Počet nalezených dokumentů: 567
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Correlative probe electron microscopy analysis of plasma-treated gallium-doped zinc oxide nanorods
Rutherford, D.; Remeš, Zdeněk; Mičová, J.; Ukraintsev, E.; Rezek, B.
2024 - anglický
Correlative Probe Electron Microscopy (CPEM) was used to investigate the topographical and electronic emission properties of gallium-doped zinc oxide nanorods (ZnO:Ga) after low pressure hydrogen or oxygen plasma treatment. Simultaneous secondary electron (SE) and back-scattered electron (BSE) emission information from the same nanorods enabled true correlation with the topographical information obtained by atomic force microscopy (AFM). All nanorods were analyzed in-situ on the same substrate using the same experimental parameters which allowed for accurate comparison. ZnO:Ga nanorods displayed the largest SE emission intensity as well as the greatest BSE emission intensity. Hydrogen plasma treatment reduced both SE and BSE emission intensity, whereas oxygen plasma treatment only reduced SE emission. These effects may help elucidate various optical as well as biological interactions of ZnO:Ga nanorods. Klíčová slova: correlative microscopy; SEM; AFM; ZnO nanorods; plasma treatment Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Correlative probe electron microscopy analysis of plasma-treated gallium-doped zinc oxide nanorods

Correlative Probe Electron Microscopy (CPEM) was used to investigate the topographical and electronic emission properties of gallium-doped zinc oxide nanorods (ZnO:Ga) after low pressure hydrogen or ...

Rutherford, D.; Remeš, Zdeněk; Mičová, J.; Ukraintsev, E.; Rezek, B.
Fyzikální ústav, 2024

Room temperature ethanol detection using carbon materials
Kočí, Michal
2023 - anglický
Allotropic forms of carbon, in particular graphene oxide (GO) or nanocrystalline diamond (NCD), attracted the attention of many research groups due to their unique electronic structures and extraordinary physical and chemical properties, preferable for many different applications, including sensor devices. This work focuses on responses of various sensing layers (NCD with hydrogen termination (H-NCD), graphene oxide (GO), reduced graphene oxide (rGO), thiol-functionalized graphene oxide (GO-SH) and their hybrid structures to ethanol vapor with concentrations up to 100 ppm in synthetic air at room temperature. The measured parameters of the tested sensors, especially stability, reproducibility and regeneration, are compared and critically evaluated. The high sensitivity of tested sensors achieved at room temperature makes them very promising for monitoring ethanol vapor as well as other volatile substances (e.g., isopropyl-alcohol or acetone). Klíčová slova: gas sensor; nanocrystalline diamond (NCD); graphene oxide (GO); reduced graphene oxide (rGO); thiol-functionalized graphene oxide (GO-SH) Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Room temperature ethanol detection using carbon materials

Allotropic forms of carbon, in particular graphene oxide (GO) or nanocrystalline diamond (NCD), attracted the attention of many research groups due to their unique electronic structures and ...

Kočí, Michal
Fyzikální ústav, 2023

Effect of spin coating on electrical properties of MXene films deposited from non-aqueous solvents
Gutsul, O.; Szabó, Ondrej; Pfeifer, R.; Sasitharan, K.; Jackivová, Rajisa; Slobodyan, V.; Kromka, Alexander; Rezek, B.
2023 - anglický
We investigated the effect of spin coating parameters on the electrical properties of Ti3C2 MXene thin films deposited from non-aqueous suspensions in N,N-dimethyl formamide (DMF) and N-methyl-2-pyrrolidone (NMP) on gold interdigitated electrodes (IDE). The electrical properties of DMF-MXenes and NMP-MXenes films are characterized by impedance spectroscopy (4 Hz - 8 MHz at 1 V) using gold IDE with 25 µm gap. The electrical conductivity of MXene films decreases with increasing spin coating speed from 300 to 900 rpm. The series resistance (Rs) and double layer capacitance remain similar (Cdl). In all cases, MXenes deposited from DMF have five orders of magnitude higher electrical conductivity (lower Rct) than MXene films deposited from NMP. It is correlated with the thin film morphology obtained by scanning electron microscopy (SEM). These findings can be useful for possible application of MXenes as charge transport layers in hybrid photovoltaic devices. Klíčová slova: MXene; thin films; impedance spectroscopy; electrical conductivity; spin coating Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Effect of spin coating on electrical properties of MXene films deposited from non-aqueous solvents

