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Journal articles on the topic '5-CuO'

Author: Grafiati
Published: 4 June 2021
Last updated: 5 February 2022

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1

Frerichs, D., and Hk Müller-Buschbaum. "Vier verschiedene Koordinationspolyeder um Cu2+ im Oxid-Arsenat-Phosphat CuO(Cu,Mg)3(As1–xPxO4)2 (x = 0,3) / Four Different Coordination Polyhedra Around Copper in the Oxide-Arsenate-Phosphate CuO(Cu,Mg)3(As1-xPxO4)2 (x = 0,3)." Zeitschrift für Naturforschung B 51, no. 1 (January 1, 1996): 25–28. http://dx.doi.org/10.1515/znb-1996-0106.

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Abstract Single crystals of CuO(Cu,Mg)3[(As0.7P0.3)O4]2 have been prepared by crystallization from melts. The compound crystallizes with triclinic symmetry, space group Ci1-P1̄, a = 6.372(4), b = 7.643(7), c = 8.175(5) Å, α = 98.59(6), β = 112.26(3), γ = 99.03(3)°, Z = 2. CuO(Cu,Mg)3[(As0.7P0.3)O4]2 is isotypic to Cu4(PO4)2O . X-ray investigations show square planar CuO4 polygons, twisted tetragonal CuO5 pyramids, CuO5 bipyramids and elongated (Cu,Mg)O6 octahedra.
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2

Kong, Wusong, Hongxia Qu, Peng Chen, Weihua Ma, and Huifang Xie. "Property of Cu2O-CuO/ZSM-5 nanocomposite and degradation process of azo dye AO7 without sacrificial agent (H2O2)." Water Science and Technology 73, no. 11 (March 11, 2016): 2747–53. http://dx.doi.org/10.2166/wst.2016.138.

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In this study, Cu2O-CuO/ZSM-5 nanocomposite was synthesized by the impregnation method, and its catalytic performance for the destruction of AO7 in aqueous solutions was investigated. The morphology, structure and surface element valence state of Cu2O-CuO/ZSM-5 were characterized by transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The operating conditions on the degradation of AO7 by Cu2O-CuO/ZSM-5, such as initial pH values, concentration of AO7 and catalyst dosage were investigated and optimized. The results showed that the sample had good catalytic activity for destruction of AO7 in the absence of a sacrificial agent (e.g. H2O2): it could degrade 91% AO7 in 140 min at 25 °C and was not restricted by the initial pH of the AO7 aqueous solutions. Cu2O-CuO/ZSM-5 exhibited stable catalytic activity with little loss after three successive runs. The total organic carbon and chemical oxygen demand removal efficiencies increased rapidly to 69.36% and 67.3% after 120 min of treatment by Cu2O-CuO/ZSM-5, respectively.
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3

Alam, Mir Waqas, Farooq Ahmad Dar, Fida Mohmed, Abdullah Aljaafari, and Osama Saber. "Augmentation of ferromagnetism in CuO–Al2O3 nanocomposite synthesized via solution combustion method." Materials Express 9, no. 6 (September 1, 2019): 653–59. http://dx.doi.org/10.1166/mex.2019.1549.

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The finite size effect of CuO nanoparticles and their effect on the magnetic behavior of a CuO–Al2O3 nanocomposite synthesized via a solution combustion method are discussed here. It is observed that the introduction of CuO nanoparticles of ∼20 nm in size on the surfaces of Al2O3 nanosheets strongly influences the magnetic moment of the nanocomposite. The X-ray diffraction pattern reveals the presence of a CuO phase in the CuO–Al2O3 nanocomposite. Electron microscopy imaging shows the presence of CuO nanoparticles distributed over the surfaces of Al2O3 nanosheets. Magnetic measurements performed at 5 and 300 K revealed a strong enhancement in the saturation magnetization of the CuO–Al2O3 nanocomposite at both temperatures. This increase is due to the formation of CuO nanoparticles on the surfaces of the Al2O3 nanosheets. These CuO nanoparticles show a ferromagnetic nature due to the uncompensated surface Cu2+ spins of the copper ions. The presence of the Cu2+ state in the CuO nanoparticles in the CuO–Al2O3 nanocomposite was confirmed by X-ray photoelectron spectroscopy (XPS) measurements.
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4

Supakosl, Benjara, Vatcharinkorn Mekla, and Chakkaphan Raksapha. "Effect of Temperature and Synthesis of CuO Nanostructures on Cu Plate by Thermal Method." Advanced Materials Research 634-638 (January 2013): 2160–62. http://dx.doi.org/10.4028/www.scientific.net/amr.634-638.2160.

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CuO nanostructures were synthesized by thermal evaporation method using Cu metal plate in air at temperatures ranging from 400 to 600 C for 6 h. The CuO nanostructures were characterized by X-ray diffraction, XRD and field emission scanning electron microscopy, FE-SEM. X-ray diffraction, XRD pattern showed the bicrystal nanostructure of CuO and Cu2O. FE-SEM images indicated that the nanowires depended on temperatures. The diameter of Cuo nanowires varies from 10 nm to 20 nm and length of several 5 micrometers.
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5

Adamson, Sherleen Xue-Fu, Wei Zheng, Zeynep Sena Agim, Sarah Du, Sheila Fleming, Jonathan Shannahan, and Jason Cannon. "Systemic Copper Disorders Influence the Olfactory Function in Adult Rats: Roles of Altered Adult Neurogenesis and Neurochemical Imbalance." Biomolecules 11, no. 9 (September 6, 2021): 1315. http://dx.doi.org/10.3390/biom11091315.

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Disrupted systemic copper (Cu) homeostasis underlies neurodegenerative diseases with early symptoms including olfactory dysfunction. This study investigated the impact of Cu dyshomeostasis on olfactory function, adult neurogenesis, and neurochemical balance. Models of Cu deficiency (CuD) and Cu overload (CuO) were established by feeding adult rats with Cu-restricted diets plus ip. injection of a Cu chelator (ammonium tetrathiomolybdate) and excess Cu, respectively. CuD reduced Cu levels in the olfactory bulb (OB), subventricular zone (SVZ), rostral migratory stream (RMS), and striatum, while CuO increased Cu levels in these areas. The buried pellet test revealed both CuD and CuO prolonged the latency to uncover food. CuD increased neural proliferation and stem cells in the SVZ and newly differentiated neurons in the OB, whereas CuO caused opposite alterations, suggesting a “switch”-type function of Cu in regulating adult neurogenesis. CuO increased GABA in the OB, while both CuD and CuO reduced DOPAC, HVA, 5-HT and the DA turnover rate in olfactory-associated brain regions. Altered mRNA expression of Cu transport and storage proteins in tested brain areas were observed under both conditions. Together, results support an association between systemic Cu dyshomeostasis and olfactory dysfunction. Specifically, altered adult neurogenesis along the SVZ-RMS-OB pathway and neurochemical imbalance could be the factors that may contribute to olfactory dysfunction.
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6

Yang, Yuran, Can Zhang, Xuejiao Huang, Xuwei Gui, Yifang Luo, and Zhenlun Li. "Exogenous Fe2+ alleviated the toxicity of CuO nanoparticles on Pseudomonas tolaasii Y-11 under different nitrogen sources." PeerJ 8 (November 10, 2020): e10351. http://dx.doi.org/10.7717/peerj.10351.

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Extensive use of CuO nanoparticles (CuO-NPs ) inevitably leads to their accumulation in wastewater and toxicity to microorganisms that effectively treat nitrogen pollution. Due to the effects of different mediums, the sources of CuO-NPs-induced toxicity to microorganisms and methods to mitigating the toxicity are still unclear. In this study, CuO-NPs were found to impact the nitrate reduction of Pseudomonas tolaasii Y-11 mainly through the action of NPs themselves while inhibiting the ammonium transformation of strain Y-11 through releasing Cu2+. As the content of CuO-NPs increased from 0 to 20 mg/L, the removal efficiency of NO3− and NH4+ decreased from 42.29% and 29.83% to 2.05% and 2.33%, respectively. Exogenous Fe2+ significantly promoted the aggregation of CuO-NPs, reduced the possibility of contact with bacteria, and slowed down the damage of CuO-NPs to strain Y-11. When 0.01 mol/L Fe2+ was added to 0, 1, 5, 10 and 20 mg/L CuO-NPs treatment, the removal efficiencies of NO3- were 69.77%, 88.93%, 80.51%, 36.17% and 2.47%, respectively; the removal efficiencies of NH4+ were 55.95%, 96.71%, 38.11%, 20.71% and 7.43%, respectively. This study provides a method for mitigating the toxicity of CuO-NPs on functional microorganisms.
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7

Puchert, M. K., A. Hartmann, R. N. Lamb, and J. W. Martin. "Highly resistive sputtered ZnO films implanted with copper." Journal of Materials Research 11, no. 10 (October 1996): 2463–69. http://dx.doi.org/10.1557/jmr.1996.0310.

