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Pure semiconductor tungsten oxide (WO 3 ), indium oxide (In 2 O 3 ) and mixed nanocomposites with different WO 3 to In 2 O 3 ratios were successfully synthesized by simple sol-gel method following calcination at 600 °C. The morphology, phase composition and features of crustal structure of the materials were studied by X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, transition electron microscopy and electron paramagnetic resonance spectroscopy. It was found that the nanocomposite materials are characterized by fine crystallinity of 8–38 nm, highly defective crystal cells and presence of delocalized electrons in their structures, which can significantly affect gas sensitivity. The gas sensors based on WO 3 –In 2 O 3 composite structures exhibited excellent CO and NO 2 detecting performance at optimal operating temperature of ∼240 °C and ∼140 °C, respectively. © 2019, QC 20201008