We investigated the effect of spin coating parameters on the electrical properties of Ti3C2 MXene thin films deposited from non-aqueous suspensions in N,N-dimethyl formamide (DMF) and ...

Gutsul, O.; Szabó, Ondrej; Pfeifer, R.; Sasitharan, K.; Jackivová, Rajisa; Slobodyan, V.; Kromka, Alexander; Rezek, B.
Fyzikální ústav, 2023

Enhanced growth rate of diamond films at low temperature in focused microwave plasma system
Babčenko, Oleg; Bydžovská, Irena; Fait, Jan; Shagieva, Ekaterina; Ondič, Lukáš; Kromka, Alexander
2023 - anglický
The low temperature (< 500 °C) diamond film deposition on fused silica in two different focused microwave plasma systems, i.e. a multimode clamshell cavity (MCC) and a rotational ellipsoid cavity (REC) reactor, was investigated. During the experiments, the methane to hydrogen ratio, in the hydrogen-rich process gas mixture, varied from 1 % to 15 % for MCC and from 1 % to 9 % for REC. The grown films were analyzed by scanning electron microscopy and Raman shift measurements. The outcomes of the study and enhanced diamond growth at low temperatures is advantageous for overcoating of fused silica as well as thermally sensitive substrates, e.g. optical elements, photonic crystals, sensors, etc. Klíčová slova: well-faceted diamonds; low temperature deposition; high growth rate; low non-diamond content; focused plasma Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Enhanced growth rate of diamond films at low temperature in focused microwave plasma system

The low temperature (...

Babčenko, Oleg; Bydžovská, Irena; Fait, Jan; Shagieva, Ekaterina; Ondič, Lukáš; Kromka, Alexander
Fyzikální ústav, 2023

Technological challenges in the fabrication of MoS.sub.2./sub./diamond heterostructures
Varga, Marián; Sojková, M.; Hrdá, J.; Hutar, P.; Parsa Saeb, S.; Vanko, G.; Pribusova Slusna, L.; Ondič, Lukáš; Fait, Jan; Kromka, Alexander; Hulman, M.
2023 - anglický
Nowadays, 2D materials are one of the most studied classes of materials. In addition to the most famous graphene, progress has been achieved in studying and using fundamental properties of transition metal dichalcogenides (TMD). Complementary, diamond as a representative of 3D materials has gained a reputation as an extremely versatile material due to its extraordinary combination of physical/chemical/electrical/optical properties. Besides these particular forms of 2D and 3D materials, their heterostructures have become very attractive due to new phenomena and functions (bandgap engineering, enhanced charge transport, optical interaction, etc.). However, individual technological procedures are still minimally investigated and described. Here, we will demonstrate a proof-of-concept for the preparation of MoS2/diamond heterostructures, where two different strategies were employed: a) growth of MoS2 layers on diamond films, and b) growth of diamond films on Si/MoS2 substrates. Klíčová slova: transition metal dichalcogenides; molybdenum disulfide; diamond; heterostructures Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Technological challenges in the fabrication of MoS.sub.2./sub./diamond heterostructures

Nowadays, 2D materials are one of the most studied classes of materials. In addition to the most famous graphene, progress has been achieved in studying and using fundamental properties of transition ...

