Surface-enhanced Raman spectroscopy of the effect of electrode potential on the adsorption configuration of L-methionine molecules: The electrochemical in situ surface-enhanced Raman spectroscopy technique was used to study the characteristics of the structure of the self-assembled monolayer of L-methionine adsorbed on the roughened gold and silver electrode surfaces as the potential changes. The experimental results show that: in the range of applied potential 0 to -0.6 V, L-methionine mainly interacts with the silver electrode surface through two adsorption sites, the sulfur atom and the deprotonated carboxyl group; while on the gold electrode surface, the three adsorption sites, the amino group, the deprotonated carboxyl group and the sulfur atom in the molecule, change with the negative potential shift; in addition, for the L-methionine monolayer adsorbed on the gold electrode surface, it is also accompanied by the change of the molecular configuration caused by the intramolecular rotation of the adsorbate molecules. Keywords: L-methionine; self-assembled monolayer; surface-enhanced Raman spectroscopy; electrode potential
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