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Self-cleaning ability of organic photo-active layers
Těthal, Vít ; Vala, Martin (referee) ; Veselý, Michal (advisor)
In this paper, methodes of determination of singlet oxygen (decolorization methodes, luminiscence detection, reaction with anorganic compounds, electon paramagnetic resonation, detecting of singlet oxygen luminiscence, detecting of absorption in IR region) and determination of efectivity of photoactive layers (photobleaching of dye aqueous solution, photodegradation of a solid fatty deposit, photoreduction of an organic dye, photooxidation of sodium salt of terephtalic acid, degradation of 1,3-diphenylisobenzofuran (DPIBF), degradation of diketopyrrolopyrrole (DPP), degradation of acridine orange) are summarized, including principle and procedure. In experimental part, 2 of these methodes (DPIBF and DPP degradation) were chosen and tested. Reaction rate constant and conversion were measured. It was found out that DPIBF methode is quick, reliable and reproducable.
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Study of electrical and dielectric properties of thin polymer films
Miklíková, Zdeňka ; Novák, Vítězslav (referee) ; Zmeškal, Oldřich (advisor)
The thesis is focused on the study of electric and dielectric properties of thin-film organic materials that can be used as an active layer of photovoltaic cells. Primarily were studied the properties of the layers on the glass substrate, which consist of a thin active layer of mixture ZnPc/PCBM with Al or Au contact. On the selected samples were first measured current-voltage characteristics in the dark and during the exposure then on the selected samples were measured frequency dependences (impedance spectra) in the dark and finally on the selected samples were measured relaxation characteristics (transient response analysis – current dependences on time at constant voltage) in the dark. The measured data for transient measurement were evaluated using the methods of fractal analysis in HarFA. The results will be used to optimize the properties of photovoltaic cells.
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Self-cleaning ability of organic photo-active layers
Těthal, Vít ; Vala, Martin (referee) ; Veselý, Michal (advisor)
In this paper, methodes of determination of singlet oxygen (decolorization methodes, luminiscence detection, reaction with anorganic compounds, electon paramagnetic resonation, detecting of singlet oxygen luminiscence, detecting of absorption in IR region) and determination of efectivity of photoactive layers (photobleaching of dye aqueous solution, photodegradation of a solid fatty deposit, photoreduction of an organic dye, photooxidation of sodium salt of terephtalic acid, degradation of 1,3-diphenylisobenzofuran (DPIBF), degradation of diketopyrrolopyrrole (DPP), degradation of acridine orange) are summarized, including principle and procedure. In experimental part, 2 of these methodes (DPIBF and DPP degradation) were chosen and tested. Reaction rate constant and conversion were measured. It was found out that DPIBF methode is quick, reliable and reproducable.
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Design and characterization of advanced polymer-coated upconversion nanoparticles
Kostiv, Uliana ; Horák, Daniel (advisor) ; Kaman, Ondřej (referee) ; Brožek, Jiří (referee)
Lanthanide-based upconversion nanoparticles are able to absorb low-energy near-infrared (NIR) photons and emit visible or ultraviolet light. This unique optical property enables luminescent detection without autofluorescence from biological samples that is crucial for bioimaging and diagnostics. Moreover, NIR irradiation allows to deliver light deep into the tissue, which can be used for drug or gene delivery and NIR-induced photodynamic therapy (PDT) of tumors. Despite huge effort during the last 10 years devoted to the upconversion nanoparticle synthesis and their surface engineering, preparation of the particles suitable for biomedical applications still remains a big challenge. The current work is focused on synthesis of the upconversion nanoparticles with controllable morphology, size, distribution, crystallinity, and high upconversion efficiency, as well as on desirable surface modification by biocompatible inorganic or organic polymers. Neat and functionalized homogeneous silica shell was introduced on the NaYF4:Yb3+ /Er3+ and NaGdF4:Yb3+ /Er3+ nanoparticles to enhance their biocompatibility and colloidal stability in water. To render the nanoparticles with targeting moieties, their surface was decorated with cell-adhesive RGD or cell-penetrating TAT peptides. The RGD- and TAT- conjugated...
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Study of electrical and dielectric properties of thin polymer films
Miklíková, Zdeňka ; Novák, Vítězslav (referee) ; Zmeškal, Oldřich (advisor)
The thesis is focused on the study of electric and dielectric properties of thin-film organic materials that can be used as an active layer of photovoltaic cells. Primarily were studied the properties of the layers on the glass substrate, which consist of a thin active layer of mixture ZnPc/PCBM with Al or Au contact. On the selected samples were first measured current-voltage characteristics in the dark and during the exposure then on the selected samples were measured frequency dependences (impedance spectra) in the dark and finally on the selected samples were measured relaxation characteristics (transient response analysis – current dependences on time at constant voltage) in the dark. The measured data for transient measurement were evaluated using the methods of fractal analysis in HarFA. The results will be used to optimize the properties of photovoltaic cells.
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