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Interaction of the Mu-cyclohexadienyl radical with metallic (Au, Pt) nanoparticles in mesoporous silica

TitleInteraction of the Mu-cyclohexadienyl radical with metallic (Au, Pt) nanoparticles in mesoporous silica
Publication TypeConference Paper
Year of Publication2014
AuthorsXiao, J, Areseneau, DJ, Bridges, MD, Cortie, D, Cottrell, SP, Dehn, M, Fleming, DG, Kelly, J, Kiefl, RF, MacFarlane, WA, MacLachalan, M, McKenzie, I
EditorSalman, Z, Amato, A, Luetkens, H, Morenzoni, E
Conference Name13TH INTERNATIONAL CONFERENCE ON MUON SPIN ROTATION, RELAXATION AND RESONANCE
PublisherPaul Scherrer Inst, Lab Muon Spin Spectroscopy; Univ Zurich; Univ Fribourg; Swiss Natl Fdn; Costruzioni Apparecchiature Elettroniche Nucleari S p A; X TRONIX AG; BlueFors Cryogen Oy Ltd; TECO Rene Koch; Teledyne LeCroy SA
Abstract

mu SR and ALCR techniques have been used to investigate the structure and dynamics of the Mu-cyclohexadienyl radical interacting with Au and Pt metal nanoparticles (MNPs) supported in mesoporous silica (SBA-15). Surprisingly, coherent precession signals are observed and the isotropic hyperfine coupling constants are almost the same in loaded and unloaded samples, implying that the electronic structure of MuC(6)H(6) is only weakly perturbed by the presence of the MNPs. We propose the observed radicals are shielded from the metallic surfaces by a benzene coating on the MNPs. The Delta(1) resonance is observable in MNP-loaded samples at higher temperatures than in the unloaded SBA-15. This is attributed to stronger binding of MuC(6)H(6) to the benzene coated MNPs.
DOI10.1088/1742-6596/551/1/012044