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Polycrystalline (0001)-oriented thin films of ZnO (thickness 120 nm) were deposited by rf magnetron sputtering and post-deposition annealed at 500 °C in oxygen (1 atm). The films were subsequently implanted with copper at doses over the range 1016 to 1017 ions/cm2. X-ray diffraction (XRD) indicates the compressive intrinsic film stress is largely relieved by the preimplantation anneal, and does not change when implanted or when further annealed after implantation, suggesting that the dominant cause of intrinsic stress is the atomic packing density rather than the crystallographic defect density. Resistivity measurements indicate that annealing of pure ZnO films causes the perpendicular resistivity to increase from 1.3 × 105 Ω · cm to 5 × 1010 Ω · cm. Copper implantation results in a lower resistivity of the order of 107 Ω · cm, but subsequent annealing actually increases resistivity beyond that of annealed nonimplanted ZnO to 3 × 1012 Ω · cm. It is proposed that copper increases the resistivity of those annealed films by trapping free electrons with the Cu 3d hole state occurring in CuO (formed predominantly during annealing). In order to check this, the oxidation state of the implanted copper was studied before and after annealing by x-ray photoelectron spectroscopy (XPS) and extended x-ray absorption fine structure (EXAFS). Three oxidation states of copper (Cu0, Cu1+, Cu2+) are detected in the implanted films, and postimplantation annealing results in oxidation of copper to the Cu2+ state, confirming that the presence of CuO in ZnO is associated with increased resistivity.
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8

Khan, Rizwan, Muhammad Ali Inam, Saba Zam Zam, Muhammad Akram, Sookyo Shin, and Ick Tae Yeom. "Coagulation and Dissolution of CuO Nanoparticles in the Presence of Dissolved Organic Matter Under Different pH Values." Sustainability 11, no. 10 (May 17, 2019): 2825. http://dx.doi.org/10.3390/su11102825.

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The increased use of copper oxide nanoparticles (CuO NPs) in commercial products and industrial applications raises concerns about their adverse effects on aquatic life and human health. Therefore, the current study explored the removal of CuO NPs from water via coagulation by measuring solubility under various pH values and humic acid (HA) concentrations. The results showed that the media pH significantly affected the coagulation efficiency of CuO NPs (30 mg/L) under various (0–0.30 mM) ferric chloride (FC) dosages. The concentration of dissolved Cu2+ ions at pH 3–6 was (16.5–4.8 mg/L), which was higher than at other studied pH (7–11). Moreover, the simultaneous effect of coagulants and charge neutralization at pH 6–8 enhanced the removal of CuO NPs. At a lower FC (0–0.05 mM) dosage, the higher HA concentration inhibited the aggregation of CuO NPs. However, at the optimum dose of (0.2 mM) FC, the efficiency of turbidity removal and solubility of CuO NPs between pH 8 and 11 was above 98% and 5%, respectively, probably due to coagulant enmeshment. Our study suggested that coagulation was effective in removing the CuO NPs from the complex matrices with pH values ranging from 8–11. The findings of the present study provide insight into the coagulation and dissolution behavior of CuO NPs during the water treatment process.
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9

Sapkota, Kamal Prasad, Insup Lee, Md Abu Hanif, Md Akherul Islam, Jeasmin Akter, and Jae Ryang Hahn. "Enhanced Visible-Light Photocatalysis of Nanocomposites of Copper Oxide and Single-Walled Carbon Nanotubes for the Degradation of Methylene Blue." Catalysts 10, no. 3 (March 5, 2020): 297. http://dx.doi.org/10.3390/catal10030297.

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We report enhanced catalytic action of a series of copper(II)-oxide-single-walled carbon nanotube (CuO-SWCNT) composite photocatalysts (abbreviated as CuO-SWCNT-0.5, CuO-SWCNT-2, and CuO-SWCNT-5, where 0.5, 2, and 5 represent the calcination time in hours) synthesized via recrystallization followed by calcination. The photocatalytic performance of the fabricated nanocomposites was examined by evaluating the degradation of methylene blue (MB) under irradiation with visible light. All of the as-fabricated nanocomposites were effective photocatalysts for the photodegradation of a MB solution; however, the CuO-SWCNT-5 displayed the best photocatalytic ability among the investigated catalysts, achieving 97.33% degradation of MB in 2 h under visible-light irradiation. The photocatalytic action of the nanocomposites was remarkably higher than that of pristine CuO nanocrystals fabricated using the same route. The recyclability of the photocatalyst was also investigated; the CuO-SWCNT-5 catalyst could be reused for three cycles without substantial degradation of its catalytic performance or morphology.
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10

Vo, Nguyen Lam Uyen, Thi Thuy Van Nguyen, Tri Nguyen, Phung Anh Nguyen, Van Minh Nguyen, Ngoc Huy Nguyen, Van Linh Tran, Ngoc Anh Phan, and Ky Phuong Ha Huynh. "Antibacterial Shoe Insole-Coated CuO-ZnO Nanocomposite Synthesized by the Sol-Gel Technique." Journal of Nanomaterials 2020 (December 17, 2020): 1–13. http://dx.doi.org/10.1155/2020/8825567.

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In this study, CuO-ZnO composite was synthesized via the sol-gel method using oxalic acid to form the medium complex and its applications in antibacterial have been conducted with B. cereus, E. coli, S. aureus, Salmonella, and P. aeruginosa. Then, nanopowder of CuO-ZnO was coated on shoe insoles and their antibacterial effect with S. aureus was tested. The nanocomposite products were characterized by XRD, XPS, SEM, TEM, and UV-Vis. The results showed that the CuO-ZnO composite has the average particle size in a range of 20-50 nm, the point of zero charge of 7.8, and the bandgap of 1.7 eV. XPS result shows the composite structure with Cu2+ in the product. The minimum inhibitory concentration (MIC) of CuO-ZnO nanocomposite was 0.313 mg·mL-1 for S. aureus and Samonella, 0.625 mg·mL-1 for E. coli, and 5 mg·mL-1 for B. cereus and P. aeruginosa. The shoe insoles coated with 0.35 wt.% of CuO-ZnO nanocomposite also had high antibacterial activity against S. aureus, and this antibacterial nanocomposite was implanted durably on the surface of the shoe insoles.
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11

Kuterasiński, Łukasz, Jerzy Podobiński, and Jerzy Datka. "Oxidation of Ethanol in Cu-Faujasites Studied by IR Spectroscopy." Molecules 26, no. 9 (May 2, 2021): 2669. http://dx.doi.org/10.3390/molecules26092669.

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In this study, IR studies of the coadsorption of ethanol and CO on Cu+ cations evidenced the transfer of electrons from ethanol to Cu+, which caused the lowering of the frequency of the band attributed to CO bonded to the same Cu+ cation due to the more effective π back donation of d electrons of Cu to antibonding π* orbitals of CO. The reaction of ethanol with acid sites in zeolite HFAU above 370 K produced water and ethane, polymerizing to polyethylene. Ethanol adsorbed on zeolite Cu(2)HFAU containing acid sites and Cu+exch also produced ethene, but in this case, the ethene was bonded to Cu+ and did not polymerize. C=C stretching, which is IR non-active in the free ethene molecule, became IR active, and a weak IR band at 1538 cm−1 was present. The reaction of ethanol above 370 K in Cu(5)NaFAU zeolite (containing small amounts of Cu+exch and bigger amounts of Cu+ox, Cu2+exch and CuO) produced acetaldehyde, which was further oxidized to the acetate species (CH3COO−). As oxygen was not supplied, the donors of oxygen were the Cu species present in our zeolite. The CO and NO adsorption experiments performed in Cu-zeolite before and after ethanol reaction evidenced that both Cu+ox and Cu2+ (Cu2+exch and CuO) were consumed by the ethanol oxidation reaction. The studies of the considered reaction of bulk CuO and Cu2O as well as zeolites, in which the contribution of Cu+ox species was reduced by various treatments, suggest that ethanol was oxidized to acetaldehyde by Cu2+ox (the role of Cu+ox could not be elucidated), but Cu+ox was the oxygen donor in the acetate formation.
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12

Zhu, Jun Wu, Tian Jian Cheng, Dong Ping Sun, Qiao Feng Han, and Xin Wang. "Synthesis of CuO Nanocrystals in a Water-Isopropanol System." Advanced Materials Research 148-149 (October 2010): 1011–15. http://dx.doi.org/10.4028/www.scientific.net/amr.148-149.1011.

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A facile method capable of preparing CuO nanocrystals has been developed in a water-isopropanol system. The different shapes of CuO nanocrystals can be obtained simply by adjusting the amount of adding water in the reaction system. Rod-like CuO nanocrystals with diameters of 5 nm and lengths of 20 nm, and spherical CuO nanoparticles with sizes of 5-8 nm can be formed. Furthermore, the obtained CuO product has a high surface area of 128 m2/g, which is very important for its applications especially in catalysts.
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13

Zelvia, Essy Puspa, and Elvaswer Elvaswer. "Karakterisasi Sensor Gas Liquefied Petroleum Gas (LPG) Dari Bahan Semikonduktor Heterokontak CUO/CUO(TIO2)." JURNAL ILMU FISIKA | UNIVERSITAS ANDALAS 9, no. 2 (November 9, 2017): 87–96. http://dx.doi.org/10.25077/jif.9.2.87-96.2017.

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Telah dilakukan karakterisasi sensor Liquefied Petroleum Gas (LPG) berupa pelet heterokontak dengan lapisan pertama pelet adalah 100% mol CuO dan lapisan kedua pelet adalah CuO yang dicampur 10% mol, 20% mol, 30% mol, 40% mol dan 50% mol TiO2. Tahap pembuatan sensor LPG terdiri atas pencampuran bahan, kalsinasi pada temperatur 500oC selama 4 jam, penggerusan, kompaksi, dan sintering pada temperatur 700oC selama 4 jam. Sensor LPG diuji pada temperatur ruang (27oC) dengan melihat karakteristik arus dan tegangan (I-V), nilai sensitivitas, nilai konduktivitas dan karakterisasi XRD. Karakteristik I-V menunjukkan perubahan terbesar terjadi pada sampel CuO/CuO(20% mol TiO2). Nilai sensitivitas tertinggi dimiliki sampel CuO/CuO(20% mol TiO2) sebesar 11,94 pada tegangan 10 volt, dan merupakan sampel yang paling bagus digunakan sebagai sensor gas LPG. Nilai konduktivitas tertinggi dimiliki sampel CuO/CuO(10% mol TiO2) dengan nilai konduktivitas di udara sebesar 6,60557x10-5 Ω-1m-1 dan nilai konduktivitas di LPG 25,80712x10-5 Ω-1m-1. Kata kunci : heterokontak, sensor LPG, CuO/CuO(TiO2), karakterisasi I-V, sensitivitas, konduktivitas.
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14

Mabrouk, Mostafa, Sayed Hamed Kenawy, Gehan El Tabie El-Bassyouni, Ahmed Abd El-Fattah Ibrahim Soliman, and Esmat Mahmoud Aly Hamzawy. "Cancer Cells Treated by Clusters of Copper Oxide Doped Calcium Silicate." Advanced Pharmaceutical Bulletin 9, no. 1 (February 21, 2019): 102–9. http://dx.doi.org/10.15171/apb.2019.013.

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Purpose: Different compositions of copper oxide (CuO)-doped calcium silicate clusters wereused to treat the cancer cells.Methods: The influence of CuO content on the morphology, drug delivering ability,physicochemical properties and cytotoxicity was investigated.Results: The microcrystalline structure revealed the decrement of the size from (20-36 nm) to(5-7 nm) depending on the copper content percentages. Drug delivering ability of doxycyclinehyclate (Dox) was down regulated from 58% to 28%in the presence of the CuO. The inclusionof CuO and Dox didn’t show any remarkable changes on the physicochemical properties of theCuO-doped calcium silicate nanoparticles.Conclusion: The CuO-doped calcium silicate sample (5 weight %) exhibited great cytotoxicityagainst the tested cell lines compared to the CuO-free sample. CuO-doped materials displayedsignificant anticancer effect; this sheds light on its implication in the treatment of cancer.
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15

Chiang, M. J., C. W. Wu, and H. E. Cheng. "Effect of Oxygen Flow Rate and Temperature on the Structure of DC Sputtered Nanocrystalline Copper Oxide Films." Advanced Materials Research 31 (November 2007): 129–31. http://dx.doi.org/10.4028/www.scientific.net/amr.31.129.

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Copper oxide, a direct band gap semiconductor with band gap about 1.21-1.51 eV, has been regarded as a promising material for photovoltaic. Nanocrystalline copper oxide films have been synthesized on Si by dc sputtering method. The effects of oxygen flow rate and deposition temperature on the microstructure of nanocrystalline copper oxide films were investigated. X-ray diffraction analysis shows that a broaden peak of Cu2O (111) at 36.720 was observed at the deposition condition of DC power 150 W, pressure 2*10-2 Torr, substrate temperature 100 °C, Ar flow rate 15 sccm and O2 flow rate 1sccm. With increasing the oxygen flow rate to 3 and 5 sccm, CuO (-111) could be observed at 36.58o. The increase of oxygen flow rate resulted in the film formation from Cu2O to CuO. SEM pictures show that copper oxide films exhibit nanosize grains. X-ray diffraction patterns of CuO films deposited at 50~200 °C show that only (-111) plane is obtained. The SEM pictures show that the grain size increases with the deposition increases.
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16

Slamet, Slamet, R. Arbianti, and E. Marliana. "PENGOLAHAN LIMBAH Cr(VI) DAN FENOL DENGAN FOTOKATALIS SERBUK TiO2 DAN CuO/TiO2." Reaktor 11, no. 2 (December 13, 2007): 78. http://dx.doi.org/10.14710/reaktor.11.2.78-85.

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Studi tentang pengolahan limbah Cr(VI) dan fenol secara fotokatalisis telah dilakukan dengan fotokatalis TiO2 dan CuO/TiO2. Katalis CuO/TiO2 dipreparasi dengan cara impregnasi terhadap TiO2 Degussa P25 menggunakan larutan garam tembaga yang berasal dari berbagai jenis prekursor. Komposisi Cu dalam katalis divariaskani dari 0,2% hingga 5%. Fotokatalis tersebut kemudian dikarakterisasi DRS (Diffuse Reflectance Spectroscopy) dan XRD (X-Ray Diffraction). Aktivitas fotokatalis diuji dengan menggunakan sistem reaktor slurry yang bekerja secara batch dan dilengkapi dengan 6 lampu UV black light selama 5 jam, kemudian hasilnya dianalisis dengan UV-VIS Spectrophotometer. Hasil karakterisasi DRS menunjukan bahwa penambahan CuO dari 1% hingga 5% ke dalam TiO2 dapat meningkatkan pita absorbansi katalis dari 398 hingga 413 nm dan menurunkan band gap dari 3,2 hingga 2,58 eV. Hasil karakterisasi XRD menunjukan adanya struktur kristal anatase dan rutil dalam katalis TiO2 dan CuO/TiO2, sementara struktur kristal CuO muncul pada katalis CuO/TiO2 yang dipreparasi dengan prekursor Cu-Asetat dan Cu-Nitrat. Fotokatalis 0,2% CuO/TiO2 dari prekursor Cu-Asetat memiliki aktivitas optimal yang mereduksi Cr(VI) 99,67% dan mendegradasi fenol 97,16%. Sementara jika kedua limbah tersebut diolah secara simultan, katalis TiO2 Degussa P25 memiliki aktivitas yang paling tinggi dengan meningkatkan konversi reduksi Cr(VI) menjadi 100% dan menurunkan konversi degradasi fenol menjadi 93,81% dengan waktu reaksi 5 jam.
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17

Lanjewar, Abhishek, Bharat Bhanvase, Divya Barai, Shivani Chawhan, and Shirish Sonawane. "Intensified Thermal Conductivity and Convective Heat Transfer of Ultrasonically Prepared CuO–Polyaniline Nanocomposite Based Nanofluids in Helical Coil Heat Exchanger." Periodica Polytechnica Chemical Engineering 64, no. 2 (June 3, 2019): 271–82. http://dx.doi.org/10.3311/ppch.13285.

