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Royal Society of Chemistry, Nanoscale, 12(5), p. 5611

DOI: 10.1039/c3nr01119d

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Coexistence of plasmonic and magnetic properties in Au89Fe11 nanoalloys

Journal article published in 2013 by Vincenzo Amendola ORCID, Moreno Meneghetti, Osman M. Bakr, Pietro Riello, Stefano Polizzi, Dalaver H. Anjum, Stefania Fiameni, Paolo Arosio, Tomas Orlando ORCID, Cesar de Julian Fernandez, C. D. Fernandez, Francesco Pineider ORCID, Claudio Sangregorio, Alessandro Lascialfari
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Abstract

We describe an environmentally friendly, top-down approach to the synthesis of Au89Fe11 nanoparticles (NPs). The plasmonic response of the gold moiety and the magnetism of the iron moiety coexist in the Au89Fe11 nanoalloy with strong modification compared to single element NPs, revealing a non linear surface plasmon resonance dependence on the iron fraction and a transition from paramagnetic to a spin glass state at low temperature. These nanoalloys are accessible to conjugation with thiolated molecules and they are promising as contrast agents for magnetic resonance imaging.