The main goal of this research project is to study the performance of p-type nanostructured semiconducting oxides as well to understand the main mechanisms for gas detection properties on these materials. Nanostructured semiconductor oxides will be obtained by microwave-assisted hydrothermal synthesis, aiming fine control of the morphology, size and crystalline phase, and, thereafter, will be characterized by X-ray diffraction, scanning electron microscopy and transmission and electrical measurements by impedance spectroscopy. The materials behavior as gas sensor will also be characterized on presence of oxidizing and reducing gases (e.g. NO2, CO, H2S) at low concentrations (range of ppm), and operating temperature in the range between 100 °C to 400 °C. The challenging and innovative part of this project is the use of electrical measurements and spectroscopic techniques, Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) and X-ray Absorption Near-Edge Structure Spectroscopy (XANES), under similar sensor conditions aiming the in situ and operando monitoring of gas-solid interactions on the surface of nanostructures. The development of this project is expected to contribute significantly to scientific and technological development in the nanotechnology and gas sensors fields.
News published in Agência FAPESP Newsletter about the scholarship: