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Добірка наукової літератури з теми "CUO NANOSTRUCTURES"

Автор: Grafiati
Опубліковано: 11 вересня 2023

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Статті в журналах з теми "CUO NANOSTRUCTURES"

1

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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Анотація:
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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2

Kaur, Gurjinder, Amlan Baishya, R. Manoj Kumar, Debrupa Lahiri, and Indranil Lahiri. "Distinct Levels of Adhesion Energy of In-Situ Grown CuO Nanostructures." Journal of Nanoscience and Nanotechnology 20, no. 6 (June 1, 2020): 3527–34. http://dx.doi.org/10.1166/jnn.2020.17419.

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Анотація:
CuO nanostructures were reported for a myriad of applications in diverse areas such as high Tc superconductors, field emitters, catalysts, gas sensors, magnetic storage, biosensors, superhydrophobic surfaces, energy materials etc. In all these applications, structural stability of the nanostructures is very important for efficient functioning of devices with a longer lifetime. Hence, it is necessary to understand the adhesion energy of these nanostructures with their substrates. In this research work, a variety of CuO nanostructures were synthesized directly on Cu foil substrate by varying only the concentration of the reagents. CuO nanostructures, thus grown, were subjected to a nano-scratch test to quantify their adhesion strength with Cu substrate. The adhesion energy was observed to be highest for nanorods and lowest for nanoribbons among all the CuO nanostructures synthesized in this work. Results of this research will be useful in predicting the service life and in improving the efficiency of CuO nanostructure-based devices.
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3

Candemir, Duygu, and Filiz Boran. "Size Controllable Synthesis and Characterization of CuO Nanostructure." Materials Science Forum 915 (March 2018): 98–103. http://dx.doi.org/10.4028/www.scientific.net/msf.915.98.

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Анотація:
In this study, copper oxide (CuO) nanostructures were successfully prepared by adding EG (ethylene glycol) and PEG (4000, 8000) (polyethylene glycol) via an in-situ chemical precipitation method. EG and PEG (4000, 8000) were effective for changing the particular size of CuO and we examined the effects of drying type such as freeze drying, muffle and horizontal furnace on the size of CuO nanostructure. The structure, morphology and elemental analysis of CuO nanostructure were analyzed by field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) and energy dispersive X-ray spectroscopy (EDS). Also, the CuO nanostructures showed excellent electrical conductivity by the changing of PEG’s molecular weight and drying processes.
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4

Raksa, Phathaitep, A. Gardchareon, N. Mangkorntong, and Supab Choopun. "CuO Nanostructure by Oxidization of Copper Thin Films." Advanced Materials Research 55-57 (August 2008): 645–48. http://dx.doi.org/10.4028/www.scientific.net/amr.55-57.645.

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CuO nanostructures were synthesized by oxidizing copper thin films. The copper thin film was grown on alumina substrates by evaporation copper powder at pressure of 0.04 mtorr. The copper thin films were then oxidized 800, and 900oC for 12, 24 and 48 hr, respectively. The obtained CuO nanostructures were investigated by Energy Dispersive Spectroscopy (EDS), Field Emission Scanning Electron Microscope (FE-SEM) image, and X-Ray Diffraction (XRD). The diameter of CuO nanostructure is around 100-600 nanometers and it is depends on oxidation reaction time and temperature. These CuO nanostructures have a potential application for nanodevices such as nano gas sensor or dye-sensitized solar cells.
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5

Kasian, Pristanuch, and Supakorn Pukird. "Gas Sensing Properties of CuO Nanostructures Synthesized by Thermal Evaporation of Copper Metal Plate." Advanced Materials Research 93-94 (January 2010): 316–19. http://dx.doi.org/10.4028/www.scientific.net/amr.93-94.316.

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Анотація:
CuO nanostructures were synthesized by thermal evaporation method. Using Cu metal plate at temperature of 400oC for 24 hrs in one atmosphere of oxygen and studied structural and gas sensing properties. The CuO nanostructured were investigated by the stereo microscope (image analyzer), X-ray diffraction, scanning electron microscope. The diameter of CuO nanowires vary from 10 nm to 50 nm and length of several 10 micrometers. The sensitivity of CuO nanostructures and response were performed at room temperature for ethanol and CO2 sensor.
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6

Fu, Xiao Ming, and Jie Ren. "Synthesis of CuO Flower-Nanostructure via the Hydrothermal Method." Advanced Materials Research 873 (December 2013): 131–34. http://dx.doi.org/10.4028/www.scientific.net/amr.873.131.

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Анотація:
CuO flower-nanostructures are successfully synthesized with CuCl2 as copper source and Na2CO3 as auxiliary salt at 180 °C for 24 h via the simple hydrothermal method. The phase and the morphologies of the samples have been characterized and analyzed by XRD (X-ray diffraction) and SEM (Scanning electron microscope), respectively. XRD analysis shows that the phase of as obtained samples is CuO. SEM analysis confirms that the increase of the reaction temperature is propitious to synthesize CuO flower-nanostructures while the increase of the reaction time is not in favor of their synthesis. The influence of the increase of the auxiliary salt on the morphology of CuO flower-nanostructures is not remarkable. The mechanism of the formation of CuO flower-nanostructure is discussed.
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7

Zhang, W. X., Z. H. Yang, S. X. Ding, and S. H. Yang. "Synthesis and Characterization of Nanostructured CuO Array Films." Solid State Phenomena 121-123 (March 2007): 303–6. http://dx.doi.org/10.4028/www.scientific.net/ssp.121-123.303.

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Анотація:
In this paper, we report a simple and large-scale fabrication of CuO array films with different nanostructures grown on copper foils. CuO nanotube and nanorod array films were synthesized through the dehydration of the nanostructured Cu(OH)2 arrays in flow of N2, which are prepared in an alkali solution at a low temperature without using any templates and surfactants. The obtained CuO nanotube and nanorod array films retain similar morphology to that of the Cu(OH)2 precursors. While CuO nanosheet and nanobelt array films were prepared directly in the alkali solution. The evolution of the nanostructures as a function of the reaction conditions has been revealed, from nanorods of Cu(OH)2 to nanotubes of Cu(OH)2 to nanosheets of CuO to nanobelts of CuO. Experiments show that the growth temperature plays an important role in the formation of well-aligned Cu(OH)2 nanostructured array films on copper foil. The samples are characterized by XRD, SEM and TEM.
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8

Tatsuoka, Hirokazu, Wen Li, Er Chao Meng, Daisuke Ishikawa, and Kaito Nakane. "Syntheses and Structural Control of Silicide, Oxide and Metallic Nano-Structured Materials." Solid State Phenomena 213 (March 2014): 35–41. http://dx.doi.org/10.4028/www.scientific.net/ssp.213.35.

