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Articoli di riviste sul tema "CuO-Cu₂O"

Autore: Grafiati

Pubblicato: 19 ottobre 2024

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1

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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2

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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3

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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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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4

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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5

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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6

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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7

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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8

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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9

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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10

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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11

Sharma, Aditya, Mayora Varshney, Jaehun Park, Tae-Kyun Ha, Keun-Hwa Chae e Hyun-Joon Shin. "XANES, EXAFS and photocatalytic investigations on copper oxide nanoparticles and nanocomposites". RSC Advances 5, n. 28 (2015): 21762–71. http://dx.doi.org/10.1039/c4ra16217j.

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CuO nanoparticles, Cu₂O/CuO and CuO/TiO₂ nanocomposites exhibit excellent photocatalyst properties toward the degradation of methyl-orange and potassium-dichromate under the visible light irradiation.

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12

Kar, Ashish Kumar, e Rajendra Srivastava. "Selective synthesis of Cu–Cu2O/C and CuO–Cu2O/C catalysts for Pd-free C–C, C–N coupling and oxidation reactions". Inorganic Chemistry Frontiers 6, n. 2 (2019): 576–89. http://dx.doi.org/10.1039/c8qi01198b.

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Cu-BTC MOF provides highly nanoporous Cu–Cu₂O/C and CuO–Cu₂O/C materials having active Cu phases with a high surface area and pore volume for efficient and sustainable catalysis.

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13

PRODI, A., A. GAUZZI, E. GILIOLI, F. LICCI, M. MAREZIO, F. BOLZONI, G. ALLODI et al. "CORRELATION BETWEEN LOCAL OXYGEN DISORDER AND ELECTRONIC PROPERTIES IN SUPERCONDUCTING RESR2CU3O6+X(RE = Y, YB)". International Journal of Modern Physics B 17, n. 04n06 (10 marzo 2003): 873–78. http://dx.doi.org/10.1142/s0217979203016753.

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This work aims at understanding the large reduction of superconducting critical temperature Tc observed in YSr 2 Cu 3 0 6+x as compared to its YBa 2 Cu 3 O 6+x counterpart (ΔTc = -30 K ). We report on a combined study of structural and electronic properties of RESr 2 Cu 3 O 6+x(RE = Y, Yb) polycrystalline samples. Neutron diffraction data and Cu NQR spectra show that, contrary to REBa 2 Cu 3 O 6+x RESr 2 Cu 3 O 6+x is locally tetragonal and no CuO chains are formed. This arises from the random occupancy of oxygen along the a- or b- direction in the basal planes. Ab-initio calculations of the electronic structure using the full-potential linearized-augmented-plane-wave method (FLAPW) in the local density approximation (LDA) suggest that the CuO chains are not formed because of the large elastic strain associated with the orthorhombic distortion produced by the chain formation. In addition, by using a [Formula: see text] supercell simulating the absence of chains, we find that oxygen disorder greatly alters the band structure near the Fermi level. Our analysis indicates that this alteration leads to a reduction of hole transfer from the CuO chains to the CuO 2 planes, which accounts for the reduction of Tc experimentally observed.

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14

OGUSHI, T., S. KOBA, M. HIROSE, S. HIGO, I. KAWANO e A. NAKAO. "METAL-INSULATOR TRANSITION OF CuO IN YBCO/CuO/YBCO JUNCTION". Modern Physics Letters B 09, n. 17 (20 luglio 1995): 1069–74. http://dx.doi.org/10.1142/s0217984995001054.

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A resistive transition of CuO sandwiched with Y 1 Ba 2 Cu 3 O 7–δ films has been studied. It shows a zero resistive transition around the critical temperature of Y 1 Ba 2 Cu 3 O 7–δ. The metal-insulator (or high resistivity) transition has been observed for thicker samples depending on the measuring current.

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15

Duan, Rudi, Weibin Chen, Ziwei Chen, Jialiang Gu, Zhaoqi Dong, Beini He, Lili Liu e Xidong Wang. "Mechanistic and Experimental Study of the CuxO@C Nanocomposite Derived from Cu3(BTC)2 for SO2 Removal". Catalysts 12, n. 7 (24 giugno 2022): 689. http://dx.doi.org/10.3390/catal12070689.

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A tunable and efficient strategy was adopted to synthesize highly porous nano-structured CuO−carbonized composites (CuxO@C) using Cu3(BTC)2 as a sacrificial template. The as-synthesized CuO nanocomposites exhibited hollow octahedral structures, a large surface area (89.837 m2 g−1) and a high proportion of Cu2O active sites distributed on a carbon frame. Based on DFT calculations, both the Cu atoms on the surface (CuS) and oxygen vacancy (OV) exhibited strong chemical reactivity. On the perfect CuO (111), the CuS transferred charge to O atoms on the surface and SO2 molecules. A strong adsorption energy (−1.41 eV) indicated the existence of the chemisorption process. On the oxygen-deficient CuO (111), the O2 preferably adsorbed on OV and then formed SO3 by bonding with SO2, followed by the cleavage of the O−O bond. Furthermore, the CuO nanocomposites exhibited an excellent ratio of S/Cu in SO2 removal experiments compared with CuO nanoparticles produced by coprecipitation.

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16

Juodkazytė, Jurga, Kȩstutis Juodkazis, Ieva Matulaitienė, Benjaminas Šebeka, Irena Savickaja, Armandas Balčytis, Yoshiaki Nishijima, Gediminas Niaura e Saulius Juodkazis. "Hydrogen Evolution on Nano-StructuredCuO/Pd Electrode: Raman Scattering Study". Applied Sciences 9, n. 24 (5 dicembre 2019): 5301. http://dx.doi.org/10.3390/app9245301.

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In this study, the processes taking place on the surfaces of nanostructured Cu/CuO and Cu/CuO/Pd electrodes at different potential, E, values in the solutions of 0.1 M KOH in H 2 O and D 2 O (heavy water) were probed by surface enhanced Raman spectroscopy (SERS), and the analysis of electrochemical reactions occurring under experimental conditions is presented. The bands of the SERS spectra of the Cu/CuO/Pd electrode observed in the range of E values from +0.3 V to 0 V (standard hydrogen electrode (SHE)) at 1328–1569 cm − 1 are consistent with the existence of species that are adsorbed or weakly bound to the surface with the energy of interaction close to 15–21 kJ mol − 1 . These bands can be attributed to the ad(ab)sorbed (H 3 O + ) ad , (H 2 + ) ab , and (H 2 + ) ad ions as intermediates in reversible hydrogen evolution and oxidation reactions (HER/HOR) taking place on the Cu/CuO/Pd electrode. There was no isotopic effect observed; this is consistent with the dipole nature of the electron-ion pair formation of adsorbed (H 3 O + ) ad and (H 2 + ) ad or (D 3 O + ) ad and (D 2 + ) ad . In accordance with the literature data, SERS bands at 125–146 cm − 1 and ∼520–565 cm − 1 were assigned to Cu(I) and Cu(II) oxygen species. These findings corroborate the quantitative stepwise mechanism of water reduction.

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17

HE, PING, XIAOLONG PENG, ZHONGZHI ZHANG, JIANG WU, NAICHAO CHEN e JIANXING REN. "DENSITY FUNCTIONAL STUDY OF ELEMENTAL MERCURY ADSORPTION ON X (X=Mn, Si, Ti, Al, AND Zn)-DOPED CuO (110) SURFACE". Surface Review and Letters 24, n. 08 (dicembre 2017): 1750119. http://dx.doi.org/10.1142/s0218625x17501190.

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Copper oxide (CuO) is proved to be a potential adsorbent for elemental mercury in the flue gas emitted from coal-fired power plant. However, the O-terminated CuO(110) surface has relatively week adsorption capacity for Hg. In this work, the doped method is applied to enhance the mercury adsorption capacity of O-terminated CuO(110). Mn, Si, Ti, Al and Zn are selected as the doped atom. It is found that only Zn-doped CuO (110) surfaces have the higher adsorption energy than the pure O-terminated CuO(110) surface. The mercury adsorption capacity is a complex issue, which depends on a combination of oxygen and doped element. The results suggest that the lower electropositive doped element is favorable for the improvement of mercury adsorption capacity. However, the lower electronegativity of oxygen atoms does not facilitate the mercury capture, which is different from the organic material. Cu and doped metal element, rather than oxygen atom, mainly determine mercury adsorption capacity of O-terminated CuO(110) surface, which leads to the lower adsorption capacity of the O-terminated CuO(110) surface than the Cu-terminated CuO(110) surface. The conclusions can also offer a valuable reference for the other metal oxide regarding mercury capture.

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18

Sasmal, Anup Kumar, Soumen Dutta e Tarasankar Pal. "A ternary Cu2O–Cu–CuO nanocomposite: a catalyst with intriguing activity". Dalton Transactions 45, n. 7 (2016): 3139–50. http://dx.doi.org/10.1039/c5dt03859f.

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DOW, JOHN D., HOWARD A. BLACKSTEAD e DALE R. HARSHMAN. "THE CASE AGAINST CUPRATE-PLANE SUPERCONDUCTIVITY". International Journal of Modern Physics B 14, n. 29n31 (20 dicembre 2000): 3444–50. http://dx.doi.org/10.1142/s0217979200003939.

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Significant elements in the case for high-temperature superconductivity originating in the charge-reservoir layers are presented, including: (i) the successful predictions that PrBa 2 Cu 3 O 7, Gd 1.6 Ce 0.4 Sr 2 Cu 2 TiO 10, Pr 1.5 Ce 0.5 Sr 2 Cu 2 NbO 10, and Eu 1.5 Ce 0.5 Sr 2 Cu 2 TiO 10 all superconduct; (ii) the fact that muons stopped in the SrO layers of Sr 2 YRu 1-u Cu u O 6 detected flux expulsion, (iii) the observed superconductivity of PrBa 2 Cu 3 O 7 when its c-axis lattice constant is longer than 11.77 Å, and (iv) the failure of Gd 2-z Ce z CuO 4, Cm 2-z Th z CuO 4, and Ba 2 GdRu 1-u Cu u O 6 to superconduct.

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Dai, Yanhui, Jian Zhao, Xiaoyun Liu, Xiaoyu Yu, Zhixiang Jiang, Yuyu Bu, Zefeng Xu, Zhenyu Wang, Xiaoshan Zhu e Baoshan Xing. "Transformation and species identification of CuO nanoparticles in plant cells (Nicotiana tabacum)". Environmental Science: Nano 6, n. 9 (2019): 2724–35. http://dx.doi.org/10.1039/c9en00781d.

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Chang, Chun-Chih, Elise Y. Li e Ming-Kang Tsai. "A computational exploration of CO2 reduction via CO dimerization on mixed-valence copper oxide surface". Physical Chemistry Chemical Physics 20, n. 25 (2018): 16906–9. http://dx.doi.org/10.1039/c8cp00592c.

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Fadlly, Teuku Andi, e Rachmad Almi Putra. "CURRENT-VOLTAGE CHARACTERISTICS OF SOLAR CELLS p-n JUNCTION ZnO AND TiO2 PARAREL ON Cu2O LAYER". Jurnal Neutrino 12, n. 1 (30 gennaio 2020): 1. http://dx.doi.org/10.18860/neu.v12i1.7578.

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Current-Voltage Characteristics of solar cells p-n junction ZnO and TiO<sub>2</sub> parallel in the Cu<sub>2</sub>O layer has been determined using solar irradiation. Metal oxide has been used as a semiconductor material, such as ZnO and TiO<sub>2</sub> is an n-type semiconductor. The material has a gap energy of 3.37 eV and 3.2 eV. Thermal oxidation is applied to commercial Cu plates for 60 minutes to produce Cu<sub>2</sub>O layers as p-type semiconductors. The process varies in temperature, namely 300, 400, and 500 °C. The process of thermal oxidation on Cu plates at a temperature of 300 °C increases the impurity in the Cu<sub>2</sub>O layer. The impurity layer is CuO. Then the CuO layer formed decreases with increasing temperature thermal oxidation. CuO layer increases the efficiency of solar cells p-n junction TiO<sub>2</sub>-ZnO parallel in the layer Cu<sub>2</sub>O. The results of measurements with sunlight showed that the TiO<sub>2</sub>-ZnO/Cu<sub>2</sub>O (300) samples had the highest solar cell efficiency, which was 0.28 %.

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Guo, Mu Yao, Fangzhou Liu, Jenkin Tsui, Albert A. Voskanyan, Alan Man Ching Ng, Aleksandra B. Djurišić, Wai Kin Chan et al. "Hydrothermally synthesized CuxO as a catalyst for CO oxidation". Journal of Materials Chemistry A 3, n. 7 (2015): 3627–32. http://dx.doi.org/10.1039/c4ta06804a.

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WEN, SHULIN. "MECHANISM OF SOLID STATE REACTION FROM 2212 TO 2223 IN BSCCO STUDIED BY HREM". Modern Physics Letters B 05, n. 08 (10 aprile 1991): 597–606. http://dx.doi.org/10.1142/s0217984991000721.

