Adsorption of glycine on hydrophilic gold

Liedberg, Bo; Lundström, Ingemar; Wu, Claudia; Salaneck, W. R.

doi:10.1016/0021-9797(85)90242-5

Cited by 52 publications

(27 citation statements)

References 25 publications

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“…Solid glycine occurs in its zwitterionic form (NH 3 + -CH 2 -COO -). Glycine adsorbed as zwitterions in the monolayer regime has been found previously on Au, 11,12 Ag, 14 Pt, 25 and NiAl, 18 and AuCu alloys. 20 The data shown in Figure 4a indicate that ∼80% of the glycine adsorbs in the zwitterionic form at low coverages, decreasing slightly to ∼70% at higher coverages.…”

Section: Coverage Of Glycine On Pd(111) the Data Ofmentioning

confidence: 79%

“…However, glycine adsorbs exclusively in the zwitterionic form, presumably caused by direct hydrogen transfer between adsorbed glycine molecules. 11,12 In the case of copper substrates 9 at ambient temperatures, the interaction between the surface and glycine is rather strong so that -OH cleavage occurs. However, hydrogen does not remain in the copper surface to allow transfer to the amino group forming exclusively glycinate.…”

Section: Molecular Adsorption Of Glycine the Binding Energies Of C 1mentioning

confidence: 99%

“…Although glycine is itself not chiral, as the simplest amino acid, it is an ideal starting point for understanding more structurally complicated chiral R-amino acids. The adsorption of glycine has been studied on a number of metal single-crystal surfaces including Cu, [4][5][6][7][8][9][10] Au, [11][12][13] Ag, 14,15 Pt, 16,17 and binary metal surfaces, NiAl(110), 18 Ag/Cu(001), and Ag/Cu(111), 19 and Cu/ Au(111). 20 It should be mentioned that the techniques applied in the current report, namely, temperature-programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS), do not allow us to gain detailed understanding of the adsorption geometry of glycine on the surface.…”

Section: Introductionmentioning

confidence: 99%

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Chemistry of Glycine on Pd(111): Temperature-Programmed Desorption and X-ray Photoelectron Spectroscopic Study

Gao

Wang

et al. 2007

J. Phys. Chem. C

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The surface chemistry of glycine is studied on clean Pd(111) using a combination of X-ray photoelectron spectroscopy (XPS) and temperature-programmed desorption (TPD). Glycine adsorbs strongly into second and subsequent layers as well as on the first monolayer, where the first-layer coverage is measured by titrating the bare surface with carbon monoxide. A small portion of glycine adsorbed directly on the Pd(111) surface desorbs as intact molecules, whereas the majority thermally decomposes by C-C bond scission. The COO moiety desorbs as CO and CO 2 , whereas the nitrogen-containing fragment yields methylamine and HCN. XPS reveals that glycine adsorbs predominantly in its zwitterionic form on the clean surface, whereas the multilayer contains 70-80% zwitterionic glycine, the remainder adsorbing in the neutral form.

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Section: Coverage Of Glycine On Pd(111) the Data Ofmentioning

confidence: 79%

Section: Molecular Adsorption Of Glycine the Binding Energies Of C 1mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Chemistry of Glycine on Pd(111): Temperature-Programmed Desorption and X-ray Photoelectron Spectroscopic Study

Gao

Wang

et al. 2007

J. Phys. Chem. C

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“…[19][20][21][22][23][24][25][26][27][28][29] A few studies have used adsorption layers formed in situ [30][31][32][33][34][35][36][37][38][39][40][41] but never with water as a coadsorbate. No information, to our knowledge, has been reported on the energetics or kinetics of glycine adsorption on TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Adsorption and coadsorption of water and glycine on TiO2

Lausmaa

Löfgren

Kasemo

1999

J. Biomed. Mater. Res.

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Adsorption of water, ions, and biomolecules constitutes the first events occurring at biomaterial-biosystem interfaces. In this work, the adsorption and coadsorption of water and glycine on TiO2 were studied by thermal desorption spectroscopy (TDS). The first water monolayer desorbs in three peaks around 180K, 300K, and 400K, which are assigned to water molecularly adsorbed at oxygen sites, at Ti4+ sites, and to recombination of dissociated water, respectively. A fourth desorption peak (160K), appearing at coverages > 0.8 monolayer, is attributed to water clusters and multilayers. The water-TiO2 interaction is changed if the surface is annealed in vacuum, which leads to increased hydroxylation. Desorption spectra from glycine overlayers evaporated on TiO2 in situ show that around 40% of the first monolayer desorbs as intact molecules ( approximately 300-450 K) and the remainder as dissociation fragments and surface reaction products around 600 K. At coverages > 0.6 monolayers, intact molecules desorbing from cluster multilayers at 310 K are detected. The glycine desorption spectra are unaffected by coadsorbed water. In contrast, coadsorption of glycine displaces water from more strongly bound states in the monolayer to more weakly bound states and clusters, making the surface more hydrophobic. The study shows that TDS is a powerful method for characterizing biomaterial surfaces with regard to their interaction with biologically relevant molecules.

