The primary intention of this work was to bring information on the research, development, and construction of advanced thin film light sensitive elements. They are designed to be used for direct monitoring of the time variable with the help of preciously calibrated color change induced by irradiation in variable ranges of the light spectrum. Protection of many objects of cultural heritage includes also their protection against light. The protection would not be possible without measuring the dosage of radiance, to which every such object has been exposed. Another important application area comprises the warning of users that their exposure to the UV light upon outdoor activities has passed. It was shown that the proposed principles are ideally suited for such purposes.
- Klíčová slova
- barevná změna, fotokatalýza, dermatologické dozimetry, expoziční dozimetry, tenké světlocitlivé vrstvy,
- MeSH
- čas MeSH
- dávka záření * MeSH
- dozimetry klasifikace MeSH
- exponáty jako téma MeSH
- fotochemie MeSH
- fotometrie MeSH
- kolorimetrie MeSH
- lidé MeSH
- muzea MeSH
- sluneční spáleniny prevence a kontrola MeSH
- sluneční záření * škodlivé účinky MeSH
- slunění MeSH
- světlo škodlivé účinky MeSH
- ultrafialové záření klasifikace škodlivé účinky MeSH
- vztah dávky záření a odpovědi MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- práce podpořená grantem MeSH
A novel outline of a planar photoelectrochemical cell consisting of a semiconductor layer topped by subsequent layers of a digitated insulator and counter electrode is introduced. The use of vertically separated electrodes represents a major development in reducing the footprint (inactive areas) of planar electrochemical cells. The cells, consisting of a nanoparticular titania photoanode and a digitated, metallic cathode, were fabricated by a strictly additive process employing material printing as the exclusive deposition and patterning tool. Transparent conductive oxide-coated glass and polyethyleneterepthalate sheets were used as substrates; nanocrystalline titania dispersion bonded by a novel organosilica binder was used for the fabrication of the photoanode and gold or carbon inks for the fabrication of the digitated cathodes. Due to the digitated shaping of the cathode, photoelectrochemical response was not suffering from iR drop down to low electrolyte ionic strengths. The printed cells were used for electroassisted photocatalytic degradation experiments with aqueous solutions of coumarin. Considerable acceleration of the coumarin degradation rate compared to the plain photocatalytic mode was observed.
- MeSH
- elektrody * MeSH
- látky znečišťující vodu MeSH
- oxidace-redukce MeSH
- tiskařství MeSH
- titan chemie MeSH
- Publikační typ
- časopisecké články MeSH
A hybrid organo-silica sol was used as a binder for reinforcing of commercial titanium dioxide nanoparticles (Evonic P25) deposited on glass substrates. The organo-silica binder was prepared by the sol-gel process and mixtures of titania nanoparticles with the binder in various ratios were deposited by materials printing technique. Patterns with both positive and negative features down to 100 µm size and variable thickness were reliably printed by Fujifilm Dimatix inkjet printer. All prepared films well adhered onto substrates, however further post-printing treatment proved to be necessary in order to improve their reactivity. The influence of UV radiation as well as of thermal sintering on the final electrochemical and photocatalytic properties was investigated. A mixture containing 63 wt % of titania delivered a balanced compromise of mechanical stability, generated photocurrent density and photocatalytic activity. Although the heat treated samples yielded generally higher photocurrent, higher photocatalytic activity towards model aqueous pollutant was observed in the case of UV cured samples because of their superhydrophilic properties. While heat sintering remains the superior processing method for inorganic substrates, UV-curing provides a sound treatment option for heat sensitive ones.
- MeSH
- nanočástice chemie MeSH
- oxid křemičitý chemie MeSH
- titan chemie MeSH
- ultrafialové záření MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
Thin layers of titanium dioxide were fabricated by direct inkjet patterning of a reverse micelles sol-gel composition onto soda-lime glass plates. Several series of variable thickness samples were produced by repeated overprinting and these were further calcined at different temperatures. The resulting layers were inspected by optical and scanning electronic microscopy and their optical properties were investigated by spectroscopic ellipsometry in the range of 200-1000 nm. Thus the influence of the calcination temperature on material as well as optical properties of the patterned micellar titania was studied. The additive nature of the deposition process was demonstrated by a linear dependence of total thickness on the number of printed layers without being significantly affected by the calcination temperature. The micellar imprints structure of the titania layer resulted into significant deviation of measured optical constants from the values reported for bulk titania. The introduction of a void layer into the ellipsometric model was found necessary for this particular type of titania and enabled correct ellipsometric determination of layer thickness, well matching the thickness values from mechanical profilometry.
- MeSH
- finanční podpora výzkumu jako téma MeSH
- Publikační typ
- abstrakty MeSH
