Hybrid organic-inorganic gas sensing devices have been developed by means of supersonic beam co-deposition of titania clusters and copper phthalocyanine. This technique allows controlling the cluster size and structure as well as the kinetic properties of organic precursors, thus enabling both the room-temperature growth of nanocrystalline TiO2 and its functionalization. Particularly the high kinetic energy transferred to the organic molecules is exploited to enhance reactivity at the interface between the two counterparts, resulting in the synthesis of a new material with interesting gas sensing properties. The hybrid devices show improved performances as to stability and sensitivity towards oxidizing and even non-oxidizing gases, which is a remarkable result for metal-phthalocyanine based sensors. The role of the organic-inorganic interface in the development of such characteristics is briefly discussed.
1 Jan 2008
Sensors And Microsystems