THE EFFECT OF DIFFERENT METAL CATION INCORPORATION IN ARACHIDIC ACID LANGMUIR-BLODGETT (LB) MONOLAYER FILMS

In the present communication one monolayer Langmuir-Blodgett (LB) film s of cadmium arachidate (CdA), lead arachidate (PbA), calcium arachida te (CaA), zinc arachidate (ZnA) and barium arachidate (BaA) have been investigated using core level loss spectroscopy, electron energy loss spectroscopy (EELS) and near-edge X-ray absorption fine structure spec troscopy (NEXAFS), The core level loss spectra and electron energy los s spectra of all the films were largely similar. This has been attribu ted to the similarity of the band structure of these films. which depe nds on the hydrocarbon chains rather than the cation incorporated. The NEXAFS spectra show a large angular dependence for the PbA film and b arely any angular dependence for BaA. A possible explanation for this observation has been offered on the basis of electronegativities of th e cations. (C) 1998 Elsevier Science B.V.