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Two mechanisms of solid state reaction from 2212 to 2223 in Bi-Sr-Ca-Cu-O have been investigated and are elucidated in this paper. The first mechanism is related to nucleation of 2223 phase in a liquid matrix with the composition of Bi 2 SrCaCu 2 O +Ca 2 CuO 3+ CuO and subsequent growth. The second mechanism is related to intragrain reaction in which only two layers of atoms (a Ca layer and a CuO layer) are required to move into the 2212 structure forming the 2223 structure. To study the mechanisms of such a solid state reaction may be very important for the preparation of pure 2223 phase in Bi-Sr-Ca-Cu-O .

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TATARCHENKO, V. A., G. A. EMEL'CHENKO, N. V. ABROSIMOV, V. A. BORODIN, L. Ya. VINNIKOV, O. V. ZHARIKOV, A. A. ZHOKHOV et al. "SINGLE CRYSTAL GROWTH OF HIGH TEMPERATURE SUPERCONDUCTORS AND INVESTIGATION OF THEIR PHYSICAL PROPERTIES". International Journal of Modern Physics B 03, n. 02 (febbraio 1989): 289–302. http://dx.doi.org/10.1142/s0217979289000221.

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Part of the phase diagram of the La 2 O 3- CuO system has been studied and single crystals of La 2 CuO 4, (LaSr) 2 CuO 4 (up to 20 × 8 × 6 mm 3), YBa 2 Cu 3 O 7−δ (up to 8 × 6 × 0.1 mm 3) and HoBa 2 Cu 3 O 7-(up to 3 × 2.5 × 1 mm 3) have been grown by the method of spontaneous crystallisation, using a rotational crucible. It has been established that thermal treatment of "123" single crystals under oxygen pressure to 10 bars improves their superconducting properties. Electrical, magnetic, optical properties, and the real structure of the single crystals produced have been studied.

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Gao, J., W. H. Tang e T. C. Chui. "A NOVEL BUFFER LAYER FOR GROWING ULTRATHIN FILMS OF YBa2Cu3Oy ON YSZ SUBSTRATES". International Journal of Modern Physics B 13, n. 29n31 (20 dicembre 1999): 3660–62. http://dx.doi.org/10.1142/s0217979299003623.

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A new buffer material Nd 2 CuO 4 has been used to improve the initial epitaxy of YBa 2 Cu 3 O y, on yttrium stabilized ZrO 2. By using Nd 2 CuO 4 as a buffer layer, the epitaxy and crystallinity of the grown YBa 2 Cu 3 O y, have been significantly enhanced. High quality superconducting thin and ultrathin films with a thickness down to two unit cells have been obtained.

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Muthukumar, Pandi, Mehboobali Pannipara, Abdullah G. Al-Sehemi e Savarimuthu Philip Anthony. "Highly enhanced bifunctional electrocatalytic activity of mixed copper–copper oxides on nickel foam via composition control". New Journal of Chemistry 44, n. 28 (2020): 11993–2001. http://dx.doi.org/10.1039/d0nj02311f.

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NISHIZAKI, TERUKAZU, NORIO KOBAYASHI e MAKOTO MAKI. "STM STUDIES OF ELECTRONIC ORDER IN THE UNDERDOPED SURFACE OF YBa2Cu3Oy". International Journal of Modern Physics B 21, n. 18n19 (30 luglio 2007): 3199–201. http://dx.doi.org/10.1142/s0217979207044184.

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To study the nanoscale electronic order in high-T c superconductors, we have performed low-temperature scanning tunneling microscopy (STM) experiments on YBa 2 Cu 3 O y, single crystals. The electronic state of the underdoped CuO 2 plane is studied through the BaO surface taking advantage of the cleaved surface, which has an insufficient carrier doping into the topmost CuO 2 plane because of the incomplete carrier reservoir. The STM image measured at low bias-voltage below 20 mV shows the one-dimensional (1D) electronic modulation along the Cu - O bonds. The 1D modulation do not have long-range order and the periodicity varies within the range ~ 2a - 4a depending on the position on the surface. These results indicate that electronic order in underdoped YBa 2 Cu 3 O y, differs from the 4a×4a checkerboard structure observed in Bi 2 Sr 2 CaCu 2 O y and Ca 2-x Na x CuO 2 Cl 2.

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29

Chen, Chunjun, Xiaofu Sun, Xupeng Yan, Yahui Wu, Mingyang Liu, Shuaishuai Liu, Zhijuan Zhao e Buxing Han. "A strategy to control the grain boundary density and Cu+/Cu0 ratio of Cu-based catalysts for efficient electroreduction of CO2 to C2 products". Green Chemistry 22, n. 5 (2020): 1572–76. http://dx.doi.org/10.1039/d0gc00247j.

