Abstract
The structures and stability levels of leucine (Leu) and tyrosine (Tyr) adsorbed on a Cu(110) surface, at initial levels of coverage (less than 0.25 monolayer), were investigated using reflection–absorption infrared spectroscopy and high-resolution photoemission spectroscopy (HRPES), as well as by performing density functional theory calculations. At an initial coverage, the O–H dissociation bonded structure was indicated from the spectral results to be the most favorable structure for Leu adsorbed on the Cu(110) surface, whereas the O–H dissociated-N dative bonded structure was most favorable for adsorbed Tyr. These models were further supported by the results of experiments, in which the systems were exposed to other molecules and HRPES was used to monitor whether the amine or carboxylic groups of the adsorbed amino acids became reactive.
Highlights
In the field of surface science, research on the interactions between biomolecules, including their various functional groups (-NH2, -COOH, -OH, and -SH), and substrates is focused on determining which structure is the most stable adsorption structure during initial coverage because these structures are important for practical applications, such as biosensors and bio-selective chips [1,2,3,4,5,6,7]
Dative bonded structure and O–H dissociation bonded structure are generally the stable adsorption features for amino acids on a Ge(100)
If all the bands in an RAIR spectrum can be analyzed to the functional groups of the molecule, one can conclude that the molecule is adsorbed intact
Summary
In the field of surface science, research on the interactions between biomolecules, including their various functional groups (-NH2 , -COOH, -OH, and -SH), and substrates is focused on determining which structure is the most stable adsorption structure during initial coverage because these structures are important for practical applications, such as biosensors and bio-selective chips [1,2,3,4,5,6,7]. As the carboxylate group has two equivalent oxygen atoms, they adsorb on the Cu(110) surface in two equivalent manners. For this specific purpose, a comparative investigation of the adsorption of
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