Bibliografie tematiche / CuO-Cu₂O

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Letteratura scientifica selezionata sul tema "CuO-Cu₂O"

Autore: Grafiati

Pubblicato: 19 ottobre 2024

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Articoli di riviste sul tema "CuO-Cu₂O"

Dubale, Amare Aregahegn, Chun-Jern Pan, Andebet Gedamu Tamirat, Hung-Ming Chen, Wei-Nien Su, Ching-Hsiang Chen, John Rick et al. "Heterostructured Cu2O/CuO decorated with nickel as a highly efficient photocathode for photoelectrochemical water reduction". Journal of Materials Chemistry A 3, n. 23 (2015): 12482–99. http://dx.doi.org/10.1039/c5ta01961c.

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Jiang, Qing, Jiajie Jiang, Runkang Deng, Xinyuan Xie e Jianxin Meng. "Controllable preparation of CuO/Cu2O composite particles with enhanced photocatalytic performance". New Journal of Chemistry 44, n. 16 (2020): 6369–74. http://dx.doi.org/10.1039/d0nj00090f.

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Xu, Panpan, Jijun Liu, Tong Liu, Ke Ye, Kui Cheng, Jinling Yin, Dianxue Cao, Guiling Wang e Qiang Li. "Preparation of binder-free CuO/Cu2O/Cu composites: a novel electrode material for supercapacitor applications". RSC Advances 6, n. 34 (2016): 28270–78. http://dx.doi.org/10.1039/c6ra00004e.

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Abstract (sommario):

The results of XRD and XPS demonstrate that CuO/Cu₂O/Cu is prepared successfully via a facile, eco-friendly, one-step template-free growth process. SEM figures show that cubic CuO/Cu₂O/Cu uniformly and densely covers a skeleton of nickel foam.

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Wang, Peng, Xiaoming Wen, Rose Amal e Yun Hau Ng. "Introducing a protective interlayer of TiO2 in Cu2O–CuO heterojunction thin film as a highly stable visible light photocathode". RSC Advances 5, n. 7 (2015): 5231–36. http://dx.doi.org/10.1039/c4ra13464h.

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Photoactivity and stability of Cu₂O–CuO heterojunction thin films are enhanced by incorporating an interlayer of TiO₂. The thin TiO₂ layer minimises the redox reactions at Cu₂O–electrolyte interface and facilitates charge transfer from Cu₂O to CuO.

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Fatoni, Ahmad, Mauizatul Hasanah, Lasmaryna Sirumapea, Annisa Defanie Putri, Khoirunnisa Sari, Restu Dwi Khairani e Nurlisa Hidayati. "Synthesis, Characterization of Polyvinyl Alcohol-Chitosan-ZnO/CuO Nanoparticles Film and Its Biological Evaluation as An Antibacterial Agent of Staphylococcus aureus". al-Kimiya 10, n. 1 (30 giugno 2023): 1–12. http://dx.doi.org/10.15575/ak.v10i1.24725.

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The polyvinyl alcohol-chitosan-ZnO/CuO nanoparticles film was researched. Synthesis, characterization, and its biological evaluation as an antibacterial of Staphylococcus aureus were the aims of this research. The biosynthesis of ZnO, CuO, and ZnO/CuO nanoparticles was done using the biological method. The polyvinyl alcohol-chitosan-ZnO/CuO nanoparticles film was synthesized using the casting method. All the products were characterized by FTIR spectroscopy, X-ray diffraction, and Scanning Electron Microscope (SEM). Polyvinyl alcohol-chitosan-ZnO/CuO nanoparticles film as a paper disk for the evaluation as an antibacterial agent through the agar disk diffusion method. The absorption bands of ZnO, CuO, and ZnO/CuO nanoparticles can be observed at 318, 274, and 252 nm, respectively. The peaks at wavenumbers 433-673 and 619 cm-1 were Zn-O and Cu-O groups, respectively. The Zn-O and Cu-O groups at ZnO/CuO nanoparticles can be observed at 474 and 619 cm-1. The appearance of Zn-O and Cu-O groups at film PVA-chitosan-ZnO/CuO nanoparticles indicates the wavenumber between 433 and 673 cm-1. The physical structure of ZnO, CuO, and ZnO/CuO nanoparticles is crystalline form. The crystallite size of ZnO, CuO, and ZnO/CuO nanoparticles was estimated at 1.0572, 6.6315, and 2.3333 nm respectively. The physical structure of film PVA-chitosan-ZnO/CuO nanoparticles is amorphous. The surface morphology of films C, D, and E was affected by the addition of chitosan and ZnO/CuO nanoparticles. The film of PVA-chitosan-ZnO/CuO nanoparticles (C, D and E) can act as an antibaterial agent of Staphylococcus aureus.The inhibition zone of film D is higher than A, B, C, and E.

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OGUSHI, T., M. HIROSE, S. KOBA, S. HIGO e I. KAWANO. "TRANSPORT PROPERTIES OF CuO IN YBCO/CuO/YBCO JUNCTION". Modern Physics Letters B 09, n. 17 (20 luglio 1995): 1059–67. http://dx.doi.org/10.1142/s0217984995001042.

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The zero resistance behavior of a CuO film sandwiched with YBa 2 Cu 3 O 7–δ films has been examined. The CuO is of tenorite C2/c structure which is a deformed NaCl-type lattice structure without being separated by an alkaline earth, and it forms a bulk in which copper is surrounded by nearly a square of Oxygen. The transition temperature Tce (R=0) in the fabricated sandwiched-type-CuO optimally increases over that of YBa 2 Cu 3 O 7–δ film-electrodes.

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Liu, Baolin, Yizhao Li, Kun Wang e Yali Cao. "The solid-state in situ construction of Cu2O/CuO heterostructures with adjustable phase compositions to promote CO oxidation activity". CrystEngComm 22, n. 45 (2020): 7808–15. http://dx.doi.org/10.1039/d0ce01324b.

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Cu₂O/CuO heterojunctions were fabricated via in situ solid-state technology. Tuning the ratio of reactants enables optimization of the components of the Cu₂O/CuO heterostructures and their catalytic activities for CO oxidation.

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Fatoni, Ahmad, Ade Chika Paramita, Budi Untari e Nurlisa Hidayati. "Chitosan-CuO Nanoparticles as Antibacterial Shigella dysenteriae: Synthesis, Characterization, and In Vitro Study". Jurnal Kimia Sains dan Aplikasi 23, n. 12 (9 gennaio 2021): 432–39. http://dx.doi.org/10.14710/jksa.23.12.432-439.

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The synthesis of chitosan- CuO nanoparticles was studied. This research’s aims were biosynthesis CuO nanoparticles, synthesis of chitosan-CuO nanoparticles, and used as an antibacterial agent of Shigella dysenteriae. CuO nanoparticles and chitosan-CuO nanoparticles were characterized by FTIR spectroscopy and X-ray diffraction, respectively. CuO nanoparticle was synthesized by the reaction between leaf extract of sweet star fruit (Averrhoa carambola L.) and copper sulfate pentahydrate. Chitosan-CuO nanoparticles were synthesized by a heating method. The suspension of chitosan-CuO nanoparticles was used as an antibacterial agent with a paper disk method. The result showed that the Cu-O group at CuO nanoparticles was detected at a wavenumber of 503, 619, 767, and 821 cm-1. The crystallite size of the CuO nanoparticles was 4.25 nm. Cu-O group bonded at N-H and O-H groups and detected at 3406 cm-1 from the FTIR spectra of chitosan-CuO nanoparticles. The average inhibition zone of chitosan-CuO nanoparticles at concentration 2.500, 5.000, 7.500, and 10.000 ppm to Shigella dysenteriae were 13.57 ± 1.55; 14.90 ± 1.20; 15.97 ± 0.76 and 17.03 ± 1.80 mm, respectively.

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Hamouda, Ragaa A., Mada A. Alharthi, Amenah S. Alotaibi, Asma Massad Alenzi, Doha A. Albalawi e Rabab R. Makharita. "Biogenic Nanoparticles Silver and Copper and Their Composites Derived from Marine Alga Ulva lactuca: Insight into the Characterizations, Antibacterial Activity, and Anti-Biofilm Formation". Molecules 28, n. 17 (29 agosto 2023): 6324. http://dx.doi.org/10.3390/molecules28176324.

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Bacterial pathogens cause pain and death, add significantly to the expense of healthcare globally, and pose a serious concern in many aspects of daily life. Additionally, they raise significant issues in other industries, including pharmaceuticals, clothing, and food packaging. Due to their unique properties, a great deal of attention has been given to biogenic metal nanoparticles, nanocomposites, and their applications against pathogenic bacteria. This study is focused on biogenic silver and copper nanoparticles and their composites (UL/Ag2 O-NPS, Ul/CuO-NPs, and Ul/Ag/Cu-NCMs) produced by the marine green alga Ulva lactuca. The characterization of biogenic nanoparticles UL/Ag2 O-NPS and Ul/CuO-NPs and their composites Ul/Ag/Cu-NCMs has been accomplished by FT-IR, SEM, TEM, EDS, XRD, and the zeta potential. Minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) experiments were conducted to prove antibacterial activity against both Gram-positive and Gram-negative bacteria and anti-biofilm. The FTIR spectroscopy results indicate the exiting band at 1633 cm−1, which represents N–H stretching in nanocomposites, with a small shift in both copper and silver nanoparticles, which is responsible for the bio-reduction of nanoparticles. The TEM image reveals that the Ul/Ag/Cu-NCMs were hexagonal, and the size distribution ranged from 10 to 35 nm. Meanwhile, Ul/CuO-NPs are rod-shaped, whereas UL/Ag2 O-NPS are spherical. The EDX analysis shows that Cu metal was present in a high weight percentage over Ag in the case of bio-Ag/Cu-NCMs. The X-ray diffraction denotes that Ul/Ag/Cu-NCMs, UL/CuO-NPs, and UL/Ag2 O-NPS were crystalline. The results predicted by the zeta potential demonstrate that Ul/Ag/Cu-NCMs were more stable than Ul/CuO-NPs. The antibacterial activity of UL/Ag2 O-NPS, Ul/Ag/Cu-NCMs, and UL/CuO-NPs was studied against eleven Gram-negative and Gram-positive multidrug-resistant bacterial species. The maximum inhibition zones were obtained with UL/Ag2 O-NPS, followed by Ul/Ag/Cu-NCMs and Ul/CuO-NPs in all the tested bacteria. The maximum anti-biofilm percentage formed by E. coli KY856933 was obtained with UL/Ag2 O-NPS. These findings suggest that the synthesized nanoparticles might be a great alternative for use as an antibacterial agent against different multidrug-resistant bacterial strains.

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Sano, Akihiro, Mikio Eto e Hiroshi Kamimura. "I. First Principles Cluster Calculations for the Electronic Structures of CuO7 Octahedron and CuO5 Pyramid". International Journal of Modern Physics B 11, n. 32 (30 dicembre 1997): 3733–50. http://dx.doi.org/10.1142/s021797929700191x.

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In this paper we first describe the multi-configuration self-consistent field method with configuration interaction (MCSCF-CI) which is a variational method most suitable for strongly-correlated cluster systems. Then the calculated results of CuO 6 cluster embedded in hole-doped La 2-x Sr x CuO 4 and of CuO 4 cluster in the electron-doped Nd 2-x Ce x CuO 4 are reviewed. Finally the calculated results on the electronic structure of CuO 5 pyramid embedded in the insulating YBa 2 Cu 3 O 6 and superconducting YBa2Cu3O7 are newly presented. In the latter case we will clarify an important role of the Cu-O chain in the electronic and superconducting state of YBa2Cu3O7 .

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Più fonti

Tesi sul tema "CuO-Cu₂O"

Singer, Philip Morgan 1973. "¹⁷O and ⁶³Cu nuclear resonance study of the inhomogeneous electronic state in La₂âxÌ³SrxÌ³CuO₄". Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/29313.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, February 2003.
In title on t.p., double-underscored "x" appears as subscript.
Includes bibliographical references (p. 138-144).
by Philip Morgan Singer.
Ph.D.

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Park, Jung-Chul. "Oxydation électrochimique d'oxydes en milieu alcalin : application aux matériaux supraconducteurs La₂CuO₄ et YBa₂Cu₃O₇-δ". Bordeaux 1, 1990. http://www.theses.fr/1990BOR10630.

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L'OXYDATION ELECTROCHIMIQUE EN MILIEU ALCALIN EST DECRITE COMME NOUVELLE VOIE DE PREPARATION D'OXYDES SUPRACONDUCTEURS PAR CHIMIE DOUCE, A TEMPERATURE AMBIANTE. CETTE METHODE A ETE APPLIQUEE PLUS SPECIALEMENT AUX DEUX OXYDES CONSIDERES COMME MODELES, La₂CuO₄ et YBa₂Cu₃O7-δ. DANS LE CAS DE La₂CuO₄, NOUS AVONS PU PREPARER PAR INTERCALATION DE L'OXYGENE DANS LE RESEAU CRISTALLIN, UNE PHASE SURSTCHIOMETRIQUE EN OXYGENE#1, DE COMPOSITION La₂CuO₄. O₇. LES PROPRIETES PHYSIQUES DE CE MATERIAU TOUT-A-FAIT REMARQUABLES SONT CARACTERISTIQUES D'UN PRODUIT MONOPHASE CONDUCTEUR METALLIQUE, PUIS SUPRACONDUCTEUR EN-DECA DE T#C=44 K. DIVERSES CARACTERISATIONS SPECTROSCOPIQUES ET PHYSICO-CHIMIQUES ONT PERMIS DE MONTRER QUE LES ESPECES INTERCALEES ETAIENT VRAISEMBLABLEMENT DES ANIONS O#2# DANS LES SITES TETRAEDRIQUES VACANTS DE LA COUCHE COMPACTE LA#2O#2 DONNANT NAISSANCE A LA FORMATION DE CUIVRE TRIVALENT CU#3#+ OU EN D'AUTRES TERMES A DES TROUS DANS LA BANDE OXYGENE-CUIVRE. EN CE QUI CONCERNE LA PHASE YBa₂Cu₃O7-δ, SENSIBLE AU MILIEU ELECTROLYTIQUE UTILISE, DES CERAMIQUES DENSES ONT DUES ETRE PREPAREES PAR UNE METHODE ORIGINALE, PUIS LES CONDITIONS DE STABILITE DE CE MATERIAU ONT ETE DETERMINEES. LES ETUDES ELECTROCHIMIQUES ONT MONTRE DES DIFFICULTES PLUS GRANDES QUE DANS LE CAS DE La₂CuO₄ POUR CONTROLER LA TENEUR EN OXYGENE DUES AU FAIT QUE L'ACTIVITE DE L'OXYGENE OBTENUE PAR VOIE ELECTROCHIMIQUE EST TRES GRANDE ET QUE LA DIFFUSION DE L'OXYGENE DANS LE RESEAU CRISTALLIN EST RAPIDE RENDANT DIFFICILE LA MAITRISE DE LA STCHIOMETRIE

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Pesetski, Aaron A. "Experimental study of the inductance of pinned vortices in YBa?Cu?O?-? and La?.??Sr?.??CuO? superconducting thin films /". The Ohio State University, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=osu1488202678772565.

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Mottershead, Jeffrey Daniel. "Angle-resolved photoemission spectroscopy studies of Tl₂Ba₂CuO₆+δ and YBa₂Cu₃O₇-δ : analysis of recent results and the construction of a new system". Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/39895.

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Recent angle-resolved photoemission spectroscopy (ARPES) results, from experiments performed at the Swiss Light Source, Stanford Synchrotron Radiation Lightsource, and Advanced Light Source synchrotrons, on the high-temperature superconductors Tl₂Ba₂CuO₆+δ (Tl2201) and YBa₂Cu₃O (YBCO₆.₅) are presented. An overdoped Tl2201 sample with a TC of 30K was found to have a Fermi surface, consisting of a large hole pocket centred at (Pi ,Pi ), which is approaching a topological transition. A superconducting gap consistent with a dχ₂−y₂ order parameter was detected. In contrast with the underdoped HTSCs, where the quasiparticle (QP) linewidth at the top of the band is maximal in the antinodal direction and minimal in the nodal direction, overdoped Tl2201 was revealed to have a reverse nodal-antinodal anisotropy, with sharp QP peaks in the antinodal region and broader peaks in the nodal region. The Tl2201 results establish Tl2201 as a valuable material for exploring the overdoped side of the phase diagram with ARPES. Synchrotron experiments also yielded the first successful ARPES results on underdoped YBa₂Cu₃O₇−δ (YBCO). Surface-sensitive techniques were previously unsuccessful in studying YBCO because its cleaved surfaces are polar, resulting in an overdoped surface regardless of the doping level of the bulk. By doping the cleaved surfaces with potassium, the surface was progressively hole underdoped from as-cleaved continuously to the doping of the bulk, and subsequent ARPES experiments performed revealed a transition from a holelike Fermi surface on the as-cleaved surface to disconnected Fermi arcs when the surface doping matched the bulk. In parallel with the synchrotron-based research, an in-house ARPES system was constructed at the University of British Columbia (UBC). Unlike conventional ARPES systems, the ARPES setup at UBC incorporates a molecular beam epitaxy (MBE) system, which allows novel materials to be grown, characterized, and transferred to the ARPES chamber in vacuo. Novel design techniques to improve the accuracy of ARPES measurements are presented. The in-house ARPES system also serves as a prototype for an ARPES–MBE endstation being constructed at the Canadian Light Source (CLS). Design studies of some potential improvements to the in-house system, to be implemented at the CLS, are also presented.

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Ibn, Mahrsi Mouna. "Nanohybrides ZnO/Ag ou ZnO/oxyde de cuivre pour applications photocatalytiques". Electronic Thesis or Diss., Université de Lorraine, 2024. http://www.theses.fr/2024LORR0044.

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La croissance rapide de la population ainsi que l'industrialisation ont suscité des inquiétudes majeures quant à la disponibilité de l'énergie et à la pollution de l'environnement. La résolution de ces problèmes est au cœur de nombreuses recherches à l'échelle mondiale. L'énergie solaire, en tant que source d'énergie propre et pratiquement inépuisable, devrait être efficacement exploitée, notamment via des processus photocatalytiques, pour améliorer la dépollution environnementale. Les nanomatériaux hybrides, tels que ZnO/métal noble et ZnO/oxydes métalliques, se positionnent comme des candidats prometteurs pour atteindre ces objectifs car ils absorbent efficacement la lumière visible et permettent une séparation efficace des porteurs de charge. Ce mémoire est consacré au développement de nouveaux photocatalyseurs hétérostructurés pour la dégradation des polluants organiques. L'étude a exploré deux voies novatrices de synthèse de ZnO associé soit à des nanoparticules d'argent métallique soit à des oxydes de cuivre. Dans la première partie de cette mémoire, un procédé a été développé pour préparer des particules de ZnO d'environ 87 nm associées à des nanoparticules d'argent d'une taille moyenne de 2.7 nm. Cette stratégie met en œuvre la synthèse d'hydroxydes doubles lamellaires de zinc dopés à l'argent, suivie de la photodéposition des ions Ag+ en Ag(0), et enfin, la conversion par thermolyse de l'hydroxyde double lamellaire en oxyde de zinc. Dans la deuxième partie de la thèse, la photodéposition de nanoparticules de CuO-Cu₂O à la surface de ZnO a permis le développement d’hétérostructures avec une jonction p-n entre CuO-Cu₂O et ZnO. Les nouvelles méthodes de synthèse de catalyseurs hétérostructurés développées dans le cadre de cette thèse ont permis le développement de matériaux photocatalytiquement actifs pour la dégradation de polluants persistants en milieux aqueux. En termes de stabilité, ces catalyseurs peuvent être utilisés sur plusieurs cycles de dégradation sans perte notable d'efficacité. Le projet comporte également l'étude des différents paramètres expérimentaux afin d'optimiser les propriétés structurales, électroniques, optiques et photocatalytiques de ces matériaux
The fast growth of the population and industrialization have produced major concerns regarding energy availability and environmental pollution. Addressing these issues is at the forefront of global research. Solar energy, as a clean and almost infinite source, can be effectively harnessed through photocatalytic processes to contribute to environmental remediation. Hybrid nanomaterials, such as ZnO/noble metal and ZnO/metal oxides, emerge as promising candidates to achieve these goals due to their enhanced light absorption capability and excellent charge carrier separation. This thesis is dedicated to the development of new hybrid photocatalysts designed for the degradation of organic pollutants. The study explores two innovative synthesis pathways of ZnO, combined with photodeposited nanoparticles of metallic silver or copper oxide, onto ZnO. In the first part of the study, a solvothermal method was developed to prepare ZnO particles of approximately 87 nm associated with silver nanoparticles with an average size of 2.7 nm. This strategy involves the synthesis of silver-doped zinc double-layered hydroxides, followed by the photodeposition of Ag+ ions into Ag(0), and ultimately, the conversion through thermolysis of the double-layered hydroxide into ZnO. In the second part, the preparation via an environmentally friendly and easy photodeposition method was used to create heterostructured photocatalysts featuring a p-n junction between CuO-Cu₂O and ZnO. The novel synthesis methods for ZnO-based heterostructured catalysts developed in the framework of this thesis have led to the creation of nanohybrid materials exhibiting high efficiency in degrading persistent pollutants in aqueous environments. In terms of stability, these hybrid photocatalysts can be used over multiple degradation cycles without a significant loss of effectiveness. The project also involves the study of various experimental parameters to optimize the structural, electronic, and optical properties of the photocatalysts

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Neubeck, Wolfgang. "Etude des propriétés magnétiques et électroniques des oxydes de métaux de transition MnO, CoO, NiO et CuO par diffraction magnétique de rayons X". Université Joseph Fourier (Grenoble), 2000. http://www.theses.fr/2000GRE10216.

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Ce travail de these presente les resultats d'experiences de diffraction magnetique obtenus sur des oxydes de metaux de transition : mno, coo, nio et cuo. La diffraction magnetique de rayons x non-resonante est une sonde experimentale unique, qui permet la separation des contributions du spin et du moment orbital a la densite totale d'aimantation. Nos resultats experimentaux montrent des moments orbitaux non-nuls dans coo (l/s=0. 95), nio (l/s=0. 34) et cuo (l/s=0. 18). Uniquement dans le cas de mno le moment orbital est nul. En fait, les interactions spin-orbite peuvent retablir partiellement le moment orbital ; nos resultats montrent qu'elles devraient etre considerees quand on discute les proprietes electroniques ainsi que magnetiques. La diffraction magnetique de rayons x resonante est observee quand l'energie des photons est proche des seuils d'absorptions. Elle est interpretee par des transitions electroniques multipolaires entre les etats du coeur et des etats libre au-dessus du niveau de fermi. Des resonances importantes indiquent que les etats intermediaires presentent un fort couplage spin-orbite et qu'il existe un moment orbital. Au seuil k des metaux 3d deux canaux resonants existent : la resonance dipolaire (e1) qui sonde les etats 4p, peu polarises, et la resonance quadrupolaire (e2) qui sonde les etats 3d, fortement polarises. Des resonances e2 sont observees dans nio, coo et cuo, qui ont tous un moment orbital. Par contre dans mno, ou les ions mn 2 + sont dans un etat s, de faibles anomalies sont observees, provenant du couplage spin-orbite dans la couche 3d. En plus de la resonance e2 tous les systemes presentent une resonance supplementaire de type e1. Alors que le processus e2, qui sonde les etats 3d fortement

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CHEN, JIAN-REN, e 陳建任. "BiO-(Ca, Sr)O-CuO 850 C 擬三元等溫相圖及Pb添加與Ca/Sr 比變化對Bi Ca Sr Cu O 超導相生成之影響". Thesis, 1989. http://ndltd.ncl.edu.tw/handle/42770729894669402581.