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Анотація:
The structural control and morphological modification of a series of silicide, oxide and Ag metal nanostructures have been further discussed with reviews of nanostructure syntheses, such as CrSi2 nanowire bundles dendrites, MoSi2 nanosheets, α-Fe2O3 nanowires nanobelts, CuO/Cu2O nanowire axial heterostructures, ZrO2/SiOx and CrSi2/SiOx core/shell nanowires. In addition, the syntheses of Ag three-dimensional dendrites, two-dimensional dendrites, two-dimensional fractal structures, particles and nanowires also were discussed. Moreover, the structural and morphological properties of the nanostructures were examined. The structural control and morphological modifications of the nanostructures have been successfully demonstrated by the appropriate thermal treatments with specific starting materials. A large volume of silicide nanowire bundles, large area of oxide nanowire arrays and large area Ag nanostructure coatings were successfully fabricated.
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9

Chan, Yu Bin, Vidhya Selvanathan, Lai-Hock Tey, Md Akhtaruzzaman, Farah Hannan Anur, Sinouvassane Djearamane, Akira Watanabe, and Mohammod Aminuzzaman. "Effect of Calcination Temperature on Structural, Morphological and Optical Properties of Copper Oxide Nanostructures Derived from Garcinia mangostana L. Leaf Extract." Nanomaterials 12, no. 20 (October 13, 2022): 3589. http://dx.doi.org/10.3390/nano12203589.

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Анотація:
Synthesis of copper oxide (CuO) nanostructures via biological approach has gained attention to reduce the harmful effects of chemical synthesis. The CuO nanostructures were synthesized through a green approach using the Garcinia mangostana L. leaf extract and copper (II) nitrate trihydrate as a precursor at varying calcination temperatures (200–600 °C). The effect of calcination temperatures on the structural, morphological and optical properties of CuO nanostructures was studied. The red shifting of the green-synthesized CuO nanoparticles’ absorption peak was observed in UV-visible spectrum, and the optical energy bandgap was found to decrease from 3.41 eV to 3.19 eV as the calcination temperatures increased. The PL analysis shown that synthesized CuO NPs calcinated at 500 °C has the maximum charge carriers separation. A peak located at 504–536 cm−1 was shown in FTIR spectrum that indicated the presence of a copper-oxygen vibration band and become sharper and more intense when increasing the calcination temperature. The XRD studies revealed that the CuO nanoparticles’ crystalline size was found to increase from 12.78 nm to 28.17 nm, and dislocation density decreased from 61.26 × 1014 cm−1 to 12.60 × 1014 cm−1, while micro strain decreased from 3.40 × 10−4 to 1.26 × 10–4. From the XPS measurement, only CuO single phase without impurities was detected for the green-mediated NPs calcinated at 500 °C. The morphologies of CuO nanostructures were examined using FESEM and became more spherical in shape at elevated calcination temperature. More or less spherical nanostructure of green-mediated CuO calcinated at 500 °C were also observed using TEM. The purity of the green-synthesized CuO nanoparticles was evaluated by EDX analysis, and results showed that increasing calcination temperature increases the purity of CuO nanoparticles.
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10

Tran, Thi Ha, and Viet Tuyen Nguyen. "Copper Oxide Nanomaterials Prepared by Solution Methods, Some Properties, and Potential Applications: A Brief Review." International Scholarly Research Notices 2014 (December 17, 2014): 1–14. http://dx.doi.org/10.1155/2014/856592.

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Анотація:
Cupric oxide (CuO), having a narrow bandgap of 1.2 eV and a variety of chemophysical properties, is recently attractive in many fields such as energy conversion, optoelectronic devices, and catalyst. Compared with bulk material, the advanced properties of CuO nanostructures have been demonstrated; however, the fact that these materials cannot yet be produced in large scale is an obstacle to realize the potential applications of this material. In this respect, chemical methods seem to be efficient synthesis processes which yield not only large quantities but also high quality and advanced material properties. In this paper, the effect of some general factors on the morphology and properties of CuO nanomaterials prepared by solution methods will be overviewed. In terms of advanced nanostructure synthesis, microwave method in which copper hydroxide nanostructures are produced in the precursor solution and sequentially transformed by microwave into CuO may be considered as a promising method to explore in the near future. This method produces not only large quantities of nanoproducts in a short reaction time of several minutes, but also high quality materials with advanced properties. A brief review on some unique properties and applications of CuO nanostructures will be also presented.
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Більше джерел

Дисертації з теми "CUO NANOSTRUCTURES"

1

Suman, Pedro Henrique. "Sensores de gás a base de SnO2-CuO /." Araraquara, 2016. http://hdl.handle.net/11449/144288.

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Анотація:
Orientador: Marcelo Ornaghi Orlandi
Banca: Anderson Andre Felix
Banca: Valmor Roberto Mastelaro
Banca: Luis Vicente de Andrade Scalvi
Banca: Rosario Elida Suman Bretas
Resumo: Neste trabalho, as propriedades sensoras de gás de nanoestruturas de óxido de estanho puras (SnO2) e híbridas (SnO2-Pt, SnO2-CuO e SnO2-CuO-Pt) foram estudadas na presença de diferentes gases. Os materiais foram sintetizados pelo método de electrospinning seguido por tratamento térmico e, posteriormente, foram caracterizados por termogravimetria (TG), difração de raios X (DRX), microscopia eletrônica de varredura com emissão por campo (MEV-FEG), microscopia eletrônica de transmissão (MET), espectroscopia por dispersão em energia de raios X (EDS), microscopia de força atômica (AFM) e área de superfície específica e porosidade (BET). O foco principal do trabalho foi analisar a resposta dos materiais sintetizados como sensores de gás para a detecção de gases tóxicos e inflamáveis em baixas concentrações e em uma temperatura de operação de 300 °C. Os resultados obtidos a partir das caracterizações estruturais e morfológicas mostraram que o método de electrospinning permite a obtenção de materiais unidimensionais (1D) policristalinos com elevada homogeneidade morfológica e pureza cristalina. Além disso, os elementos químicos presentes nas estruturas de cada material sintetizado foram mapeados e identificados, onde verificou-se que todos os elementos estão homogeneamente distribuídos ao longo da estrutura das fibras. As características superficiais dos materiais, tais como rugosidade e porosidade também foram estudadas e os resultados indicaram que, dependendo da composição química... (Resumo completo, clicar acesso eletrônico abaixo)
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2

Suman, Pedro Henrique [UNESP]. "Sensores de gás a base de SnO2-CuO." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/144288.

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Анотація:
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Neste trabalho, as propriedades sensoras de gás de nanoestruturas de óxido de estanho puras (SnO2) e híbridas (SnO2-Pt, SnO2-CuO e SnO2-CuO-Pt) foram estudadas na presença de diferentes gases. Os materiais foram sintetizados pelo método de electrospinning seguido por tratamento térmico e, posteriormente, foram caracterizados por termogravimetria (TG), difração de raios X (DRX), microscopia eletrônica de varredura com emissão por campo (MEV-FEG), microscopia eletrônica de transmissão (MET), espectroscopia por dispersão em energia de raios X (EDS), microscopia de força atômica (AFM) e área de superfície específica e porosidade (BET). O foco principal do trabalho foi analisar a resposta dos materiais sintetizados como sensores de gás para a detecção de gases tóxicos e inflamáveis em baixas concentrações e em uma temperatura de operação de 300 °C. Os resultados obtidos a partir das caracterizações estruturais e morfológicas mostraram que o método de electrospinning permite a obtenção de materiais unidimensionais (1D) policristalinos com elevada homogeneidade morfológica e pureza cristalina. Além disso, os elementos químicos presentes nas estruturas de cada material sintetizado foram mapeados e identificados, onde verificou-se que todos os elementos estão homogeneamente distribuídos ao longo da estrutura das fibras. As características superficiais dos materiais, tais como rugosidade e porosidade também foram estudadas e os resultados indicaram que, dependendo da composição química das fibras, estruturas com diferentes níveis de rugosidade e área superficial podem ser obtidas. Medidas elétricas na presença de NO2, CO, H2, e CH4 mostraram que todos os materiais exibem comportamento de semicondutor do tipo-n e resposta sensora dependente da concentração do gás analito. As fibras de SnO2 e SnO2-Pt exibiram maior resposta sensora para a detecção de NO2 enquanto as fibras de SnO2-CuO e SnO2-CuO-Pt tiveram maior resposta na presença de H2, além de elevada seletividade para H2 em relação ao CH4. Em geral, os resultados obtidos mostram que os materiais produzidos são bastante promissores e têm grande potencial para serem estudados detalhadamente como sensores de gás.
In this work, the gas sensing properties of pure (SnO2) and hybrid (SnO2-Pt, SnO2-CuO and SnO2-CuO-Pt) tin oxide nanostructures were studied in the presence of different analyte gases. Materials were synthesized by electrospinning method followed by thermal treatment and subsequently characterized by thermogravimetry (TG), X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDS), atomic force microscopy (AFM) and specific surface area and porosity (BET). The main focus of the work was to analyze the gas sensor response of the synthesized materials for the detection of toxic and flammable gases in low concentrations at 300 °C. The results from the morphological and structural characterizations by XRD, SEM and TEM showed the electrospinning method allows obtaining polycrystalline 1D materials with high morphological homogeneity and crystalline purity. Furthermore, the chemical elements present in the structures of each synthesized material and it was found that all elements are homogeneously distributed throughout the fiber structures. The surface characteristics of materials, such as roughness and porosity were also studied and the results indicated that depending on the chemical composition of the fibers, structures with different levels of roughness and surface area can be obtained. Electrical measurements in the presence of NO2, H2, CO and CH4 were performed in order to verify the gas sensor properties of the nanostructures, and results showed that all materials exhibit n-type semiconducting behavior and the sensor response to be dependent on the analyte gas concentration. The SnO2 and SnO2-Pt fibers showed higher sensor response to NO2 detection while SnO2-CuO and SnO2-CuO-Pt fibers presented greater sensitivity for H2 as well as high selectivity to H2 compared to CH4. In general, the results showed that the produced materials are very promising and have high potential to be studied in detail as gas sensors materials.
FAPESP: 2012/11139-7
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3

Amin, Gul. "ZnO and CuO Nanostructures: Low Temperature Growth, Characterization, their Optoelectronic and Sensing Applications." Doctoral thesis, Linköpings universitet, Fysik och elektroteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-76677.

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Анотація:
One dimensional (1-D), zinc oxide (ZnO) and copper (II) oxide (CuO), nanostructures have great potential for applications in the fields of optoelectronic and sensor devices. Research on nanostructures is a fascinating field that has evolved during the last few years especially after the utilization of the hydrothermal growth method. Using this method variety of nanostructures can be grown from solutions, it is a cheap, easy, and environment friendly approach. These nanostructures can be synthesized on various conventional and nonconventional substrates such as silicon, plastic, fabrics and paper etc. The primary purpose of the work presented in this thesis is to realize controllable growth of ZnO, CuO and nanohybrid ZnO/CuO nanostructures and to process and develop white light emitting diodes and sensor devices from the corresponding nanostructures. The first part of the thesis deals with ZnO nanostructures grown under different hydrothermal conditions in order to gain a better understanding of the growth. Possible parameters affecting the growth such as the pH, the growth temperature, the growth time, and the precursors  concentration which can alter the morphology of the nanostructures were investigated (paper 1). Utilizing the advantage of the low temperature for growth we synthesized ZnO nanostructures on different substrates, specifically on flexible substrates, which are likely to be integrated with flexible organic substrates for future foldable and disposable electronics (paper 2, 3). In the second part of the thesis, using the results and findings from the growth of ZnO nanostructures, it was possible to successfully implement ZnO nanostructures for white light emitting diodes (LEDs) on different flexible substrates (paper 4, 5). In paper 4 we realized a ZnO/polymer LED grown on a paper substrate. In paper 5 we extended the idea to print the ZnO nanorods/polymer hybrid LEDs with potential application to large area flexible displays. In the last part of the thesis, CuO and nanohybrid ZnO/CuO nanostructures were utilized to fabricate Ag+ detection and humidity sensors. In paper 6 we reported Ag+ selective electrochemical sensor based on the use of functionalized CuO nanopetals. To combine the advantages of both oxides nanostructures and to improve the performance we fabricated a pn-heterojuction using intrinsic n-ZnO nanorods and p-CuO nanostructures which were then utilized as an efficient humidity sensor (paper 7).
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4

Elsharif, Zainelabdin Ahmed ELtahir. "Lighting and Sensing Applications of Nanostructured ZnO, CuO and Their Composites." Doctoral thesis, Linköpings universitet, Fysik och elektroteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-85111.

