Mn-Modified SnO2 and WO3 as Materials for Gas Sensors: The “Composition–Structure–Properties” Relationship

Two series of nanocomposites based on SnO2 and WO3 were synthesized by the same route—chemical precipitation of corresponding acids with subsequent thermal decomposition followed by modification with MnOx via impregnation-annealing technique. Comparative study of phase composition by X-ray diffraction and Raman spectroscopy was carried out. Microstructural parameters (particle size, specific surface area) were determined using electron microscopy and low-temperature N2 adsorption. Gas sensing properties of the nanocomposites were investigated when detecting inorganic (CO, NO, NH3) and organic (CH3OH, C6H6) gases.