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Národní úložiště šedé literatury Nalezeno 2 záznamů.  Hledání trvalo 0.00 vteřin. 
Application of Scanning Probe Microscopy for the Study of Ultrathin Films and Nanostructures
 Neuman, Jan ; Rezek, Bohuslav (oponent) ; Mašláň, Miroslav (oponent) ; Šikola, Tomáš (vedoucí práce)
The doctoral thesis is focused on the study of ultrathin layers and the utilization of atomic force microscopy (AFM) for their characterization. Morphological changes of ultrathin layer of gold on silica substrates at elevated temperatures were experimentally investigated. It was found that surface modification influences the formation of the voids in the gold layer. By the controlled dewetting of gold layer is possible to influence the formation of gold islands at elevated temperatures. Precise surface modification by electron beam lithography enabled preparation of ordered arrays of gold islands with the uniform size in range of 50 – 400 nm. It is also shown, that the increase of annealing temperature to 1000 °C induces embedding of the gold islands into the substrate. This phenomenon is probably caused by the silica transfer from the area bellow the islands to the rim. AFM methods are suitable for characterization of above mentioned nanostructures. The AFM working under the ultra-high vacuum conditions was developed at the Institute of Physical Engineering. Piezoelectric actuators are utilized for the sample approach and adjustment of the mirror used in optical detection system. The optimization was achieved by the systematic study of the driving pulse parameters. High stability and operating speed was achieved by the experimental measurements of the actuator response to the pulse shape and repetition frequency.
Úplný záznam
Application of Scanning Probe Microscopy for the Study of Ultrathin Films and Nanostructures
 Neuman, Jan ; Rezek, Bohuslav (oponent) ; Mašláň, Miroslav (oponent) ; Šikola, Tomáš (vedoucí práce)
The doctoral thesis is focused on the study of ultrathin layers and the utilization of atomic force microscopy (AFM) for their characterization. Morphological changes of ultrathin layer of gold on silica substrates at elevated temperatures were experimentally investigated. It was found that surface modification influences the formation of the voids in the gold layer. By the controlled dewetting of gold layer is possible to influence the formation of gold islands at elevated temperatures. Precise surface modification by electron beam lithography enabled preparation of ordered arrays of gold islands with the uniform size in range of 50 – 400 nm. It is also shown, that the increase of annealing temperature to 1000 °C induces embedding of the gold islands into the substrate. This phenomenon is probably caused by the silica transfer from the area bellow the islands to the rim. AFM methods are suitable for characterization of above mentioned nanostructures. The AFM working under the ultra-high vacuum conditions was developed at the Institute of Physical Engineering. Piezoelectric actuators are utilized for the sample approach and adjustment of the mirror used in optical detection system. The optimization was achieved by the systematic study of the driving pulse parameters. High stability and operating speed was achieved by the experimental measurements of the actuator response to the pulse shape and repetition frequency.
Úplný záznam

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