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Abstract (sommario):

Cu(OH)₂/CuO nanocomposite-derived Cu₂O/Cu achieves a total faradaic efficiency for C2 products of 65% via tuning the grain boundary density and Cu⁺/Cu⁰ ratio.

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30

Vinod Kumar, V., A. Dharani, Mariappan Mariappan e Savarimuthu Philip Anthony. "Synthesis of CuO and Cu2O nano/microparticles from a single precursor: effect of temperature on CuO/Cu2O formation and morphology dependent nitroarene reduction". RSC Advances 6, n. 88 (2016): 85083–90. http://dx.doi.org/10.1039/c6ra16553b.

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Abstract (sommario):

CuO and Cu₂O micro/nanoparticles have been synthesized from same precursor in hydrothermal method by controlling temperature and morphology dependent nitroarenes reduction was studied with CuO nano/microparticles.

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31

Hu, Pu, Maxim Dorogov, Yan Xin e Katerina E. Aifantis. "Transforming Single‐Crystal CuO/Cu 2 O Nanorods into Nano‐Polycrystalline Cu/Cu 2 O through Lithiation". ChemElectroChem 6, n. 12 (14 giugno 2019): 3139–44. http://dx.doi.org/10.1002/celc.201900564.

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32

TOPAL CANBAZ, Gamze. "Green Synthesis of CuO Nanoparticles Using Tragopogon porrifolius and Their Antioxidant and Photocatalytic Applications". Cumhuriyet Science Journal 44, n. 4 (28 dicembre 2023): 671–77. http://dx.doi.org/10.17776/csj.1329389.

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Abstract (sommario):

Copper oxide nanoparticles (CuO NPs) were produced by green synthesis method which is a cheap, easy and effective method using Tragopogon porrifolius extract. The shape, bond and crystal structure of the nanoparticles were determined by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) and X-ray diffractometer (XRD) analysis methods. SEM analysis showed that the particles were spherical and EDX analysis showed the elemental composition of Cu and O as Cu 58.17 % and O 32.73 %. Cu-O bond structure was identified in FTIR analysis. In XRD analysis, peaks defining CuO NPs were observed. The antioxidant and photocatalytic activity of the synthesized CuO NPs were investigated. Antioxidant capacities were examined in the range of 50-500 μg/mL. The free radical scavenging activity of the nanoparticles was determined as 70.75 % at a concentration of 500 μg/mL. In photocatalytic studies, Reactive Red 120 (RR 120) dye degradation was investigated. The degradation time was calculated as 76 % in 30 min.

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33

Billinge, Simon J. L., Matthias Gutmann e Emil S. Božin. "Structural Response to Local Charge Order in Underdoped but Superconducting La2-x(Sr,Ba)xCuO4". International Journal of Modern Physics B 17, n. 18n20 (10 agosto 2003): 3640–47. http://dx.doi.org/10.1142/s021797920302154x.

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Abstract (sommario):

Results are presented of a local structural study of the nearest neighbor Cu–O distance distribution in underdoped but superconducting La 1.875 Sr 0.125 CuO 4, La 1.85 Ba 0.15 CuO 4 and La 1.85 Sr 0.15 CuO 4. Atomic pair distribution function analysis of neutron powder diffraction data has been carried out to obtain local structural information over a wide temperature range. We observe an anomalous increase in the Cu–O bond length distribution at low temperature that may be associated with the presence of an inhomogeneous charge distribution. The increase at low temperature has an onset temperature which correlates with observations of charge and spin freezing seen by other probes.

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34

Sasvári, J., S. Pekker, A. Csordás Tóth, Gy Hutiray e L. Mihály. "SUPERCONDUCTING AND MINOR PHASES IN Bi-Sr-Ca-Cu-O SYSTEM". International Journal of Modern Physics B 02, n. 05 (ottobre 1988): 1241–48. http://dx.doi.org/10.1142/s0217979288001098.

