Bibliografie tematiche / Nanowires Ag(Cu)/GDC

Letteratura scientifica selezionata sul tema "Nanowires Ag(Cu)/GDC"

Autore: Grafiati

Pubblicato: 8 giugno 2024

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Articoli di riviste sul tema "Nanowires Ag(Cu)/GDC":

Wang, Yuanxing, Cailing Niu e Yachuan Zhu. "Copper–Silver Bimetallic Nanowire Arrays for Electrochemical Reduction of Carbon Dioxide". Nanomaterials 9, n. 2 (30 gennaio 2019): 173. http://dx.doi.org/10.3390/nano9020173.

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The electrochemical conversion of carbon dioxide (CO2) into gaseous or liquid fuels has the potential to store renewable energies and reduce carbon emissions. Here, we report a three-step synthesis using Cu–Ag bimetallic nanowire arrays as catalysts for electrochemical reduction of CO2. CuO/Cu2O nanowires were first grown by thermal oxidation of copper mesh in ambient air and then reduced by annealing in the presence of hydrogen to form Cu nanowires. Cu–Ag bimetallic nanowires were then produced via galvanic replacement between Cu nanowires and the Ag+ precursor. The Cu–Ag nanowires showed enhanced catalytic performance over Cu nanowires for electrochemical reduction of CO2, which could be ascribed to the incorporation of Ag into Cu nanowires leading to suppression of hydrogen evolution. Our work provides a method for tuning the selectivity of copper nanocatalysts for CO2 reduction by controlling their composition.

Sun, Yang, Fengying Zhang, Li Xu, Zhilei Yin e Xinyu Song. "Roughness-controlled copper nanowires and Cu nanowires–Ag heterostructures: synthesis and their enhanced catalysis". J. Mater. Chem. A 2, n. 43 (2014): 18583–92. http://dx.doi.org/10.1039/c4ta03689a.

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Chang, Tung-Hao, Hsin-Wei Di, Yu-Cheng Chang e Chia-Man Chou. "Ag Nanoparticles Decorated CuO@RF Core-Shell Nanowires for High-Performance Surface-Enhanced Raman Spectroscopy Application". Molecules 27, n. 23 (2 dicembre 2022): 8460. http://dx.doi.org/10.3390/molecules27238460.

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Vertical-aligned CuO nanowires have been directly fabricated on Cu foil through a facile thermal oxidation process by a hotplate at 550 °C for 6 h under ambient conditions. The intermediate layer of resorcinol–formaldehyde (RF) and silver (Ag) nanoparticles can be sequentially deposited on Cu nanowires to form CuO@RF@Ag core-shell nanowires by a two-step wet chemical approach. The appropriate resorcinol weight and silver nitrate concentration can be favorable to grow the CuO@RF@Ag nanowires with higher surface-enhanced Raman scattering (SERS) enhancement for detecting rhodamine 6G (R6G) molecules. Compared with CuO@Ag nanowires grown by ion sputtering, CuO@RF@Ag nanowires exhibited a higher SERS enhancement factor of 5.33 × 108 and a lower detection limit (10−12 M) for detecting R6G molecules. This result is ascribed to the CuO@RF@Ag nanowires with higher-density hot spots and surface-active sites for enhanced high SERS enhancement, good reproducibility, and uniformity. Furthermore, the CuO@RF@Ag nanowires can also reveal a high-sensitivity SERS-active substrate for detecting amoxicillin (10−10 M) and 5-fluorouracil (10−7 M). CuO@RF@Ag nanowires exhibit a simple fabrication process, high SERS sensitivity, high reproducibility, high uniformity, and low detection limit, which are helpful for the practical application of SERS in different fields.

Xu, Jiaxing, Jianjun Gao, Hongling Qin, Zhiyang Liu, Linpeng Zhu, Haibin Geng, Ligang Yao e Zhilong Zhao. "Cu Nanowires and Nanoporous Ag Matrix Fabricated through Directional Solidification and Selective Dissolution of Ag–Cu Eutectic Alloys". Materials 15, n. 22 (18 novembre 2022): 8189. http://dx.doi.org/10.3390/ma15228189.