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In this study, investigation of convective heat transfer enhancement with the use of CuO–Polyaniline (CuO–PANI) nanocomposite basednanofluid inside vertical helically coiled tube heat exchanger was carried out experimentally. In these experiments, the effects of different parameters such as Reynolds number and volume % of CuO–PANI nanocomposite in nanofluid on the heat transfer coefficient of base fluid have been studied. In order to study the effect of CuO–PANI nanocomposite based nanofluid on heat transfer, CuO nanoparticles loaded in PANI were synthesized in the presence of ultrasound assisted environment at different loading concentration of CuO nanoparticles (1, 3 and 5 wt.%). Then the nanofluids were prepared at different concentrations of CuO–PANI nanocomposite using water as a base fluid. The 1 wt.% CuO–PANI nanocomposite was selected for the heat transfer study for nanofluid concentration in the range of 0.05 to 0.3 volume % and Reynolds number range of was 1080 to 2160 (±5). Around 37 % enhancement in the heat transfer coefficient was observed for 0.2 volume % of 1 wt.% CuO–PANI nanocomposite in the base fluid. In addition, significant enhancement in the heat transfer coefficient was observed with an increase in the Reynolds number and percentage loading of CuO nanoparticle in Polyaniline (PANI).
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18

Rostami, Sedigheh, Seyed Naser Azizi, and Shahram Ghasemi. "Simultaneous electrochemical determination of hydrazine and hydroxylamine by CuO doped in ZSM-5 nanoparticles as a new amperometric sensor." New Journal of Chemistry 41, no. 22 (2017): 13712–23. http://dx.doi.org/10.1039/c7nj02685d.

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In this work, a novel electrochemical sensor using a carbon paste modified electrode with CuO doped in ZSM-5 nanoparticles (CuO/ZSM-5 NPs/CPE) is successfully fabricated for simultaneous determination of hydrazine (HY) and hydroxylamine (HA).
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19

Paz-García, Eri J., Silvia P. Paredes-Carrera, Sergio O. Flores-Valle, Isis S. Rodríguez-Clavel, Jesús C. Sánchez-Ochoa, and Rosa M. Pérez-Gutiérrez. "Synthesis of CuO for Microwave-Assisted Pyrolysis of Biomass." Applied Sciences 9, no. 24 (December 16, 2019): 5525. http://dx.doi.org/10.3390/app9245525.

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In this study, CuO was synthesized as a microwave absorber in the pyrolysis of a biomass model (sugarcane bagasse). CuO was synthesized for 5 min of irradiation using the following techniques: microwave (MW), ultrasound (US), combined mode (MW-US), and conduction heating (CH) as a reference material. The use of these treatments promotes changes in the morphology, as MW and US generate leaves and monolithic faceted morphologies, respectively. Changes were also generated in some textural characteristics such as crystal size, surface area, and volume-pore size. They were produced as a consequence of changes in the conditions during the crystallization stage produced by the different irradiation types. The microwave-assisted pyrolysis was performed aiming for the maximum liquid fraction (bio-oil) in the products. The reaction time, the size of the biomass, and the CuO synthesis method were also analyzed. The following particle size (ps) intervals were studied: ps < 0.5 mm, 0.5 mm < ps < 1.7 mm, 1.7 mm < ps < 3.5 mm. The best conditions at 1160 Watts in the microwave were: 4 min of reaction, particle size lower than 0.5 mm, and CuO synthesized by US. The use of CuO in the pyrolysis almost triples the amount of the obtained liquid fraction, when compared with the pyrolysis without the use of a microwave absorbent. The CuO was reduced to Cu2O and Cu after the pyrolysis. In this work, a reduction in the reaction times from hours to minutes was achieved during the synthesis of CuO and the pyrolysis biomass. The liquid fraction (bio-oil) can be raw material to obtain value-added chemical products or biofuels.
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20

Usoltseva, Natalya, Valery Korobochkin, Alesya S. Dolinina, and Alexander M. Ustyugov. "Infrared Spectra Investigation of CuO-Al2O3 Precursors Produced by Electrochemical Oxidation of Copper and Aluminum Using Alternating Current." Key Engineering Materials 712 (September 2016): 65–70. http://dx.doi.org/10.4028/www.scientific.net/kem.712.65.

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Joint electrochemical oxidation of copper and aluminum using alternating current (AC) was performed. The electrolysis products were dried on air (method carbonate) and at the residual pressure of 3-5 kPa (oxide method). Cu-Al layered double hydroxide (Cu-Al/LDH) are formed at air carbonization. Oxide method saves copper (I) oxide. Heat treatment causes the decomposition of LDH to CuO and Al2O3 as well as Cu2O oxidation to CuO. Copper-aluminum spinel (CuAl2O4) is the product of solid-phase interaction of copper and aluminum oxides. Infrared spectra revealed that oxide method provides the boehmite dehydration and metal oxides interaction at lower temperature despite the fact that the poorly crystallized copper (II) oxide is formed at LDH decomposition.
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Ismagilov, Z. R., S. A. Yashnik, V. F. Anufrienko, T. V. Larina, N. T. Vasenin, N. N. Bulgakov, S. V. Vosel, and L. T. Tsykoza. "Linear nanoscale clusters of CuO in Cu-ZSM-5 catalysts." Applied Surface Science 226, no. 1-3 (March 2004): 88–93. http://dx.doi.org/10.1016/j.apsusc.2003.11.035.

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22

Elbashar, Yahia, Ali Badr, Haron Elshaikh, Ahmed Mostafa, and Ali Ibrahim. "Dielectric and optical properties of CuO containing sodium zinc phosphate glasses." Processing and Application of Ceramics 10, no. 4 (2016): 277–86. http://dx.doi.org/10.2298/pac1604277e.

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Dielectric and optical properties of 45 P2O5-34 ZnO-(20?x)Na2O-1 Al2O3-xCuO glasses (0?x?5) were investigated. The frequency and composition dependencies of the dielectric parameters were analysed and discussed. The values of real part of dielectric constant (RPDC) lie between 748 to 1169 for RPDCMax, and 654 to 1031 for RPDCMin. The range of values of imaginary part of dielectric constant (IPDC) extends from 39.4 to 57.5 for IPDCMax and from 27.3 to 40.1 for IPDCMin. It was observed that each of these parameters begins to decrease with increasing CuO content, but further addition of CuO causes their rise. Thus, small amount of CuO causes a decrease in both RPDC and IPDC until CuO content reaches 2mol%, thereafter, they nearly return to their original values at 5mol% of CuO. Similar behaviour was observed for AC conductivity. Transmittances of the investigated glasses were also measured and used to estimate their optical absorption coefficients and optical band gaps. The optical energy gap is ~4 eV for the samples with up to 4mol% CuO, while it is somewhat higher (~5 eV) for the glass with 5mol% CuO.
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23

Zhang, Luoming, Yanjun Gong, Yanliang Zhai, Tong Ma, Chunfang Xu, Shouwei Zuo, Lirong Zheng, Jing Zhang, and Liu Ping. "Creation of CuOx/ZSM-5 zeolite complex: healing defect sites and boosting acidic stability and catalytic activity." Catalysis Science & Technology 10, no. 15 (2020): 4981–89. http://dx.doi.org/10.1039/d0cy00978d.

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CuOx/ZSM-5 was achieved by hydrothermally disintegrating CuO nanoparticle into zeolite. Further studies proved that stable clusters formed and connected with internal silanol, which leads to optimal acidity and high stability in hexane cracking.
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24

Li, Xiaoxin, Xiaogan Li, Ning Chen, Xinye Li, Jianwei Zhang, Jun Yu, Jing Wang, and Zhenan Tang. "CuO-In2O3Core-Shell Nanowire Based Chemical Gas Sensors." Journal of Nanomaterials 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/973156.

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The CuO-In2O3core-shell nanowire was fabricated by a two-step method. The CuO nanowire core (NWs) was firstly grown by the conventional thermal oxidation of Cu meshes at 500°C for 5 hours. Then, the CuO nanowires were immersed into the suspension of amorphous indium hydroxide deposited from the In(AC)3solution by ammonia. The CuO nanowires coated with In(OH)3were subsequently heated at 600°C to form the crystalline CuO-In2O3core-shell structure, with In2O3nanocrystals uniformly anchored on the CuO nanowires. The gas sensing properties of the formed CuO-In2O3core-shell nanowires were investigated by various reducing gases such as hydrogen, carbon monoxide, and propane at elevated temperature. The sensors using the CuO-In2O3nanowires show improved sensing performance to hydrogen and propane but a suppressed response to carbon monoxide, which could be attributed to the enhanced catalytic properties of CuO with the coated porous In2O3shell and the p-n junction formed at the core-shell interface.
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25

Peng, Zhijian, Ruichao Gao, Feng Jiang, Jianfeng He, and Xiuli Fu. "Microstructure and nonohmic properties of SnO2–Ta2O5–TiO2 varistor system doped with CuO." International Journal of Modern Physics B 28, no. 15 (May 4, 2014): 1450085. http://dx.doi.org/10.1142/s0217979214500854.

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The microstructure and nonohmic properties of SnO 2– Ta 2 O 5– TiO 2- CuO varistor system were investigated. The proposed samples were doped with different contents of CuO (0–6 mol%) and sintered at 1400°C for 2 h with conventional ceramic processing method. In all the samples, the commonly identified phase was SnO 2 (rutile); however, with increasing doping amount of CuO , the peaks of CuO phase emerged in the X-ray diffraction (XRD) patterns. Scanning electron microscopy (SEM) examination on the fractured surfaces of the samples revealed that a minor amount of CuO dopant can facilitate the sintering of the varistor ceramics, but excessive CuO would mainly segregate at grain-boundaries. The doped CuO may also act as a modifier in the SnO 2 based varistors. The measured electric-field versus current-density characteristics of the samples indicated that both nonlinear exponent and varistor voltage increased with increasing doping amount of CuO up to 3 mol% and then decreased with excessive CuO .
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26

Redjeki, Athiek Sri, Sukirno Sukirno, and Slamet Slamet. "Simultaneous Photocatalytic Esterification and Addition Reaction of Fatty Acids in Kemiri Sunan (Reutealis trisperma sp.) Oil over CuO/TiO2 Catalyst - A Novel Approach." Bulletin of Chemical Reaction Engineering & Catalysis 16, no. 4 (September 4, 2021): 816–30. http://dx.doi.org/10.9767/bcrec.16.4.11690.816-830.

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A novel approach, namely photocatalytic esterification and addition reaction of unsaturated fatty acids using CuO/TiO2 catalyst has been investigated in kemiri sunan oil. The objectives of this study are to reduce the free fatty acid (FFA) content by using catalyst CuO/TiO2, characterization of the catalyst and the operation condition of reaction. The CuO/TiO2 catalyst was synthesized by the impregnation of TiO2 P25 powder with copper nitrate solution as a precursor and followed by calcination. The field emission scanning electron microscopy (FESEM), Energy Dispersive X-ray (EDX), X-ray Diffraction (XRD), and Transmission electron microscopes (TEM) result showed that copper oxide was highly dispersed on the TiO2 surface. The X-ray Photoelectron Spectroscopy (XPS) result showed that Cu is in the state of CuO (Cu2+), while Ti is in Ti4+ ( TiO2). The bandgap energy of CuO/TiO2 was smaller than TiO2 P25. It was found that the reactions conducted in the presence of CuO/TiO2 in a photoreactor under UV irradiation can perform esterification and addition reaction of the FFA, simultaneously. The optimum reduction of the FFA was under condition of 4% loading CuO/TiO2, 4 hours reaction time, 30:1 (mole/mole) methanol to oil ratio, 5% (w/w) catalyst amount. The conversion of FFA was at around 59%. The Gas Chromatography—Mass Spectrometry (GC-MS) results showed that the addition reaction of -eleostearic acid simultaneously occured at 100% conversion. Although the photocatalyst selectivity in FFA reduction was relatively low, but double bond reduction of -eleostearic acid (C18:3) was very high. The reduction of multiple double bond is considered as positive poin to improve the oxidative stability of the product. The simultaneous esterification and addition reactions mechanism has been proposed. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
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Mikami, Kazuki, Yuta Kido, Yuji Akaishi, Armando Quitain, and Tetsuya Kida. "Synthesis of Cu2O/CuO Nanocrystals and Their Application to H2S Sensing." Sensors 19, no. 1 (January 8, 2019): 211. http://dx.doi.org/10.3390/s19010211.

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Semiconducting metal oxide nanocrystals are an important class of materials that have versatile applications because of their useful properties and high stability. Here, we developed a simple route to synthesize nanocrystals (NCs) of copper oxides such as Cu2O and CuO using a hot-soap method, and applied them to H2S sensing. Cu2O NCs were synthesized by simply heating a copper precursor in oleylamine in the presence of diol at 160 °C under an Ar flow. X-ray diffractometry (XRD), dynamic light scattering (DLS), and transmission electron microscopy (TEM) results indicated the formation of monodispersed Cu2O NCs having approximately 5 nm in crystallite size and 12 nm in colloidal size. The conversion of the Cu2O NCs to CuO NCs was undertaken by straightforward air oxidation at room temperature, as confirmed by XRD and UV-vis analyses. A thin film Cu2O NC sensor fabricated by spin coating showed responses to H2S in dilute concentrations (1–8 ppm) at 50–150 °C, but the stability was poor because of the formation of metallic Cu2S in a H2S atmosphere. We found that Pd loading improved the stability of the sensor response. The Pd-loaded Cu2O NC sensor exhibited reproducible responses to H2S at 200 °C. Based on the gas sensing mechanism, it is suggested that Pd loading facilitates the reaction of adsorbed oxygen with H2S and suppresses the irreversible formation of Cu2S.
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28

Jalaludin, Shofianina, Sarah A. Arifin, and Rosari Saleh. "Magnetic Composite Fe3O4/CuO/TiO2 Nanoparticles: Preparation, Characterization and Photocatalytic Activity." Materials Science Forum 827 (August 2015): 13–18. http://dx.doi.org/10.4028/www.scientific.net/msf.827.13.

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Magnetic composite Fe3O4/TiO2/CuO nanoparticles have been synthesized by sol-gel method at low temperature. The resultant composite nanoparticles coupled with different Cu contained by adjusting the molar ratio of CuO to (Fe3O4/TiO2) from 1:1 – 5:1. The structure, morphology and properties of nanoparticles were characterized using XRD, EDX, FESEM and VSM. The results showed that all composite nanoparticles consist of cubic spinel Fe3O4, anatase TiO2 and monoclinic CuO, have ferromagnetic properties. The photocatalytic performance was evaluated using methylene blue in aqueous solutions under UV and visible light irradiation. Among the composite Fe3O4/TiO2/CuO nanoparticles, the sample with the molar ratio of CuO to (Fe3O4/TiO2) = 5 : 1 exhibited the highest photocatalytic efficiency. Photocatalytic mechanism was investigated by measuring the photocatalytic degradation rate in the presence of scavenger. The results suggested that holes play the most important role in degradation of methylene blue.
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29

Palacio, Ruben, Sebastian Torres, Sébastien Royer, Anne Sophie Mamede, Diana López, and Diana Hernández. "CuO/CeO2 catalysts for glycerol selective conversion to lactic acid." Dalton Transactions 47, no. 13 (2018): 4572–82. http://dx.doi.org/10.1039/c7dt04340f.

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30

Zhang, Ming Yu, Hua Wang, and Wen Gui Gao. "Effect of CeO2 Promoter on Catalytic Performance of CuO-ZnO-ZrO2/HZSM-5 Catalyst for Carbon Dioxide Hydrogenation into Dimethyl Ether." Advanced Materials Research 535-537 (June 2012): 2139–42. http://dx.doi.org/10.4028/www.scientific.net/amr.535-537.2139.

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A series of CuO-ZnO-CeO2-ZrO2/HZSM-5 catalysts were prepared and characterized by XRD, H2-TPR. CO2hydrogenation to DME was carried out in a fixed bed reactor to test the catalytic performance of Ce-modified CuO-ZnO-ZrO2/HZSM-5 catalyst under the condition of GHSV=1800 h-1, p=3.0 MPa and T=250°C. The results indicate that the added CeO2improved the performance of the bifunctional catalysts, the CO2conversion and DME selectivity were obviously improved. CuO-ZnO-CeO2-ZrO2/HZSM-5 catalyst with Ce to Zr molar ratio of 1/1 showed the highest activity for DME synthesis from CO2hydrogenation.
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31

Yu, Jiemei, Taizhong Huang, Zhankun Jiang, Min Sun, and Chengchun Tang. "A Hybrid Material Combined Copper Oxide with Graphene for an Oxygen Reduction Reaction in an Alkaline Medium." Molecules 24, no. 3 (January 26, 2019): 441. http://dx.doi.org/10.3390/molecules24030441.

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In this work, an electrode material based on CuO nanoparticles (NPs)/graphene (G) is developed for ORR in alkaline medium. According to the characterization of scanning electron microscope and transmission electron microscope, CuO NPs are uniformly distributed on the wrinkled G sheets. The X-ray diffraction test reveals that the phase of CuO is monoclinic. The CuO/G hybrid electrode exhibits a positive onset potential (0.8 V), high cathodic current density (3.79 × 10−5 mA/cm2) and high electron transfer number (four-electron from O2 to H2O) for ORR in alkaline media. Compared with commercial Pt/C electrocatalyst, the CuO/G electrode also shows superior fuel durability. The high electrocatalytic activity and durability are attribute to the strong coupling between CuO NPs and G nanosheets.
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32

Wang, Quyuan, Runtian He, Jing Xu, and Fangming Jin. "Removal of 1,4-Dioxane from Wastewater by Copper Oxide Catalyzed WAO with Mild Condition." E3S Web of Conferences 233 (2021): 01131. http://dx.doi.org/10.1051/e3sconf/202123301131.

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1,4-Dioxane is a contaminant of emerging concern that is classified by the U.S. Environmental Protection Agency as a likely human carcinogen. Moreover, 1,4-dioxane easily migrates to groundwater due to its high solubility in water and hard to be biodegraded or removed by traditional water treatment technology. Therefore, it is indispensable to develop new methods and technologies to dispose of 1,4-dioxane in the wastewater. Herein, this study presented catalytic wet air oxidation (CWAO) with CuO as a catalyst and O2 as an oxidant to treat 1,4-dioxane and investigated the influence of reaction conditions, including temperature, reaction time, oxygen content, catalyst addition and pH, on the degradation of 1,4-dioxane. The highest degradation rate (R) of 1,4-dioxane was 95.8 % when the optimal reaction conditions were at 200 °C and 1 MPa O2 for 60 min with 5 mmol CuO added. If the effect of Cu2+ dissolution was not considered, the R of 1,4-dioxane is up to 99.8 % was achieved at an acidic condition (pH=3) with 2 mmol CuO added.
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33

Suganthi, R., and S. Jhancy Mary. "Thermal and Electrical Transport Properties of o-Substituted Polyanilines Encapsulated with CuO Nanoparticles." Asian Journal of Chemistry 31, no. 10 (August 30, 2019): 2261–68. http://dx.doi.org/10.14233/ajchem.2019.22134.

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Fabrication of substituted polyaniline nanocomposites with CuO results in hybrid materials with enhanced synergistic properties. Hence poly(2-chloroaniline)-composite-CuO, poly(2-chloroaniline)-composite-CuO/SDS, poly(2-methoxyaniline)-composite-CuO/SDS and poly(2-methylaniline)-composite-CuO/SDS nanocomposites were prepared chemically by in situ oxidative polymerization method. Characterization by a number of techniques such as FTIR, NMR and UV-visible spectroscopic methods, XRD and TEM are presented. The substituted polymers exhibited an appreciable interaction with the CuO (5 wt.%) nano fillers. Integral Procedural Decomposition Temperature (IPDT) and Oxidative Index(OI) calculations were done to establish the stability to heat. Thermal stability of the materials follows the trend p2ClAni-CuO-SDS > p2ClAni-CuO> p2MeAni-CuO-SDS> p2OMeAni-CuO-SDS. The electrical conductivities of poly(2-chloroaniline)-composite-CuO and poly(2-chloroaniline)-composite-CuO/SDS measured are 1.46 × 10-7 and 1.59 × 10-7 S cm-1, respectively and the presence of anionic surfactant does not change the electrical conductivity behaviour. The poly(2-methoxyaniline)/CuO-SDS and poly(2-methylaniline)/CuO-SDS exhibit an electrical conductivity of 1.68 × 10-6 and 1.24 × 10-6 S cm-1 respectively. The dielectric constant decreased with increase in frequency in the low frequency region due to electrical relaxation process. At low frequency there was a strong frequency dispersion of permittivity and above 2.5 Hz a frequency independent behavior was noted
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34

Kuterasiński, Łukasz, Jerzy Podobiński, Dorota Rutkowska-Zbik, and Jerzy Datka. "IR Studies of the Cu Ions in Cu-Faujasites." Molecules 24, no. 23 (November 22, 2019): 4250. http://dx.doi.org/10.3390/molecules24234250.

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The properties of Cu ions in dealuminated faujasite-type zeolites (Si/Al = 31) containing 1, 2, and 5 wt.% of Cu were investigated by IR spectroscopy with CO and NO as probe molecules. Cu was introduced by impregnation into zeolites in both protonic (HFAU) and sodium (NaFAU) forms of zeolite. Four kinds of Cu species were found: Cu+exch., Cu+oxide, Cu2+exch. (square, planar, and square pyramidal), and Cu2+oxide (CuO). The proportions between these four kinds of Cu depended on the amount of Cu and on the form of zeolite to which Cu was introduced (HFAU or NaFAU). Zeolites with 1 wt.% of Cu introduced to HFAU (denoted as Cu(1)HFAU) contained only Cu+exch., whereas other forms of Cu were present in zeolites of higher Cu contents. The concentration of Cu+exch. was determined by quantitative IR studies of CO adsorption. According to the IR results, some Cu ions were situated inside hexagonal prisms and/or cuboctahedra, and were inaccessible to adsorbed molecules. IR studies also evidenced that Cu ions in oxide forms—Cu+oxide and Cu2+oxide (CuO)—were better electron donors than Cu in exchange positions (Cu+exch. and Cu2+exch).
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35

Sano, Akihiro, Mikio Eto, and Hiroshi Kamimura. "I. First Principles Cluster Calculations for the Electronic Structures of CuO7 Octahedron and CuO5 Pyramid." International Journal of Modern Physics B 11, no. 32 (December 30, 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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36

Sabry, Raad S., and Roonak Abdul Salam A. Alkareem. "Synthesis of ZnO-CuO flower-like hetero-nanostructures as volatile organic compounds (VOCs) sensor at room temperature." Materials Science-Poland 36, no. 3 (September 1, 2018): 452–59. http://dx.doi.org/10.2478/msp-2018-0055.

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AbstractZnO-CuO flower-like hetero-nanostructures were successfully prepared by combining hydrothermal and dip coating methods. Flower-like hetero-nanostructures of ZnO-CuO were examined by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and UV-Vis. The sensing properties of ZnO-CuO flower-like hetero-nanostructures to volatile organic compounds (VOCs) were evaluated in a chamber containing acetone or isopropanol gas at room temperature. The sensitivity of ZnO-CuO flower-like hetero-nanostructures to VOCs was enhanced compared to that of pure leafage-like ZnO nanostructures. Response and recovery times were about 5 s and 6 s to 50 ppm acetone, and 10 s and 8 s to 50 ppm isopropanol, respectively. The sensing performance of ZnO-CuO flower-like hetero-nanostructures was attributed to the addition of CuO that led to formation of p-n junctions at the interface between the CuO and ZnO. In addition, the sensing mechanism was briefly discussed.
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37

Tetra, Olly Norita. "PEMBUATAN SEL FOTOVOLTAIK PASANGAN CuO/Cu DAN CuO/STAINLESS STEEL DALAM BENTUK TUNGGAL DAN SERABUT MELALUI METODA PERENDAMAN DENGAN NaOH." JURNAL ILMU FISIKA | UNIVERSITAS ANDALAS 3, no. 1 (March 20, 2011): 23–31. http://dx.doi.org/10.25077/jif.3.1.23-31.2011.