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Анотація:
Low dimensional nanostructures of zinc oxide (ZnO), cupric oxide (CuO), and their composite nanostructures possess remarkable physical and chemical properties. Fundamental understanding and manipulation of these unique properties are crucial for all potential applications. Integration of nanostructured ZnO and CuO and their hybrid composites may play a significant role in the existing technology while paving the way for new exciting areas. Solution based low temperature synthesis of ZnO and CuO nanostructures have attracted extensive research efforts during the last decade. These efforts resulted in a plenteous number of nanostructures ranging from quantum dots into very complex three dimensional nanomaterials. Among the various low temperature synthesis methods the hydrothermal technique became one of the most popular approaches. The use of hydrothermal approach enabled the synthesis of diversity of nanomaterials on conventional and nonconventional substrates such as metals, glass, plastic and paper etc. The primary objectives of this thesis are to study and understand the characteristics of nanostructured ZnO, CuO, and their hybrid composites synthesized at low temperature. Likewise, the hybrid composites were successfully utilized to fabricate light emitting diodes and sensors. This thesis is organized into three major parts. In the beginning the synthesis and characterization of nanostructured ZnO, CuO, and their composite nanostructures are elaborated. Efforts have been made to understand the selective assembly of hierarchical CuO nanostructures on ZnO nanorods and to correlate it to the observed unique properties of the CuO/ZnO composite nanostructures. In the second part of the thesis fabrication, characterization, and device application of ZnO/p-polymer hybrid light emitting diode (HyLEDs) on flexible substrates are presented. In particular single and blended p-type light emissive polymers were controllably developed for potential greener and cheaper white light emitters. It was found that the HyLEDs exhibited rectifying diode characteristics together with white light emission covering the entire visible range. In the third part, pH and relative humidity sensing applications of CuO nanoflowers, and CuO/ZnO nanocorals, respectively, are described. A pH sensor based on CuO nanoflowers demonstrated good sensitivity and reproducibility over a wide range of pH. By taking the advantages of the selective growth of CuO nanostructures on ZnO nanorods and their naturally formed p-n heterojunction the realization of high sensitivity humidity sensor was achieved. The humidity sensor fabricated from the CuO/ZnO nanocorals displayed the highest sensitivity factor reported so far for its constituent materials; along with reasonably fast dynamic responses. A brief outlook into future challenges and opportunities are also presented in the last part of the thesis.
Nanophotonics
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5

Zaman, Saima. "Synthesis of ZnO, CuO and their Composite Nanostructures for Optoelectronics, Sensing and Catalytic Applications." Doctoral thesis, Linköpings universitet, Institutionen för teknik och naturvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-81120.

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Анотація:
Research on nanomaterials has become increasingly popular because of their unique physical, chemical, optical and catalytic properties compared to their bulk counterparts. Therefore, many efforts have been made to synthesize multidimensional nanostructures for new and efficient nanodevices. Among those materials, zinc oxide (ZnO), has gained substantial attention owing to many outstanding properties. ZnO besides its wide bandgap of 3.34 eV exhibits a relatively large exciton binding energy (60 meV) at room temperature which is attractive for optoelectronic applications. Likewise, cupric oxide (CuO), having a narrow band gap of 1.2 eV and a variety of chemo-physical properties that are attractive in many fields. Moreover, composite nanostructures of these two oxides (CuO/ZnO) may pave the way for various new applications. This thesis can be divided into three parts concerning the synthesis, characterization and applications of ZnO, CuO and their composite nanostructures. In the first part the synthesis, characterization and the fabrication of ZnO nanorods based hybrid light emitting diodes (LEDs) are discussed. The low temperature chemical growth method was used to synthesize ZnO nanorods on different substrates, specifically on flexible non-crystalline substrates. Hybrid LEDs based on ZnO nanorods combined with p-type polymers were fabricated at low temperature to examine the advantage of both materials. A single and blended light emissive polymers layer was studied for controlling the quality of the emitted white light. The second part deals with the synthesis of CuO nanostructures (NSs) which were then used to fabricate pH sensors and exploit these NSs as a catalyst for degradation of organic dyes. The fabricated pH sensor exhibited a linear response and good potential stability. Furthermore, the catalytic properties of petals and flowers like CuO NSs in the degradation of organic dyes were studied. The results showed that the catalytic reactivity of the CuO is strongly depending on its shape. In the third part, an attempt to combine the advantages of both ZnO and CuO NSs was performed by developing a two-step chemical growth method to synthesize the composite NSs. The synthesized CuO/ZnO composite NSs revealed an extended light absorption and enhanced defect related visible emission.
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6

Gauthier, Jessica. "Fabrication et mesures de transport de nanostructures de Pr[indice inférieur 2-x]Ce[indice inférieur x]CuO[indice inférieur 4+ [delta]]." Mémoire, Université de Sherbrooke, 2005. http://savoirs.usherbrooke.ca/handle/11143/4645.

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La diminution des dimensions d’un système physique amène l’apparition de nouveaux phénomènes quantiques. C’est pourquoi on retrouve un intérêt croissant, tant dans le domaine fondamental qu’appliqué pour la fabrication de composants de plus en plus petits. Ce travail suit donc cette tendance en présentant une étude des propriétés de transport en fonction de la dimension du système dans le domaine sub-micrométrique d’échantillons de Pr[indice inférieur 2-x]Ce[indice inférieur x]CuO[indice inférieur 4+δ]. On sait déjà que des techniques de nanofabrication de composants électroniques ont été adaptées aux couches minces de matériaux supraconducteurs par plusieurs groupes de recherche. Elles n’ont, par contre, jamais été reproduites sur des couches de cuprates dopés aux électrons dont fait partie le composé Pr[indice inférieur 2-x]Ce[indice inférieur x]CuO[indice inférieur 4+δ]. Nous avons donc repris une technique de nanofabrication éprouvée pour les couches minces d’YBaCuO en espérant qu’elle conviendrait aussi à notre composé. La comparaison des propriétés de transport des systèmes nanométriques avec des échantillons macroscopiques a permis une étude des impacts de cette technique de fabrication sur notre composé. Les étapes de gravure par faisceau d’ions et d’immersion dans un plasma d’oxygène ont été pointées du doigt comme ayant un effet sur les propriétés de transport du composé. On a ainsi mis en évidence que la nanofabrication affectait la stoechiométrie de notre matériau en modifiant sa concentration en oxygène. Outre l’analyse du procédé de nanofabrication, il a été possible d’observer l’incidence qu’a la direction du courant injecté par rapport aux axes cristallins sur certaines propriétés de transport dont la magnétorésistance. De plus, les conséquences de la nanofabrication sur la stoechiométrie du composé ont été analysées par des mesures d’effet Hall.
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Buelna, Quijada Genoveva. "SYNTHESIS AND PROPERTIES OF NANOSTRUCTURED SOL-GEL SORBENTS FOR SIMULTANEOUS REMOVAL OF SULFUR DIOXIDE AND NITROGEN OXIDES FROM FLUE GAS." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1006200391.

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Д`яченко, Олексій Вікторович, Алексей Викторович Дьяченко, Oleksii Viktorovych Diachenko, Надія Миколаївна Опанасюк, Надежда Николаевна Опанасюк, Nadiia Mykolaivna Opanasiuk, Денис Ігорович Курбатов, Денис Игоревич Курбатов, Denys Ihorovych Kurbatov та H. Cheong. "Наноструктуровані плівки CuО, синтезовані методом пульсуючого спрей-піролізу". Thesis, Астропринт, 2016. http://essuir.sumdu.edu.ua/handle/123456789/46070.

