Preparation and characterization of Langmuir-Blodgett-type arachidate films

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19 Citations (Scopus)

Abstract

Metal arachidate Langmuir-Blodgett (LB) films with Pb2+ and Cd2+ cations and varying numbers of monomolecular layers (2 and 4 monolayers, ML) were deposited on trimethylsilylated glass substrates. The arachidate salt formation was commenced during the film deposition from a water-based solution. The extent of salt formation and the build-up of the LB layer were evaluated by quantitative XPS. The completeness of the salt formation was assessed by the atomic ratio of the carboxylic (-COO)-type carbon component with C 1s binding energy at ∼288.5 eV to that of the selected line of the actual cation. The surface coverage of the glass substrate by the LB film was assessed by calculations based on a substrate-overlayer model using the XPS MultiQuant program. According to this model, the attenuation of the Si 2p photoelectron signal from the substrate by the 2 and 4 ML LB films (with 56 and 112 Å thickness, respectively) was calculated and compared with the measured intensities, enabling the completeness of the layer to be evaluated. The layer thickness values calculated from the measured intensity of the layer constituents reflected accurately the thickness derived from the geometry of the arachidate molecule, confirming both the adequacy of the model and the accuracy of the measurement. In agreement with earlier results it was confirmed that salt-based LB films are fairly stable under high vacuum conditions, although slow decomposition of lead arachidate films was detected during prolonged x-ray irradiation.

Original languageEnglish
Pages (from-to)772-776
Number of pages5
JournalSurface and Interface Analysis
Volume34
Issue number1
DOIs
Publication statusPublished - aug. 2002

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Langmuir Blodgett films
Langmuir-Blodgett films
Salts
Monolayers
preparation
salts
Substrates
Cations
completeness
X ray photoelectron spectroscopy
Positive ions
Glass
x ray irradiation
cations
Photoelectrons
Binding energy
adequacy
glass
high vacuum
Carbon

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

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title = "Preparation and characterization of Langmuir-Blodgett-type arachidate films",
abstract = "Metal arachidate Langmuir-Blodgett (LB) films with Pb2+ and Cd2+ cations and varying numbers of monomolecular layers (2 and 4 monolayers, ML) were deposited on trimethylsilylated glass substrates. The arachidate salt formation was commenced during the film deposition from a water-based solution. The extent of salt formation and the build-up of the LB layer were evaluated by quantitative XPS. The completeness of the salt formation was assessed by the atomic ratio of the carboxylic (-COO)-type carbon component with C 1s binding energy at ∼288.5 eV to that of the selected line of the actual cation. The surface coverage of the glass substrate by the LB film was assessed by calculations based on a substrate-overlayer model using the XPS MultiQuant program. According to this model, the attenuation of the Si 2p photoelectron signal from the substrate by the 2 and 4 ML LB films (with 56 and 112 {\AA} thickness, respectively) was calculated and compared with the measured intensities, enabling the completeness of the layer to be evaluated. The layer thickness values calculated from the measured intensity of the layer constituents reflected accurately the thickness derived from the geometry of the arachidate molecule, confirming both the adequacy of the model and the accuracy of the measurement. In agreement with earlier results it was confirmed that salt-based LB films are fairly stable under high vacuum conditions, although slow decomposition of lead arachidate films was detected during prolonged x-ray irradiation.",
keywords = "Arachidic acid, Langmuir-Blodgett film, Layer thickness, XPS, XPS MultiQuant",
author = "M. Mohai and E. Kiss and A. T{\'o}th and J. Szalma and I. Bert{\'o}ti",
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T1 - Preparation and characterization of Langmuir-Blodgett-type arachidate films

AU - Mohai, M.

AU - Kiss, E.

AU - Tóth, A.

AU - Szalma, J.

AU - Bertóti, I.

PY - 2002/8

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N2 - Metal arachidate Langmuir-Blodgett (LB) films with Pb2+ and Cd2+ cations and varying numbers of monomolecular layers (2 and 4 monolayers, ML) were deposited on trimethylsilylated glass substrates. The arachidate salt formation was commenced during the film deposition from a water-based solution. The extent of salt formation and the build-up of the LB layer were evaluated by quantitative XPS. The completeness of the salt formation was assessed by the atomic ratio of the carboxylic (-COO)-type carbon component with C 1s binding energy at ∼288.5 eV to that of the selected line of the actual cation. The surface coverage of the glass substrate by the LB film was assessed by calculations based on a substrate-overlayer model using the XPS MultiQuant program. According to this model, the attenuation of the Si 2p photoelectron signal from the substrate by the 2 and 4 ML LB films (with 56 and 112 Å thickness, respectively) was calculated and compared with the measured intensities, enabling the completeness of the layer to be evaluated. The layer thickness values calculated from the measured intensity of the layer constituents reflected accurately the thickness derived from the geometry of the arachidate molecule, confirming both the adequacy of the model and the accuracy of the measurement. In agreement with earlier results it was confirmed that salt-based LB films are fairly stable under high vacuum conditions, although slow decomposition of lead arachidate films was detected during prolonged x-ray irradiation.

AB - Metal arachidate Langmuir-Blodgett (LB) films with Pb2+ and Cd2+ cations and varying numbers of monomolecular layers (2 and 4 monolayers, ML) were deposited on trimethylsilylated glass substrates. The arachidate salt formation was commenced during the film deposition from a water-based solution. The extent of salt formation and the build-up of the LB layer were evaluated by quantitative XPS. The completeness of the salt formation was assessed by the atomic ratio of the carboxylic (-COO)-type carbon component with C 1s binding energy at ∼288.5 eV to that of the selected line of the actual cation. The surface coverage of the glass substrate by the LB film was assessed by calculations based on a substrate-overlayer model using the XPS MultiQuant program. According to this model, the attenuation of the Si 2p photoelectron signal from the substrate by the 2 and 4 ML LB films (with 56 and 112 Å thickness, respectively) was calculated and compared with the measured intensities, enabling the completeness of the layer to be evaluated. The layer thickness values calculated from the measured intensity of the layer constituents reflected accurately the thickness derived from the geometry of the arachidate molecule, confirming both the adequacy of the model and the accuracy of the measurement. In agreement with earlier results it was confirmed that salt-based LB films are fairly stable under high vacuum conditions, although slow decomposition of lead arachidate films was detected during prolonged x-ray irradiation.

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