TY - JOUR
T1 - Transition from nanoparticle to molecular behavior
T2 - A femtosecond transient absorption study of a size-selected 28 atom gold cluster
AU - Link, Stephan
AU - El-Sayed, Mostafa A.
AU - Schaaff, T. Gregory
AU - Whetten, Robert L.
N1 - Funding Information:
This work was supported by the Office of Naval Research (ONR grant no. CHE-9727633). S.L. acknowledges the partial support of the Molecular Design Institute at Georgia Tech, under prime contract N00014-95-1-1116 from the Office of Naval Research.
PY - 2002/4/22
Y1 - 2002/4/22
N2 - The ultrafast electron dynamics of chemically prepared gold nanoclusters with a 28 atom gold core surrounded by 16 glutathione molecules were investigated. After excitation with femtosecond laser pulses these clusters show an induced transient absorption in the visible from 2.58 to 1.65 eV (480-750 nm) with a maximum around 2.07 eV (600 nm). The excited state relaxation shows a biexponential decay with a subpicosecond and a longer nanosecond decay time independent of the laser pump power. These results are different from those observed previously for larger gold nanoparticles, which suggests that the Au28-glutathione system shows molecular properties.
AB - The ultrafast electron dynamics of chemically prepared gold nanoclusters with a 28 atom gold core surrounded by 16 glutathione molecules were investigated. After excitation with femtosecond laser pulses these clusters show an induced transient absorption in the visible from 2.58 to 1.65 eV (480-750 nm) with a maximum around 2.07 eV (600 nm). The excited state relaxation shows a biexponential decay with a subpicosecond and a longer nanosecond decay time independent of the laser pump power. These results are different from those observed previously for larger gold nanoparticles, which suggests that the Au28-glutathione system shows molecular properties.
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U2 - 10.1016/S0009-2614(02)00306-8
DO - 10.1016/S0009-2614(02)00306-8
M3 - Article
AN - SCOPUS:0037156171
SN - 0009-2614
VL - 356
SP - 240
EP - 246
JO - Chemical Physics Letters
JF - Chemical Physics Letters
IS - 3-4
ER -