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Всі відомі оксиди в нелегованому стані мають електронний тип провідності, що утруднює створення гетеропереходів на їх основі, які є обов'язковою складовою більшості приладів електроніки. Саме тому важливим є отримання та вивчення властивостей плівок оксидних матеріалів, що мають р-тип провідності, до яких зокрема відноситься оксид міді. У порівнянні з іншими методами отримання плівок оксиду міді, спрей-піроліз не вимагає дорогого вакуумного обладнання, високоякісних підкладок, забезпечує великі швидкості нанесення шарів на підкладках великої площі з різних прекурсорів. Тому, метою роботи стало вивчення властивостей плівок оксиду міді, нанесених методом пульсуючого спрей-піроліза.
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9

Eskhult, Jonas. "Electrochemical Deposition of Nanostructured Metal/Metal-Oxide Coatings." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8186.

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Vlad, Valentina Roxana. "Growth and characterization of chemical solution based nanostructured coated conductors with CeO(2) cap layers." Doctoral thesis, Universitat Autònoma de Barcelona, 2011. http://hdl.handle.net/10803/51489.

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100 años después de que el físico holandés Heike Kamerlingh Onnes descubriera que el mercurio tiene una resistencia eléctrica igual a cero, cuando se enfría en el helio líquido, los superconductores son lanzados finalmente para su uso en las redes eléctricas. Los cables superconductores pueden transportar diez veces más energía que el mismo volumen de los cables convencionales de cobre. Aunque parte de esta energía se pierde (pérdidas de corriente alterna) y se necesita usar el nitrógeno líquido para enfriar los cables superconductores y otros dispositivos, tales sistemas de energía son mucho más eficientes que las basadas en cableado de cobre, donde las pérdidas de potencia, alrededor de 7-10%, son en forma de calor. Debido a esto, países como EE.UU., Japón, Corea del Sur, China y Europa han establecido objetivos para las redes "verdes" de electricidad, reduciendo la generación de gases de efecto invernadero (CO2) y construyendo "redes inteligentes" basadas en superconductores más eficientes y robustos. Los cables superconductores de alta temperatura están hechos de un óxido de itrio, bario, cobre (YBCO) que forma parte de la familia de las cerámicas superconductoras de “alta temperatura”, descubiertas por primera vez en 1986. Las perspectivas atractivas ofrecidas por los conductores recubiertos (Coated Conductors), conocidos como la 2 ª generación de superconductores de alta temperatura (2G-HTS), han dado lugar a amplios y fructíferos esfuerzos de investigación y desarrollo para que estos sean preparados para el mercado [2]. Recientemente, LS Cable, una compañía de Corea del Sur con sede en Anyang-si, cerca de Seúl, ha ordenado tres millones de metros de cable superconductor de la firma American Superconductor desde EE.UU., en Devens, Massachusetts, que es el más alto pedido comercial de HTS CC hasta el momento [1] . Los superconductores de alta temperatura (HTS) tienen un enorme potencial para mejorar significativamente los sistemas de energía existentes, tales como cables, motores, transformadores, imanes y generadores, debido a que se puede alcanzar una mayor densidad de energía y se pueden reducir las pérdidas, comparado con los cables de cobre o cables superconductores de baja temperatura [3]. Los materiales superconductores abren tecnologías completamente nuevas en el sector de la energía, tales como limitadores de corriente o de levitación magnética inherentemente estable. Como ejemplos de aplicaciones innovadoras, deben ser mencionados sistemas avanzados de energía para barcos "all-electrical", molinos de viento en la costa y sistemas de transporte. Aunque la investigación sobre materiales HTS ha tenido mucho éxito en el pasado, el desarrollo de materiales superconductores de bajo coste sigue siendo un factor clave de éxito y, a fin de traer estos materiales emergentes en el mercado en un plazo razonable, requiere una investigación de materiales mucho más básica y aplicada. El objetivo principal de esta tesis, es el desarrollo de nuevas arquitecturas simplificadas nanoestructuradas de Coated Conductors, basadas en la deposición de soluciones químicas (CSD). Para ello, el crecimiento y la caracterización de estos Coated Conductors, se ha investigado primero sobre monocristales de YSZ, donde el CeO2 se puede crecer fácilmente como tapa tampón. El conocimiento generado puede ser útil para dos tipos de sustratos metálicos: 1.- sustratos Ni5%W RABiTS con MODLZO como capa tampón; 2.- sustratos policristalinos de Stainless Steel (SS) con ABADYSZ como capa tampón. Teniendo en cuenta la calidad de los sustratos metálicos existentes, esta tesis se ha concentrado en los sustratos policristalinos de Stainless Steel (SS), enviados por la empresa alemana Bruker HTS. El primer paso para obtener arquitecturas simplificadas fue la investigación del oxido de cerio dopado con Gd y Zr que mejor se adapta a los sustratos mencionados. El segundo paso consistió en crecer películas delgadas superconductoras de YBa2Cu3O7-x, con la ruta de los trifluoracetatos. Este trabajo comienza con una breve descripción de la superconductividad, seguido por una breve introducción sobre el compuesto superconductor YBCO y termina con los principales métodos para la obtención de películas de YBCO texturadas de alta calidad. Una caracterización completa de las muestras con diversas técnicas (Microscopía de fuerza atómica (AFM), Difracción de rayos X (DRX), Microscopía Electrónica de Barrido (SEM), Microscopía Electrónica de Transmisión (TEM), Difracción de electrones rasantes (RHEED), Deposición con láser pulsado (PLD), SQUID, Reflectividad de rayos X (XRR) y medidas eléctricas de transporte) es necesaria para comprender el mecanismo complejo de cada superconductor y las interacciones entre las diferentes capas. Han sido investigadas varias películas de óxido de cerio dopado usado como capa tampón superior, preparadas por spin coating. Los requisitos técnicos para obtener Coated Conductors de alta calidad son muy diversos. Para lograr una epitaxia de alta calidad y alta Jc, es necesario llevar a cabo una detallada caracterización morfológica y estructural por medio de SEM y DRX. La microestructura de la capa de YBCO debe estar estrechamente correlacionada con la de la capa tampón. Para estudiar más en detalle las propiedades superconductoras, se han realizado medidas inductivas y de transporte para examinar el flujo de corriente en las películas de YBCO depositadas sobre distintos sustratos. Los resultados obtenidos con las capas de CeO2 crecidas sobre ABADYSZ/SS han sido reportados. La última parte de esta tesis está dedicada al desarrollo de películas delgadas de materiales nanocompuestos de MODBaZrO3-YBa2Cu3O7-x y MODBaCeO3-YBa2Cu3O7-x usando el método químico in-situ. El zirconato de bario (BZO) es el material más atractivo para inducir centros de pinning artificiales en las películas delgadas de YBCO, con el fin de aumentar la densidad de corriente crítica. Una caracterización detallada de los nanocompuestos de BaZrO3 (BZO) crecidos por MOD será presentada a través del SEM, XRD y TEM. Referencias [1] Joseph Milton, "Superconductors come of age," Nature (2010). [2] C. Freyhardt Herbert and et al., "Coated conductors and their applications," Superconductor Science and Technology 23 (1), 010201 (2010). [3] "Nespa - NanoEngineered Superconductors for Power Applications," http://www.ifw-dresden.de/nespa.
100 years after Dutch physicist Heike Kamerlingh Onnes found that mercury has an electrical resistance of zero when cooled in liquid helium, superconductors are finally being rolled out for use in electricity grids. Superconductive wiring carries about ten times as much power as the same volume of conventional copper wiring. Although some of that power is lost (ac losses) and liquid nitrogen must be used to keep cool the superconducting cables or other devices, such power systems are still more efficient than those based on copper wiring, which losses 7-10% of the power it carries as heat. Because of this, several countries, such as USA, Japan, South Korea, China and Europe have established objectives for 'green' electricity networks reducing the greenhouse gas generation (CO2) and build more efficient and robust 'smart grids' based on the superconductors. The high temperature superconducting wires are made based on the ceramic compound yttrium barium copper oxide (YBCO), part of a family of 'high-temperature' superconducting ceramics that were first discovered in 1986. The attractive perspectives offered by coated conductors, known as the 2nd generation of high temperature superconductors (2G-HTS), have triggered broad and fruitful R&D efforts to make them ready for the market place [2]. Recently, LS Cable, a South Korean company based in Anyang-si near Seoul, has ordered three million meters of superconducting wire from the US firm American Superconductor in Devens, Massachusetts, which is the highest commercial order so far of HTS CC [1]. High Temperature Superconductors (HTS) have an enormous potential for significantly improving existing power systems, such as cables, motors, transformers, magnets and generators, because higher power densities and reduced losses can be achieved by replacing copper or low temperature superconductor wires [3]. Superconducting materials will also enable completely new technologies in the power sector, such as fault current limiters or inherently stable magnetic levitation. As examples for innovative applications, advanced energy systems for “all-electrical” ships, off-shore windmills and transportation systems should be mentioned. Although research on the materials aspects of HTS has been highly successful in the past, the development of low cost - high performance HTS materials remains a key factor of success and, in order to bring these emerging materials onto the market in a reasonable time frame, requires significantly more basic and applied materials research. The main objective of this thesis is to develop new simplified nanostructured Coated Conductors architectures based on Chemical Solution Deposition (CSD). For that, the growth and characterization of these Coated Conductors was investigated first on YSZ single crystals where CeO2-derived cap layer can be easily grown. The knowledge generated can be useful for two types of metallic substrates: 1.- MODLZO buffered Ni5%W RABiTS substrates; 2.- ABADYSZ buffered Stainless Steel (SS) polycrystalline substrates. Taking into account the quality of the existing metallic substrates, this thesis has been concentrated on ABADYSZ/SS substrates, provided by Bruker HTS, Germany. The first step for achieving simplified architectures was the investigation of Gd,Zr doped CeO2 which better adapts to the mentioned substrates. The second step consisted in growing YBa2Cu3O7-x superconducting films using the trifluoracetates route. This work starts with a brief description of the superconductivity, followed by a short introduction about the superconductive compound YBCO and ends with the principal methods for obtaining high quality textured YBCO films. A complete characterization of the samples with various techniques (Atomic Force Microscopy (AFM), X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Reflection High-Energy Electron Diffraction (RHEED), Pulsed Laser Deposition (PLD), SQUID, X-ray reflectivity (XRR) and electrical transport measurements) is necessary in order to understand the complex mechanism of each superconductor and the interactions between different layers. Various doped cerium oxide thin films used as cap layer, prepared by spin coating were also investigated. The technical requirements for high quality Coated Conductors are very diverse. To achieve a high quality epitaxy and high Jc, it is necessary to perform a detailed morphological and structural characterization by means of SEM and XRD. This microstructure of the YBCO layer needs to be closely correlated with that of the cap layer. In order to study the superconducting properties in more detail, inductive and transport measurements have been performed to examine current flow in YBCO films deposited on different substrates. The results obtained with CeO2-derived cap layers grown on Alternating Beam Assisted Deposition (ABAD) substrates were also reported. Last part of this thesis is dedicated to the development of BaZrO3-YBa2Cu3O7-x and BaCeO3-YBa2Cu3O7-x nanocomposites thin films by MOD using the in-situ approach. Barium zirconate is the most attractive material to induce artificial pinning centers both in YBCO thin films, in order to increase the critical current density. Detailed characterization by SEM, XRD and TEM of BaZrO3 (BZO) nanocomposite grown by MOD will be presented. References [1] Joseph Milton, "Superconductors come of age," Nature (2010). [2] C. Freyhardt Herbert and et al., "Coated conductors and their applications," Superconductor Science and Technology 23 (1), 010201 (2010). [3] "Nespa - NanoEngineered Superconductors for Power Applications," http://www.ifw-dresden.de/nespa.
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Книги з теми "CUO NANOSTRUCTURES"

