In this research project it is proposed to carry out a systematic study to understand the mechanisms of solid-gas interaction that occur on the surface of pure and hybrid tin oxide nanostructures (SnO2-CuO and/or SnO2-CuO-Pt) which are responsible for the properties of these materials as gas sensor. Materials will be synthesized by the microwave-assisted solvothermal method and then will be characterized by X-ray diffraction, high resolution scanning and transmission electron microscopy and specific surface area measurement. The materials will be also characterized in respect to their behavior as gas sensor in the presence of oxidizing and reducing gases (e.g, NO2, CO, H2) at low concentrations (in ppm scale) and at operating temperatures between 100 and 400 °C. The great challenge of the work is the in situ characterization of nanostructures by Diffuse Reflectance Infrared Spectroscopy and X-ray absorption near edge structure techniques that will be performed simultaneously with electrical measurements under similar conditions of sensor operation. The originality of the work is to understand the phenomena responsible for the responses of materials through in situ and operating measurements and, thereafter, the possibility to develop sensor devices that are faster, more sensitive and selective with possible technological applications.
News published in Agência FAPESP Newsletter about the scholarship: