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Journal articles on the topic 'Bi-metallic core-shell'

Author: Grafiati
Published: 6 September 2023

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1

Ilker, Efe, Melihat Madran, Mine Konuk, and Sondan Durukanoğlu. "Growth and shape stability of Cu–Ni core–shell nanoparticles: an atomistic perspective." Chemical Communications 54, no. 96 (2018): 13583–86. http://dx.doi.org/10.1039/c8cc05966g.

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2

Mukherji, D. "A Novel Method for the Synthesis of Core-shell Magnetic Nanoparticle." Defence Science Journal 66, no. 4 (June 28, 2016): 291. http://dx.doi.org/10.14429/dsj.66.10203.

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<p>Core-shell type magnetic nanoparticles are finding attractive applications in biomedicine, from diagnostic to cancer therapy. Both for targeted drug delivery and hyperthermia, as well as a contrast agent used for external biomedical imaging systems, small (&lt; 20 nm) superparamagnetic nanoparticles are desired. Some iron oxide nanoparticle formulations are already approved for human administration as contrast agent for magnetic resonance imaging. However, search continues for nanoparticles with higher saturation magnetisation. Metallic, bi-metallic and intermetallic magnetic nanoparticles are finding attention. Biocompatibility and optimal clearance are important criteria for the medical applications and therefore core-shell type particles are favored, where a biocompatible shell (e.g. polymer, Silica) can prevent inadvertent host reaction with the magnetic core. A recently developed novel synthesis method (electrochemical selective phase dissolution - ESPD), which can produce core-shell magnetic nanoparticles, is reviewed in this paper. ESPD, as the name suggests, uses electro-chemical separation of a phase from metallic alloys to synthesize nanoparticles. It is a versatile method and can be adopted to produce a wide range of nanostructures in addition to the core-shell magnetic nanoparticles.</p>
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3

Fouad, Osama A., Fatma Morsy, Samya El-Sherbiny, and Diaa Abd Elshafy. "Metal Nanoparticles Based Inkjet Ink for Advanced Circuit Board Application." Journal of Nanotechnology in Diagnosis and Treatment 5 (February 27, 2017): 1–10. http://dx.doi.org/10.12974/2311-8792.2017.05.1.

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This study investigates the synthesis of mono metallic (copper and silver) and bi-metallic (copper/silver core/shell) conductive nanopigments for inkjet printing. Polyethylene glycol (PEG) was used as a main reducing agent followed by polyvinylpyrrolidone (PVP) as a capping and dispersing agent. From the XRD, TEM, and SEM analyses, the synthesized mono and bi metallic particles were con?rmed to be in a nano scale with particle size 7, 8.5 and 15.5 nm for copper, silver and copper/silver core/shell, respectively. The prepared nanopigments were included in inkjet ink formulation and printed on flexible polyethylene terephthalate (PET) films. The printed ink films were sintered at various temperatures (110, 150, 200). The results revealed that the resistivity of these particles was reduced by sintering and the resistivity of Cu, Ag and Cu/Ag patterns sintered in air at 200 ºC for 30 min were 3.1, 2.99 and 4.14 µ?-cm, respectively. The obtained results were in a good agreement with the published ones and insured the promising using of our products in metal-based inkjet printed circuit boards (PCB).
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4

Manivannan, Shanmugam, and Ramasamy Ramaraj. "Polymer-embedded gold and gold/silver nanoparticle-modified electrodes and their applications in catalysis and sensors." Pure and Applied Chemistry 83, no. 11 (July 11, 2011): 2041–53. http://dx.doi.org/10.1351/pac-con-11-03-04.

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Metal nanoparticles encapsulated by silicate sol-gel matrix find numerous applications particularly in electrocatalysis and sensors. In our previous reports, we have reported the mono- and bi-metal gold, silver, and core/shell gold/silver nanoparticles embedded in functionalized silicate sol-gel matrices. Modified electrodes were fabricated using mono- and bi-metallic gold, silver, and core/shell gold/silver nanoparticles embedded in silicate sol-gel, and they were used for the electrocatalysis and sensing of H2O2 and simultaneous detection of hydrazine, sulfite, and nitrite. We have prepared the gold nanoparticles encapsulated by amine-functionalized silicate sol-gel matrix in a single step without using any external reducing agents. The gold nanoparticles were also synthesized by using amine-functionalized silane monomer in the presence of β-cyclodextrin (β-CD), resulting in metal/polymer core/shell nanostructures. This nanocomposite material showed a synergistic stabilizing effect when compared to either silicate sol-gel matrix or β-CD alone as stabilizer. The synthesized gold nanoparticles were characterized using UV–vis spectroscopy and high-resolution transmission electron microscopy. Modified electrodes were prepared by using the gold nanoparticles embedded in silicate sol-gel matrix, and their electrochemical characteristics were studied.
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5

Anjum, Dalaver H., Akshaya Samal, and Manuel A. Roldan-Gutierrez. "Characterization of core/shell bi-metallic cube-shaped nanoparticles with scanning transmission electron microscopy." Microscopy and Microanalysis 21, S3 (August 2015): 1069–70. http://dx.doi.org/10.1017/s1431927615006133.

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6

Hajar, Yasmine M., Balaji Venkatesh, Mohamed S. E. Houache, Hanshuo Liu, Reza Safari, Sagar Prabhudev, Gianluigi A. Botton, and Elena A. Baranova. "Electrochemical promotion of Bi-metallic Ni9Pd core double-shell nanoparticles for complete methane oxidation." Journal of Catalysis 374 (June 2019): 127–35. http://dx.doi.org/10.1016/j.jcat.2019.04.026.

