Glycine on Pt(111): a TDS and XPS study

Löfgren, Patrik; Krozer, Anatol; Lausmaa, Jukka; Kasemo, Bengt Herbert

doi:10.1016/s0039-6028(96)00961-2

Cited by 107 publications

(148 citation statements)

References 30 publications

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“…Above 3 ML, a further, but much slower, linear binding energy increase is observed. The clear break at 3 ML coverage confirms the precision of the glycine coverage calibration made using CO titrations since such binding energy variations as a function of glycine coverage have been found previously on other metal surfaces 17 and will be discussed in more detail below. Figure 4a displays the corresponding spectra of the N 1s region.…”

Section: Glycine Coverage Measurementssupporting

confidence: 84%

“…Similar effects have been noted for glycine adsorption on Pt(111), where, in this case, desorption from second and subsequent layers can be resolved in TPD. 17 Finally, it is consistent with the relatively high temperatures required to sublime solid amino acids (Figure 1 24 ). This indicates that glycine not only adsorbs strongly to the bare Pd(111) surface but also into second and subsequent layers.…”

Section: Glycine Coverage Measurementssupporting

confidence: 74%

“…The lower binding energy feature is assigned to the R-carbon, whereas the high binding energy peak is assigned to the carboxylate group carbon. 17 Figure 3b plots the binding energies of the two C 1s features as a function of glycine coverage. It is found that below 3 ML, both C1s binding energies increase rapidly and linearly with increasing coverage.…”

Section: Glycine Coverage Measurementsmentioning

confidence: 99%

“…Moreover, Lofgren et al 17 have demonstrated that, even at a dosing source temperature of 409 K, glycine dissociation induced contamination is still very limited.…”

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

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: Glycine Coverage Measurementssupporting

confidence: 84%

Section: Glycine Coverage Measurementssupporting

confidence: 74%

Section: Glycine Coverage Measurementsmentioning

confidence: 99%

“…Moreover, Lofgren et al 17 have demonstrated that, even at a dosing source temperature of 409 K, glycine dissociation induced contamination is still very limited.…”

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

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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“…Therfore, the authors concluded that adsorption of Gly-zwitt on silica surfaces activates the formation of amide bonds, contrarily to Gly on Pt(111), 654 graphite 655 and Cu (110). 219 In addition to this set of works, Ben Shir et al 228 also studied the binding of Gly on silica surfaces using multinuclear ssNMR-techniques (Section 3.2.5).…”

Section: Additionally Tpd-ms Experiments (Not Shown Here) Revealed Hmentioning

confidence: 99%

Silica Surface Features and Their Role in the Adsorption of Biomolecules: Computational Modeling and Experiments

et al. 2013

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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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Glycine on Pt(111): a TDS and XPS study

Cited by 107 publications

References 30 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

Silica Surface Features and Their Role in the Adsorption of Biomolecules: Computational Modeling and Experiments

Adsorption and coadsorption of water and glycine on TiO2

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