Готові списки джерел за темами / 2D oxides

Добірка наукової літератури з теми "2D oxides"

Автор: Grafiati

Опубліковано: 8 червня 2024

Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями

Оберіть тип джерела:

Ознайомтеся зі списками актуальних статей, книг, дисертацій, тез та інших наукових джерел на тему "2D oxides".

Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.

Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.

Статті в журналах з теми "2D oxides":

Zhou, Yu, Jun Zhu, Dongyu Cai, and Yingchun Cheng. "The Possibility of Layered Non-Van Der Waals Boron Group Oxides: A First-Principles Perspective." Crystals 13, no. 9 (August 23, 2023): 1298. http://dx.doi.org/10.3390/cryst13091298.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Two-dimensional (2D) metal oxides have broad prospective applications in the fields of catalysis, electronic devices, sensors, and detectors. However, non-van der Waals 2D metal oxides have rarely been studied because they are hard to peel off or synthesize. In this work, taking alumina (Al2O3) as a typical representative of 2D boron group oxides, the structural stability and electrical properties of 2D Al2O3 are investigated through first-principles calculations. The thinnest Al2O3 structure is a bilayer, and the band gap of Al2O3 is found to decrease with decreasing layer thickness because of the giant surface reconstruction. The band gap of bilayer X2O3 (X = Al, Ga, and In) decreases with increasing atomic radius. Our findings provide theoretical support for the preparation of non-van der Waals 2D boron group oxide semiconductors.

Förster, Stefan, Eva Zollner, Klaus Meinel, Renè Hammer, Martin Trautmann, and Wolf Widdra. "2D quasicrystals from perovskites." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C80. http://dx.doi.org/10.1107/s2053273314099197.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Perovskite oxides represent a versatile class of materials with a simple cubic or pseudo-cubic crystal structure. The family of perovskite oxides contains insulators, metals, semiconductors, and superconductors with nearly identical lattice parameters. This structural equivalence additionally allows to combine perovskites with different properties in multilayer systems to produce functional materials with unique properties. We report here on the formation of a quasicrystal (QC) thin film on a threefold Pt(111) surface. This QC film is derived from the classical perovskite oxide BaTiO3 which is the most intensely studied ferroelectric perovskite oxide. An easily accessible ferroelectric to paraelectric phase transition at 400 K makes the material so interesting for basic and applied research. Due to matching lattice conditions BaTiO3 can be grown epitaxially on selected metal substrates. Periodic thin films of either BaTiO3(100) or BaTiO3(111) have been grown depending on substrate orientation and preparation conditions on Pt(001) and on Pt(111) [1, 2]. As we demonstrate here, astonishingly also a two-dimensional dodecagonal quasicrystalline structure can be formed by annealing an initially 1.4 nm thick BaTiO3 film on Pt(111) [3]. It develops at a temperature of 1250 K from a wetting layer spreading between a few thicker BaTiO3(111) islands. Surface sensitive electron diffraction (LEED) shows a bright and sharp pattern with dodecagonal symmetry. High-resolution scanning tunneling microscopy (STM) images reveal an arrangement of quadratic, triangular, and rhombic elements which compares well to a Gähler tiling. The development of higher-order self-similar structures is widely suppressed by a linear phason strain. This is supported by the fine structure of the diffraction data.

Li, Tao, Wen Yin, Shouwu Gao, Yaning Sun, Peilong Xu, Shaohua Wu, Hao Kong, Guozheng Yang, and Gang Wei. "The Combination of Two-Dimensional Nanomaterials with Metal Oxide Nanoparticles for Gas Sensors: A Review." Nanomaterials 12, no. 6 (March 16, 2022): 982. http://dx.doi.org/10.3390/nano12060982.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Metal oxide nanoparticles have been widely utilized for the fabrication of functional gas sensors to determine various flammable, explosive, toxic, and harmful gases due to their advantages of low cost, fast response, and high sensitivity. However, metal oxide-based gas sensors reveal the shortcomings of high operating temperature, high power requirement, and low selectivity, which limited their rapid development in the fabrication of high-performance gas sensors. The combination of metal oxides with two-dimensional (2D) nanomaterials to construct a heterostructure can hybridize the advantages of each other and overcome their respective shortcomings, thereby improving the sensing performance of the fabricated gas sensors. In this review, we present recent advances in the fabrication of metal oxide-, 2D nanomaterials-, as well as 2D material/metal oxide composite-based gas sensors with highly sensitive and selective functions. To achieve this aim, we firstly introduce the working principles of various gas sensors, and then discuss the factors that could affect the sensitivity of gas sensors. After that, a lot of cases on the fabrication of gas sensors by using metal oxides, 2D materials, and 2D material/metal oxide composites are demonstrated. Finally, we summarize the current development and discuss potential research directions in this promising topic. We believe in this work is helpful for the readers in multidiscipline research fields like materials science, nanotechnology, chemical engineering, environmental science, and other related aspects.

Elmacı, Gökhan, Carolin E. Frey, Philipp Kurz, and Birgül Zümreoğlu-Karan. "Water oxidation catalysis by using nano-manganese ferrite supported 1D-(tunnelled), 2D-(layered) and 3D-(spinel) manganese oxides." Journal of Materials Chemistry A 4, no. 22 (2016): 8812–21. http://dx.doi.org/10.1039/c6ta00593d.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Hu, Xiaozong, Kailang Liu, Yongqing Cai, Shuang-Quan Zang, and Tianyou Zhai. "2D Oxides for Electronics and Optoelectronics." Small Science 2, no. 8 (August 2022): 2270016. http://dx.doi.org/10.1002/smsc.202270016.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Zhou, Wenhan, Shengli Zhang, and Haibo Zeng. "Perovskite oxides as a 2D dielectric." Nature Electronics 5, no. 4 (April 2022): 199–200. http://dx.doi.org/10.1038/s41928-022-00757-3.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Parkinson, Gareth S. "Adding oxides to the 2D toolkit." Nature Materials 20, no. 8 (July 28, 2021): 1041–42. http://dx.doi.org/10.1038/s41563-021-01048-6.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Lu, Yihua, and Xi Zhu. "Superbound Excitons in 2D Phosphorene Oxides." Journal of Physical Chemistry A 123, no. 1 (December 6, 2018): 21–25. http://dx.doi.org/10.1021/acs.jpca.8b09683.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Zhang, Handing, Haoyu Zhang, Ruijing Wang, Jiayu Lv, Wugen Huang, Chenyan Guo, and Fan Yang. "Enhancing Oxygen Evolution Reaction with Two-Dimensional Nickel Oxide on Au (111)." Catalysts 14, no. 5 (April 23, 2024): 284. http://dx.doi.org/10.3390/catal14050284.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

The nature of the active sites of transition metal oxides during the oxygen evolution reaction (OER) has attracted much attention. Herein, we constructed well-defined nickel oxide/Au (111) model catalysts to study the relationship between the structures and their OER activity using scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS), electrochemical measurements, and density functional theory (DFT) calculations. The deposited nickel oxides on Au (111) were found to exhibit a two-dimensional (2D)/three-dimensional (3D) structure by regulating the annealing temperature. Combining STM, XPS and electrochemical measurements, our results demonstrated an optimal OER reactivity could be achieved for NiOx with a 2D structure on Au and provided a morphological description of the active phase during electrocatalysis.

