Influence of Synthesis Conditions on Microstructure and NO(2) Sensing Properties of WO(3) Porous Films Synthesized by Non-Hydrolytic Sol–Gel Method

Nanostructured tungsten trioxide porous films were prepared by a non-hydrolytic sol–gel method following the inorganic route in which ethanol and PEG were used as the oxygen-donor and structure-directing reagent, respectively. The effects of aging time of the precursor solution, PEG content, and calcination temperature on the structure, morphology, and NO(2) sensing properties of WO(3) films were systematically investigated by using the techniques of X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, and gas sensing measurements. The results demonstrated that a series of WO(3) films with different microstructures could be obtained by manipulating the synthesis parameters. Furthermore, a suitable synthesis condition of WO(3) films for NO(2) sensing application was determined.