Microsecond charge separation upon photoexcitation of gold nanoparticles in imidazolium ionic liquids

Carmela Aprile, María Ángeles Herranz, Esther Carbonell Llopis, Hermenegildo Garcia, Nazario Martín

Résultats de recherche: Contribution à un journal/une revueArticleRevue par des pairs

Résumé

Gold nanoparticles (npAu, 5 nm diameter) stabilized by hexanethiol and dodecanethiol do not exhibit in THF upon laser flash excitation (355 nm) any detectable transient in the microsecond timescale. However, using octadecanethiol as npAu ligand, a weak signal attributed to THF solvated electrons was observed after excitation 355 nm. In contrast, irrespective of the alkyl length of the thiol ligand, irradiation of npAu in 1-butyl-3-methylimidazolium ionic liquid allows detecting charge separation in the microsecond time scale. By quenching with methyl viologen (MV) and determining the concentration of MV+˙, it was estimated that the quantum yield of charge separation state in ionic liquid was 0.12.

langue originaleAnglais
Pages (de - à)134-139
Nombre de pages6
journalDalton Transactions
Numéro de publication1
Les DOIs
Etat de la publicationPublié - 7 janv. 2009

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