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“…The development of thin films that provide selective partitioning regions for chemical and biochemical sensors and for chromatographic purposes has led to a significant amount of work into adsorption, chemisorption, and covalent deposition of small molecules, proteins, polymers, and inorganic layers onto solid surfaces (1)(2)(3)(4)(5)(6). The organization of organic molecules into monolayer films through self-assembly provides a facile method of preparing surfaces with a well-defined composition, structure, and thickness, and permits the control of chemical and physical properties of the surface.…”

Section: Introductionmentioning

confidence: 99%

Self-assembly of short and long-chain n-alkyl thiols onto gold surfaces: A real-time study using surface plasmon resonance techniques

Debono¹,

Loucks²,

Manna³

et al. 1996

Can. J. Chem.

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Abstract:Gold surfaces coated with monolayers of alkyl thiols are significant in the field of biosensors and chromatography. There is a general concern about the quality of coatings in terms of surface density and voids. The self-assembly of the shortchain hexane (C6) thiol and long-chain dodecane (C12) and hexadecane (CI6) thiols to polycrystalline gold surfaces has been investigated in situ and in real time using surface plasmon resonance (SPR) spectroscopy and surface plasmon microscopy (SPM). The self-assembly was followed based on observed changes in reflectivity at a fixed angle of incidence as a function of time. Our results indicate that the data for hexane, dodecane, and hexadecane thiol adsorption to gold surfaces were best fit by a two-step process rather than a one-step process. The mechanism may involve fast adsorption to the surface to give 80% (CI2, CI6) or 50% (C6) coverage followed by a slow ( 100-fold slower) "rearrangement" of the adsorbed thiol. SPM shows these surfaces to be smooth and homogenous at a 4 p m scale. An understanding of the process of rearrangement could lead to control of the quality of coatings for analytical applications.Key words: surface plasmon, alkyl thiols, gold, monolayer, kinetics, ellipsometry, microscopy.RCsumC : Les surfaces d'or enduites de monocouches d'alkylthiols prksentent de I'intkrkt dans le domaine des biosenseurs et de la chromatographie. I1 existe une crainte gtnkraliske au sujet de la qualitt des enduits en termes de densitt et de manques a la surface. Faisant appel h la spectroscopie de rtsonance des plasmons de surface (RPS) et de la microscopie des plasmons de surface (MPS), on a ttudit in situ et en temps reel l'autoassemblage de chaines courtes (hexane, C6) et longues (dodtcane, C,,, et hexadtcane, CI6) de thiols a des surfaces d'or. On a suivi I'autoassemblage en se basant sur les changements observts dans la rtflectivitt, h un angle d'incidence fixe, en fonction du temps. Nos rtsultats indiquent que le meilleur ajustement des donntes pour les hexane-, dodtcane-et hexadkcane-thiols correspond a un processus en deux Ctapes plutBt qu'un processus en une ttape.11 est possible que le mecanisme implique une adsorption rapide 2 la surface, conduisant B une couverture de 80% (C,, ou CI6) ou de 50% (C6), qui serait suivie par un <~rCarrangementn lent (au moins 100 fois plus lent) du thiol adsorbt. La MPS montre que, B une tchelle de 4 pm, ces surfaces sont lisses et homogknes. Une comprthension du processus de rtarrangement pourrait conduire a une possibilitt de contrBle de la qualitt des enduits pour des applications analytiques.

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Adsorption of glycine on hydrophilic gold

Cited by 52 publications

References 25 publications

Chemistry of Glycine on Pd(111): Temperature-Programmed Desorption and X-ray Photoelectron Spectroscopic Study

Chemistry of Glycine on Pd(111): Temperature-Programmed Desorption and X-ray Photoelectron Spectroscopic Study

Adsorption and coadsorption of water and glycine on TiO2

Self-assembly of short and long-chain n-alkyl thiols onto gold surfaces: A real-time study using surface plasmon resonance techniques

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