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Article Dans Une Revue Langmuir Année : 2006

Adsorption of L-Lysine on Cu(110): A RAIRS study from UHV to the liquid phase

Résumé

Adsorption of L-Lysine on a Cu(110) surface has been investigated under UHV condition from sublimation of a crystalline phase. The adsorption was characterised by Fourier Transform Reflection Absorption Infrared Spectroscopy (FT-RAIRS) during exposure and Auger Electron Spectroscopy (AES). At room temperature, the Lysine molecules adsorption geometry varies as a function of the exposure. At low coverage, the molecules are adsorbed via the oxygen atoms of the deprotonated carboxylate group and the nitrogen atom of the amino group. At high coverage, close to the monolayer, the molecules reorient to be anchored to the surface via one oxygen of a side way tilted carboxylate moiety. This first step is followed by the growth of multilayers of non oriented molecules. In contrast, adsorption on an oxygen-modified copper surface leads to a rather disordered layer. The results are compared with the adsorption carried out on a polycrystalline copper surface after immersion in solutions of lysine at various pH. The adsorption was monitored by polarisation modulation infrared spectroscopy (PM-IRRAS). The chemistry of the adsorbed molecules is function of the starting chemical form of the lysine molecules imposed by the pH of the solution. The combination of the two techniques and various sets of adsorption conditions will give important insight information regarding the adsorption of biomolecules on metal surfaces, the influence of water, or of surface oxygen.

Domaines

Matériaux

Dates et versions

hal-00022056 , version 1 (31-03-2006)

Identifiants

Citer

Vincent Humblot, Christophe Méthivier, Claire-Marie Pradier. Adsorption of L-Lysine on Cu(110): A RAIRS study from UHV to the liquid phase. Langmuir, 2006, 22, pp.3089-3096. ⟨10.1021/La0533866⟩. ⟨hal-00022056⟩
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