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Libri sul tema "CuO-Cu₂O"

Roessli, Bertrand. Etude des composés HoBa₂Cu₃O[subscript 6+x], RBA₂Cu₄O₈ (R=Ho, Dy), Bi₂CuO₄ et CuGeO₃ par diffusion des neutrons. 1994.

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Pinkpank, Markus. Rare earth magnetism in cuprates: Muon spin rotation studies on GdBa₂Cu₃O₆[subscript +x], HoBa₂Cu₃O₆[subscript +x] and Nd₁.₄Ce₀.₂Sr₀.₄CuO₄[-sigma]. 2000.

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Mangelschots, Iris. Studies in high-T[subscript c] superconductors: I. Defect structure in Nd₁.₈₅Ce₀.₁₅CuO[subscript 4±y] single crystals; II. O and Cu NMR/NWR in YBa₂Cu₄O₈. 1993.

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Capitoli di libri sul tema "CuO-Cu₂O"

Salomie, Dana, Codruta Pavel e Radu Mureşan. "The Elaboration of Composite Materials from the Cu-Al₂O₃ System Using CuO and Al₂O₃ Powders". In Materials and Technologies, 83–86. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-460-x.83.

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F. Piñón-Espitia, Manuel, Guillermo M. Herrera-Pérez e Matha T. Ochoa-Lara. "Electronic and Magnetic Contribution for CuO and CuO Nanofibers Doped with Mn at 3.0%". In Electrospinning - Theory, Applications, and Update Challenges [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.112897.

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The copper (II) oxide nanofibers (NFs) synthesized with the electrospinning method showed a necklace-like morphology and nanometric size. The use of the XPS (X-ray Photoelectronic Spectroscopy) technique allowed the analysis of the Cu 2p and O 1s orbitals showing a CuxO type stoichiometry (x = 1, 2, 3), in turn, the UPS (Ultraviolet Photoelectronic Spectroscopy) region determined the conduction state associated to the dielectric function. These data are compared with the EELS technique. The NFs have presented a behavior with double magnetic phase associated to the non-stoichiometry and oxygen vacancies, and the non-presence of the AFM phase due to the increase of the vacancies. In addition, their electronic and magnetic structure reveal spin-orbit related changes shown in the Cu 2p spectra. The results showed in the conduction band holes and the Cu 2p and O 1s orbitals.

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Atti di convegni sul tema "CuO-Cu₂O"

Lin, Hsien-Sheng, Zong-Zhi Lin, Shih-Chiang Lin, Yen-Huai Ma, Yu-Jen Chen e Che-Wei Lin. "Synthesizing the CuO-Cu₂O Film by Using the One-Step Electrochemical Method for the Biosensor with IoT Function". In 2024 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM), 1–4. IEEE, 2024. http://dx.doi.org/10.1109/iwem59914.2024.10649395.

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Tomar, Laxmi J., Rahul K. Desai e Bishwajit S. Chakrabarty. "Study of optical properties of hydrothermally synthesized Cu∕Cu[sub 2]O∕CuO nanocrystals". In PROCEEDING OF INTERNATIONAL CONFERENCE ON RECENT TRENDS IN APPLIED PHYSICS AND MATERIAL SCIENCE: RAM 2013. AIP, 2013. http://dx.doi.org/10.1063/1.4810192.

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Ullrich, B., I. Kulac, H. Pint, G. Leising e H. Kahlert. "Investigation of the optical properties of metallic and nonmetallic Y-Ba-Cu-O compounds". In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.fh1.

