The work presents the synthesis and characterization of ${\mathrm{TiO}}_2-{\mathrm{SnO}}_2$ nanocomposites. In the first stage of the synthesis, nanocrystalline ${\mathrm{TiO}}_2$ were produced with calcination method, and then ${\mathrm{SnO}}_2$ was entered with high-temperature crystallization. The materials were characterized by X-ray diffraction (XRD), surface area estimated from the ${\mathrm{N}}_2$ physisorption isotherm (BET), high-resolution transmission electron microscopy (HRTEM), scanning transmission electron microscopy (STEM). Based on conducted studies, it was found that presented synthesis method of nanopowders ${\mathrm{TiO}}_2-{\mathrm{SnO}}_2$ with calcination, enable to receive not only materials with known and controlled chemical composition and phase, but also enable to receive the composite of diversified sizes of ${\mathrm{TiO}}_2$ and ${\mathrm{SnO}}_2$particles. It was also stated that obtaining composite nanopowders with calcination method allows for precise control of the grains size of both ${\mathrm{TiO}}_2$ and ${\mathrm{SnO}}_2$ produced on the nanometric level. 

The work also describes the effect of physicochemical properties of produced nanocomposites${\mathrm{TiO}}_2-{\mathrm{SnO}}_2$ on the response of gas sensors carried out on their base.

Acknowledgements This work was made with financial support of the National Science Centre (NCN) based on the decision number DEC 2015/19/N/ST8/0018.