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This paper is focused on the effect of the stabilizing component SiO 2 on the type and concentration of active sites in SnO 2 /SiO 2 nanocomposites compared with nanocrystalline SnO 2 . Previously, we found that SnO 2 /SiO 2 nanocomposites show better sensor characteristics in CO detection (lower detection limit, higher sensor response, and shorter response time) compared to pure SnO 2 in humid air conditions. Nanocomposites SnO 2 /SiO 2 synthesized using the hydrothermal method were characterized by low temperature nitrogen adsorption, XRD, energy dispersive X-ray spectroscopy (EDX), thermo-programmed reduction with hydrogen (TPR-H 2 ), IR-, and electron-paramagnetic resonance (EPR)-spectroscopy methods. The electrophysical properties of SnO 2 and SnO 2 /SiO 2 nanocomposites were studied depending on the oxygen partial pressure in the temperature range of 200-400 °C. The introduction of SiO 2 results in an increase in the concentration of paramagnetic centers Sn 3+ and the amount of surface hydroxyl groups and chemisorbed oxygen and leads to a decrease in the negative charge on chemisorbed oxygen species. The temperature dependences of the conductivity of SnO 2 and SnO 2 /SiO 2 nanocomposites are linearized in Mott coordinates, which may indicate the contribution of the hopping mechanism with a variable hopping distance over local states.

Nanocomposites SnO2/SiO2:SiO2 Impact on the Active Centers and Conductivity Mechanism