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Abstract (sommario):

The research on Y-Ba-Cu-O compounds has advanced tremendously since the discovery of high-T c superconductivity in 1986. First of all, the complete comprehension of the mechanism of superconductivity is of current interest. To date, the phenomenon of high-T c superconductivity in Y-Ba-Cu-O compounds cannot be understood by a consistent theory. Depending on the oxygen concentration in YBa2Cu3O7- x ′ one must distinguish between the metallic (0 ≤ x ≤ 0.5) and the semiconducting (0.6 ≤ x ≤ 1) states. Both phases were prepared a) by magnetron sputtering on SrTiO3 or sapphire substrates, resulting in thin (1 μm) films and b) by sintering of a polycrystalline mixture of Y2O3, BaCO3, and CuO. The dielectric constant and refractive index were pointed out by Kramers-Kronig analysis. The photocurrent of YBa2Cu3O6 was investigated experimentally and theoretically. It was demonstrated that the classical semiconductor theory holds for this kind of material. The Franz-Keldysh effect was observed in absorption and photocurrent. Beyond the classical features, new and previously not observed optical properties are reported: Superconductivity can be induced and tuned by laser illumination. Furthermore, it is possible to create a gradient of oxygen concentration perpendicular to the surface, causing a gap that depends on the depth of the samples. This leads to tuneable shifts between the photoluminescence and photocurrent maxima. Finally, from the combination of optical and electrical properties, a new model for the calculation of the critical temperature in Y-Ba-Cu-O compounds is presented.

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Aboudihab, I., Alain Gilabert, Alain Azema, Jean-Claude Roustan, Michael Schwerdtfeger e Jean-Claude Villegier. "Bolometric photoresponse of superconducting YBa 2 Cu 3 O 7-x /La 2 CuO 4 multilayers to infrared radiation". In OE/LASE '94, a cura di Michael Nahum e Jean-Claude Villegier. SPIE, 1994. http://dx.doi.org/10.1117/12.176148.

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Gallo, S., J. Barnett, D. Rao, D. Haran, F. Wright, R. Lilly, S. Oseroff et al. "Role of Cu-O planes on the magnetic and electric properties of Gd/sub 2/CuO./sub 4/ single crystals". In International Magnetics Conference. IEEE, 1989. http://dx.doi.org/10.1109/intmag.1989.690045.

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Egami, T., R. J. McQueeney, Y. Petrov, M. Yethiraj, G. Shirane e Y. Endoh. "Low temperature anomaly of LO phonons in La[sub 1.85]Sr[sub 0.15]CuO[sub 4] and YBa[sub 2]Cu[sub 3]O[sub 7]". In High temperature superconductivity. AIP, 1999. http://dx.doi.org/10.1063/1.59621.

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Niedermayer, Ch, T. Blasius, C. Bernhard, A. Golnik, A. Moodenbaugh e J. I. Budnick. "Hole doping dependence of the antiferromagnetic correlations in La[sub 2−x]Sr[sub x]CuO[sub 4] and Y[sub 1−x]Ca[sub x]Ba[sub 2]Cu[sub 3]O[sub 6]". In High temperature superconductivity. AIP, 1999. http://dx.doi.org/10.1063/1.59630.

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Rapporti di organizzazioni sul tema "CuO-Cu₂O"

Lindroos, M., A. Bansil, K. Gofron, J. C. Campuzano, H. Ding, R. Liu e B. W. Veal. Signature of the CuO{sub 2} plane related bands in YBa{sub 2}Cu{sub 3}O{sub 6.9} as seen by angle-resolved photoemission. Office of Scientific and Technical Information (OSTI), settembre 1992. http://dx.doi.org/10.2172/10158490.

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Egami, T., Y. Petrov, R. J. McQueeney, M. Yethiraj, G. Shirane e Y. Endoh. Low temperature anomaly of LO phonons in La{sub 1.85}Sr{sub 0.15}CuO{sub 4} and YBa{sub 2}Cu{sub 3}O{sub 7}. Office of Scientific and Technical Information (OSTI), aprile 1999. http://dx.doi.org/10.2172/334198.

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Whangbo, Myung-Hwan, M. Evain, E. Canadell e J. M. Williams. Linear electron-hole-electron pair model of high-temperature superconductivity in La sub 2-x M sub x CuO sub 4 and YBa sub 2 Cu sub 3 O sub 7-y : 2, Dependence of the superconducting transition temperatures on pressure and on hole concentration. Office of Scientific and Technical Information (OSTI), gennaio 1989. http://dx.doi.org/10.2172/5469409.

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