Europium bisphthalocyanine LB films for gas sensibility and selectivity

Abstract

Gas-sensing properties of Europium bisphthalocyanine LB films for NH₃, $\text{NO}{}_{\mathrm{x}}\text{(x=1,}\text{2)}$ and Cl₂ were investigated. No responses were observed when EuPc^′₂ LB films were exposed to 50 ppm NH₃ and $\text{NO}{}_{\mathrm{x}}\text{(x=1,}\text{2)}$, respectively. EuPc^′₂ LB films were found to produce a very fast response when exposed to Cl₂, even at the 2 ppm level. At low-concentration levels (up to ∼80 ppm), the conductivity changes linearly with the concentrations of Cl₂. The electronic spectroscopic characterization of the LB films is also given.