Nikolic, Maria Vesna, Vladimir Milovanovic, Zorka Z. Vasiljevic, and Zoran Stamenkovic. "Semiconductor Gas Sensors: Materials, Technology, Design, and Application." Sensors 20, no. 22 (November 23, 2020): 6694. http://dx.doi.org/10.3390/s20226694.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

This paper presents an overview of semiconductor materials used in gas sensors, their technology, design, and application. Semiconductor materials include metal oxides, conducting polymers, carbon nanotubes, and 2D materials. Metal oxides are most often the first choice due to their ease of fabrication, low cost, high sensitivity, and stability. Some of their disadvantages are low selectivity and high operating temperature. Conducting polymers have the advantage of a low operating temperature and can detect many organic vapors. They are flexible but affected by humidity. Carbon nanotubes are chemically and mechanically stable and are sensitive towards NO and NH3, but need dopants or modifications to sense other gases. Graphene, transition metal chalcogenides, boron nitride, transition metal carbides/nitrides, metal organic frameworks, and metal oxide nanosheets as 2D materials represent gas-sensing materials of the future, especially in medical devices, such as breath sensing. This overview covers the most used semiconducting materials in gas sensing, their synthesis methods and morphology, especially oxide nanostructures, heterostructures, and 2D materials, as well as sensor technology and design, application in advance electronic circuits and systems, and research challenges from the perspective of emerging technologies.

Більше джерел

Дисертації з теми "2D oxides":

SCALISE, EMILIO. "Vibrational Properties of Defective Oxides and 2D Nanolattices." Doctoral thesis, KuLeuven, 2013. http://hdl.handle.net/10281/181816.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

The nanoelectronic evolution, which was driven for many years by the ‘‘aggressive scaling’’ of the complementary metal-oxide-semiconductor (CMOS) devices, needs new approaches in order to face the demands for smaller, more performing, and less power-consuming integrated circuits. A few years ago, high-mobility semiconductors, e.g., germanium and III–V semiconductors, started to be investigated as possible substitutes of silicon as materials for the CMOS channel. On the other hand, dielectric materials with a higher dielectric constant (j) than the native silicon dioxide, such as HfO2, were introduced into CMOS devices a couple of years ago, in order to obtain a larger oxide capacitance, improving the performance of the devices while keeping their power consumption as low as possible. To take effective advantage of the introduction of high-mobility semiconductors and high-j dielectrics in the next generations of CMOS devices, high quality interfaces are required. In the first part of this thesis, we investigate the vibrational properties of defective HfO2 by first-principles simulations, and we compare them with experimental results from inelastic electron tunneling spectroscopy (IETS). This spectroscopic technique is very powerful for the investigation of nanoscale junctions. We also model amorphous defective GeO2, likely present at the interface of Ge/HfO2 gate stacks. Different defects, including three-folded oxygen atoms and divalent germanium centers are investigated. We show how the calculated vibrational spectra of the defective oxides, correlated to IETS measurements, can be successfully used for the investigation of high-mobility/high-j gate stacks interfaces. Recently, the interest of the physics and electronic engineering community in 2D materials, such as graphene, increased exponentially. These materials, made up of one single atomic layer, can be used to exploit quantum confinement effects, resulting in unique electronic and magnetic properties. The linear electronic dispersion observed in graphene, linked to the presence of massless Dirac fermions, was recently predicted also for its silicon and germanium counterparts, the so-called silicene and germane. This is very appealing for nanoelectronic and energy applications, in which materials with an extremely high conductivity are highly demanded. Recent experiments showed that silicene grown on metallic substrates has different structural configurations and presents a characteristic puckering of the silicon atoms, which are in contrast to graphene.In the second part of this thesis, the structural and vibrational properties of silicene on Ag(111) surfaces are calculated. Their comparison with experimental measurements, such as scanning tunneling microscopy and Raman spectroscopy, allows us to investigate the structural but also the electronic properties of different silicene reconstructions on Ag(111). Finally, the possible growth of silicene on nonmetallic templates is theoretically investigated. We show that different layered chalcogenide compounds (i.e., MoX2 and GaX, X=S, Se, Te) can be used as templates for the silicene layer. The van der Waals interaction between the silicene layer and the templates is important for avoiding strong interactions (hybridization) between the silicon atoms and the substrates. The different in-plane lattice parameters of the chalcogenide compounds can be exploited to tune the electronic properties of the silicene layer, preserving in some cases its massless Dirac fermions.

Odziomek, Mateusz Janusz. "Colloidal Synthesis and Controlled 2D/3D Assemblies of Oxide Nanoparticles." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEN092/document.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

