The gas sensing properties of chloro-aluminium phthalocyanine thin films

The behaviour of ClAlPc thin film gas sensors is studied in the presence of NO₂ and O₂. The change in the dark conductivity of ClAlPc thin films on exposure to NO₂ at several different temperatures is investigated. In particular, the temperature of maximum sensitivity (T_max) and the minimum temperature for good reversibility (T_min) of ClAlPc thin films has been determined and related to gas sensor applications. Sensitivity (s) of ClAlPc to NO₂ is also measured at several different temperatures. It is found that by increasing temperature the sensitivity decreases, but reversibility is greatly enhanced