Synthesis and characterization of ITO–ZnO nanocomposite and its application as NO2 gas sensor

ITO–ZnO nanocomposite films with controllable chemical composition, structure and morphology were prepared by screen printing method. Various series of samples containing different In/Zn ratios were prepared. The chemical composition, structure and morphology were investigated by energy-dispersive X-ray spectroscopy, X-ray diffraction, atomic force microscopy and transmission electron microscopy; revealing that structure and morphology depends strongly on chemical composition. The gas sensing performances were tested in NO2-containing air. The experimental results are discussed in relation to the chemical composition and microstructural properties.