Photoinduced Charge Separation in a Fluorophore−Gold Nanoassembly

We report the first spectroscopic demonstration of direct electron transfer between a gold nanoparticle and a surface-bound fluorophore induced by pulsed laser irradiation. Binding of pyrene thiol directly to the gold nanoparticle results in quenching of its singlet excited state. The suppression of...

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Bibliographic Details
Published in:The journal of physical chemistry. B 2002-01, Vol.106 (1), p.18-21
Main Authors: Ipe, Binil Itty, Thomas, K. George, Barazzouk, Said, Hotchandani, Surat, Kamat, Prashant V
Format: Article
Language:English
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Summary:We report the first spectroscopic demonstration of direct electron transfer between a gold nanoparticle and a surface-bound fluorophore induced by pulsed laser irradiation. Binding of pyrene thiol directly to the gold nanoparticle results in quenching of its singlet excited state. The suppression of S1−T1 intersystem crossing process as well as the formation of pyrene radical cation confirm the excited-state interaction between the metal nanoparticle and the surface-bound fluorophore. The charge separation is sustained for several microseconds before undergoing recombination.
ISSN:1520-6106
1520-5207
DOI:10.1021/jp0134695