1

Zi cui hua qi xiang sheng zhang yu yi wei na mi jie gou. Beijing: Ke xue chu ban she, 2013.

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Nami kong cai liao hua xue: Cui hua ji gong neng hua. Beijing: Ke xue chu ban she, 2013.

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Diamond, Steve. Review of OECD/OPPTS-harmonized and OPPTS ecotoxicity test guidelines for their applicability to manufactured nanomaterials. Duluth, Minn: U.S. Environmental Protection Agency, Office of Research and Development, National Health and Environmental Effects Research Laboratory, Mid-Continent Ecology Division, 2009.

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Lin, Nian, and Sebastian Stepanow. Designing low-dimensional nanostructures at surfaces by supramolecular chemistry. Edited by A. V. Narlikar and Y. Y. Fu. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780199533046.013.10.

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This article describes the use of supramolecular chemistry to design low-dimensional nanostructures at surfaces. In particular, it discusses the design strategies of two types of low-dimensional supramolecular nanostructures: structures stabilized by hydrogen bonds and structures stabilized by metal-ligand co-ordination interactions. After providing an overview of hydrogen-bond systems such as 0D discrete clusters, 1D chains, and 2D open networks and close-packed arrays, the article considers metal-co-ordination systems. It also presents experimental results showing that both hydrogen bonds and metal co-ordination offer protocols to achieve unique nanostructured systems on 2D surfaces or interfaces. Noting that the conventional 3D supramolecular self-assembly has generated a vast number of nanostructures revealing high complexity and functionality, the article suggests that 2D approaches can be applied to substrates with different symmetries as well as physical and chemical properties.
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Panigrahi, Muktikanta, and Arpan Kumar Nayak. Polyaniline based Composite for Gas Sensors. IOR PRESS, 2021. http://dx.doi.org/10.34256/ioriip212.