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Cu nanowires and a nanoporous Ag matrix were fabricated through directional solidification and selective dissolution of Ag–Cu eutectic alloys. Ag-39.9at.%Cu eutectic alloys were directionally solidified at growth rates of 14, 25, and 34 μm/s at a temperature gradient of 10 K/cm. The Cu phase in the Ag matrix gradually changed from lamellar to fibrous with an increase in the growth rate. The Ag matrix phase was selectively dissolved, and Cu nanowires of 300–600 nm in diameter and tens of microns in length were prepared in 0.1 M borate buffer with a pH of 9.18 at a constant potential of 0.7 V (vs. SCE). The nanoporous Ag matrix was fabricated through selective dissolution of Cu fiber phase in 0.1 M acetate buffer with a pH of 6.0 at a constant potential of 0.5 V (vs. SCE). The diameter of Ag pores decreased with increasing growth rate. The diameter and depth of Ag pores increased when corrosion time was extended. The depth of the pores was 30 μm after 12 h.

Khan, Babar Shahzad, Aiman Mukhtar, Tahir Mehmood e Ming Tan. "Polarization Curves of Electrodepositing Ag and Cu Nanowires". Journal of Nanoscience and Nanotechnology 16, n. 9 (1 settembre 2016): 9896–900. http://dx.doi.org/10.1166/jnn.2016.12569.

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Yan, Siyi, Qiaohui Yue e Jiangang Ma. "Rapid fabrication of silver–cuprous oxide core–shell nanowires for visible light photocatalysts". CrystEngComm 23, n. 1 (2021): 24–29. http://dx.doi.org/10.1039/d0ce01430c.

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Exconde, Mark Keanu James, e Mary Donnabelle L. Balela. "Parametric Study of the Galvanic Reaction Parameters on the Synthesis of 1-Dimensional Cu-Ag Nanostructures". Materials Science Forum 1097 (27 settembre 2023): 131–37. http://dx.doi.org/10.4028/p-d6zsd0.

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Recently, copper (Cu) and silver (Ag) nanowires have been widely employed as conductive fillers in flexible electronic devices due to their high aspect ratios leading to the formation of conductive networks in a polymeric substrate. This study combined Cu and Ag as a 1-dimensional nanostructures through galvanic replacement with a core-shell configuration. The effects of the galvanic replacement factors on the Cu-Ag core-shell nanostructures morphology was studied by varying the reaction time, temperature, and Ag concentration. SEM images show a more extensive Cu dealloying and Kirkendall voiding with longer reaction times, resulting in the Cu core dissolution. Homogenous nucleation of Ag occurs at higher reaction temperatures and Ag concentrations, producing separate Ag particles.

Brandstetter, Thomas, Thorsten Wagner, Daniel R. Fritz e Peter Zeppenfeld. "Tunable Ag Nanowires Grown on Cu(110)-Based Templates". Journal of Physical Chemistry Letters 1, n. 7 (5 marzo 2010): 1026–29. http://dx.doi.org/10.1021/jz100068e.

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Ding, X., G. Briggs, W. Zhou, Q. Chen e L.-M. Peng. "In situgrowth and characterization of Ag and Cu nanowires". Nanotechnology 17, n. 11 (19 maggio 2006): S376—S380. http://dx.doi.org/10.1088/0957-4484/17/11/s24.

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Balela, Mary Donnabelle L., Salvacion B. Orgen e Michael R. Tan. "Fabrication of Highly Flexible Copper Nanowires in Dual Surfactant Hydrothermal Process". Journal of Nanoscience and Nanotechnology 19, n. 11 (1 novembre 2019): 7156–62. http://dx.doi.org/10.1166/jnn.2019.16714.

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Highly flexible Cu nanowires were successfully synthesized by a dual-surfactant hydrothermal process using oleylamine and oleic acid. The ultra-long Cu nanowires have a mean diameter as low as 82.3 nm and lengths greater than 300 μm. It was found that reaction time and oleylamine concentration significantly influenced the morphology and phase composition of the Cu products. At a shorter reaction time (about 4 hours), pentagonal bipyramidal CU2O particles were precipitated together with the Cu nanowires. A longer reaction time of 12 hours resulted in smooth and purely metallic Cu nanowires. It is possible that CU2O served as an intermediate phase to control the activity of free CU2+ ions in the solution. On the other hand, a higher oleylamine concentration generally produced longer Cu nanowires. Cu nanowires conducting electrode with a sheet resistance of about 157.0 Ω/□ were fabricated. However, the optical transmittance of the electrode at 550 nm was very low (<20%) because of the agglomeration of the Cu nanowires. The addition of a small quantity of Ag nanowires in the Cu nanowire ink markedly improved the appearance and electrical properties of the resulting electrode.

