THE INFLUENCE OF AMBIENT TEMPERATURE ON THE THERMODYNAMIC INTERACTIONS GOVERNING AMMONIA ADSORPTION ON THE SURFACE OF PLATINUM NANOPARTICLES/INDIUM GALLIUM OXIDE SENSOR

A sensor for detecting ammonia (NH[Formula: see text] has been developed by integrating indium gallium oxide (IGO) thin films with platinum (Pt) nanoparticles. The IGO thin films were fabricated using the radio frequency magnetron sputtering technique, while the Pt nanoparticles were deposited through a thermal evaporation process under vacuum conditions. The incorporation of Pt nanoparticles dramatically improved the sensing performance toward NH 3 . Extensive characterization of the sensor was conducted to analyze its structural properties, elemental composition, and material characteristics. Experimental results demonstrated that the Pt nanoparticle-decorated IGO sensor achieved a remarkable sensitivity ratio ([Formula: see text] of 209.4, when exposed to 1000[Formula: see text]ppm NH 3 in air at an operating temperature of [Formula: see text]C. The sensor demonstrates outstanding selectivity toward NH 3 and exhibits stability under the humidity condition. Notably, even when exposed to a low concentration of 1[Formula: see text]ppm NH 3 in air, the sensor still demonstrated a notable sensitivity ratio of 1.29. To realize the sensing mechanism, an investigation into the adsorption of NH 3 molecules on the surface of sensor was implemented.