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Abstract (sommario):

Ceramics of various nominal composition in the Bi-Sr-Ca-Cu-O system were studied by X-ray powder diffraction and electron beam microanalysis. Electrical resistivity measurements were also carried out. Efforts were made to prepare various phase compositions in the Bi-Sr-Ca-Cu-O system, such as the Bi 2 Sr 2 Ca 2 Cu 3 O 10 (from now on we use the commonly accepted composition denotion by cation stoichiometry, here 2223), 2212 and 2201, with T c = 110 K , 70 K and 20 K, respectively. Experiments included higher calcium ratio samples such as the 4334 and related compositions. All studied samples contained minor phases besides the main ones. However, their amount of minor phases was below the detectability limit (~3 %) of the X-ray diffractometry. Presence of CuO was shown by electron beam microanalysis. Ca 2 CuO 3, Sr y Ca 2−y CuO 3 ( y ≤ 0.2) and Bi-rich phases were very often detected. In this paper, X-ray patterns of the phases with caracteristic composition are given together with the results of electrical resistivity measurements.

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35

Zou, Xinwei, Huiqing Fan, Yuming Tian, Mingang Zhang e Xiaoyan Yan. "Chemical bath deposition of Cu2O quantum dots onto ZnO nanorod arrays for application in photovoltaic devices". RSC Advances 5, n. 30 (2015): 23401–9. http://dx.doi.org/10.1039/c4ra13776k.

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Abstract (sommario):

A protective CuO layer on the Cu₂O quantum dots was prepared by simply heat-treating the Cu₂O/ZnO hetero-nanorod arrays in ambient air, which enhances the photovoltaic stability.

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36

Chen, Kunfeng, e Dongfeng Xue. "Cu-based materials as high-performance electrodes toward electrochemical energy storage". Functional Materials Letters 07, n. 01 (febbraio 2014): 1430001. http://dx.doi.org/10.1142/s1793604714300011.

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Abstract (sommario):

Cu -based materials, including metal Cu and semiconductors of Cu 2 O and CuO , are promising and important candidates toward practical electrochemical energy storage devices due to their abundant, low cost, easy synthesis and environmentally friendly merits. This review presents an overview of the applications of Cu -based materials in the state-of-art electrochemical energy storage, including both lithium-ion batteries and supercapacitors. The synthesis chemistry, structures and the corresponding electrochemical performances of these materials are summarized and compared. During chemical synthesis and electroactive performance measurement of Cu -based materials, we found that Cu – Cu 2 O – CuO sequence governs all related transformations. Novel water-soluble CuCl 2 supercapacitors with ultrahigh capacitance were also reviewed which can advance the understanding of intrinsic mechanism of inorganic pseudocapacitors. The major goal of this review is to highlight some recent progresses in using Cu -based materials for electrochemical energy storage.

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37

Zhai, Yanzhao, Yongjun Ji, Guangna Wang, Yongxia Zhu, Hezhi Liu, Ziyi Zhong e Fabing Su. "Controllable wet synthesis of multicomponent copper-based catalysts for Rochow reaction". RSC Advances 5, n. 89 (2015): 73011–19. http://dx.doi.org/10.1039/c5ra10999j.

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38

Ye, Lin, e Zhenhai Wen. "Self-supported three-dimensional Cu/Cu2O–CuO/rGO nanowire array electrodes for an efficient hydrogen evolution reaction". Chemical Communications 54, n. 49 (2018): 6388–91. http://dx.doi.org/10.1039/c8cc02510j.

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39

Wang, Minjun, Shixiong Zhang, Ming Xia e Mengke Wang. "A Theoretical Study of the Oxygen Release Mechanisms of a Cu-Based Oxygen Carrier during Chemical Looping with Oxygen Uncoupling". Catalysts 12, n. 3 (15 marzo 2022): 332. http://dx.doi.org/10.3390/catal12030332.

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Abstract (sommario):

The Cu-based oxygen carrier is a promising material in the chemical looping with oxygen uncoupling (CLOU) process, while its performance in the CLOU is significantly dependent on the oxygen release properties. However, the study of oxygen release mechanisms in CLOU is not comprehensive enough. In this work, the detailed oxygen release mechanisms of CuO(110) and CuO(111) are researched at an atomic level using the density functional theory (DFT) method, including the formation of O2, the desorption of O2 and the diffusion of O anion, as well as the analysis of the density of states. The results show that (1) the most favorable pathway for O2 formation and desorption occurs on the CuO(110) surface of O-terminated with energy barriers of 1.89 eV and 3.22 eV, respectively; (2) the most favorable pathway for O anion diffusion occurs in the CuO(110) slab with the lowest energy barrier of 0.24 eV; and (3) the total density of states for the O atoms in the CuO(110) slab shifts to a lower energy after an O vacancy formation. All of the above results clearly demonstrate that the CuO(110) surface plays a significantly important role in the oxygen release reaction, and the oxygen vacancy defect should be conducive to the reactivity of oxygen release in a Cu-based oxygen carrier.