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The research about Photovoltaic cell of CuO/Cu and CuO/Stainless steel in single and fiber made by NaOH submersion method by using KCl electrolyte has been done. In this research, the KCl solution is used with different concentrations. The measurement of intensity and voltage is done before and after the Photovoltage cell is radiated by the sun light for approximately 5 minutes. The optimum concentration obtained is 0,3 M. The highest value for intensity and voltage is obtained on fiber CuO/Cu electrodes with the values are 0,364 mA and 0,170 V, measured at 11.00 – 12.00 in the noon. The length time of submersion of Cu electrode with NaOH to is affecting the intensity and voltage of CuO production, submerging in relatively optimal in 24 hour. The Photovoltaic cell can be used with or without the sun light, with the voltage being produced is 0,109 mA for fiber CuO/Cu electrodes. CuO/Cu electrodes and Stainless steel CuO/Cu electrodes can be used on Photovoltaic cell.
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Resti, Anisa, Ani Mulyasuryani, and Diah Mardiana. "The Development of Diazinon Sensors using Polyvinyl Alcohol (PVA) Membrane CuO on Surface Screen-Printed Carbon Electrode (SPCE) as a Receptor." Journal of Pure and Applied Chemistry Research 8, no. 2 (August 1, 2019): 162–69. http://dx.doi.org/10.21776/ub.jpacr.2019.008.02.468.

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The development of Diazinon sensor has been studied using polyvinyl alcohol (PVA-CuO membrane on the surface of the screen-printed carbon electrode (SPCE) as a receptor. The membrane used consisted of polyvinyl alcohol (PVA) 5% (w/v), citric acid 5% (w/v), glutaraldehyde 4% (v/v), Diazinon solution 40 ppm (v/v), and CuO 5% (w/v). This study established the effect of Diazinon at 0.01,0.02 and 0.03 (w/w). besides, the concentration of CuO was 0.5 and 1 (w/w). Signal measurements were carried out in the concentration range of the Diazinon 10-12 - 10-5 M solution in Britton-Robinson buffer at pH 2 - 5. Besides, the influence of the electrolyte type was studied using HCl pH 4, 10-5 M KCl, pH 3 phosphate and phosphate-KCl pH 3 buffers. The results of the Diazinon sensor characterization showed that the highest sensitivity was obtained at 42 mV/decade with a response time of 180 seconds.
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39

Feng, Qi, Shao Yuan Li, Wen Hui Ma, Xiao He, and Yu Xin Zou. "Hydrothermal Synthesis of Flower-Like CuO/ZnO/SiNWs Photocatalyst for Degradation of R6G under Visible Light Irradiation." Key Engineering Materials 727 (January 2017): 847–52. http://dx.doi.org/10.4028/www.scientific.net/kem.727.847.

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Flower-like CuO/ZnO/SiNWs nanostructures were successfully synthesized on SiNWs substrates using a simple hydrothermal method. The characteristics of the CuO/ZnO/SiNWs nanostructures were investigated through scanning electron microscopy (SEM), X-ray diffraction (XRD), and UV–vis spectrophotometer. SEM images revealed shape transitions when the precursor mass ratic increased from 50:50 to 5:95. The strong intensity and narrow width of XRD peaks indicate that CuO/ZnO nanostructures with high molarities have good crystallinity. The UV–vis spectro-photometer indicate that ultraviolet emissions shift slightly toward lower wavelengths with incr-easing precursor solution molarity and that the intensity increases with improvement in CuO/ZnO/SiNWs crystallization.The mechanism of CuO/ZnO/SiNWs for improvement in photocatalytic activity was also discussed.
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40

Kucherov, Alexei V. "Water as a key factor providing an easy migration/redistribution of Cu2+ species in CuO/HZSM-5." Mendeleev Communications 26, no. 3 (May 2016): 254–55. http://dx.doi.org/10.1016/j.mencom.2016.05.011.

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41

Maheswaran, R., J. Sunil, R. Vettumperumal, and S. Velu Subhash. "Stability analysis of CuO suspended API GL-5 gear lubricant sol." Journal of Molecular Liquids 249 (January 2018): 617–22. http://dx.doi.org/10.1016/j.molliq.2017.11.102.

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42

Денисова, Л. Т., Н. В. Белоусова, В. М. Денисов, and Н. А. Галиахметова. "Высокотемпературная теплоемкость оксидов системы CuO-V-=SUB=-2-=/SUB=-O-=SUB=-5-=/SUB=-." Физика твердого тела 59, no. 6 (2017): 1243. http://dx.doi.org/10.21883/ftt.2017.06.44500.407.

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С помощью твердофазного синтеза из исходных компонентов CuO и V2O5 при ступенчатом обжиге получены CuV2O6 и Cu2V2O7. Методом дифференциальной сканирующей калориметрии измерена высокотемпературная теплоемкость оксидных соединений. По экспериментальным зависимостям CP=f(T) рассчитаны термодинамические свойства (изменение энтальпии, энтропии и приведенная энергия Гиббса). Установлено, что между удельной теплоемкостью и составом оксидов системы CuO-V2O5 имеется корреляция. DOI: 10.21883/FTT.2017.06.44500.407
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43

Yang, Yulin, Zhihao Yi, Jie Sun, Jigang Li, Tian Zhou, and Shouping Wei. "The Effect of CuO/CeO2 Preparation Methods on the HCN Catalytic Removal Efficiency." E3S Web of Conferences 213 (2020): 01006. http://dx.doi.org/10.1051/e3sconf/202021301006.

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In this paper, the porous CeO2 flowerlike spheres support and a series of CuO/CeO2 prepared by different methods were synthesized. The SEM, XRD, BET, H2-TPR and FT-IR characterization were conducted to probe the physicochemical properties of the samples. To evaluate the HCN catalytic removal efficiency over the prepared samples, the breakthrough time of HCN over different samples were investigated. The results implied the CuO/CeO2 prepared by precipitation method (donated as Ce-5) showed highest catalytic activity, the breakthrough time of which was more than 70 min at 30 °C. It was proved the dispersion of CuO phase on the support, the redox properties and the interaction between CuO and CeO2 support over CuO/CeO2 played an important role in the HCN catalytic removal process. FT-IR analysis demonstrated the CuCN was generated due to the chemisorption of CuO and HCN.
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44

Hong, Shiquan, Yong Yu, Zhijie Yi, Haijun Zhu, Wencheng Wu, and Peiyan Ma. "Highly Efficient and Recyclable g-C3N4/CuO Hybrid Nanocomposite Towards Enhanced Visible-Light Photocatalytic Performance." Nano 11, no. 11 (October 20, 2016): 1650121. http://dx.doi.org/10.1142/s1793292016501216.

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A highly efficient visible-light-driven g-C3N4/CuO hybrid nanocomposite catalyst with different molar contents of CuO are successfully fabricated via a simple liquid phase synthesis process and applied to the degradation of Rhodamine B (RhB) solution. The results reveal that monodisperse CuO nanoparticles with a size of less than 10[Formula: see text]nm are uniformly distributed on the surface of g-C3N4 nanosheets. Compared with the pure g-C3N4 and CuO, the as-prepared nanocomposite displays significantly enhanced photocatalytic performance under visible-light irradiation. Attractively, the photocatalytic activities of the nanocomposite catalysts can be tuned by adjusting the molar ratio of g-C3N4 and CuO. When the molar ratio reaches 2:1, the nanocomposite exhibits the highest photocatalytic activity, which can decompose RhB completely in 5[Formula: see text]min. The improved performance could be ascribed to the formation of heterostructure between g-C3N4 and CuO as well as the decreased particle size of CuO, the presence of H2O2, large surface-exposure area and the suitable band position of g-C3N4/CuO nanocomposite. Interestingly, the nanocomposite shows excellent stability and recyclable property toward the photodegradation of RhB. Finally, a possible photocatalytic mechanism is proposed.
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45

Utamiyanti, Intan Frina, Barlah Rumhayati, and Ani Mulyasuryani. "THE DEVELOPMENT OF GLUCOSE SENSOR BASED ON SiO2-CuO MATERIALS USING SCREEN PRINTED CARBON ELECTRODE (SPCE)." ALCHEMY Jurnal Penelitian Kimia 12, no. 1 (August 17, 2016): 50. http://dx.doi.org/10.20961/alchemy.12.1.942.50-60.