La nanotechnologie est devenue un domaine clé de la technologie du XXIe siècle. L’important développement des approches pour la synthèse des nanoparticules (NPs) avec une composition, une taille et une forme désirées rend compte du potentiel de leur utilisation comme « blocs de construction » pour des structures de plus grande échelle. Cela permet d’envisager à la fois la fabrication de matériaux fonctionnels et de dispositifs directement à partir de colloïdes par approche ascendante et la conception de matériaux sur plusieurs échelles de grandeur. Le procédé utilise l'assemblage ou l'auto-assemblage de NPs et conduit à des matériaux avec des architectures différentes notamment 1D (bâtonnets), 2D (films) ou 3D (super-réseaux ou gels). Cependant, la plupart des assemblages 3D sont limités à l'échelle micrométrique et sont difficiles à contrôler. Pratiquement, la seule voie permettant la préparation de structures 3D macroscopiques à partir de NPs est la gélification et la préparation d'aérogels. Une voie alternative consiste à disperser les NPs dans une matrice, conduisant ainsi à un matériau composite massif, avec des NPs non agrégées distribuées de manière homogène.Le présent travail est consacré au développement de matériaux à partir de NPs d'oxydes métalliques (principalement Y3Al5O12: Ce et Li4Ti5O12) de différentes dimensions et pour diverses applications. La première partie de ce travail décrit la synthèse de NPs de YAG: Ce et de LTO par approche glycothermale. Dans le cas du YAG: Ce, les conditions de réaction ont été ajustées de façon appropriée pour obtenir des nanocristaux (NCs) non agrégés de quelques nanomètres. Des solutions colloïdales de différentes concentrations contenant de tels NCs ont été utilisées, pour la fabrication par la technique de « spin-coating », de films minces avec une épaisseur contrôlable. A l’inverse, la synthèse de LTO conduit à des NPs agrégées dans une structure hiérarchique très bénéfique pour les batteries au lithium. La grande surface spécifique et la porosité du matériau obtenu assurent en effet un échange efficace des ions lithium entre l'électrolyte et le matériau d'anode.Par ailleurs, les NCs de YAG: Ce ont été utilisés pour la préparation de matériaux monolithiques de grande taille avec une porosité et une transparence élevées. Pour cela, la solution colloïdale de NCs a été gélifiée par le changement brusque de la constante diélectrique du solvant de dispersion des NCs. Les gels ainsi obtenus ont été par la suite séchés de manière supercritique, donnant ainsi des aérogels à base de NPs de YAG:Ce, avec une porosité et une transparence élevées. La même approche s'est avérée appropriée pour d'autres systèmes à base de NPs de GdF3 ou de mélanges de NPS de YAG: Ce et de GdF3.Alternativement, les NPs de YAG: Ce ont été incorporées dans des aérogels de silice formant ainsi des aérogels macroscopiques robustes et hautement transparents présentant les propriétés des NPs incorporées. Ces aérogels composites ont été utilisés en tant que nouveaux types de capteurs pour les rayonnements ionisants de basse énergie dans les liquides ou les gaz. Leur porosité élevée permet un contact optimal entre l'émetteur radioactif et le scintillateur assurant ainsi une bonne récupération de l'énergie radioactive
Nanotechnology has become a key domain of technology in XXI century. The great development of the synthetic approaches toward nanoparticles (NPs) with desired composition, size and shape expose the potential of their use as building blocks for larger scale structures. It allows fabrication of functional materials and devices directly from colloids by bottom-up approach, thus involving possibility of material design over several length scales. The process is referred to NPs assembly or self-assembly and leads to materials with varying architectures as for instance 1D (rods), 2D (films) or 3D (superlattices or gels). However most of 3D assemblies are limited to the micrometric scale and are difficult to control. Practically the only route allowing preparation of macroscopic 3D structures from NPs is their gelation and preparation of aerogels. As an alternative, NPs can be embedded in some matrix creating bulk composite material, with homogenously distributed non-aggregated NPs.Therefore, this work is devoted to development of materials with different dimensionalities for various applications from metal oxides NPs (mainly Y3Al5O12:Ce and Li4Ti5O12). The first part describes the syntheses of YAG:Ce and LTO NPs by glycothermal approach. In the case of YAG:Ce, the reactions conditions were appropriately adjusted in order to obtain non-aggregated nanocrystals (NCs) of few nanometers. The colloidal solution containing such NCs with different concentration was used for fabrication of thin films with controllable thickness by spin-coating method. Contrary, the synthesis of LTO led to aggregated NPs with hierarchical structuration which was highly beneficial for Li-ion batteries. The large surface area and porosity ensured efficient exchange of Li ions between electrolyte and anode material. Furthermore, the YAG:Ce NCs were used for preparation of macroscopic monoliths with high porosity and transparency. For that reason, colloidal solution of NCs was gelled by the abrupt change of solvent dielectric constant. The gels were further supercritically dried yielding YAG:Ce NPs-based aerogels with high porosity and transparency. The same approach turned o be appropriate for other systems like GdF3 or hybrid aerogels of YAG:Ce and GdF3.Alternatively, YAG:Ce NPs were incorporated into silica aerogels forming robust macroscopic and highly transparent aerogels exhibiting properties of incorporated NPs. They served for novel type of sensors for low-energy ionizing radiation in liquids and gases. Their high porosity assured well-developed contact between radioactive emitter and the scintillator ensuring good harvesting of radioactive energy

Paerschke, Ekaterina. "Interplay of Strong Correlation, Spin-Orbit Coupling and Electron-Phonon Interactions in Quasi-2D Iridium Oxides." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-235245.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

In the last decade, a large number of studies have been devoted to the peculiarities of correlated physics found in the quasi-two-dimensional square lattice iridium oxides. It was shown that this 5d family of transition metal oxides has strong structural and electronic similarities to the famous 3d family of copper oxides. Moreover, a delicate interplay of on-site spin-orbit coupling, Coulomb repulsion and crystalline electric field interactions is expected to drive various exotic quantum states. Many theoretical proposals were made in the last decade including the prediction of possible superconductivity in square-lattice iridates emerging as a sister system to high-Tc cuprates, which however met only limited experimental confirmation. One can, therefore, raise a general question: To what extent is the low-energy physics of the quasi-two-dimensional square-lattice iridium oxides different from other transition metal oxides including cuprates? In this thesis we investigate some of the effects which are usually neglected in studies on iridates, focusing on quasi-two-dimensional square-lattice iridates such as Sr2IrO4 or Ba2IrO4. In particular, we discuss the role of the electron-phonon coupling in the form of Jahn-Teller interaction, electron-hole asymmetry introduced by the strong correlations and some effects of coupling scheme chosen to calculate multiplet structure for materials with strong on-site spin-orbit coupling. Thus, firstly, we study the role of phonons, which is almost always neglected in Sr2IrO4, and discuss the manifestation of Jahn-Teller effect in the recent data obtained on Sr2IrO4 with the help of resonant inelastic x-ray scattering. When strong spin-orbit coupling removes orbital degeneracy, it would at the same time appear to render the Jahn-Teller mechanism ineffective. We show that, while the Jahn-Teller effect does indeed not affect the antiferromagnetically ordered ground state, it leads to distinctive signatures in the spin-orbit exciton. Second, we focus on charge excitations and determine the motion of a charge (hole or electron) added to the Mott insulating, antiferromagnetic ground-state of square-lattice iridates. We show that correlation effects, calculated within the self-consistent Born approximation, render the hole and electron case very different. An added electron forms a spin-polaron, which closely resembles the well-known cuprates, but the situation of a removed electron is far more complex. Many-body configurations form that can be either singlets and triplets, which strongly affects the hole motion. This not only has important ramifications for the interpretation of angle-resolved photoemission spectroscopy and inverse photoemission spectroscopy experiments of square lattice iridates, but also demonstrates that the correlation physics in electron- and hole-doped iridates is fundamentally different. We then discuss the application of this model to the calculation of scanning tunneling spectroscopy data. We show that using scanning tunneling spectroscopy one can directly probe the quasiparticle excitations in Sr2IrO4: ladder spectrum on the positive bias side and multiplet structure of the polaron on the negative bias side. We discuss in detail the ladder spectrum and show its relevance for Sr2IrO4 which is in general described by more complicated extended t-J -like model. Theoretical calculation reveals that on the negative bias side the internal degree of freedom of the charge excitation introduces strong dispersive hopping channels encaving ladder-like features. Finally, we discuss how the choice of the coupling scheme to calculate multiplet structure can affect the theoretical calculation of angle-resolved photoemission spectroscopy and scanning tunnelling spectroscopy spectral functions.

Asel, Thaddeus J. "Nanoscale Characterization of Defects in Complex Oxides and Germanane." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1523982077791833.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Treske, Uwe. "Valence changes at interfaces and surfaces investigated by X-ray spectroscopy." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-162589.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

In this thesis valence changes at interfaces and surfaces of 3d and 4f systems are investigated by X-ray spectroscopy, in particular X-ray photoemission (XPS), X-ray absorption (XAS) and resonant photoemission spectroscopy (ResPES). The first part addresses the electronic properties of the oxides LaAlO3, LaGaO3 and NdGaO3 grown by pulsed laser deposition on TiO2-terminated SrTiO3 single crystals along (001)-direction. These polar/non-polar oxide interfaces share an insulator to metal phase transition as a function of overlayer thickness including the formation of an interfacial two dimensional electron gas. The nature of the charge carriers, their concentration and spatial distribution, and the band alignment near the interface are studied in a comparative manner and evaluated quantitatively. Irrespective of the different overlayer lattice constants and bandgaps, all the heterostructures behave similarly. Rising Ti3+ concentration is monitored by Ti 2p XPS, Ti L-edge XAS and by resonantly enhanced Ti 3d excitations in the vicinity of EF (ResPES) when the layer number n increases. This indicates that the active material is in all cases a near interface SrTiO3 layer of 4nm thickness. Band bending in SrTiO3 occurs but no electric field is detected inside the polar overlayers. Essential aspects of the findings are captured by scenarios where the polar forces are alleviated by surface defect creation or the separation of photon generated electron-hole pairs in addition to the electronic reconstruction at n = 4 unit cells layer thickness. Furthermore, deviations from an abrupt interface are found by soft X-ray photoemission spectroscopy which may affect the interface properties. The surface sensitivity of the measurements has been tuned by varying photon energy and emission angle. In contrast to the core levels of the other elements, the Sr 3d line shows an unexpected splitting for higher surface sensitivity, signaling the presence of a second strontium component. From a quantitative analysis it is concluded that during the growth process a small amount of Sr atoms diffuse away from the substrate and segregate at the surface of the heterostructure, possibly forming strontium oxide. In the second part of this thesis the heavy fermion superconductors CeMIn5 (M = Co, Rh, Ir) are investigated by temperature- and angle-dependent XPS. In this material class the subtle interplay between localized Ce 4f and itinerant valence electrons dominate the electronic properties. The Ce 3d core level has a very similar shape for all three materials and is indicative of weak f-hybridization. The spectra are analyzed using a simplified version of the Anderson impurity model, which yields a Ce 4f occupancy that is larger than 0.9. The temperature dependence shows a continuous, irreversible and exclusive broadening of the Ce 3d peaks, due to oxidation of Ce at the surface
In der vorliegenden Dissertation werden Valenzänderungen an Grenzflächen und Oberflächen mittels Verfahren der Röntgenspektroskopie untersucht, zu denen die Röntgenphotoelektronen- (XPS), die Röntgenabsorptions- (XAS) und die resonante Photoelektronenspektroskopie (ResPES) gehören. Kapitel 3 behandelt die elektronischen Eigenschaften der Oxide LaAlO3, LaGaO3 und NdGaO3, welche mittels Laserdeposition (PLD) auf TiO2-terminierte SrTiO3 Einkristalle entlang (001)-Richtung gewachsen wurden. Diese polaren/nicht-polaren Oxidgrenzflächen weisen einen Isolator-Metall Phasenübergang als Funktion der Schichtdicke auf, bei dem sich ein zwei dimensionales Elektronengas an der Grenzfläche bildet. Die Eigenschaften dieser Ladungsträger, deren Konzentration und räumliche Ausdehnung, sowie der Verlauf der Energiebänder an der Grenzfläche werden vergleichend untersucht und quantitativ bestimmt. Es wird gezeigt, dass sich die drei untersuchten Grenzflächen, trotz unterschiedlicher Gitterkonstanten und Energiebandlücken, ähnlich verhalten. Das mit der Schichtdicke ansteigende Ti3+ Signal wird im Ti 2p XPS, Ti L-Kante XAS und durch die resonant verstärkten Ti 3d Anregungen nahe EF (ResPES) nachgewiesen. Daraus lässt sich schlussfolgern, dass in allen Fällen eine SrTiO3 Schicht mit einer Dicke von 4nm der eigentlich aktive Bereich ist. Im SrTiO3 tritt eine Bandverbiegung auf, ein elektrisches Feld in der polaren Deckschicht kann jedoch nicht nachgewiesen werden. Grundlegende Aspekte dieser Ergebnisse sind in einem Szenario vereinbar, bei dem die polaren Kräfte durch die Entstehung von Oberflächendefekten, durch die Trennung von photoneninduzierten Elektronen-Lochpaaren und durch eine elektronische Umordnung bei 4 uc Schichtdicke eliminiert werden. Des Weiteren werden Abweichungen von einer abrupten Grenzfläche mittels weich-Röntgenphotoelektronenspektroskopie festgestellt, die die Grenzflächeneigenschaften beeinflussen können. Für oberflächenempfindlichere Messbedingungen zeigt die Sr 3d Anregung, im Gegensatz zu Rumpfniveaus anderer Elemente, eine unerwartete Aufspaltung, was nur durch das Vorhandensein einer zweiten chemischen Strontiumkomponente zu erklären ist. Aus quantitativen Betrachtungen lässt sich schließen, dass einige Strontiumatome während des Wachstums an die Oberfläche diffundieren und möglicherweise Strontiumoxid gebildet wird. Der zweite Schwerpunkt der vorliegenden Arbeit ist die Untersuchung von Schwer-Fermionen Supraleitern CeMIn5 (M = Co, Rh, Ir) mittels temperatur- und winkelabhängiger XPS. Bei dieser Materialklasse dominiert das feine Zusammenspiel zwischen lokalisierten Ce 4f und frei beweglichen Leitungselektronen die elektronischen Eigenschaften. Das Ce 3d Rumpfniveauspektrum besitzt für die drei Materialien eine sehr ähnliche Form, die auf eine schwache f-Hybridisierung schließen lässt. Die Spektren werden mittels einer vereinfachten Version des Anderson-Impurity Modells analysiert, wobei sich eine Ce 4f Besetzung von mehr als 0,9 ergibt. Die Temperaturabhängigkeit zeigt eine kontinuierliche und irreversible Verbreiterung ausschließlich für die Ce 3d Anregung, dieser Umstand kann einer Oxidation der reaktiven Ceratome an der Oberfläche zugeordnet werden

Crowley, Kyle McKinley. "Electrical Characterization, Transport, and Doping Effects in Two-Dimensional Transition Metal Oxides." Case Western Reserve University School of Graduate Studies / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=case1597327584506971.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Ruano, Merchán Catalina. "Synthesis and characterization of 2D complex oxide films in the SrTiO₃/Pt(111)/Al₂O₃(0001) system." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0039.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

La formation d’oxydes quasicristallins dodécagonaux 2D (OQC), ainsi que celle de phases approximantes associées ont été récemment rapportées dans des films minces dérivés des pérovskites BaTiO₃ ou SrTiO₃, déposés sur des monocristaux de Pt orientés (111). Ces structures 2D ajoutent de nouvelles fonctionnalités aux films ultra-minces d’oxydes ternaires supportés sur des métaux à l’approche de la limite 2D. Ici, nous utilisons une approche d’empilement de couches minces dans laquelle le monocristal est remplacé par une couche tampon de Pt(111), déposée par MBE sur un substrat d’Al₂O₃(0001). Un film ultra-mince de SrTiO₃ a ensuite été déposé par PLD. L’empilement de films est entièrement caractérisé par des techniques de diffraction (LEED, RHEED, XRD), de microscopie (STM, Nano-SAM,TEM) et de spectroscopie (XPS, AES). Nous rapportons la découverte de trois nouveaux approximants obtenus par réduction de ce système par recuit à haute température dans des conditions de vide poussé. Ces phases peuvent être décrites par trois pavages différents construits avec des éléments du pavage NGT. Un modèle atomique déterminé par DFT, en accord avec les observations expérimentales, est proposé pour chaque approximant. Cette approche en couche mince peut être utile pour explorer la formation de phases d’oxyde 2D complexes dans d’autres combinaisons métal-oxyde
The formation of 2D dodecagonal quasicrystalline oxides (OQC), as related approximant phases were recently reported in thin films derived from BaTiO₃ or SrTiO₃ perovskites deposited on (111)-oriented Pt single crystal. These 2D structures add novel functionalities to the ultra-thin films of ternary oxides supported on metals when approaching the 2D limit. Here, we use a thin film stacking approach in which the single crystal is replaced by a Pt (111) buffer layer, deposited by MBE on an Al₂O₃(0001) substrate. An ultra-thin film of SrTiO₃ was subsequently deposited by PLD. The film stacking is fully characterized by diffraction (LEED, RHEED, XRD),microscopy (STM, TEM, Nano-SAM) and spectroscopy (XPS, AES) techniques. We report the discovery of three OQC approximants obtained by reducing this system by annealing at high temperature under vacuum conditions. These phases can be described by three different tilings constructed with NGT elements. An atomic model determined by DFT, in agreement with the experimental observations, is proposed for each approximant. This thin-film approach can be useful for exploring the formation of complex 2D oxide phases in other metal-oxide combinations

Paerschke, Ekaterina [Verfasser], Jeroen van den [Akademischer Betreuer] Brink, Jeroen/van den [Gutachter] Brink, and Krzysztof [Gutachter] Wohlfeld. "Interplay of Strong Correlation, Spin-Orbit Coupling and Electron-Phonon Interactions in Quasi-2D Iridium Oxides / Ekaterina Paerschke ; Gutachter: Jeroen van den Brink, Krzysztof Wohlfeld ; Betreuer: Jeroen van den Brink." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://d-nb.info/1160875170/34.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Pärschke, Ekaterina [Verfasser], Jeroen van den [Akademischer Betreuer] Brink, Jeroen/van den [Gutachter] Brink, and Krzysztof [Gutachter] Wohlfeld. "Interplay of Strong Correlation, Spin-Orbit Coupling and Electron-Phonon Interactions in Quasi-2D Iridium Oxides / Ekaterina Paerschke ; Gutachter: Jeroen van den Brink, Krzysztof Wohlfeld ; Betreuer: Jeroen van den Brink." Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://d-nb.info/1160875170/34.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Mayer-Uhma, Tobias. "Von molekularen Precursoren zu Oxidphasen im System V2O5 / Nb2O5. Darstellung, Eigenschaften, katalytische Aktivität." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2004. http://nbn-resolving.de/urn:nbn:de:swb:14-1107505327269-01068.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