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In this research work, we have demonstrated the synthesis, spectroscopic characteristics, thermal behaviour and DC conductivity of a few nanostructured composites, substituted conducting polymers (ICPs) and composites of ICPs. The physical properties of aforementioned composites are significantly changed by the doping with HCl, H2SO4, HNO3, H3PO4, or acrylic acid. The charge transport properties of these polymeric materials have been studied in detail because of their potential application in gas sensors. In the current work, varieties of conducting polymer based materials such as PANI-ES/Cloisite 20A nanostructured composite, acrylic acid (AA) doped PANI polymer, N-substituted conducting polyaniline polymer, DL−PLA/PANI-ES composites, poly methyl methacrylate (PMMA) based polyaniline composite, and inorganic acid doped polyaniline are sucessfuly synthesized using aniline/aniline hydrochloride as precursors in acidic medium. Particularly, AA based synthesised PANI polymer was found with higher solubility The spectroscopic, thermal stability, enthalpy of fusion, room temperature DC conductivity and temperature dependent DC conductivity measurements with and without magnetic was carried out with as-synthesized materials. The FTR/ATR−FTIR spectra indicated the presence of different functional groups in the as-prepared composite materials. The UV−Visible absorption spectroscopic analysis showed the presence of polaron band suggesting PANI-ES form. The Room temperature DC conductivity, temperature variation DC conductivity (in presence and absence of magnetic field), and magnetoresistance (MR) of as-prepared conducting polyaniline based were analysed. The highest room temperature DC conductivity value was obtained from H2SO4 doped based composite materials and all prepared conductive composites were followed ohms law. The low temperature DC conductivity was carried out in order to study the semiconducting nature of prepared materials. The Mott type VRH model was found to be well fitted the conductivity data and described the density of states at the Fermi level which is constant in this temperature range. From MR plots, a negative MR was observed, which described the quantum interference effect on hopping conduction. We discuss different gas analytes i.e., NO2, LPG, H2, NH3, CH4, and CO of conducting polymer based materials.
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Частини книг з теми "CUO NANOSTRUCTURES"

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Zhang, W. X., Z. H. Yang, S. X. Ding, and S. H. Yang. "Synthesis and Characterization of Nanostructured CuO Array Films." In Solid State Phenomena, 303–6. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/3-908451-30-2.303.

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Lim, Loong-Tak. "Nanostructure Packaging Technologies." In Modified Atmosphere Packaging for Fresh-Cut Fruits and Vegetables, 240–65. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9780470959145.ch13.

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Cretu, V., V. Postica, N. Ababii, N. Magariu, V. Sontea, F. Schütt, R. Adelung, and O. Lupan. "Effect of Dopant on Selectivity of CuO Nanostructured Films – Based Sensors." In 3rd International Conference on Nanotechnologies and Biomedical Engineering, 349–52. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-287-736-9_84.

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Di Benedetto, Almerinda, Gianluca Landi, and Luciana Lisi. "Preferential Oxidation of Carbon Monoxide in Hydrogen-Rich Streams over CuO/CeO2 Catalysts: How Nano (and Subnano) Structure Affects Catalytic Activity and Selectivity." In Nanostructured Catalysts for Environmental Applications, 79–112. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-58934-9_3.

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Azimi, H., E. Ahmadi, and S. M. M. Hadavi. "Characteristics of Nanostructured WO3-CuO Powder Mixture Produced by Ball Milling." In Progress in Powder Metallurgy, 169–72. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-419-7.169.

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6

Al-Douri, Y., Y. Al-Douri, Y. Al-Douri, and A. S. Ibraheam. "Synthesized Cu2 Zn1-x Cdx SnS4 Quinternary Alloys Nanostructures for Optoelectronic Applications." In Green and Sustainable Advanced Materials, 209–22. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2018. http://dx.doi.org/10.1002/9781119528463.ch9.

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7

Britto Hurtado, R., Y. Delgado-Beleño, C. E. Martinez-Nuñez, M. Cortez-Valadez, and M. Flores-Acosta. "Biosynthesis and antibacterial activity of Cu and CuO nanoparticles against pathogenic microorganisms." In Copper Nanostructures: Next-Generation of Agrochemicals for Sustainable Agroecosystems, 417–52. Elsevier, 2022. http://dx.doi.org/10.1016/b978-0-12-823833-2.00013-1.

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8

Djinović, Petar, Jurka Batista, Janez Levec, and Albin Pintar. "Synthesis of ordered nanostructured CuO-CeO2 catalysts by hard template method." In Scientific Bases for the Preparation of Heterogeneous Catalysts - Proceedings of the 10th International Symposium, Louvain-la-Neuve, Belgium, July 11-15, 2010, 245–48. Elsevier, 2010. http://dx.doi.org/10.1016/s0167-2991(10)75034-5.

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9

Kumari Arodhiya, Sharmila, Jaspreet Kocher, Jiri Pechousek, Shashank Priya, Ashok Kumar, and Shyam Sundar Pattnaik. "Understanding Synthesis and Characterization of Oxide Semiconductor Nanostructures through the Example of Nanostructured Nickel Doped Hematite." In Synthesis and Applications of Semiconductor Nanostructures, 182–201. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815080117123040013.

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Hematite is an n-type semiconductor, and its semiconducting properties can further be improved by nano-structuring and doping. In several optoelectronic devices, such as thermoelectric and solar cells, both n- and p-type semiconductors are required. The p-type hematite can be synthesized by doping cations, such as Ni2+, Mg2+, Cu2+, and Mn2+. Furthermore, hematite is a weak ferromagnetic material, and its magnetic properties vary with the size of nanoparticles, doping of cations as well as doping concentration. This chapter discusses various properties of nanostructured nickel-doped hematite. As nickel is a ferromagnetic divalent dopant with a high magnetic moment, its doping in hematite together with nano-structuring shows a large variation in both electrical and magnetic properties in nickel.
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Kadarkaraithangam, Jeyasubramanian, Thangaiyanadar Suyambulingam Gokul Raja, Silambuselvan Parani Bramma Nayagi, and Karthikeyan Krishnamoorthy. "Nanostructured Materials for the Development of Superhydrophobic Coatings." In Novel Nanomaterials. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96320.

