Europium Bisphthalocyanine-NO2 Interactions in Monolayers: Spectroscopic and Electrical Measurements

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The electronic and surface-enhanced resonant Raman spectra of europium bisphthalocyanine (EuPc2) are used to monitor the adsorption of NO2 onto EuPc2 Langmuir-Blodgett (LB) monolayer films. The reaction was also monitored in solution, and the complex formed was studied by electron paramagnetic resonance (EPR) spectroscopy. Conductivity measurements of the LB film have shown a two-stage process due to exposure to NO2 gas: adsorption on the surface, and absorption into the film. After a complete desorption by annealing, film conductivity rises continuously with time of exposure to gas to a saturation point. EPR measurements suggest that the EuPc2 structure is irreversibly changed by the material gas interaction, although the adsorption is reversible.
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