T. Nakanishi et al., EFFECT OF IMMOBILIZED ELECTRON RELAY ON THE INTERFACIAL PHOTOINDUCED ELECTRON-TRANSFER AT A LAYERED INORGANIC-ORGANIC COMPOSITE FILM ON GOLD, Journal of electroanalytical chemistry [1992], 455(1-2), 1998, pp. 229-234
A layered composite film of CdS nanoparticles and a 1,6-hexanedithiol
self-assembled monolayer (SAM) fabricated on a gold substrate was modi
fied with 11-ferrocenylundecanethiol (FcC(11)SH), which is expected to
act as an electron relay, by immersion into its hexane solution. X-ra
y photoelectron spectroscopy and electrochemical measurements revealed
that FcC(11)S(H) is mainly located on the gold surface, and partly on
the CdS nanoparticle layer. The FcC(11)SH modification induced a sign
ificant difference in the photoelectrochemical characteristics of the
composite film. The photocurrent increased and decreased at potentials
more positive and negative than the redox potential of the ferrocene
moiety, respectively, leading to a positive shift in the onset potenti
al for the photoinduced anodic current. A change in the transient phot
oresponse was also observed. Efficient electron transfer by the ferroc
ene moiety immobilized between the gold substrate and the CdS nanopart
icle layer accounts reasonably for the behavior mentioned above. (C) 1
998 Elsevier Science S.A. All rights reserved.