Low power consumption and fast response H₂S gas sensor based on a chitosan-CuO hybrid nanocomposite thin film

In this work, a novel selective and low temperature H₂S gas sensor was fabricated based on copper (II) oxide nanoparticles (CuO NPs) in different concentrations, embedded in a conductivity-engineered organic (glycerol ionic liquid-doped chitosan) membrane/film. The sensing membranes of organic-inorganic nanocomposites (CS-IL-CuO) were prepared by casting method and were tested against H₂S gas with reference to time at different temperatures and H₂S gas concentrations. The fabricated sensor showed a fast response (14 s) and good sensitivity (15 ppm) towards H₂S gas at a low temperature of 40 °C. Moreover, the sensor showed a high reversibility and less humidity dependence at 40 °C. Moreover, this type of hybrid nanocomposites sensor is easy and inexpensive to manufacture and is energy efficient. Thus, it has potential to be used for industrial applications in harsh environments.