In this work, mixed alkoxides of general formula [V(O)Nbx(OR)(3+5x)] (R = n-C3H7 and C2H5, x = 1, 4.5 and 9) are obtained. They are used to prepare complex (V/Nb)-pentoxides. Different spectroscopic methods, for example UV/VIS, resonance raman, infrared, temperature dependant 51V NMR and two dimensional 1H or 13C NMR, are used to elucidate structural details. It can be shown that the alkoxide precursor is a mixture of monomers and dimers which exchange very quickly. 2 % [V(O)Nb(OPr)8] (Pr = propyl) exists in a 0.1 molar solution. This complex is in equilibrium with V(O)(OPr)3 and Nb(OPr)5. Nb(OPr)5 itself exchanges with [Nb(OPr)5]2. For nuclear magnetic resonance experiments the exchange has to be slowed down using low temperatures.Controlled hydrolysis at 5 °C of a mixture of V(O)(OPr)3 and [Nb(OEt)5]2 in propanol leads to a clear transparent gel. The ratio of V : Nb is 1 : 1, 1 : 4.5 or 1 : 9, and oxalic acid is used as a chelating agent. Moreover, a dried product of a frozen solution of ammonium vanadate and ammonium oxyoxalatoniobate in water is found to be an appropriate precursor for the fore-mentioned oxides. Thermal decomposition of the gels and of the freeze dried products is monitored thermoanalytically and mass spectrometrically.The compositions of the resulting phases are examined and compared with the composition obtained via conventional synthesis (sintering of powder mixtures). Phases VNbxO(2.5+2.5x) (x = 1, 4.5 and 9) are obtained through the sol-gel technique and freeze drying at distinctly lower temperatures. VNbO5 crystallizes between 400 and 650 °C and V4Nb18O55 between 550 and 750 °C. A clean, non-reduced phase, VNb9O25, crystallizes above 1100 °C in oxygen. Below this temperature, solid solutions of V2O5 in TT- or M-Nb2O5 exist. Conventionally, pure VNbO5 is not obtainable. Some sol-gel synthesized products have the advantage of a more complete phase formation. In this way, a new phase of composition VNb9O25 can be found. The phase is homöotypic to M-Nb2O5.An additional advantage of the sol-gel synthesis lies in relatively high surface areas. Adversely, carbon remaining from the alcohol groups favours the thermodynamically stable phase VNb9O25 over the phase V4Nb18O55. Consequently, the freeze drying method seems to be the best way to get metastable phases in the system V2O5/x·Nb2O5.The formation of the complex oxides is controlled through the thermodynamics at phase boundaries. Therefore, to get mixed phases, structurally similar starting materials are preferred. In other words, using V2O5 and TT-Nb2O5 as starting materials the mixed phase similar to TT-Nb2O5 can be obtained. B-Nb2O5 as precursor yields another mixed phase similar to B-Nb2O5. In this work, this effect is called the "structure directing effect". It is explained through the consumption of free enthalpy at the phase boundaries.As an additional point, catalytic activities of the complex oxides are examined. Because of a synergism of the known good activity of V2O5 and the good selectivity of Nb2O5, a strongly enhanced activity of the mixed oxides is found. Large surface areas further improve the activity. Connections between oxygen partial pressure, band gap and catalytic activity are found. A dilution of V2O5 in Nb2O5 down to 10 mol-% also causes an enhancement of catalytic activity
In der Arbeit werden durch die Synthese gemischter Alkoxide der Gesamtzusammensetzung [V(O)Nbx(OR)(3+5x)] (R = n-C3H7 und C2H5, x = 1, 4,5 und 9) sowie gefriergetrockneter Pulver Ausgangssubstanzen für gemischte, komplexe Vanadium- und Nioboxide erhalten. Untersuchungen mittels UV/VIS-, Resonanz-Raman- und IR-Spektroskopie sowie temperaturabhängiger 51V- und zweidimensionaler 1H-/13C NMR-Spektroskopie zeigen, dass es sich bei der Alkoxid-Vorstufe um ein Gemisch aus monomeren und dimeren Einheiten handelt, die in schnellem Gleichgewicht miteinander stehen. So liegt [V(O)Nb(OPr)8] als Donorkomplex vor, der im Gleichgewicht mit VO(OPr)3 und Nb(OPr)5 steht. Nb(OPr)5 steht wiederum im Gleichgewicht mit [Nb(OPr)5]2. Die Bildung und der Zerfall des Donorkomplexes erfolgen bei Raumtemperatur so schnell, dass er nur durch UV/VIS- und Resonanz-Raman-Spektroskopie sichtbar wird; bei der Kernresonanzspektroskopie muss der Austausch durch tiefe Temperaturen verlangsamt werden.Mittels kontrollierter Hydrolyse einer Mischung aus VO(OPr)3 und [Nb(OEt)5]2 in Propanol mit Oxalsäure als Chelatbildner und der Verlangsamung der Kondensation über die Erniedrigung der Temperatur wird ein homogenes, transparentes Gel aus V2O5 und Nb2O5 hergestellt. Daneben wird durch eine Lösung aus Ammoniumvanadat und Ammoniumoxyoxalatoniobat ein für die Gefriertrocknung geeigneter Precursor zur Synthese der Oxidphasen gefunden. Die Zersetzung des Gels und der gefriergetrockneten Pulver werden mittels DTA, TG und Massenspektrometrie untersucht und die Phasenausbildung mit der Reaktion von konventionellen Festkörpergemengen verglichen.Die dabei entstehenden metastabilen und thermodynamisch stabilen Phasen VNbxO(2,5+2,5x) (x = 1, 4,5 und 9) sind durch das Sol-Gel-Verfahren sowie durch die Gefriertrocknung bei deutlich niedrigeren Temperaturen und mit geringerem Fremdphasenanteil als bei der konventionellen Synthese erhältlich. VNbO5 existiert bis 650 °C, V4Nb18O55 bis 750 °C, darüber wandelt sich jede Zusammensetzung in VNb9O25 bzw. in verschiedene Nb2O5-Modifikationen und V2O5 um. Die Sol-Gel-Methode liefert im Vergleich zur Gefriertrocknung bei 900-1100 °C den Vorteil der schnelleren Phasenausbildung durch die größere Homogenität der Vorstufe. So erhält man Zwischenstufen, die sonst nur mit Beimengungen zu synthetisieren sind. In diesem Zusammenhang kann erstmalig eine zu M-Nb2O5 homöotype Verbindung der Zusammensetzung VNb9O25 erhalten werden. Ein weiterer Vorteil der Sol-Gel-Synthese ist der Erhalt größerer Oberflächen nach der Zersetzung. Nachteilig erscheinen jedoch bei einer Synthese bei tiefen Temperaturen (500-800 °C) die Alkoholatreste. So entstehen wesentlich eher die thermodynamisch begünstigten Phasen, z. B. VNb9O25 vor V4Nb18O55 und V4Nb18O55 vor VNbO5. Weiterhin macht sich die komplizierte Präparation der Gele bemerkbar; daher stellt im Allgemeinen die Gefriertrockung die Methode der Wahl dar.Die Ausbildung der komplexen Oxide erfolgt stark geprägt durch die Thermodynamik an den Phasengrenzen. Daher erfolgt eine bevorzugte Ausbildung strukturähnlicher Mischphasen. Diese erstmalig in diesem Ausmaß festgestellte Tatsache wird in der Arbeit der Strukturdirigierende Effekt genannt. Eine Erklärung dieses Effektes erfolgt anhand des Verbrauchs der Freien Enthalpie an den Phasengrenzen.Aufgrund eines Synergismus der Eigenschaften von V2O5 und Nb2O5 bei der oxidativen Dehydrierung von Propan zu Propen (relativ hohe katalytische Aktivität von V2O5 und hohe Selektivität von Nb2O5) wird eine überproportional hohe katalytische Aktivität bei den Mischoxiden erhalten. Die durch die unkonventionellen Methoden erhaltenen großen Oberflächen verbessern die Aktivität weiter. Es können Zusammenhänge festgestellt werden zwischen der Sauerstoffabgabetendenz, der Redoxkraft, der Bandlücke der Mischoxide und der katalytischen Aktivität. Die Einzigartigkeit des Nb2O5-Wirtsgitters bewirkt bei der Verdünnung von V2O5 darin eine hohe katalytische Leistungssteigerung

Більше джерел

Книги з теми "2D oxides":

Scalise, Emilio. Vibrational Properties of Defective Oxides and 2D Nanolattices. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07182-4.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Scalise, Emilio. Vibrational Properties of Defective Oxides and 2D Nanolattices: Insights from First-Principles Simulations. Springer London, Limited, 2014.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Scalise, Emilio. Vibrational Properties of Defective Oxides and 2D Nanolattices: Insights from First-Principles Simulations. Springer International Publishing AG, 2016.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Scalise, Emilio. Vibrational Properties of Defective Oxides and 2D Nanolattices: Insights from First-Principles Simulations. Springer, 2014.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Kong, X. Y., Y. C. Wang, X. F. Fan, G. F. Guo, and L. M. Tong. Free-standing grid-like nanostructures assembled into 3D open architectures for photovoltaic devices. Edited by A. V. Narlikar and Y. Y. Fu. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780199533060.013.22.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

This article describes three-dimensional open architectures with free-standing grid-like nanostructure arrays as photocatalytic electrodes for a new type of dye-sensitized solar cell. It introduces a novel technique for fabricating a series of semiconducting oxides with grid-like nanostructures replicated from the biotemplates. These semiconducting oxides, including n-type titanium dioxide or p-type nickel oxide nanogrids, were sensitized with the dye molecules, then assembled into 3D stacked-grid arrays on a flexible substrate by means of the Langmuir–Blodgett method or the ink-jet printing technique for the photocatalytic electrodes. The article first considers the fabrication of photoelectrodes with 2D grid-like nanostructures by means of the biotemplating approach before discussing the assembly and photophysicsof grid-like nanostructures into 3D open architectures for the photocatalytic electrodes.

