Surface vibrational and structural properties of polymers by HREELS

Pireaux, Jean‐Jacques; Grégoire, Chantal; Vermeersch, M.; Thiry, P.A.; Caudano, R.

doi:10.1016/s0039-6028(87)80527-7

Cited by 41 publications

(8 citation statements)

References 20 publications

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“…For the PVD films, count rates in the elastic peak were typically in the range of 1.5 · 10 3 to 1.5 · 10 3 cps, and the spectral resolution was between 50 and 70 cm À1 FWHM (full-width at half maximum). Although the intensity and spectral resolutions are significantly degraded as compared to those on single crystal surfaces, the HREELS results from the PVD WC films are adequate to determine the reaction pathways of cyclohexene [18][19][20][21][22][23]. For TPD and HREELS experiments the WC film was heated with a linear heating rate of 1.5 K/s.…”

Section: Techniquesmentioning

confidence: 99%

Synthesis, characterization and surface reactivity of tungsten carbide (WC) PVD films

Zellner

Chen

2004

Surface Science

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Section: Techniquesmentioning

confidence: 99%

Synthesis, characterization and surface reactivity of tungsten carbide (WC) PVD films

Zellner

Chen

2004

Surface Science

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“…The intensity variations of the relative areas G along water exposure allow monitoring both the underlying SAM and the water layer under formation. Keeping in mind that quantitative studies based on feature integrated areas in HREELS are known to be challenging, 45 HREEL spectra after deposition of each water layer have been recorded with the same settings of the spectrometer. The relative area G n(CH 2 ) of the n(CH 2 ) MUA peak is obtained by integration between 345 and 390 meV, and normalization by the pristine SAM, representing a bare surface (100% of free surface, only the SAM contribution in the probed depth).…”

Section: View Article Onlinementioning

confidence: 99%

“…Consequently, above y \ 2.8 L water layers, the substrate is no more visible. The question of the HREELS probed depth in organic materials, as our MUA SAM, is still open 45. The extinction of the loss at 362 meV, attributed to the methylene stretching modes n(CH 2 ) MUA , determines the limit above which the MUA SAM is no longer probed.…”

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confidence: 99%

Interfacial water on organic substrates at cryogenic temperatures: hydrogen bonding and quantification in the submonolayer regime

Houdoux

Houplin

Amiaud

et al. 2017

Phys. Chem. Chem. Phys.

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Water molecules were used to probe the physical and chemical properties of a model hydrophilic organic organized layer. To this end, HO adsorption on mercaptoundecanoic acid self-assembled monolayers (SAMs) was investigated at the molecular level under ultra-high vacuum by high resolution electron energy loss spectroscopy (HREELS), through the sensitivity of the water OH stretching modes to the molecular environment. The water interfacial layer formation and structure were studied upon deposition at 28 K. A direct sensitive quantification in the submonolayer regime (10-80% of completion) was achieved by the sole measurement of the OH stretching mode frequencies, and the dominant basic (-COO)/acidic (-COOH) forms of the terminal functions could be probed. The surface densities of the water interfacial layer and the SAM terminal functions were measured independently, and demonstrated to be comparable. This means that the SAM terminal functions provided anchors for water adsorption through two hydrogen bonds and that the SAM acted as a template even at 28 K. Upon annealing at 110 K, the water molecules were observed to form clusters of higher molecular density, dewetting the supporting substrate. Finally, the vanishing of the supporting substrate vibrational signature, due to the masking effect by the deposited water layer, was used to estimate the depth probed by HREELS through water layers to be 11 ± 2 Å.

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“…HREELS. In a HREELS experiment (Figure 1), a low-energy, monochromatic electron beam (typically, [1][2][3][4][5][6][7][8][9][10] eV with an energy defined to ~5 meV) is focused onto the sample surface. There the beam is backscattered into an electron energy analyzer whose function is to separate the electrons that suffered inelastic collisions in the target.…”

Section: Instrumentationmentioning

confidence: 99%

Analysis of polymer surfaces using electron and ion beams

Gardella¹,

Pireaux²

1990

Anal. Chem.

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When materials science emerged as one of the important research areas in the 1980s, chemists were encouraged to become more involved in interdisciplinary and multidisciplinary efforts in the field (1). Today, interest continues unabated and chemists are making contributions in areas ranging from material synthesis and characterization to the details of development and device engineering. One emphasis in materials science involves surface and interfacial concerns, and this is an area in which advances in basic science rapidly transfer to technology (2).Materials scientists and engineers are now focusing more attention on polymers because of their increasing usefulness in the marketplace. Polymers are an inexpensive alternative for traditional structural materials: in fact, the volume of polymers produced worldwide has surpassed that of steel.

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Surface vibrational and structural properties of polymers by HREELS

Cited by 41 publications

References 20 publications

Synthesis, characterization and surface reactivity of tungsten carbide (WC) PVD films

Synthesis, characterization and surface reactivity of tungsten carbide (WC) PVD films

Interfacial water on organic substrates at cryogenic temperatures: hydrogen bonding and quantification in the submonolayer regime

Analysis of polymer surfaces using electron and ion beams

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