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Design, synthesis, catalytic application, and strategic redispersion of plasmonic silver nanoparticles in ionic liquid media

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dc.contributor.authorBanerjee, Abhinandan
dc.contributor.authorTheron, Robin
dc.contributor.authorScott, Robert WJ
dc.date.accessioned2018-11-21T17:23:57Z
dc.date.available2018-11-21T17:23:57Z
dc.date.issued2014
dc.description.abstractSilver nanoparticles synthesized in tetraalkylphosphonium ionic liquids are found to be excellent catalysts for borohydride-induced reductive degeneration of Eosin-Y, a dye that has been classified as a Class 3 carcinogen by the International Agency for Research on Cancer. TEM images indicated that the size of the Ag nanoparticles was significantly influenced by heat-induced sintering. A strategy was devised to redisperse smaller Ag nanoparticles from their aggregated/sintered counterparts via a two-step protocol that involved oxidative etching of Ag nanoparticles, followed by a re-reduction step. This protocol led to a reduction in the sintered Ag nanoparticle size from 15.7 ± 6.1 nm to 3.7 ± 0.8 nm, which was consistent with the size of the as-synthesized nanoparticles. The as-synthesized and the redispersed Ag nanoparticles were found to catalyze the bleaching of Eosin-Y with comparable efficiencies; first order rate constants for Eosin Y reduction were ∼8 times higher for smaller Ag nanoparticles compared to their sintered counterparts. An examination of the kinetics of Ag nanoparticle etching was performed via temperature-controlled UV–vis spectroscopy. Changes in the oxidation state of Ag during this sequence of events were also followed by in situ X-ray absorption spectroscopy of Ag nanoparticles in the ionic liquid.en_US
dc.description.sponsorshipNSERCen_US
dc.description.versionPeer Revieweden_US
dc.identifier.citationA. Banerjee, R. Theron, R. W. J. Scott, J. Mol. Catal. A, 2014, 393, 105-111.en_US
dc.identifier.doi10.1016/j.molcata.2014.05.036
dc.identifier.urihttp://hdl.handle.net/10388/11530
dc.publisherElsevieren_US
dc.subjectNanoparticlesen_US
dc.subjectIonic Liquiden_US
dc.subjectSilveren_US
dc.subjectRedispersionen_US
dc.subjectX-ray absorption spectroscopyen_US
dc.titleDesign, synthesis, catalytic application, and strategic redispersion of plasmonic silver nanoparticles in ionic liquid mediaen_US
dc.typeArticleen_US

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