Přístupnostní navigace
E-application
Search Search Close
Branch Details
Original title in Czech: Pokročilé nanotechnologie a mikrotechnologieCEITEC VUTAbbreviation: PNTMTAcad. year: 2013/2014
Programme: Advanced Materials and Nanosciences
Length of Study: 4 years
Guarantor
prof. RNDr. Tomáš Šikola, CSc.
Issued topics of Doctoral Study Program
Laser-Induced Breakdown Spectroscopy (LIBS) is a technique that utilizes high power-densities obtained by focusing the radiation from a pulsed laser to generate a luminous micro-plasma from an analyte in the focal region. The micro-plasma emission is subsequently analyzed by a spectrometer. The plasma composition is representative to the analyte's elemental composition. The topics of the dissertation work include the application of LIBS and its modifications for high-resolution elemental mapping of solid samples.
Tutor: Kaiser Jozef, prof. Ing., Ph.D.
Tutor: Chmelík Radim, prof. RNDr., Ph.D.
Application of spectroscopic reflectometry to the study of lubrication films to obtain their thickness and refractive index within highly loaded lubricated contact. The main aim of this study is to develop a physically correct approach that could provide the additional information about the properties of lubricant film.
Tutor: Křupka Ivan, prof. Ing., Ph.D.
Study of rheological properties of thin lubrication film through the in situ observation of the particles movement within the lubricated contact. Colorimetric interferometry will be used to measure the film thickness distribution from chromatic interferograms while the image analysis will provide the trajectory of the particles within the lubricated contacts. Such an approach will enable to consider the changes in the rheological properties of lubricant within the contact.
Study of lubricant film formation between rubbing surfaces of joint implants to describe the effect of proteins on friction and wear reduction. Colorimetric interferometry combined with fluorescence microscopy will be used to evaluate changes in film thickness as a function of bovine serum composition that will simulate the properties of synovial fluid.
Tutor: Šikola Tomáš, prof. RNDr., CSc.
The goal is to propose the methodology for the supercapacitor lifetime prediction with respect to the attainment of 10 years life time guarantee required for the applications in the satellite systems. The methodology should be based on: 1) Analysis of the charge transport and the dependence of capacitance on the bias voltage or frequency, respectively, for capacitors of capacitance 1 to 100 F. 2) Analysis of time dependences for the charging of capacitors with constant current or constant voltage, respectively. 3) Supercapacitor’s self-discharge analysis. 4) Measurement of capacitance of Helmholtz layer and diffuse layer.
Tutor: Sedláková Vlasta, doc. Ing., Ph.D.
A few years ago, a component called a memristor, which in theory was already described in 1971, was finally made. Currently advanced technologies that will improve properties and reduce cost of production are under developing. The actual preparation of the memristor is not easy because of two stoichiometric phases of used material which were discovered phenomenon in. The aim of the work is the use of advanced techniques based on anodization and the simultaneous use of self-ordering in several material to create highly aligned network of memristors. Subsequently, to characterize them and to test the network connection to the demonstration network and show their properties for applications for which they are appropriate used such as memory and artificial neural networks.
Tutor: Hubálek Jaromír, prof. Ing., Ph.D.
The aim of the doctoral dissertation will be analysis of electronic noise in monocrystalline samples of CdTe radiation sensors and sensors produced on CdTe based. Will be studied the issue of noise sources 1/f, taking into account the fluctuations in the number of charge carriers or their mobility. Noise spectral density is very strongly dependent on the temperature, lighting and electric field. Experimentally will analyzed the number of free charge carriers controlled by an electric field, by lighting and by working temperature. Results will be interpreted for noise sources, contacts, surface and volume of the samples. From dependence and the shape of the spectral noise density will be determined number of carriers, energy levels and location of defects.
Tutor: Grmela Lubomír, prof. Ing., CSc.
Semiconductor quantum dots (QDs) are of special interest as light-emitting particles on the nanometer scale that belong to new class of fluorescent probes for in vivo biomolecular and cellular imaging. In comparison with organic dyes, QDs have unique optical and electronic properties. QDs were found to be very important tool in disease diagnoses. Influenza is infectious disease of respiratory tract causing high morbidity and mortality in a risky group. QDs can be used for distinction of influenza type and thus right medicine can be applied for disease treatment. The aim of the work is preparation of QDs and their complexes with influenza ODN and study of their properties. Electrochemical methods will be used for analyses of metal and ODN. Capillary electrophoresis and in vivo imaging are also powerful tools for complexes characterization. Conjugation with magnetic particles will be used for automatic analyses of the samples.
Tutor: Kizek René, prof. Ing., Ph.D.
The aim of this project is to determine parameters of traps in insulation layer of HFET/HEMT structures by analysis of its noise characteristics, mainly RTS (random telegraph signal) noise. Experimental work is based on measurement of temperature dependence of noise using helium cryostat and study of amplitude and mean time of capture and emission as a function of electric field intensity and charge carrier concentration in channel. These results will be used to improve generation-recombination model of noise origin and localization of traps.