Meier, Dennis, Jan Seidel, Marty Gregg, and Ramamoorthy Ramesh. Domain Walls. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198862499.001.0001.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Technological evolution and revolution are both driven by the discovery of new functionalities, new materials and the design of yet smaller, faster, and more energy-efficient components. Progress is being made at a breathtaking pace, stimulated by the rapidly growing demand for more powerful and readily available information technology. High-speed internet and data-streaming, home automation, tablets and smartphones are now ‘necessities’ for our everyday lives. Consumer expectations for progressively more data storage and exchange appear to be insatiable. In this context, ferroic domain walls have attracted recent attention as a completely new type of oxide interface. In addition to their functional properties, such walls are spatially mobile and can be created, moved, and erased on demand. This unique degree of flexibility enables domain walls to take an active role in future devices and hold a great potential as multifunctional 2D systems for nanoelectronics. With domain walls as reconfigurable electronic 2D components, a new generation of adaptive nano-technology and flexible circuitry becomes possible, that can be altered and upgraded throughout the lifetime of the device. Thus, what started out as fundamental research, at the limit of accessibility, is finally maturing into a promising concept for next-generation technology.

Gariglio, S., M. S. Scheurer, J. Schmalian, A. M. R. V. L. Monteiro, S. Goswami, and A. D. Caviglia. Surface and Interface Superconductivity. Edited by A. V. Narlikar. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780198738169.013.7.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

This article focuses on surface and interface superconductivity, a pivotal area of mesoscopic superconductivity. It discusses theoretical ideas regarding superconductivity in the 2D limit; pairing symmetry in systems with broken inversion symmetry and in the presence of Rashba spin–orbit interaction; and coupling of substrate phonon modes to layer electronic states to induce or enhance the superconducting condensate. It also reviews the experimental ongoing efforts to fabricate, characterize, and measure these systems, with particular emphasis on oxide materials. Superconductivity in two dimensions, in ultra-thin metals on Si(111), and at the LaAlO3/SrTiO3 interface is examined. The article concludes with an analysis of theoretical propositions aimed at realizing and testing novel superconducting states occurring at the surfaces and interfaces.

Частини книг з теми "2D oxides":

Noguera, Claudine, and Jacek Goniakowski. "Electrostatics and Polarity in 2D Oxides." In Oxide Materials at the Two-Dimensional Limit, 201–31. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-28332-6_7.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Delmas, Claude. "Intercalation in oxides from 2D to 3D intercalation." In Chemical Physics of Intercalation, 209–32. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4757-9649-0_11.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Delmas, Claude. "Alkali Metal Intercalation-Deintercalation Reactions in 2D Oxides." In Intercalation in Layered Materials, 155–58. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4757-5556-5_10.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Scalise, Emilio. "Introduction." In Vibrational Properties of Defective Oxides and 2D Nanolattices, 1–8. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07182-4_1.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Scalise, Emilio. "Theoretical Methods." In Vibrational Properties of Defective Oxides and 2D Nanolattices, 9–34. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07182-4_2.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Scalise, Emilio. "First-Principles Modelling of Vibrational Modes in Defective Oxides and Correlation with IETS." In Vibrational Properties of Defective Oxides and 2D Nanolattices, 35–60. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07182-4_3.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Scalise, Emilio. "Vibrational Properties of Silicene and Germanene." In Vibrational Properties of Defective Oxides and 2D Nanolattices, 61–93. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07182-4_4.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Scalise, Emilio. "Interaction of Silicene with Non-Metallic Layered Templates." In Vibrational Properties of Defective Oxides and 2D Nanolattices, 95–114. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07182-4_5.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Scalise, Emilio. "Conclusions and Perspectives." In Vibrational Properties of Defective Oxides and 2D Nanolattices, 115–17. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-07182-4_6.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Amollo, Tabitha A., and Vincent O. Nyamori. "Photovoltaic Application of Graphene Oxide and Reduced Graphene Oxide." In 2D Nanomaterials, 263–78. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003178453-15.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Тези доповідей конференцій з теми "2D oxides":

Blangero, M., M. Pollet, D. Carlier, J. Darriet, C. Delmas, R. Decourt, and J. P. Doumerc. "Electronic Properties of 2D Alkali Cobaltites and Related Oxides." In 2006 25th International Conference on Thermoelectrics. IEEE, 2006. http://dx.doi.org/10.1109/ict.2006.331268.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Perez-Tomas, Amador, Ekaterine Chikoidze, and David J. Rogers. "A walk on the frontier of energy electronics with power ultra-wide bandgap oxides and ultra-thin neuromorphic 2D materials." In Oxide-based Materials and Devices XII, edited by Ferechteh H. Teherani, David C. Look, and David J. Rogers. SPIE, 2021. http://dx.doi.org/10.1117/12.2590747.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Pop, Eric. "Nanoscale Limits of Resistance Switching in Some<br />Oxides and 2D Chalcogenide Materials." In 2020 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2020. http://dx.doi.org/10.7567/ssdm.2020.b-7-02.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Frugier, P., I. Ribet, and T. Advocat. "Effects of Composition Variations on the Alteration Kinetics of the UOX1 “Light Water” Borosilicate Containment Glass." In ASME 2001 8th International Conference on Radioactive Waste Management and Environmental Remediation. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/icem2001-1289.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Abstract A research and development program was outlined in June 1998 by the CEA’s Rhône Valley Research Center (Valrhô) to model the initial alteration rate r0 between 100°C and 50°C, and the long-term alteration rate r(t) over one year at 50°C, throughout the composition range for the UOX1 “light water” borosilicate containment glass as specified for the R7 and T7 vitrification facilities in the COGEMA reprocessing plant at La Hague. An experimentation plan methodology was set up for this purpose. Seven groups of glass components were designated to assess the influence of composition variations: SiO2, B2O3, Na2O, Al2O3, additive oxides (Fe2O3+NiO+Cr2O3), insoluble fine particle suspensions, and fission product and actinide oxides. The other glass constituents, accounting for 9.5 oxide wt% of the composition, were maintained constant. An empirical synergistic mixing model was postulated, based on first-degree terms and enriched with second-degree terms corresponding to the major interactions liable to exist between some constituents. The NEMROD calculation code was used to select the 22 glass compositions necessary to construct the model (i.e. to determine the values of the 15 coefficients) and the 3 control compositions. The initial rates for all 25 glass compositions were measured in pure water using a Soxhlet test device at 100°C, and in static mode at 50°C. The alteration rates at an advanced degree of reaction progress were determined in static mode at 50°C with a glass-surface-area-to-solution-volume (S/V) ratio of about 60 cm−1. The rates after one year are now available, but the tests are still in progress in order to confirm the stability over time of the steady-state conditions observed. The test results show that the initial alteration rates are clustered around the value obtained for the SON 68 reference glass composition (about 2.4 g·m−2d−1 at 100°C and 0.031 g·m−2d−1 at 50°C), with minor variations between 1.2 and 3.4 g·m−2d−1 at 100°C and between 0.012 and 0.058 g·m−2d−1 at 50°C. These slight rate variations are of considerable significance in view of the wide range of glass compositions investigated. The one-year alteration rates for the test glasses varied by a factor of about 11 around a mean value of 1 × 10−4 g·m−2d−1 at 50°C. The rate variations were modeled as a function of the glass composition variations using the NEMROD program. Other parameter values determined during static testing at the high S/V ratio were also modeled to improve our understanding of the phenomena involved: notably the altered glass thickness after one year. The order of importance of the constituents on the initial rate is not the same as for the final rate, suggesting that the alteration kinetics are controlled by different mechanisms. The initial rate was influenced primarily by the following constituents (by order of importance): the fission product oxides and SiO2 (increasing durability at increasing concentrations) and B2O3 (diminishing durability at increasing concentration). Conversely, the one-year alteration rates were found statistically to depend much more on the variability of the Na2O, Al2O3 and FP oxide concentrations than on the SiO2 concentration. Several hypotheses are proposed to account for these effects.

