Design, synthesis, catalytic application, and strategic redispersion of plasmonic silver nanoparticles in ionic liquid media
dc.contributor.author | Banerjee, Abhinandan | |
dc.contributor.author | Theron, Robin | |
dc.contributor.author | Scott, Robert WJ | |
dc.date.accessioned | 2018-11-21T17:23:57Z | |
dc.date.available | 2018-11-21T17:23:57Z | |
dc.date.issued | 2014 | |
dc.description.abstract | Silver 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.sponsorship | NSERC | en_US |
dc.description.version | Peer Reviewed | en_US |
dc.identifier.citation | A. Banerjee, R. Theron, R. W. J. Scott, J. Mol. Catal. A, 2014, 393, 105-111. | en_US |
dc.identifier.doi | 10.1016/j.molcata.2014.05.036 | |
dc.identifier.uri | http://hdl.handle.net/10388/11530 | |
dc.publisher | Elsevier | en_US |
dc.subject | Nanoparticles | en_US |
dc.subject | Ionic Liquid | en_US |
dc.subject | Silver | en_US |
dc.subject | Redispersion | en_US |
dc.subject | X-ray absorption spectroscopy | en_US |
dc.title | Design, synthesis, catalytic application, and strategic redispersion of plasmonic silver nanoparticles in ionic liquid media | en_US |
dc.type | Article | en_US |
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