Varga, Marián; Sojková, M.; Hrdá, J.; Hutar, P.; Parsa Saeb, S.; Vanko, G.; Pribusova Slusna, L.; Ondič, Lukáš; Fait, Jan; Kromka, Alexander; Hulman, M.
Fyzikální ústav, 2023

Photo-active liquid crystalline materials: effect of lateral substitution far from the chiral center
Mironov, Sergei; Suchánek, T.; Marhoul, J.; Cigl, Martin; Hamplová, Věra; Bubnov, Alexej
2023 - anglický
Photosensitive liquid crystalline (LC) materials give a fascinating possibility to tune and control the optical properties of soft systems distantly by illumination by UV-Vis light. Lateral substitution on the molecular core is an effective tool to tune the behaviour of chiral LCs. The effect of lateral substitution (by F, Cl, Br and methyl group) on the self-assembling behaviour, several new LCs with substituents placed on the benzene ring far from the chiral centre are and studied. All compounds, with exception of Br-substituted one, possess the cholesteric phase. The photosensitive behaviour, in particular the conversion of the E-Z isomers, was studied in toluene solution by HPLC. The kinetics of the photo-isomerization was identified under illumination by UV light. Due to presence of a photo-active azo group these materials can be used as functional dopants for design of smart photo-active liquid crystalline mixtures targeted for various applications in optoelectronics. Klíčová slova: photosensitive chiral liquid crystal; lateral substitution; azobenzene; E-Z isomerization Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Photo-active liquid crystalline materials: effect of lateral substitution far from the chiral center

Photosensitive liquid crystalline (LC) materials give a fascinating possibility to tune and control the optical properties of soft systems distantly by illumination by UV-Vis light. Lateral ...

Mironov, Sergei; Suchánek, T.; Marhoul, J.; Cigl, Martin; Hamplová, Věra; Bubnov, Alexej
Fyzikální ústav, 2023

CERTIFIKOVANÁ METODIKA, Metodika pro maloobjemovou sterilizaci násadových vajec
Bezděk, D.; Dejneka, Alexandr; Kubinová, Šárka; Fejt, T.; Churpita, Olexandr; Drahošová, Michala
2022 - český
Metodika je výsledkem řešení výzkumného projektu č. TH04030206 s názvem: Výzkum využití fyzikálních metod sterilizace vajec pro líhnění. Cílem projektu je rozvoj fyzikálních metod sterilizace násadových vajec - zejm. rozvoj metody nízkoteplotního plazmatu (NTP). Metoda NTP je nasazena se záměrem zvýšit efektivitu drůbežího chovu a výrazně snížit zdravotní a ekologickou zátěž. Zvýšením přidané hodnoty a efektivity chovu dále projekt přispívá ke konkurenceschopnosti drůbežářského průmyslu a tím i k potravinové soběstačnosti ČR. The methodology is the result of the solution of the research project No. TH04030206 entitled: Develoment of methods of physical sterilization of hatching eggs. The project is focused on a hatching egg sterilization based on physical methods - namely low temperature plasma (LTP). Compared to the existing methods, LTP should result in an increased efficiency of poultry farming and eliminated health and ecological risks. The higher added value and efficiency further contribute to higher competitiveness of the poultry industry and food self-sufficiency of the Czech Republic. Klíčová slova: physical methods; sterilization of eggs for hatching; low-temperature plasma Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
CERTIFIKOVANÁ METODIKA, Metodika pro maloobjemovou sterilizaci násadových vajec

Metodika je výsledkem řešení výzkumného projektu č. TH04030206 s názvem: Výzkum využití fyzikálních metod sterilizace vajec pro líhnění. Cílem projektu je rozvoj fyzikálních metod sterilizace ...

