Transition from nanoparticle to molecular behavior: A femtosecond transient absorption study of a size-selected 28 atom gold cluster

Stephan Link; Mostafa A. El-Sayed; T. Gregory Schaaff; Robert L. Whetten

doi:10.1016/S0009-2614(02)00306-8

Transition from nanoparticle to molecular behavior: A femtosecond transient absorption study of a size-selected 28 atom gold cluster

Stephan Link, Mostafa A. El-Sayed, T. Gregory Schaaff, Robert L. Whetten

Research output: Contribution to journal › Article › peer-review

120 Scopus citations

Abstract

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.

Original language	English (US)
Pages (from-to)	240-246
Number of pages	7
Journal	Chemical Physics Letters
Volume	356
Issue number	3-4
DOIs	https://doi.org/10.1016/S0009-2614(02)00306-8
State	Published - Apr 22 2002
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy
Physical and Theoretical Chemistry

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10.1016/S0009-2614(02)00306-8

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title = "Transition from nanoparticle to molecular behavior: A femtosecond transient absorption study of a size-selected 28 atom gold cluster",

abstract = "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.",

author = "Stephan Link and El-Sayed, {Mostafa A.} and Schaaff, {T. Gregory} and Whetten, {Robert L.}",

note = "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.",

year = "2002",

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doi = "10.1016/S0009-2614(02)00306-8",

language = "English (US)",

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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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JO - Chemical Physics Letters

JF - Chemical Physics Letters

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Transition from nanoparticle to molecular behavior: A femtosecond transient absorption study of a size-selected 28 atom gold cluster

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