P. Ganguly

Deposition of thin films of TiO2 from Langmuir–Blodgett film precursors

Excellent quality thin TiO2 films have been obtained by the thermal decomposition of n‐octadecyl amine‐titanyl oxalate complex multilayer Langmuir–Blodgett films. The films were characterized by x‐ray diffraction and x‐ray photoemission studies. X‐ray diffraction studies suggest a preferred orientation of the TiO2 films.

Attenuation length measurements in cadmium arachidate Langmuir–Blodgett films

Attenuation lengths in cadmium arachidate [(C19H39COO)2Cd] multilayer Langmuir–Blodgett films deposited on thick lead arachidate [(C19H39COO)2Pb] films have been determined in this communication. A discrete layer model appropriate to the ordered structure of these built‐up films is proposed and applied for the first time to the measurements of the x‐ray photoemission intensity variation with electron takeoff angle and attenuation lengths for 950–1350 eV electrons are evaluated. These lengths agree with earlier attenuation length measurements in Langmuir–Blodgett films and are higher than in most inorganic materials.

On the deposition of thin TiO2 films from Langmuir Blodgett film precursors. An electron spectroscopy study

Abstract X-Ray photoemission and reflection electron energy loss spectroscopies have been used to characterize ultrathin TiO 2 films obtained by thermal decomposition of Langmuir Blodgett films of n -octadecyl amine which were used to pick up titanyl oxalate ions from the aqueous subphase. The dielectric function of the film was obtained by a Kramers-Kronig analysis of the electron energy loss spectra, which show features characteristic of TiO 2 . A detailed Tougaard analysis of the photoemission core level background signal was performed to obtain the composition depth profile of the various elements and make an estimate of the film thickness.

Application of Tougaard background subtraction to Langmuir-Blodgett films

Abstract The inelastic background subtraction algorithm proposed by Tougaard is applied for the first time to the X-ray photoemission spectra of metal salts of arachidic acid Langmuir-Blodgett films. The background deconvolution procedure has been done using the inelastic scattering cross-section determined from reflection electron energy loss spectroscopy and using a “universal” inelastic scattering cross-section. Both approaches give physically meaningful and nearly identical primary excitation spectra. The range of validity of the deconvolution formulae is investigated by varying the electron emission angle. Possible reasons for the applicability of the Tougaard algorithm to materials containing molecules with dimensions of the order of the inelastic scattering length, as are obtained for the Langmuir-Blodgett films in this study, are discussed.

Attenuation length measurements in lead arachidate Langmuir Blodgett films

In this paper the attenuation length measurements in lead arachidate [(C19H39COO)2Pb] Langmuir Blodgett films deposited on copper was reported on. A discrete layer model appropriate to the ordered structure of these built up films is applied to the measurements of the x‐ray photoemission intensity variation with electron takeoff angle and attenuation lengths for Pb 4f7/2, O 1s and Cu 2p3/2 electrons (kinetic energy range 550–1350 eV) are determined. There is evidence for the dependence of the attenuation length on the dielectric properties of the film/substrate interface through a variation of the film thickness.

Stability of CuO surfaces to reactions with adsorbed n-butyl amine: An X-ray photoelectron spectroscopy study☆

Abstract The reaction of n -butyl amine adsorbed on the binary oxide CuO has been studied by X-ray photoelectron spectroscopy at various temperatures, paying special attention to the surface composition. n -Butyl amine is found to reduce the oxidation state of copper. The reversibility of the surface chemical states on re-oxidation has been investigated especially. Evidence for the formation of peroxide ions or of multimeric oxygen species formed on re-oxidation is presented. CuO is found to be regenerated on re-oxidation.