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This chapter describes the results of developing superhydrophobic coatings using porous ZnO nanostructures impregnated metal stearates and their applications. The porous ZnO nanostructures with a surface area of 9.7 m2/g and pores in the range from 200 to 400 nm have been prepared via precipitation cum calcination route. The superhydrophobic coatings comprising ZnO/metal stearate film have been deposited using a spray coating method. The developed superhydrophobic films possess a water contact angle of 161° that can be explained using the Cassie-Baxter model. The prepared films exhibited excellent floating properties and high load-bearing characteristics over a prolonged time. Additionally, the self-cleaning properties of the developed superhydrophobic films towards dust removal and self-cleaning urinary coatings are also demonstrated. This chapter collectively presented the novel applications of superhydrophobic coating in the development of biomedical coatings and applications in water surveillance and underwater robotics.
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Тези доповідей конференцій з теми "CUO NANOSTRUCTURES"

1

Enright, Ryan, Nicholas Dou, Nenad Miljkovic, Youngsuk Nam, and Evelyn N. Wang. "Condensation on Superhydrophobic Copper Oxide Nanostructures." In ASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/mnhmt2012-75277.

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Condensation is an important process in both emerging and traditional power generation and water desalination technologies. Superhydrophobic nanostructures promise enhanced condensation heat transfer by reducing the characteristic size of departing droplets via a surface-tension-driven mechanism [1]. In this work, we investigated a scalable synthesis technique to produce oxide nanostructures on copper surfaces capable of sustaining superhydrophobic condensation and characterized the growth and departure behavior of condensed droplets. Nanostructured copper oxide (CuO) films were formed via chemical oxidation in an alkaline solution. A dense array of sharp CuO nanostructures with characteristic heights and widths of ∼1 μm and ∼300 nm, respectively, were formed. A gold film was deposited on the surface and functionalized with a self-assembled monolayer to make the surfaces hydrophobic. Condensation on these surfaces was then characterized using optical microscopy (OM) and environmental scanning electron microscopy (ESEM) to quantify the distribution of nucleation sites and elucidate the growth behavior of individual droplets with a characteristic size of ∼1 to 10 μm at low supersaturations. Comparison of the observed behavior to a recently developed model for condensation on superhydrophobic surfaces [2, 3] suggests a restricted regime of heat transfer enhancement compared to a corresponding smooth hydrophobic surface due to the large apparent contact angles demonstrated by the CuO surface.
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2

Litra, Dinu, Cristian Lupan, Tudor Zadorojneac, Maxim Chiriac, Nadine Depri, Oleg Lupan, Rainer Adelung, and Leonard Siebert. "CuO-plate decorated ZnO nanostructures and their sensing performances." In 12th International Conference on Electronics, Communications and Computing. Technical University of Moldova, 2022. http://dx.doi.org/10.52326/ic-ecco.2022/el.03.

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In this paper, we report on the gas sensing properties of mixed oxide Zn-Cu nanostructures obtained by self-organized chemical deposition are presented. The nanosensors are made from individual ZnO whiskers and are coated with CuO/Cu2O. They exhibit selectivity towards H2 and NH3 over other tested gases. Measurements were made in the temperature range between 20 - 175 oC. In order to determine the crystalline phases of the studied nanostructures, XRD diffractogram was measured, and SEM images were obtained for the morphological analysis.
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3

Chand, Prakash, Anurag Gaur, and Ashavani Kumar. "Structural and optical studies of CuO nanostructures." In SOLID STATE PHYSICS: Proceedings of the 58th DAE Solid State Physics Symposium 2013. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4872566.

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4

Dakhil, Osama Abdul Azeez, Nibras M. Omran, and Baida M. Ahmed. "Prepared CuO nanostructures as gas sensor for ammonia detection." In INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS ICNAAM 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0027506.

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5

Nam, Youngsuk, and Y. Sungtaek Ju. "Comparative Study of Copper Oxidation Schemes and Their Effects on Surface Wettability." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67492.

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We present a comparative study of different oxidation methods for Cu, focusing on their effects on surface wettability for potential heat transfer applications. Various Cu2O/CuO nanostructures are formed on copper substrates using thermal and chemical oxidation methods. The morphology and chemical composition of the oxide layers are investigated using atomic force microscopy, scanning electron microscopy, and X-ray diffraction measurements. To evaluate the surface wettability, static contact angles are measured before and after each oxidation process. In thermal oxidation, the contact angle can be tailored from ∼15° to ∼90° by varying heating time (10 min ∼ 4 hrs) and temperature (150–250 °C). Chemical oxidation processes using hot alkali solutions yield stable CuO nanostructures with high roughness factors and unique morphologies, which cause significant changes in wettability. Both superhydrophilic and superhydrophobic surfaces are demonstrated using the chemical oxidation methods.
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6

Bade, Bharat R., Sachin R. Rondiya, Yogesh V. Hase, Mamta P. Nasane, Sagar B. Jathar, Sunil V. Barma, Kiran B. Kore, Dhanaraj S. Nilegave, Sandesh R. Jadkar, and Adinath M. Funde. "Hydrothermally synthesized CuO nanostructures and their application in humidity sensing." In 4TH INTERNATIONAL CONFERENCE ON EMERGING TECHNOLOGIES; MICRO TO NANO, 2019: (ETMN 2019). AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0043341.

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7

Wei, Fanan, Quan Tao, Guangyong Li, and Lianqing Liu. "A novel approach for preparation of CuO nanostructures on conductive substrate." In 2015 IEEE Nanotechnology Materials and Devices Conference (NMDC). IEEE, 2015. http://dx.doi.org/10.1109/nmdc.2015.7439267.

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8

Chen, W. G., T. Y. Gao, Q. Z. Li, and H. L. Gan. "Study on enhanced H2 gas sensing characteristics of CuO-SnO2 nanostructures." In 2014 International Conference on High Voltage Engineering and Application (ICHVE). IEEE, 2014. http://dx.doi.org/10.1109/ichve.2014.7035507.

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9

Sethuraman, R. G., R. Kannan, and T. Venkatachalam. "Effect of Mn on the structural and optical properties of CuO nanostructures." In PROCEEDINGS OF ADVANCED MATERIAL, ENGINEERING & TECHNOLOGY. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0019398.

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10

Gehlawat, Devender, R. P. Chauhan, R. G. Sonkawade, S. K. Tripathi, Keya Dharamvir, Ranjan Kumar, and G. S. S. Saini. "Experimental conditions induced variation in Texture Coefficient of Crystal planes in Cu∕CuO Nanostructures." In INTERNATIONAL CONFERENCE ON ADVANCES IN CONDENSED AND NANO MATERIALS (ICACNM-2011). AIP, 2011. http://dx.doi.org/10.1063/1.3653656.

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Звіти організацій з теми "CUO NANOSTRUCTURES"

1

Billinge, Simon J. L. Nanostructure Determination by Co-Refining Models to Multiple Datasets. Office of Scientific and Technical Information (OSTI), May 2011. http://dx.doi.org/10.2172/1164153.

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2

Metiu, Horia. Catalysis by Nanostructures: Methane, Ethylene Oxide, and Propylene Oxide Synthesis on Ag, Cu or Au Nanoclusters. Fort Belvoir, VA: Defense Technical Information Center, February 2008. http://dx.doi.org/10.21236/ada477455.

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