Magnetic gold confined in ordered mesoporous titania thin films: a noble approach for magnetic devices

Abstract

Sem informaçãoIn the, past decade, the surprising, magnetic behavior of gold nanoparticles has been reported. This unexpected-property is mainly attributed both to size and surface effects. Mesoporous thin films are ideal matrices for metallic nanoparticles inclusion, because of their highly accessible and tailorable pore systems that lead to completely tunable chemical environments. Exploiting these features, we synthesized Au nanoparticles within mesoporous titania thin films (film thickness of similar to 150 nm and pore diameter of similar to 5nm), and we studied their magnetic properties under confinement. Here, we present the results of the magnetization as a function of temperature and magnetic field for this system, which ate consistent with the previously reported for free (unconfined) thiol-capped gold nanoparticles. The successful inclusion of stable magnetic Au nanoparticles within transparent mesoporous thin films opens the gates for the application of these nanocomposites in two-dimensional (2D) microdevices technology and magneto-optical devices.In the, past decade, the surprising, magnetic behavior of gold nanoparticles has been reported. This unexpected-property is mainly attributed both to size and surface effects. Mesoporous thin films are ideal matrices for metallic nanoparticles inclusion, because of their highly accessible and tailorable pore systems that lead to completely tunable chemical environments. Exploiting these features, we synthesized Au nanoparticles within mesoporous titania thin films (film thickness of similar to 150 nm and pore diameter of similar to 5nm), and we studied their magnetic properties under confinement. Here, we present the results of the magnetization as a function of temperature and magnetic field for this system, which ate consistent with the previously reported for free (unconfined) thiol-capped gold nanoparticles. The successful inclusion of stable magnetic Au nanoparticles within transparent mesoporous thin films opens the gates for the application of these nanocomposites in two-dimensional (2D) microdevices technology and magneto-optical devices.91965971Sem informaçãoSem informaçãoSem informaçãoThis work was funded by CONICET (No. PIP 112-200801-00038), ANPCyT (Nos. PICT 2087 and 2015-3526), and ECOS CONICET-CNRS (No. A08E05). L.P.G., G.J.A.A.S.I., and H. T are CONICET staff members. We thank Solange Di Napoli and Andrea Barral for fruitful discussions. Magnetometry measurements were performed in a SQUID belonging to the National Magnetism System (MINCYT)