Marchewka, A., R. Waser, and S. Menzel. "A 2D axisymmetric dynamic drift-diffusion model for numerical simulation of resistive switching phenomena in metal oxides." In 2016 International Conference on Simulation of Semiconductor Processes and Devices (SISPAD). IEEE, 2016. http://dx.doi.org/10.1109/sispad.2016.7605168.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Meng, Guo-Hui, Bang-Yan Zhang, Hong Liu, Tong Xu, Guan-Jun Yang, Cheng-Xin Li, and Chang-Jiu Li. "Mechanisms on Vacuum Heat Treatment Promoting the Adhesion Strength of Thermal Sprayed Metallic Coatings." In ITSC2018, edited by F. Azarmi, K. Balani, H. Li, T. Eden, K. Shinoda, T. Hussain, F. L. Toma, Y. C. Lau, and J. Veilleux. ASM International, 2018. http://dx.doi.org/10.31399/asm.cp.itsc2018p0148.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Abstract In this study, the mechanisms responsible for enhancing the adhesion strength of thermally sprayed metallic coatings subjected to vacuum heat treatment were investigated using atmospheric plasma sprayed (APS) CoNiCrAlY coatings as an example. The formation of metallurgical bonding between the coating and the substrate, which determined the increase in the adhesion strength of the coatings, was studied by analyzing the effect of morphological changes of the oxide film in the coating. The results showed that during the vacuum heat treatment process, the oxide film formed during the coating deposition gradually broke down and subsequently shrank into round oxides. After vacuum heat treatment, the adhesion strength of the coating improved significantly, and there was a positive nonlinear relationship between the treatment time and the adhesion strength. The increase in the adhesion strength was caused by the formation of metallurgical bonding between the coating and the substrate. However, the prerequisite for the formation of metallurgical bonding was that the oxide film had to break during the vacuum heat treatment process. A thermodynamic 2D model based on the thermal grooving theory was proposed to explore the essential conditions for the breaking and shrinking of the oxide film.

Loh, Tamie A. J., Y. Hu, K. C. Pham, Z. Tan, and Daniel H. C. Chua. "Multifunctional metal oxides and 2D materials utilizing carbon nanotubes as a base template for clean energy and other applications." In 2016 IEEE 16th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2016. http://dx.doi.org/10.1109/nano.2016.7751577.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Xu, Xieyu, Olesya Kapitanova, Daniil Itkis, Pavel Evdokimov, Nikita Yarenkov, Olga Eremina, Marat Gallyamov, Rishat Valeev, Andrey Eliseev, and Gennady Panin. "Redox processes in graphene oxide for storing and converting energy." In PROCEEDINGS OF INTERNATIONAL CONGRESS ON GRAPHENE, 2D MATERIALS AND APPLICATIONS (2D MATERIALS 2019). AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0056500.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

wu, jiayang, yuning zhang, yunyi yang, yang qu, Yang Sun, christian grillet, christelle Monat, baohua Jia, and David J. Moss. "Graphene oxide for enhanced nonlinear optics in integrated waveguides." In 2D Photonic Materials and Devices VII, edited by Arka Majumdar, Carlos M. Torres, and Hui Deng. SPIE, 2024. http://dx.doi.org/10.1117/12.3005069.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Wu, Jiayang, Yunyi Yang, Xingyuan Xu, Linnan Jia, Yao Liang, Sai Tak Chu, Brent Little, Roberto Morandotti, Baohua Jia, and David Moss. "Enhanced four-wave mixing in hybrid integrated waveguides with graphene oxide." In 2D Photonic Materials and Devices II, edited by Arka Majumdar, Carlos M. Torres, and Hui Deng. SPIE, 2019. http://dx.doi.org/10.1117/12.2508120.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Звіти організацій з теми "2D oxides":

Chambers, Scott, Petr Sushko, and Timothy Droubay. New Quantum Phenomena by Combining 2D Materials with Complex Oxides. Office of Scientific and Technical Information (OSTI), August 2020. http://dx.doi.org/10.2172/1988292.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Pramanik, Avijit, Olorunsola Praise Kolawole, Kaelin Gates, Sanchita Kundu, Manoj Shukla, Robert Moser, Mine Ucak-Astarlioglu, Ahmed Al-Ostaz, and Paresh Chandra Ray. 2D fluorinated graphene oxide (FGO)-polyethyleneimine (PEI) based 3D porous nanoplatform for effective removal of forever toxic chemicals, pharmaceutical toxins, and waterborne pathogens from environmental water samples. Engineer Research and Development Center (U.S.), February 2024. http://dx.doi.org/10.21079/11681/48232.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Анотація:

Although water is essential for life, as per the United Nations, around 2 billion people in this world lack access to safely managed drinking water services at home. Herein we report the development of a two-dimensional (2D) fluorinated graphene oxide (FGO) and polyethylenimine (PEI) based three-dimensional (3D) porous nanoplatform for the effective removal of polyfluoroalkyl substances (PFAS), pharmaceutical toxins, and waterborne pathogens from contaminated water. Experimental data show that the FGO-PEI based nanoplatform has an estimated adsorption capacity (𝘲ₘ) of ∼219 mg g⁻¹ for perfluorononanoic acid (PFNA) and can be used for 99% removal of several short- and long-chain PFAS. A comparative PFNA capturing study using different types of nanoplatforms indicates that the 𝘲ₘ value is in the order FGO-PEI > FGO > GO-PEI, which indicates that fluorophilic, electrostatic, and hydrophobic interactions play important roles for the removal of PFAS. Reported data show that the FGO-PEI based nanoplatform has a capability for 100% removal of moxifloxacin antibiotics with an estimated 𝘲ₘ of ∼299 mg g⁻¹. Furthermore, because the pore size of the nanoplatform is much smaller than the size of pathogens, it has a capability for 100% removal of Salmonella and Escherichia coli from water. Moreover, reported data show around 96% removal of PFAS, pharmaceutical toxins, and pathogens simultaneously from spiked river, lake, and tap water samples using the nanoplatform.