TY - JOUR
T1 - Microsecond charge separation upon photoexcitation of gold nanoparticles in imidazolium ionic liquids
AU - Aprile, Carmela
AU - Herranz, María Ángeles
AU - Carbonell Llopis, Esther
AU - Garcia, Hermenegildo
AU - Martín, Nazario
PY - 2009/1/7
Y1 - 2009/1/7
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85034341941&partnerID=8YFLogxK
U2 - 10.1039/b814384f
DO - 10.1039/b814384f
M3 - Article
AN - SCOPUS:57649121313
SN - 1477-9226
SP - 134
EP - 139
JO - Dalton Transactions
JF - Dalton Transactions
IS - 1
ER -