Photoelectrochemical analysis of size-dependent electronic structures of gold clusters supported on TiO2

Size-dependent electronic structures around the Fermi level of glutathione-protected gold clusters (0.9-1.4 nm in core diameter) were analyzed on the basis of photoinduced charge separation at the interface between the gold cluster and TiO 2 . Electron levels such as HOMO and LUMO were estimated fro...

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Bibliographic Details
Published in:Nanoscale 2012-07, Vol.4 (14), p.4217-4221
Main Authors: Kogo, Atsushi, Sakai, Nobuyuki, Tatsuma, Tetsu
Format: Article
Language:English
Subjects:
Electrodes
Electrons
Gold - chemistry
Iodides - chemistry
Metal Nanoparticles - chemistry
Photochemical Processes
Quantum Theory
Titanium - chemistry
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Summary:Size-dependent electronic structures around the Fermi level of glutathione-protected gold clusters (0.9-1.4 nm in core diameter) were analyzed on the basis of photoinduced charge separation at the interface between the gold cluster and TiO 2 . Electron levels such as HOMO and LUMO were estimated from the dependencies of the photocurrents on the irradiation wavelength and the standard electrode potentials of electron donors employed. The potential of the occupied levels involved in the charge separation under visible or near infrared light shifts negatively as the cluster size increases. Electronic levels around the Fermi level of gold clusters with different sizes were estimated from photocurrents of TiO 2 electrodes modified with the clusters in the presence of various electron donors.
ISSN:2040-3364
2040-3372
DOI:10.1039/c2nr30480e