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Number of found documents:
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Room temperature ethanol detection using carbon materials
Kočí, Michal
2023 - English
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).
Keywords:
gas sensor; nanocrystalline diamond (NCD); graphene oxide (GO); reduced graphene oxide (rGO); thiol-functionalized graphene oxide (GO-SH)
Available at various institutes of the ASCR
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 ...
Book of abstracts of the 1st outdoor seminar of the Department of Optical Materials: Advances in the new materials engineering and study
Buryi, Maksym; Král, Robert
2023 - English
The seminar is dedicated to the main activities of the department of Optical Materials, FZU - Institute of Physics of the Czech Academy of Sciences in the course of national and international collaborations. In particular, the advanced methods of the (nano)materials synthesis, fabrication, and characterization are presented and discussed in detail. The aim of the seminar is to establish more of the effective paths of communication and data exchange by creating and maintaining links among the teams of national and international experts in various fields of physical and chemical knowledge, both experimental and theoretical.
Keywords:
nanomaterials; synthesis; data exchange
Fulltext is available at external website.
Book of abstracts of the 1st outdoor seminar of the Department of Optical Materials: Advances in the new materials engineering and study
The seminar is dedicated to the main activities of the department of Optical Materials, FZU - Institute of Physics of the Czech Academy of Sciences in the course of national and international ...
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 - English
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.
Keywords:
well-faceted diamonds; low temperature deposition; high growth rate; low non-diamond content; focused plasma
Available at various institutes of the ASCR
Enhanced growth rate of diamond films at low temperature in focused microwave plasma system
The low temperature (...
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 - English
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.
Keywords:
transition metal dichalcogenides; molybdenum disulfide; diamond; heterostructures
Available at various institutes of the ASCR
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 ...
Book of Abstracts of the 32st Joint Seminar Development of Materials Science in Research and Education (DMSRE)
Kožíšek, Zdeněk; Král, Robert; Zemenová, Petra
2023 - English
Conference topics. Trends in the development of materials research. Information about the research programs of individual institutions. Results of materials research. Education of materials science at the universities. Information about equipment for preparation and characterization of materials.\n
Keywords:
material sciences
Fulltext is available at external website.
Book of Abstracts of the 32st Joint Seminar Development of Materials Science in Research and Education (DMSRE)
Conference topics. Trends in the development of materials research. Information about the research programs of individual institutions. Results of materials research. Education of materials science ...
CERTIFIKOVANÁ METODIKA, Metodika pro maloobjemovou sterilizaci násadových vajec
Bezděk, D.; Dejneka, Alexandr; Kubinová, Šárka; Fejt, T.; Churpita, Olexandr; Drahošová, Michala
2022 - Czech
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.
Keywords:
physical methods; sterilization of eggs for hatching; low-temperature plasma
Available at various institutes of the ASCR
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 ...
Termická analýza vstupních surovin pro růst krystalů vysokoteplotních komplexních oxidů
Zemenová, Petra; Král, Robert; Falvey, Alexandra; Pejchal, Jan; Bystřický, Aleš
2022 - Czech
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.
Keywords:
thermal analysis DSC-TG; mass spectrometry; oxide; high-temperature complex oxides crystals
Available at various institutes of the ASCR
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 ...
XXIV Czech-Polish seminar: Structural and ferroelectric phase transitions: Book of abstracts and program
Pokorný, Jan; Bubnov, Alexej; Janovská, Marie
2022 - English
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.
Keywords:
Czech-Polish seminar; structural and ferroelectric phase transition
Available at various institutes of the ASCR
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 ...
Vliv velikosti zrn práškového NaCl na jeho termické vlastnosti
Falvey, Alexandra; Zemenová, Petra; Vaněček, Vojtěch; Bystřický, Aleš; Stehlík, Štěpán; Král, Robert
2022 - Czech
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).
Keywords:
thermal analysis
Available at various institutes of the ASCR
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 ...
Magnetocrystalline anisotropy of Ni-Mn-Ga-Co-Cu martensite
Rameš, Michal; Straka, Ladislav; Sozinov, A.; Heczko, Oleg
2022 - English
The martensites of Heusler alloys based on Ni-Mn-Ga exhibit magnetically-induced reorientation resulting in giant field-induced strain. Up to 12% strain was observed in Ni-Mn-Ga-Co-Cu with 4 at.% of Co and Cu. The driving force of the phenomenon is the magnetocrystalline anisotropy. We studied evolution of the anisotropy with temperature and compositions using magnetiyation curve measurements in four different single crystalline Ni-Mn-Ga-Co-Cu and compared with non-doped Ni-Mn-Ga. The anisotropy of martensite decreases with increasing average doping (Co+Cu)/2 but it does not scale with tetragonal ratio or valence electron concentration.
Keywords:
martensite; magnetocrystalline anisotropy; Heusler alloys; Ni-Mn-Ga
Available at various institutes of the ASCR
Magnetocrystalline anisotropy of Ni-Mn-Ga-Co-Cu martensite
The martensites of Heusler alloys based on Ni-Mn-Ga exhibit magnetically-induced reorientation resulting in giant field-induced strain. Up to 12% strain was observed in Ni-Mn-Ga-Co-Cu with 4 at.% of ...
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