | 8971-8975 |
Number of pages | 5 |
Journal | Journal of Physical Chemistry C |
Volume | 115 |
Issue number | 18 |
DOIs | |
Publication status | Published - 2011 May 12 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Energy(all)
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films