High resolution NEXAFS studies of aromatic molecules adsorbed and condensed on Ni(111)

Aminpirooz, S.; Becker, L.; Hillert, B.; Haase, J.

doi:10.1016/0039-6028(91)90489-f

Cited by 36 publications

(37 citation statements)

References 12 publications

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“…The N K-edge NEXAFS spectra of the PPPT films are quite similar to those of pyridine [53,54,57,58] and pyrazine. [54,55] One such spectrum (55°) for PPPT/Au is presented in Figure 4.…”

Section: Full Papermentioning

confidence: 49%

“…[50] The C K-edge NEXAFS spectra of PPPT/Au acquired at X-ray incidence angles of 20°, 55°, and 90°, as well as the respective difference spectrum (i.e., the difference between the spectra acquired at 90°and 20°), are presented in Figure 3. Assignments and energy positions of the absorption resonances are given in Table 1, along with analogous data for benzene, [50][51][52][53] pyridine, [53,54] pyrazine, [54,55] and TPT/Au; [30] benzene is considered as a general reference for aromatic compounds, whereas the pyridine and pyrazine data serve as references for the structural components of PPPT. Note that the shape of the C K-edge NEXAFS spectrum for both pyridine and pyrazine is very similar to benzene.…”

Section: Xps and Nexafs Characterizationmentioning

confidence: 99%

“…[54,55] One such spectrum (55°) for PPPT/Au is presented in Figure 4. The assignments and energy positions of the absorption resonances are given in Table 2, along with the analogous data for pyridine and pyrazine presented for comparison.…”

Section: Full Papermentioning

confidence: 99%

“…[59,60] A herringbone packing of the PPPT backbones with Table 1. Photon energy positions (eV) and assignments (only the final orbital) of the C K-edge NEXAFS resonances for PPPT SAMs on Au and Ag along with reference data for benzene, [50][51][52][53] pyridine, [53,54[ pyrazine, [54,55] and TPT/Au. [30] p 1a * R * /C-S * [a] The p * (e 2u ) resonance is split into two peaks in pyridine and pyrazine.…”

Section: Full Papermentioning

confidence: 99%

“…Table 2. Photon energy positions (eV) and assignments (only the final orbital) of the N K-edge NEXAFS resonances for the PPPT SAMs on Au and Ag along with the reference data for pyridine [53,54] and pyrazine. [54,55] …”

Section: Full Papermentioning

confidence: 99%

See 4 more Smart Citations

Charge Transport through Oligoarylene Self‐assembled Monolayers: Interplay of Molecular Organization, Metal–Molecule Interactions, and Electronic Structure

Grave¹,

Risko²,

Shaporenko

et al. 2007

Adv Funct Materials

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The electrical properties of two molecular wires?a novel aryl moiety, 6‐(5‐pyridin‐2‐ylpyrazin‐2‐yl)pyridine‐3‐thiol (PPPT), and the well studied 1,1';4',1''‐terphenyl‐4‐thiol (TPT)?organized in self‐assembled monolayers (SAMs) are measured using metal–molecule–metal (MMM) mercury‐drop junctions. Current measured at the same bias voltage through PPPT is found to be more than one order of magnitude lower than through TPT. To interpret and understand these results, characterization of the structure, organization of the SAMs, and theoretical analyses of the molecular systems are discussed. X‐ray photoelectron spectroscopy (XPS) and near‐edge X‐ray absorption fine structure spectroscopy (NEXAFS) indicate that although PPPT forms high‐quality SAMs on both Au and Ag substrates, it exhibits a lower packing density (by 20 %) and less orientational order than TPT. In addition, electronic structure calculations with density functional theory (DFT) reveal that the electron‐withdrawing nitrogen atoms in the PPPT aryl backbone stabilize the valence molecular electronic structure and pull negative charge from the thiol sulfur. This behavior can influence both charge‐injection barriers and metal–molecule binding interactions in the MMM junctions. The current–voltage data are interpreted on the basis of a hole‐tunneling, through‐bond mechanism. Conductance analysis through a model for off‐resonant tunneling transport suggests that a comparatively small difference in the charge‐injection barrier can explain the factor of ten difference in observed conduction.

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“…The N K-edge NEXAFS spectra of the PPPT films are quite similar to those of pyridine [53,54,57,58] and pyrazine. [54,55] One such spectrum (55°) for PPPT/Au is presented in Figure 4.…”

Section: Full Papermentioning

confidence: 49%

Section: Xps and Nexafs Characterizationmentioning

confidence: 99%

Section: Full Papermentioning

confidence: 99%

Section: Full Papermentioning

confidence: 99%

Section: Full Papermentioning

confidence: 99%

See 3 more Smart Citations

Charge Transport through Oligoarylene Self‐assembled Monolayers: Interplay of Molecular Organization, Metal–Molecule Interactions, and Electronic Structure

Grave¹,

Risko²,

Shaporenko

et al. 2007

Adv Funct Materials

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SEXAFS und NEXAFS. Röntgen‐Absorptionsspektroskopie an Adsorbat‐bedeckten Oberflächen

Haase¹

1992

Chemie in nserer Zeit

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Die Röntgen‐Absorptionsspektroskopie an Oberflächen ist eine Methode zur Bestimmung der lokalen Geometrie adsorbierter Atome und Moleküle und damit eine Methode der „Oberflächen‐Kristallographie”︁. Sie wurde erst durch den Bau leistungsfähiger Synchrotron‐Strahlungsquellen möglich, die ein intensives und über einen weiten Wellenlängenbereich kontinuierliches Strahlungs‐Spektrum liefern [1]. Zuvor wurde die Struktur von Adsorbat‐bedeckten Oberflächen hauptsächlich mit Hilfe der Beugung langsamer Elektronen (Low‐Energy Electron Diffraction, LEED) bestimmt. Die klassische Methode der Kristallstrukturanalyse, die Röntgenbeugung, die bei der Erforschung der atomaren Struktur der Materie so erfolgreich ist, hat für Oberflächenuntersuchungen nur begrenzten Wert.

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Orientation and Electronic Structure of Ion-Exchanged Pyridinium Compounds on Mica

Zwahlen

Brovelli

Caseri

et al. 2002

Journal of Colloid and Interface Science

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High resolution NEXAFS studies of aromatic molecules adsorbed and condensed on Ni(111)

Cited by 36 publications

References 12 publications

Charge Transport through Oligoarylene Self‐assembled Monolayers: Interplay of Molecular Organization, Metal–Molecule Interactions, and Electronic Structure

Charge Transport through Oligoarylene Self‐assembled Monolayers: Interplay of Molecular Organization, Metal–Molecule Interactions, and Electronic Structure

SEXAFS und NEXAFS. Röntgen‐Absorptionsspektroskopie an Adsorbat‐bedeckten Oberflächen

Orientation and Electronic Structure of Ion-Exchanged Pyridinium Compounds on Mica

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