6533b7d6fe1ef96bd126664b

RESEARCH PRODUCT

Synthesis and characterization of catalytic iridium nanoparticles in imidazolium ionic liquids

Gledison FonsecaGerhard H. FecherMaria Do Carmo Martins AlvesJairton DupontSérgio R. TeixeiraGiovanna MachadoJonder Morais

subject

TetrafluoroborateInorganic chemistryAnalytical chemistrychemistry.chemical_elementNanoparticleSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsIonBiomaterialsMetalchemistry.chemical_compoundColloid and Surface ChemistrychemistryTransition metalHexafluorophosphatevisual_artIonic liquidvisual_art.visual_art_mediumIridium

description

Abstract The reduction of [Ir(cod)Cl]2 (cod = 1,5-cyclooctadiene) dissolved in 1-n-butyl-3-methyl tetrafluoroborate, hexafluorophosphate and trifluoromethane sulphonate ionic liquids in the presence of 1-decene by molecular hydrogen produces Ir(0) nanoparticles. The formation of these nanoparticles follows the two-step [A → B, A + B → 2B ( k 1 , k 2 )] autocatalytic mechanism. The same mean diameter values of around 2–3 nm were estimated from in situ TEM and SAXS analyses of the Ir(0) nanoparticles dispersed in the ionic liquids and by XRD of the isolated material. XPS and EXAFS analyses clearly show the interactions of the ionic liquid with the metal surface demonstrating the formation of an ionic liquid protective layer surrounding the iridium nanoparticles. SAXS analysis indicated the formation of an ionic liquid layer surrounding the metal particles with an extended molecular length of around 2.8–4.0 nm depending on the type of the anion.

yearjournalcountryeditionlanguage
2006-09-01Journal of Colloid and Interface Science
https://doi.org/10.1016/j.jcis.2006.04.073