Real-time electronic monitoring of adsorption kinetics: evidence for two-site adsorption mechanism of dicarboxylic acids on GaAs(100)

Article Abstract:

Dicarboxylic acids chemisorb on the GaAs surface, with binding appreciably stronger for the di- than for the monocarboxylic acids. This was concluded from results of an investigation of the kinetics of adsorption of these acids onto GaAs(100) surface. A two-site mechanism is used to describe the chemisorption of dicarboxylic acids on GaAs (100), unlike the one-site mechanism for benzoic acid adsorption. Absorption kinetics was directly measured using a new electrical method, wherein the current through a GaAs/(Al,Ga)As-based device is measured. Results agree with Fourier transform infrared spectroscopy absorption equilibrium data.

Carboxylic acids

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Photoelectric properties of oriented bacteriorhodopsin/polycation multilayers by electrostatic layer-by-layer assembly

Article Abstract:

Scientific experiments were conducted on the light-driven proton pump bacteriorhodopsin (bR). The photoelectric properties of poly(dimethyldiallylammonium chloride) bR groups (PDAC/bR) under various pH levels and NaN3 concentrations of the electrolytes were examined. A layer-by-layer electrostatic adsorption technique was used. The photocurrent from the samples imply the preservation of the biological activities of the bR after deposition. Moreover, the formation and decay of the M intermediate was identified as the source of light-on and light-off photocurrents.

Polyelectrolytes, Bacteriorhodopsin

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Mechanism of arsine adsorption on the gallium-rich GaAs(001)-(4 x 2) surface

Article Abstract:

Research into the kinetics and mechanism of arsine adsorption on the (4 x 2) surface of gallium arsenide (001) is presented. Arsine decomposes on the GaAs(001)-(4 x 2) surface by first forming a dative bond with the gallium dimers.

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