Più fonti

Tesi sul tema "Nanowires Ag(Cu)/GDC":

Gilbert, Benjamin. "Synthèse de films nanocomposites Ag/YSZ, Ag/CGO & Ag(Cu)/CGO par pulvérisation cathodique magnétron réactive pour l’électrocatalyse de l’éthylène en oxyde d’éthylène". Electronic Thesis or Diss., Université de Lorraine, 2020. http://www.theses.fr/2020LORR0257.

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L’oxyde d’éthylène (OE) est un précurseur de nombreuses réactions de chimie fine. Il est produit par la réaction d’époxydation de l’éthylène sur un catalyseur à base d’argent. Néanmoins, afin d’atteindre des sélectivités élevées, le procédé industriel utilise des additifs chlorés dans la phase gaz peu écologiques et des modérateurs alcalins sur le catalyseur. L’objectif de cette étude est d’augmenter la sélectivité vers OE sans utilisation de promoteurs chlorés grâce à des électrocatalyseurs Ag/oxydes à structure fluorite synthétisés en couche mince par pulvérisation cathodique magnétron en atmosphère réactive à haute pression. Durant les tests de catalyse les électrocatalyseurs ont été polarisés dans des cellules en configuration 3 électrodes dédiées à la promotion électrochimique de la catalyse, EPOC. Trois systèmes poreux (Ag/YSZ, Ag/CGO & Ag(Cu)/CGO) ont été développés par pulvérisation cathodique magnétron. Le film Ag/YSZ 4 Pa 25 mA présente une microstructure botryoïde caractéristiques d’une séparation des charges d’argent et de la matrice YSZ. Le film nanocomposite Ag/CGO 4 Pa 70 mA présente une morphologie ouverte de type cerveau avec des nano porosités débouchantes. Enfin, le film Ag(Cu)/CGO 4 Pa 70 mA est constitué de nanofils hydrophobes multiphasés entropique. Durant les tests en conditions d’époxydation de l’éthylène en milieu réducteur, le film Ag/CGO 4 Pa 70 mA a présenté un maximum de sélectivité vers OE de 16,55 % à 220 °C et, sous polarisation, la sélectivité a pu être augmentée de 2,78 % sans modification de la vitesse de réaction par effet NEMCA
Ethylene oxide (EO) is an essential building block for the chemical industry. It is produced by the ethylene epoxidation reaction over a silver-based catalyst. Nevertheless, to achieve high selectivity, industrial processes use chloride additives in the gas phase and alkaline moderators on the catalyst. The aim of this study is to increase EO selectivity without chloride additives thanks to Ag/fluorite oxides electrocatalysts synthesized by reactive magnetron sputtering and incorporated in a 3-electrodes configuration cell designed for electrochemical promotion of catalysis, EPOC. Three porous systems (Ag/YSZ, Ag/GDC, Ag(Cu)/GDC) have been synthesized by reactive magnetron sputtering. Ag/YSZ 4 Pa 25 mA nanocomposite thin film exhibits a botryoidal microstructure characteristic of silver segregation inside the YSZ matrix. Ag/GDC 4 Pa 70 mA nanocomposite thin film exhibits a brain like-morphology with open nanoporosities. Ag(Cu)/GDC 4 Pa 70 mA nanocomposite thin film consists of multi-phase hydrophobic entropic nanowires. During catalytic tests under ethylene epoxidation conditions in reducing medium, Ag/GDC 4 Pa 70 mA showed the maximum EO selectivity of 16.55 % at 220 °C and, under polarization, selectivity boost of 2.78 % occur without the appearance of NEMCA effect

Hsu, Chin Yu, e 許晉瑜. "Synthesis and characterization of Cu−Ag core-shell nanowires for transparent conductive film applications". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/13928614698651458716.