Tutor: Pavelka Jan, doc. Mgr., CSc. Ph.D.
The main aim of the thesis is to develop a methodology for application of neural cells on a microelectronic chip and examine conditions for their interconnection. The metodology and its optimization should be focused on the selection of appropriate cells, their cultivation and ensuring physilogical conditions on the chip for their long term survival. Further the work will be oriented to research of ability of cells to transmit electrical signals and to the possibility of targeted programming of created network.
The thesis will put specific emphasis on application of advanced Scanning Probe Microscopy (SPM – AFM, SNOM) techniques in Life Sciences imaging of biological and soft-matter object. Since biomolecules are not as robust as classical nanostructures, such as, for example, carbon nanotubes or metal nanoparticles, special precautions should be taken to avoid deformation of the molecules during the measurement. The experimental work would include deposition of various biomolecules, their AFM imaging and analysis of the experimental data as well as demonstration of advanced SPM modes.
Tutor: Tománek Pavel, prof. RNDr., CSc.
Materials exhibiting high permittivity (dielectric constant, k) are needed for new applications, particularly in integrated circuits (ICs) using the 32 nm technology and in capacitors. In capacitors, high-k dielectrics are used in order to attain higher energy densities in capacitors and thus to reduce the size of capacitors themselves. In ICs manufacturing, the present drive toward smaller dimensions results in the thinning of insulating layers, accompanied by an unwanted increase of leakage currents. In order to prevent this effect, higher gate thicknesses are desired which, however, because of the necessity to keep the capacitance constant, should exhibit higher dielectric constant than the pure SiO2. Materials for ICs should be used within the current silicon technologies and, therefore, they must be able to sustain all manufacturing steps without being damaged. Suitable dielectrics are mostly transition metal oxides, e.g. ZrO2, HfO2, Al2O3, Y2O3, La2O3, Ta2O5 etc. Moreover, all materials considered must be thermodynamically stable on silicon for a long time. In case of dielectrics for capacitors, the use of multilayer ceramic chip capacitors again necessitates the use of material that can withstand sintering temperatures. The work on this topic will require experimental work in sample preparation and design, studies of the theory of high -k dielectrics and the measurement of electrical properties of developed material systems. What is available: measurement equipment for the frequency range 10-3 - 109 Hz and the helium cryostat for the temperature range 10 - 500 K.
Tutor: Liedermann Karel, doc. Ing., CSc.
The subject of the research will be dielectric properties of nanocomposites for electrical insulation. These materials are based on thermosetting resins, mostly epoxides, containing finely dispersed SiO2, TiO2, Al2O3 or WO3 microfillers and nanofillers, eventually more complex chemical formulations. The presence of nanoparticles with dimensions of some 10 - 20 nm favorably affects the withstand capability of nanocomposites to partial discharges and electrical treeing and, hence, the breakdown strength as well as the degradation resistance. This in turn brings the possibility to manufacture electrical equipment (e.g. switchgear, vacuum interrupters) with smaller dimensions and weight and improved reliability. An important issue concerning all nanocomposites is the presence of a large number of interfaces. They are to due to the presence of nanoparticles with complex shapes (neither planar nor spherical). These interfaces exhibit a low stability, which may later cause substantial changes of electrical properties in the course of ageing. One of the objectives of the proposed research would therefore be to study the behavior of nanocomposites in the course of accelerated ageing. The work on this topic will require experimental work in sample preparation and design, studies of the relation between microphysical structure and electrical properties and the measurement of electrical properties of developed material systems. Equipment currently available in the Department of Physics: measurement equipment for the frequency range 102 - 109 Hz and Janis helium cryostat CCS-400/204 for the temperature range 10 - 500 K, as well as established software for measurement control. Purchased, yet not operated are Novocontrol ALPHA-AT high-resolution high-frequency analyzer with frequency range 3 Hz - 40 MHz and Nicolet 8700 FTIR-spectrometer with wave number range 7 400 - 350 cm-1.
Cracks creation in mechanical loaded solids is accompanied by origin of electromagnetic (EME) and acoustic (AE) signals. These signals can be used for study of cracks formation evolution, their characteristics finding and their localization. EME and AE methods are usable in electrical engineering, mechanical engineering and civil engineering. The goal will be determination of cracks primary parameters and their localization in conventional materials and in modern composite materials for structural applications. Analysis of EME and AE signals origin and propagation will be performed in these materials and models will be suggested. The methodology for determination of selected primary parameters and cracks localization will be suggested and verified.
Tutor: Koktavý Pavel, prof. Ing., CSc. Ph.D.
Methods, which enable displaying the entire 3D structure of the studied object in a non-destructive way are intensively studied in many scientific and industrial branches. Presently, (computed) tomography i.e. a method that gathers 3D information by reconstruction from 2D projections is mostly employed for the practical use. The topics of the dissertation work include study, application and improvements of X-ray micro-CT techniques for material analysis.
Study plan wasn't generated yet for this year.