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Magnetic interactions in spin-labeled Au nanoparticles

AutorLloveras, Vega ; Badetti, E; Chechik, V; Vidal Gancedo, José
Fecha de publicación18-sep-2014
EditorAmerican Chemical Society
CitaciónJournal of Physical Chemistry C 118(37): 21622- 21629 (2014)
Resumen© 2014 American Chemical Society. A series of gold nanoparticles functionalized with TEMPO-modified disulfide 2 have been prepared and studied by electron paramagnetic resonance (EPR) spectroscopy, UV-vis, transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX), and thermogravimetric analysis (TGA). In order to increase the packing of spin labels on the particle surface, heat-induced size evolution and ligand exchange reactions were used. The optimized synthesis included a one-pot reaction at room temperature that led to gold nanoparticles with a controlled large size (ca. 7 nm) and high coverage of radicals. These nanoparticles showed a |Δms| = 2 transition at half-field, which gives direct evidence of the presence of a high-spin state and permits an EPR study of the nature of the magnetic coupling between the spins. The results showed dominant antiferromagnetic interactions between radicals, but at lower temperatures, a ferromagnetic contribution was observed.
Identificadoresdoi: 10.1021/jp505231w
e-issn: 1932-7455
issn: 1932-7447
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