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Study of catalytic oxidation of carbon monoxide by AFM/SEM
Hrůza, Dominik ; Janák, Marcel (referee) ; Bábor, Petr (advisor)
This diploma thesis focuses on the study of carbon monoxide oxidation on platinum using correlative AFM/SEM microscopy, which has been overlooked in the literature in this field of research. In the introduction is provided a description of the functioning of the used methods. Furthermore, the investigated reaction is theoretically explained, the oxides on platinum are described, and current directions of scientific research are discussed. The experimental part closely follows the theoretical section, where is described the transfer of the experiment between electron microscopes and the challenges associated with this transfer. This is followed by in-situ observations of the influence of ion beam modifications on the studied reaction. These measurements are compared by using electron and ion beams, and is provided a description of individual surface processes. The experimental results demonstrate new possibilities for influencing chemical reactions through surface modification and provide evidence supporting the theory of subsurface forms of oxides. Subsequently, the effects of the tip on the reaction are investigated, presenting the possibility of direct surface modification by engraving. In conclusion, time-resolved spectroscopy and surface mapping of the desorption reaction wave is carried out to elucidate the influence of the chemical wave passing under the tip. The thesis also includes surface spectroscopic analyses to support the conclusions drawn in this thesis.
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