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40

LUCACEL, R. CICEO, e I. ARDELEAN. "EPR AND MAGNETIC SUSCEPTIBILITY STUDIES OF COPPER IONS IN THE 2B2O3·Ag2O GLASS MATRIX". International Journal of Modern Physics B 18, n. 20n21 (30 agosto 2004): 2915–21. http://dx.doi.org/10.1142/s0217979204026159.

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Abstract (sommario):

Glasses of the x CuO ·(100-x)[2 B 2 O 3· Ag 2 O ] system, with 0<x≤30 mol %, were investigated by means of EPR and magnetic susceptibility measurements. The influence of a gradual increase in CuO content on the glass structure and magnetic interactions that involved copper ions, have been discussed. EPR absorption spectra show Cu 2+ ions in axially distorted octahedral environments. Both EPR and magnetic measurements data pointed out the simultaneous presence in the glasses with x>5 mol % of Cu 2+ and Cu + ionic species. The Curie behavior of magnetic susceptibility indicates the absence of the superexchange interactions in these glasses.

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41

Zhao, Han, Hongcheng Li, Yongwan Gu, Tingting Zheng, Depeng Zhao, Wenzheng Xia, Yunkun Zhao e Hangrong Chen. "La2O2CO3-Induced phase composition oscillation in La–Cu mixed oxides during repeated catalytic soot combustion". Catalysis Science & Technology 9, n. 18 (2019): 5100–5110. http://dx.doi.org/10.1039/c9cy01061k.

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Abstract (sommario):

La₂O₂CO₃-Induced phase composition oscillation between phase 1 (CuO + La₂O₂CO₃) and phase 2 (La₂CuO₄) in La–Cu mixed oxides during repeated catalytic soot combustion.

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42

Yang, Siyuan, Shengsen Zhang, Hongjuan Wang, Hao Yu, Yueping Fang e Feng Peng. "Facile synthesis of self-assembled mesoporous CuO nanospheres and hollow Cu2O microspheres with excellent adsorption performance". RSC Adv. 4, n. 81 (2014): 43024–28. http://dx.doi.org/10.1039/c4ra07593e.

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43

NOWIK, ISRAEL, e ISRAEL FELNER. "COMPETITION BETWEEN SUPERCONDUCTIVITY AND ANTIFERROMAGNETISM". Modern Physics Letters B 05, n. 04 (20 febbraio 1991): 273–75. http://dx.doi.org/10.1142/s0217984991000319.

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Abstract (sommario):

The competition between superconductivity and Cu antiferromagnetism in the high Tc, Cu containing superconductors, ( R 1−x M x)2 CuO 4, RBa 2 Cu 3 O 7, Bi 2 Sr 2 CaCu 2 O 8 and YBa 2 Cu 4O8 is reviewed. Partial substitution of some of the ions suppresses superconductivity and leads to the establishment of antiferromagnetic order in the Cu layers.

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44

Wang, Liying, Kalyani Gupta, Josephine B. M. Goodall, Jawwad A. Darr e Katherine B. Holt. "In situ spectroscopic monitoring of CO2 reduction at copper oxide electrode". Faraday Discussions 197 (2017): 517–32. http://dx.doi.org/10.1039/c6fd00183a.

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Abstract (sommario):

Copper oxide modified electrodes were investigated as a function of applied electrode potential using in situ infrared spectroscopy and ex situ Raman and X-ray photoelectron spectroscopy. In deoxygenated KHCO₃ electrolyte bicarbonate and carbonate species were found to adsorb to the electrode during reduction and the CuO was reduced to Cu(i) or Cu(0) species. Carbonate was incorporated into the structure and the CuO starting material was not regenerated on cycling to positive potentials. In contrast, in CO₂ saturated KHCO₃ solution, surface adsorption of bicarbonate and carbonate was not observed and adsorption of a carbonato-species was observed with in situ infrared spectroscopy. This species is believed to be activated, bent CO₂. On cycling to negative potentials, larger reduction currents were observed in the presence of CO₂; however, less of the charge could be attributed to the reduction of CuO. In the presence of CO₂ CuO underwent reduction to Cu₂O and potentially Cu, with no incorporation of carbonate. Under these conditions the CuO starting material could be regenerated by cycling to positive potentials.

