Measurement of the surface coverage of V/Al2O3 catalysts by infrared spectroscopy, CO2 chemisorption and ion scattering spectroscopy

Eberhardt, Mary A.; Houalla, Marwan; Hercules, David M.

doi:10.1007/bf00321807

Cited by 11 publications

(5 citation statements)

References 25 publications

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“…The different IR absorption bands that appear or shift upon adsorption of CO 2 have allowed it to be used as an excellent probe molecule to investigate different surface characteristics of oxides and alumino-silicates (especially for basic sites). In catalysis studies, the strong specific chemisorption of CO 2 on oxide-based supports for metal catalysts (and some oxide catalysts) is used to determine the extent of coverage of the catalyst on the surface of the oxide (21)(22)(23).…”

Section: Introductionmentioning

confidence: 99%

Surface Complexation Modeling and FTIR Study of Carbonate Adsorption to Goethite

Villalobos

Leckie

2001

Journal of Colloid and Interface Science

175

165

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Section: Introductionmentioning

confidence: 99%

Surface Complexation Modeling and FTIR Study of Carbonate Adsorption to Goethite

Villalobos

Leckie

2001

Journal of Colloid and Interface Science

175

165

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“…(4). Figure 6(b) shows the surface coverage as a function of Mo loading calculated from Mo/Ti intensity ratios normalized to the catalysts with 2.1 wt.% Mo.…”

Section: Surface Coverage Measurementsmentioning

confidence: 99%

Determination of the surface coverage of Mo/TiO2 catalysts by ISS and CO2 chemisorption

Rondon

Houalla

Hercules

1998

Surf. Interface Anal.

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“…Organic thin films are currently the subject of intense studies due to their potential use in new kinds of electronic devices. Organic thin films have so far proven useful in a number of applications: organic light emitting diodes, organic thin film transistors, low cost and efficient organic solar cells, as well as in supported catalyst research . Some of them are now reaching the consumer market.…”

mentioning

confidence: 99%

“…It has been shown that the surface coverage can be monitored by infrared and X‐ray photoelectron spectroscopy; low‐energy ion scattering (LEIS), and the determination of absolute surface coverage with sub‐monolayer sensitivity was demonstrated using evanescent‐wave cavity ring‐down spectroscopy (EW‐CRDS) and conventional CRDS . Using mass spectrometric methods, a semi‐quantitative determination of surface coverage was achieved by static secondary ion time‐of‐flight mass spectrometry (TOF‐SIMS) …”

mentioning

confidence: 99%

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Nonlinear behavior during semi‐quantitative analysis of thin organic layers by laser desorption mass spectrometry

Mavrinskaya

Räder

Müllen

2011

Rapid Comm Mass Spectrometry

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Characterization of the surface coverage and thickness of an organic thin film is particularly important in organic electronics and optoelectronics. For surface coverage down to the submonolayer level there is still a need for characterization methods which are easily applicable. In the present work we report on the evaluation of laser desorption mass spectrometry (LD-MS) for its use in thickness determination of organic thin films. Whereas LD-MS is well established as a soft ionization method for small molecules, its capability for use in quantitative analysis is nearly unexplored. We carried out experiments with two different molecules, 7,7,8,8-tetracyanoquinodimethane and hexabenzocoronene, in a series of experiments with increasing surface coverage. The obtained data were analyzed by plotting the LD signal intensities versus the relative layer thickness and they reveal a nonlinear behavior, which can be classified into regions of different desorption/ionization efficiencies. Visualization by atomic force microscopy reveals that the first efficiency change corresponds to the transition between incomplete and complete coverage of the metal surface by analyte molecules. A second transition is observed at high layer thickness where the signal intensity stays constant, independent of further thickness increments, and this is attributed to the limited penetration depth of the laser beam. The intermediate region between the two transitions shows a linear behavior and can thus be used for semi-quantitative thickness measurements. The efficiency change observed at the point of complete surface coverage is particularly useful for thin layer preparation of organic field effect transistors, where complete surface coverage is a minimum requirement.

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Measurement of the surface coverage of V/Al2O3 catalysts by infrared spectroscopy, CO2 chemisorption and ion scattering spectroscopy

Cited by 11 publications

References 25 publications

Surface Complexation Modeling and FTIR Study of Carbonate Adsorption to Goethite

Surface Complexation Modeling and FTIR Study of Carbonate Adsorption to Goethite

Determination of the surface coverage of Mo/TiO2 catalysts by ISS and CO2 chemisorption

Nonlinear behavior during semi‐quantitative analysis of thin organic layers by laser desorption mass spectrometry

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