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碩士
國立清華大學
材料科學工程學系
104
Transparent conductive films (TCFs) are essential components in many optoelectronic devices. Indium tin oxide (ITO) that possesses high transmittance ( > 90 T%) and low sheet resistances ( <10 Ωsq−1 ) has been widely employed in TCFs. The development of flexible electronic devices drives the need of the TCFs on flexible substrates. However, the brittleness of ITO and the low throughput of the vapor-phase sputtering process on plastic substrate restricted the applicability of ITO on the flexible electronic devices. Looking for alternatives to the next-generation TCFs becomes imperative. Cu nanowires (NWs) have become a promising alternative solution for TCFs by forming a NW network on a transparent substrate. Cu NWs have superior electrical conductivity and flexibility. Nano-twinned Cu NWs have exhibited high mechanical strength, good conductivity, and moreover, superior electromigration resistance, which can be an excellent material to the NW-based TCFs. Still, the sheet resistance of Cu NWs films can easily increase due to the formation of copper oxides and leads to a severe reliability issue. In this study, Cu NWs were synthesized by pulsed electrodeposition with porous anodic aluminum oxide (AAO) templates at low temperature. To improve their anti-oxidation property, we develop a method that can uniformly coat a thin layer of silver on the Cu NWs through a galvanic replacement reaction. The microstructure of Cu NWs and silver shell have been examined by transmission electron microscopy (TEM). The evolution of electrical resistivity for single Cu-Ag NWs was measured as a function of time by a four-point probe method. A transfer printing approach was used to fabricate the TCFs with Cu-Ag NWs. The pressure applied for the transfer printing process has been optimized to obtain a TCF with RS = 41 Ω/sq and T = 88.9 %, which gives a good figure of merit (FOM) up to 70. The Cu-Ag NWs film has demonstrated good anti-oxidation ability after thermal aging at 85 °C for 300 hours. Meanwhile, the sheet resistance of Cu-Ag NWs film remained unchanged after 1000 bending cycles, which shows the film has excellent flexibility. In summary, the Cu-Ag core-shell NWs show the good chemical stability that are able to improve the performance and reliability of the Cu NWs-based TCFs.

Capitoli di libri sul tema "Nanowires Ag(Cu)/GDC":

Naghib, Seyed Morteza, Seyed Mahdi Katebi e Sadegh Ghorbanzade. "Material and Biomaterial for Biosensing Platform". In Electrochemical Biosensors in Practice: Materials and Methods, 59–104. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815123944123010004.

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The fourth chapter focuses on essential materials for biosensing platform research, including graphene, carbon nanotubes, conductive polymer, and other advanced materials. This chapter describes the function of each biosensing platform and the most recent advances in the synthesis and application of advanced materials. After three sections on the subject's fundamentals, this and the following two chapters present experimental and research-relevant material. For this purpose, carbon-based materials will be examined first, including the following categories: fluorines, carbon nanotubes, graphene, nanodiamonds of carbons, carbon nanohorns, carbon dots, and carbon nanofibers. This section examines the research on these materials and the types of conductive polymers utilized in electrochemical biosensors. Several polymers and their functional techniques, including MNPPFs, MIP/SIPs, and dendrimers, are examined in the following sections. The nanoparticles, such as Au, Pt, Ag, Pd, Ni, Cu, Fe2O3 , TiO2 , ZnO, zeolites and other aluminosilicates, inorganic quantum dots, doped inorganic NMs, nanowires, Carbon black, and calixarenes, are then investigated. Then, biological materials are examined, including enzymatic nanocomposites, nucleic acid nanocomposites, immunoassay-based nanocomposites, aptamers, and biopolymeric nanocomposites. Finally, sandwich- or composite-based biosensor materials are discussed.

Atti di convegni sul tema "Nanowires Ag(Cu)/GDC":

Ng, Poh-Keong, Brandon Fisher, Ke-Bin Low, Matthias Bode e Carmen M. Lilley. "Self assembled bimetallic Ag/Cu-Si nanowires on Si(001) synthesized with e-beam evaporation". In 2012 IEEE 12th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2012. http://dx.doi.org/10.1109/nano.2012.6322114.

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