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Bachelor's Thesis
Author of thesis: Ing. Jonáš Gloss
Acad. year: 2011/2012
Supervisor: doc. Ing. Jindřich Mach, Ph.D.
Reviewer: prof. RNDr. Jiří Spousta, Ph.D.
The purpose of this thesis was to study the preparation and analysis of nanostructures in Ultra High Vacuum (UHV) conditions. The theory section has a strong emphasis on Gallium Nitride (GaN) nanostructures. These were then analyzed by Scanning Tunneling Microscope (STM). In order to be able to analyze prepared samples in UHV STM, electrochemical etching of tungsten wire was carried out. This thesis gives an account on how to obtain tungsten tips for STM. The section dealing with tungsten tip fabrication includes description of electrochemical etching principle. Scanning Electron Microscope (SEM) images of etched tips and their further sharpening by Focused Ion Beam (FIB) was carried out. In this work a method for in-situ UHV STM tip revitalization by electron annealing is proposed. It was concluded that it is possible to routinely obtain tungsten tips with apex radius in the order of nanometers.
STM, SPM, Electrochemical etching, SEM, FIB, tungsten tips, GaN, UHV, MBE
Date of defence
19.06.2012
Result of the defence
Defended (thesis was successfully defended)
Grading
D
Language of thesis
English
Faculty
Fakulta strojního inženýrství
Department
Institute of Physical Engineering
Study programme
Applied Sciences in Engineering (B3901-3)
Field of study
Physical Engineering and Nanotechnology (B-FIN)
Composition of Committee
prof. RNDr. Tomáš Šikola, CSc. (předseda) prof. RNDr. Miroslav Liška, DrSc. (místopředseda) prof. RNDr. Bohumila Lencová, CSc. (člen) prof. RNDr. Jiří Komrska, CSc. (člen) prof. RNDr. Petr Dub, CSc. (člen) prof. RNDr. Radim Chmelík, Ph.D. (člen) prof. RNDr. Jiří Spousta, Ph.D. (člen) prof. Ing. Ivan Křupka, Ph.D. (člen) prof. RNDr. Pavel Zemánek, Ph.D. (člen) RNDr. Antonín Fejfar, CSc. (člen)
Supervisor’s reportdoc. Ing. Jindřich Mach, Ph.D.
Grade proposed by supervisor: C
Reviewer’s reportprof. RNDr. Jiří Spousta, Ph.D.
Grade proposed by reviewer: D
Responsibility: Mgr. et Mgr. Hana Odstrčilová