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RESEARCH PRODUCT
Study of the phase composition of iron-containing Langmuir-Blodgett layers before and after thermal and chemical treatment
Philipp GütlichW. Meiselsubject
HydrogenInorganic chemistryIron oxidechemistry.chemical_elementNascent hydrogenSurfaces and InterfacesGeneral ChemistryCondensed Matter PhysicsLangmuir–Blodgett filmSurfaces Coatings and FilmsAmorphous solidMetalchemistry.chemical_compoundchemistryStearatevisual_artMaterials Chemistryvisual_art.visual_art_mediummedicineFerricmedicine.drugdescription
Iron-containing Langmuir–Blodgett mono- and multilayers were prepared by depositing ferric stearate onto silicon wafers. Particular care should be taken in order to avoid the presence of alkali ions, which may replace iron ions in the deposited film. By a subsequent heating in air, the fatty acid chains were thermodesorbed. This results in a rather homogeneous coating of the samples by an iron oxide, most probably in the form of crystalline and amorphous γ-FeOOH, as found by conversion electron Mossbauer, photoelectron and microprobe studies. By a subsequent heating in hydrogen gas or exposure to nascent hydrogen, a partial reduction of the iron oxide layer is possible up to the metallic state (α-Fe). The Mossbauer spectra show the formation of a mixture of different iron species (Fe3+, Fe2+, Fe0) depending on the reductive treatment.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1992-06-01 | Surface and Interface Analysis |