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dc.contributor.authorLloveras, Vega-
dc.contributor.authorBadetti, E-
dc.contributor.authorChechik, V-
dc.contributor.authorVidal Gancedo, José-
dc.identifierdoi: 10.1021/jp505231w-
dc.identifiere-issn: 1932-7455-
dc.identifierissn: 1932-7447-
dc.identifier.citationJournal of Physical Chemistry C 118(37): 21622- 21629 (2014)-
dc.description.abstract© 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.-
dc.description.sponsorshipThis work was supported by the University of York Research Visitor Scheme, the DGI grant CONSOLIDERC (CTQ2006-06333), CSIC-PIF RAPCAM (PIF-08-017-3), AGAUR (2009-SGR-00516), and DGI grant POMAs (CTQ2010-19501). CIBER-BBN is an initiative funded by the VI National R&D&i Plan 2008-2011, Iniciativa Ingenio 2010, Consolider Program, CIBER Actions, and financed by the Instituto de Salud Carlos III with assistance from the European Regional Development Fund.-
dc.publisherAmerican Chemical Society-
dc.titleMagnetic interactions in spin-labeled Au nanoparticles-
dc.description.versionPeer Reviewed-
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