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45

CALLEGARI, AGNESE, ENRICO PERFETTO, GIANLUCA STEFANUCCI e MICHELE CINI. "INTERPLANAR HOPPING OF W = 0 BOUND PAIRS". International Journal of Modern Physics B 17, n. 04n06 (10 marzo 2003): 567–72. http://dx.doi.org/10.1142/s0217979203016248.

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Abstract (sommario):

CuO 4 is the simplest of a class of repulsive Hubbard model clusters which (under well specified conditions) display W = 0 pairing; remarkably, ane also observes superconducting quantization of a magnetic flux orthogonal to the plane. Thus one can use CuO 4 units connected by weak O-O and/or Cu-Cu links to model interplanar coupling and c-axis superconductivity in Cuprates. A new analytic approximation supported by preliminary numerical evidence suggests that in such models one can study the propagation of bound pairs and also the superconducting flux quantization in a 3d geometry.

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46

Liu, Jinxiang, Yinchuan Chang, Xiuyu Shao, Ning Cao, Zhanguo Duan, Xiaodong Zou, Hui Fan et al. "SUPERCONDUCTIVITY IN Y(BAxSR1−x)CUO SYSTEM". International Journal of Modern Physics B 01, n. 02 (giugno 1987): 245–48. http://dx.doi.org/10.1142/s0217979287000256.

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Abstract (sommario):

A number of samples with the nominal formula Y 0.4( Ba x Sr 1−x)0.6 Cu O 3, Y 0.5( Ba x Sr 1−x)0.5 CuO 3 and Y 1.2 ( Ba x Sr 1−x)0.8 CuO 4 have been made. It is found that for x=0 the samples show no superconductivity but for x>0.008 samples do show superconductivity, and for x=0.008, 0.005 the samples have high normal resistivity and no resistive transition but show diamagnetism at about 70k. The structure analysis find a smaller distortion in the the sample Y 0.5( Ba 0.01 Sr 0.99)0.5 CuO 3 than that in YBa 2 Cu 3 O 9−y. The relation between superconductivity and the ionic radius is discussed.

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47

Wang, Yiting, Yinyun Lü, Wenwen Zhan, Zhaoxiong Xie, Qin Kuang e Lansun Zheng. "Synthesis of porous Cu2O/CuO cages using Cu-based metal–organic frameworks as templates and their gas-sensing properties". Journal of Materials Chemistry A 3, n. 24 (2015): 12796–803. http://dx.doi.org/10.1039/c5ta01108f.

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Abstract (sommario):

Porous Cu₂O/CuO polyhedral cages with excellent gas-sensing properties were successfully fabricated by thermal decomposition of Cu-based metal–organic frameworks composed of polyhedral crystals.

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48

Jia, He, Haitao Gao, Shilin Mei, Janosch Kneer, Xianzhong Lin, Qidi Ran, Fuxian Wang, Stefan Palzer e Yan Lu. "Cu2O@PNIPAM core–shell microgels as novel inkjet materials for the preparation of CuO hollow porous nanocubes gas sensing layers". Journal of Materials Chemistry C 6, n. 27 (2018): 7249–56. http://dx.doi.org/10.1039/c8tc01995a.

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Abstract (sommario):

CuO porous hollow sensing layers can be easily formed by heating Cu₂O@PNIPAM printed layers, which show faster response to relevant trace NO₂ gases than sensors produced from bare Cu₂O nanocubes.

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49

Na, Yulyi, Sung Woo Lee, Nitish Roy, Debabrata Pradhan e Youngku Sohn. "Room temperature light-induced recrystallization of Cu2O cubes to CuO nanostructures in water". CrystEngComm 16, n. 36 (2014): 8546–54. http://dx.doi.org/10.1039/c4ce01174k.

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Abstract (sommario):

Visible light irradiation induces recrystallization of Cu₂O cubes to [010] growth-directed CuO nanoribbons in water due to the creation of active ˙OH and ˙O₂⁻ species and outward Cu diffusion along unstable {010} facets.

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50

Trivedi, Manoj, Sanjeev kumar Ujjain, Raj Kishore Sharma, Gurmeet Singh, Abhinav Kumar e Nigam P. Rath. "A cyano-bridged copper(ii)–copper(i) mixed-valence coordination polymer as a source of copper oxide nanoparticles with catalytic activity in C–N, C–O and C–S cross-coupling reactions". New J. Chem. 38, n. 9 (2014): 4267–74. http://dx.doi.org/10.1039/c4nj00829d.

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