CO2 sensing properties of semiconducting copper oxide and spinel ferrite nanocomposite thin film

A new active layer for CO2 sensing based on semiconducting CuO-Cu x Fe3a degree x O4 (with 0a[control][curren] x a[control][curren]1) nanocomposite was prepared by radiofrequency sputtering from a delafossite CuFeO2 target using a specific in situ reduction method followed by post annealing treatment in air. The tenorite-spinel ferrite nanocomposite layer was deposited on a simplified test device and the response in a carbon dioxide atmosphere was measured by varying the concentration up to 5000ppm, at different working temperatures (130-475A degree C) and frequencies (0.5-250kHz). The results showed a high response of 50% ( R air / R C O 2 = 1.9 ) at 250A degree C and 700Hz for a CO2 concentration of 5000ppm.