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The development of material-based glucose sensor SiO<sub>2</sub>-CuO using Screen Printed Carbon Electrode (SPCE) had been done. Three types of materials were used to detect glucose, i.e Multi Wall Carbon Nanotube (MWCNT)-SiO2-CuO, SiO2-CuO (A) dan SiO2-CuO (B). The differences composition of SiO<sub>2</sub>-CuO(A) and SiO<sub>2</sub>-CuO(B) occurred during the addition of NaOH in synthesis process of SiO2-CuO (B). The prepared materials were analyzed by Scanning Electron Microscopy (SEM), cyclic voltammetry method and chrono-amperometry. Cyclic voltammetry analysis was conducted at a potential range of -1.0 - 1.5 V with Ag/AgCl as reference electrode. The scan rate was 100 mV/sec and the potential was varied at (-0.6), (-0.5) and (-0.4) V, in which the duration of each analysis was 5 second. Based on the result of analysis, whether by SEM, cyclic voltammetry and chrono-amperometry, the SiO<sub>2</sub>-CuO (B) was found to be the best material for detection of glucose.
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46

Utamiyanti, Intan Frina, Barlah Rumhayati, and Ani Mulyasuryani. "THE DEVELOPMENT OF GLUCOSE SENSOR BASED ON SiO2-CuO MATERIALS USING SCREEN PRINTED CARBON ELECTRODE (SPCE)." ALCHEMY Jurnal Penelitian Kimia 12, no. 1 (August 17, 2016): 50. http://dx.doi.org/10.20961/alchemy.v12i1.942.

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The development of material-based glucose sensor SiO<sub>2</sub>-CuO using Screen Printed Carbon Electrode (SPCE) had been done. Three types of materials were used to detect glucose, i.e Multi Wall Carbon Nanotube (MWCNT)-SiO2-CuO, SiO2-CuO (A) dan SiO2-CuO (B). The differences composition of SiO<sub>2</sub>-CuO(A) and SiO<sub>2</sub>-CuO(B) occurred during the addition of NaOH in synthesis process of SiO2-CuO (B). The prepared materials were analyzed by Scanning Electron Microscopy (SEM), cyclic voltammetry method and chrono-amperometry. Cyclic voltammetry analysis was conducted at a potential range of -1.0 - 1.5 V with Ag/AgCl as reference electrode. The scan rate was 100 mV/sec and the potential was varied at (-0.6), (-0.5) and (-0.4) V, in which the duration of each analysis was 5 second. Based on the result of analysis, whether by SEM, cyclic voltammetry and chrono-amperometry, the SiO<sub>2</sub>-CuO (B) was found to be the best material for detection of glucose.
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47

Feng, Guangjie, Manqin Liu, Yalei Liu, Zhouxin Jin, Yifeng Wang, and Dean Deng. "Wetting Behavior of the Ag-5CuO Brazing Alloy on ZTA Composite Ceramic with/without CuO Coating in Air." Crystals 11, no. 6 (May 28, 2021): 609. http://dx.doi.org/10.3390/cryst11060609.

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The wetting of Ag-5 wt.% CuO (Ag-5CuO) alloy on initial/CuO-coated zirconia toughened alumina (ZTA) composite ceramic in air was studied in detail. The results showed that the contact angle of the Ag-5CuO/ZTA system rapidly decreased from 81° at 970 °C to 45° at 990 °C during the heating process, however, moderate reductions in contact angle were observed in the subsequent heating and temperature holding stages. In comparison with the contact angle of pure Al2O3, an increment of about 4° of the stable contact angle of Ag-5CuO alloy on the heterogeneous ZTA was observed. The reaction between Al2O3 and CuO can reduce the damage of the CuO-rich liquid to ZrO2 in the ZTA substrate. Both oxygen and CuO were helpful in reducing the contact angle of Ag on ZTA and enhancing the bonding of the Ag/ZTA interface. The continuous CuO coating on ZTA and the monotectic liquid containing more CuO in the region near the triple line induced reductions of more than 40° and about 10° in the contact angle, respectively, between the initial and the CuO coating-improved wetting systems.
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48

Naji, Iqbal S. "Characterization of CuO-doped tin dioxide thin films prepared by pulsed-laser deposition for gas-sensing applications." Proceedings of the Institution of Mechanical Engineers, Part N: Journal of Nanomaterials, Nanoengineering and Nanosystems 233, no. 1 (December 29, 2018): 17–25. http://dx.doi.org/10.1177/2397791418819267.

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The influence of doping level of tin oxide films with different amounts of CuO additives (5%, 10%, 15%, and 20%) on structural, optical, and electrical properties is investigated. The films were prepared by pulsed-laser deposition method. X-ray diffraction patterns show the polycrystalline structure for all films with tetragonal phase for SnO2 and monoclinic phase for CuO, and no reaction between them. The surface morphology of films was analyzed and it revealed nano-sized grains for samples doped with 10% and 15% CuO. Hall’s effect measurements show increasing conductivity with increase in the CuO ratio and transfer the type of charge carriers from n- to p-type with 20% CuO. The H2S sensing properties are influenced by the CuO ratio in the SnO2 films as well as the operation temperature. The SnO2 sensor loaded with 10% CuO is extremely sensitive to H2S and the best operation temperature is 50°C, and it exhibits fast response speed of 7 s and recovery time of 20 s for trace level (10 ppm) H2S gas detection.
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49

Zheng, Xiaoying, Xiaoyao Shao, Yuan Zhang, Mengmeng Yang, Zhi Xu, and Linghua Zhu. "Effects of CuO NPs on the pollutant removal, EPS and microbial community of aerobic granular sludge." E3S Web of Conferences 131 (2019): 01129. http://dx.doi.org/10.1051/e3sconf/201913101129.

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With the increasing use of cupric oxide nanoparticles (CuO NPs), its potential environmental toxicity has been concerned nowadays. Aerobic granular sludge (AGS) is a special collection of microorganisms. This research studied under long exposure to the concentration of 5, 10 and 20 mg/L of CuO NPs, pollutants removal efficiency of AGS, extracellular polymers (EPS) and microbial communities in aerobic/anaerobic/anoxic (A/O/A) sequencing batch reactors (SBRs). The results showed that COD removal rates was stable, and the removal efficiencies of TN decreased because of the high concentration CuO NPs. On the 45th day, the TP removal efficiency of the reactor with CuO NPs concentration of 10 mg/L and 20 mg/L decreased to 55.83% and 43.72%, respectively. The denitrifying phosphorus removal-aerobic granular sludge (DPR-AGS) had certain resistance to the short-term impact of CuO NPs, and the phosphorus removal ability decreased at the late stage of the impact test. Besides, CuO NPs decreased the stability of DPR-AGS. High-throughput sequencing showed that CuO NPs decreased microbial diversity of DPR-AGS.
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50

Syafnur, Zulfikri, and Elvaswer Elvaswer. "Karakteristik Arus-Tegangan Semikonduktor Copper Oxide Didoping dengan Zinc Oxide Sebagai Sensor Gas Hidrogen." Jurnal Fisika Unand 6, no. 2 (April 4, 2017): 176–82. http://dx.doi.org/10.25077/jfu.6.2.176-182.2017.

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Telah dilakukan karakterisasi sensor gas hidrogen berupa pelet dengan bahan utama CuO yang didoping dengan ZnO. Pelet dibuat dengan variasi konsentrasi doping ZnO. Sensor gas hidrogen dibuat dengan menggunakan metode reaksi dalam keadaan padat. Sensor gas hidrogen diuji pada temperatur ruang dengan melihat karakteristik I-V, sensitivitas, konduktivitas, waktu respon, dan kristalinitas. Karakteristik I-V menunjukkan bahwa sampel dengan doping ZnO sebanyak 8% mol memiliki sensitivitas tertinggi yaitu 4,59 pada tegangan kerja 21 Volt. Nilai konduktivitas tertinggi dimiliki sampel CuO doping 2% mol ZnO yaitu 21,91 x 10-5/Ωm pada lingkungan hidrogen. Waktu respon sampel CuO didoping 8% mol ZnO adalah 45 s pada tegangan 21 Volt. Hasil XRD menunjukkan ukuran kristal CuO didoping 8% mol ZnO lebih besar dibandingkan dengan bahan CuO tanpa doping. Sensor gas hidrogen telah mampu membedakan kondisi di lingkungan hidrogen dengan kondisi di lingkungan udara, dengan sensitivitas yang tinggi dan waktu respon yang singkat. Sensor yang paling optimal digunakan adalah CuO didoping 8% mol ZnO.Kata kunci : sensor gas hidrogen, CuO, ZnO, sensitivitas, waktu respon
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