Bezděk, D.; Dejneka, Alexandr; Kubinová, Šárka; Fejt, T.; Churpita, Olexandr; Drahošová, Michala
Fyzikální ústav, 2022

Termická analýza vstupních surovin pro růst krystalů vysokoteplotních komplexních oxidů
Zemenová, Petra; Král, Robert; Falvey, Alexandra; Pejchal, Jan; Bystřický, Aleš
2022 - český
Příspěvek se zabývá studiem tepelného chování oxidů vzácných zemin (La2O3, Sc2O3 a Gd2O3), které se používají jako výchozí suroviny při přípravě krystalů komplexních oxidů na bázi granátů a perovskitů, pomocí metod DSC-TG-MS. This contribution deals with the study of thermal behavior of oxide La2O3, Sc2O3 a Gd2O3 by methods DSC-TG-MS. Klíčová slova: thermal analysis DSC-TG; mass spectrometry; oxide; high-temperature complex oxides crystals Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Termická analýza vstupních surovin pro růst krystalů vysokoteplotních komplexních oxidů

Příspěvek se zabývá studiem tepelného chování oxidů vzácných zemin (La2O3, Sc2O3 a Gd2O3), které se používají jako výchozí suroviny při přípravě krystalů komplexních oxidů na bázi granátů a ...

Zemenová, Petra; Král, Robert; Falvey, Alexandra; Pejchal, Jan; Bystřický, Aleš
Fyzikální ústav, 2022

XXIV Czech-Polish seminar: Structural and ferroelectric phase transitions: Book of abstracts and program
Pokorný, Jan; Bubnov, Alexej; Janovská, Marie
2022 - anglický
This is the Book of Abstracts for the XXIV Czech-Polish Seminar (CPSEM-2022 conference) held in Harrachov (Czech Republic) on May 23 - 27, 2022. The special objective of the conference is expressed in the conference subtitle: Structural and Ferroelectric Phase Transitions. The continuous worldwide interest to this conference series is proving that it has a respected position within the series of International/European conferences covering all interdisciplinary field of the research related to structural and ferroelectric phase transitions. At the CPSEM-2022 conference there were about 100 participants from 10 countries delivered 8 tutorial lectures for early stage researchers, 8 invited lectures and selected 34 oral contributions. More than 55 posters were presented during two poster sessions. Klíčová slova: Czech-Polish seminar; structural and ferroelectric phase transition Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
XXIV Czech-Polish seminar: Structural and ferroelectric phase transitions: Book of abstracts and program

This is the Book of Abstracts for the XXIV Czech-Polish Seminar (CPSEM-2022 conference) held in Harrachov (Czech Republic) on May 23 - 27, 2022. The special objective of the conference is expressed in ...

Pokorný, Jan; Bubnov, Alexej; Janovská, Marie
Fyzikální ústav, 2022

Vliv velikosti zrn práškového NaCl na jeho termické vlastnosti
Falvey, Alexandra; Zemenová, Petra; Vaněček, Vojtěch; Bystřický, Aleš; Stehlík, Štěpán; Král, Robert
2022 - český
Příspěvek se zabývá studiem tepelného chování vzorku NaCl v práškové formě (s homogenní a nehomogenní distribucí zrn, různou vlhkostí) a monokrystalického NaCl metodami termické analýzy (DSC a TMA) a hmotnostní spektrometrii (MS). The paper deals with the study of the thermal behavior of a sample of NaCl in powder form (with homogeneous and inhomogeneous grain distribution, different humidity) and monocrystalline NaCl using the methods of thermal analysis (DSC and TMA) and mass spectrometry (MS). Klíčová slova: thermal analysis Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Vliv velikosti zrn práškového NaCl na jeho termické vlastnosti

Příspěvek se zabývá studiem tepelného chování vzorku NaCl v práškové formě (s homogenní a nehomogenní distribucí zrn, různou vlhkostí) a monokrystalického NaCl metodami termické analýzy (DSC a TMA) a ...

Falvey, Alexandra; Zemenová, Petra; Vaněček, Vojtěch; Bystřický, Aleš; Stehlík, Štěpán; Král, Robert
Fyzikální ústav, 2022

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