Školitel: Prof. RNDr. Karel Mašek, Ph.D.
Stav práce: volná
Anotace:
Reducible oxide layers are currently used in many laboratory and industrial applications. These layers are used as the basic material of various catalysts and chemical sensors. Gas detection by this type of sensor is based on a change in the conductivity of the layer due to, for example, a reducing environment. The microstructure and morphology of these layers determine their physicochemical properties, and they can be modified by reducing the layer during preparation or by adding active metals such as Pd, Pt, Au, etc.
The task of the doctoral thesis is the preparation of pure and modified reducible oxide layers (cobalt oxide, tungsten oxide, cerium oxide ..) and the measurement of their morphological and gas-sensing properties. The layers will be prepared by magnetron sputtering onto the surface of glass or passivated silicon and will be doped with any active metal. The conductivity of the thin layer is measured by the four-point or two-point method and the sensor response to the reaction atmosphere is monitored in the sensor test station. The chemical composition and chemical state of the investigated surfaces will be analyzed by the photoelectron spectroscopy (XPS) method using a multi-channel hemispherical analyzer. The surface morphology of the oxide layer is checked in air by AFM and SEM methods. All of the above methods are available at our workplace.
Prerequisites
It is assumed that the graduate has completed a degree in physics with a focus on condensed matter physics.
Literature
[1] D. Briggs, M.P. Seah: Practical Surface Analysis, vol. 2 - Auger and X-ray Photoelectron spectroscopy, Wiley, 1990
[2] selected articles from international journals