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Nanocomposites In₂O₃/Ag obtained by ultraviolet (UV) photoreduction and impregnation methods were studied as materials for CO sensors operating in the temperature range 25⁻250 °C. Nanocrystalline In₂O₃ and In₂O₃/Ag nanocomposites were characterized by X-ray diffraction (XRD), single-point Brunauer-Emmet-Teller (BET) method, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and high angle annular dark field scanning transmission electron microscopy (HAADF-STEM) with energy dispersive X-ray (EDX) mapping. The active surface sites were investigated using Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR) spectroscopy and thermo-programmed reduction with hydrogen (TPR-H₂) method. Sensor measurements in the presence of 15 ppm CO demonstrated that UV treatment leads to a complete loss of In₂O₃ sensor sensitivity, while In₂O₃/Ag-UV nanocomposite synthesized by UV photoreduction demonstrates an increased sensor signal to CO at T &lt; 200 °C. The observed high sensor response of the In₂O₃/Ag-UV nanocomposite at room temperature may be due to the realization of an additional mechanism of CO oxidation with participation of surface hydroxyl groups associated via hydrogen bonds.

Effects of Ag Additive in Low Temperature CO Detection with In2O3 Based Gas Sensors