Publication

Porphyrin ‘‘Mille-Feuilles” photo-electrodes

Hubert Girault, Bin Su, Mohamad Hojeij
2008
Journal Articles

Abstract

A porphyrin ‘‘Mille-Feuilles” photo-electrode is fabricated layer-by-layer by deposition of anionic [zinc meso-tetrakis(p-sulfonato phenyl) porphyrin]4- (ZnTPPS4−) and positively charged polypeptides on a 11-mercaptoundecanoic acid-modified gold electrode to form a photoactive film. This work demonstrates that it is possible to form 3D structures having regularly spaced layers of redox molecules. UV–visible spectra of the multilayer films display the characteristic absorption bands of the porphyrins and the absorbance increases linearly with the number of bilayers. The cyclic voltammetric response of the films in contact with 1,2-dichloroethane (DCE) varies from that of a modified electrode to that of a supported liquid film. Under illumination, a large photocurrent response for oxygen reduction with a maximum for a 5-bilayer film is observed.

Official source

https://infoscience.epfl.ch/entities/publication/bd2436bd-3e10-43a3-ba81-b2af26db9ed2

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Hubert Girault, Bin Su, Mohamad Hojeij
2008
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/bd2436bd-3e10-43a3-ba81-b2af26db9ed2

About this result

Related concepts (28)

Ultraviolet–visible spectroscopy

UV spectroscopy or UV–visible spectrophotometry (UV–Vis or UV/Vis) refers to absorption spectroscopy or reflectance spectroscopy in part of the ultraviolet and the full, adjacent visible regions of the electromagnetic spectrum. Being relatively inexpensive and easily implemented, this methodology is widely used in diverse applied and fundamental applications. The only requirement is that the sample absorb in the UV-Vis region, i.e. be a chromophore. Absorption spectroscopy is complementary to fluorescence spectroscopy.

Absorption spectroscopy

Absorption spectroscopy refers to spectroscopic techniques that measure the absorption of electromagnetic radiation, as a function of frequency or wavelength, due to its interaction with a sample. The sample absorbs energy, i.e., photons, from the radiating field. The intensity of the absorption varies as a function of frequency, and this variation is the absorption spectrum. Absorption spectroscopy is performed across the electromagnetic spectrum.

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Absorbance is defined as "the logarithm of the ratio of incident to transmitted radiant power through a sample (excluding the effects on cell walls)". Alternatively, for samples which scatter light, absorbance may be defined as "the negative logarithm of one minus absorptance, as measured on a uniform sample". The term is used in many technical areas to quantify the results of an experimental measurement. While the term has its origin in quantifying the absorption of light, it is often entangled with quantification of light which is “lost” to a detector system through other mechanisms.

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