INVESTIGADORES
FUNGO Fernando Gabriel
artículos
Título:
Electrochemistry and Photoelectrochemistry of a Pigment Used in Artificial Photosynthesis: an Anilinocarotenoid.
Autor/es:
F. FUNGO, L. OTERO, E. N. DURANTINI J. J. SILBER, L. SERENO, E. MARIÑO-OCHOA, A. MOORE, T. MOORE AND D. GUST.
Revista:
JOURNAL OF PHYSICAL CHEMISTRY B
Editorial:
acs
Referencias:
Año: 2001 vol. 105 p. 4783 - 4790
ISSN:
1089-5647
Resumen:
LB films of an amphipathic carotenoid, 7¢-apo-7¢-(4-aminophenyl)-â-carotene (H2APC), deposited on
semiconducting transparent ITO electrodes, when immersed in electrolyte-containing benzoquinone (Q) and
illuminated, produced photocurrents that were measured over the spectral range of 350-700 nm. The generated
photocurrent was investigated as a function of different variables: bias potential, number of LB layers, and
concentration of Q in the surrounding electrolyte. Only cathodic photocurrents were observed with H2APC.
The action spectrum shows that the absorption of light by the carotenoid pigment is responsible for the
photocurrent effects. The photoresponse increases linearly with the number of LB layers deposited. The quantum
yield of electron transfer is independent of the number of layers, indicating efficient charge and/or energy
transfer between the layers. This result is unique to carotenoids films. Anodic photocurrents were not detected
even in the presence of electron-donor couples. This behavior is in contrast to that observed with another
amphipathic carotenoid, 7¢-apo-7¢(4-carboxyphenyl)-â-carotene (ACC), which generates photocurrents in either
direction depending on the external couple.