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7

Allaire, Ryan H., Abhijeet Dhakane, Reece Emery, P. Ganesh, Philip D. Rack, Lou Kondic, Linda Cummings, and Miguel Fuentes-Cabrera. "Surface, Interface, and Temperature Effects on the Phase Separation and Nanoparticle Self Assembly of Bi-Metallic Ni0.5Ag0.5: A Molecular Dynamics Study." Nanomaterials 9, no. 7 (July 21, 2019): 1040. http://dx.doi.org/10.3390/nano9071040.

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Classical molecular dynamics (MD) simulations were used to investigate how free surfaces, as well as supporting substrates, affect phase separation in a NiAg alloy. Bulk samples, droplets, and droplets deposited on a graphene substrate were investigated at temperatures that spanned regions of interest in the bulk NiAg phase diagram, i.e., miscible and immiscible liquid, liquid-crystal, and crystal-crystal regions. Using MD simulations to cool down a bulk sample from 3000 K to 800 K, it was found that phase separation below 2400 K takes place in agreement with the phase diagram. When free surface effects were introduced, phase separation was accompanied by a core-shell transformation: spherical droplets created from the bulk samples became core-shell nanoparticles with a shell made mostly of Ag atoms and a core made of Ni atoms. When such droplets were deposited on a graphene substrate, the phase separation was accompanied by Ni layering at the graphene interface and Ag at the vacuum interface. Thus, it should be possible to create NiAg core-shell and layer-like nanostructures by quenching liquid NiAg samples on tailored substrates. Furthermore, interesting bimetallic nanoparticle morphologies might be tuned via control of the surface and interface energies and chemical instabilities of the system.
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8

Sun, Wang, Huacong Chu, Junyan Liu, Na Wang, and Yang Wang. "A core-shell heterostructured hybrid nanomaterial of bi-metallic MOFs and COFs: Improved 2,4,6-trichlorophenol charge collection." Sensors and Actuators B: Chemical 393 (October 2023): 134146. http://dx.doi.org/10.1016/j.snb.2023.134146.

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9

Avşar, Dilan, Hakan Ertürk, and M. Pınar Mengüç. "Absorption and plasmon resonance of Bi-metallic core-shell nanoparticles on a dielectric substrate near an external tip." Journal of Quantitative Spectroscopy and Radiative Transfer 241 (January 2020): 106684. http://dx.doi.org/10.1016/j.jqsrt.2019.106684.

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10

Song, Sin-Mao, Pei-Chun Wong, Chih-Wei Chiang, Pei-Hua Tsai, J. S. C. Jang, and Chih-Hwa Chen. "A bi-phase core–shell structure of Mg-based bulk metallic glass for application in orthopedic fixation implants." Materials Science and Engineering: C 111 (June 2020): 110783. http://dx.doi.org/10.1016/j.msec.2020.110783.

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11

Korir, Daniel K., Bharat Gwalani, Abel Joseph, Brian Kamras, Ravi K. Arvapally, Mohammad A. Omary, and Sreekar B. Marpu. "Facile Photochemical Syntheses of Conjoined Nanotwin Gold-Silver Particles within a Biologically-Benign Chitosan Polymer." Nanomaterials 9, no. 4 (April 11, 2019): 596. http://dx.doi.org/10.3390/nano9040596.

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A simple photochemical method for making conjoined bi-metallic gold-silver (Au/Ag) nanotwins, a new breed of nanoparticles (NPs), is developed. To the best of our knowledge, the photochemical method resulted in distinct, conjoined, bimetallic nanotwins that are different from any well-established alloyed or core-shell nanostructures in the literature. The conjoined Au-Ag NPs possessed surface plasmon resonance (SPR) properties of both metals. The bimetallic nanostructures possessing distinctive optical properties of both metals were obtained using Au NPs as seeds in the first step, followed by the addition of a silver precursor as feed in the second step during a photochemical irradiation process. In the first step, small, isotropic or large, anisotropic Au NPs are generated by photoinduced reduction within a biocompatible chitosan (CS) polymer. In the second step, a silver precursor (AgNO3) is added as the feed to the AuNPs seed, followed by irradiation of the solution in the ice-bath. The entire photochemical irradiation process resulting in the formation of bimetallic Au-AgNPs did not involve any other reducing agents or stabilizing agents other than the CS polymer stabilizer. The small, conjoined Au-Ag bi-metallic NPs exhibited SPR with peak maxima centering at ~400 nm and ~550 nm, whereas the large conjoined nanoparticles exhibited SPR with peak maxima centering at ~400 nm, 550 nm, and 680 nm, characteristic of both gold and silver surface plasmons in solution. The tunability in the SPR and size of the bimetallic NPs were obtained by varying the reaction time and other reaction parameters, resulting in average sizes between 30 and 100 nm. The SPR, size, distribution, and elemental composition of the bi-metallic NPs were characterized using UV-Vis absorption, electron microscopy, and energy dispersive X-ray spectroscopy (EDS) studies.
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12

Mamonova, Daria V., Anna A. Vasileva, Yuri V. Petrov, Alexandra V. Koroleva, Denis V. Danilov, Ilya E. Kolesnikov, Gulia I. Bikbaeva, Julien Bachmann, and Alina A. Manshina. "Single Step Laser-Induced Deposition of Plasmonic Au, Ag, Pt Mono-, Bi- and Tri-Metallic Nanoparticles." Nanomaterials 12, no. 1 (December 31, 2021): 146. http://dx.doi.org/10.3390/nano12010146.

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Multimetallic plasmonic systems usually have distinct advantages over monometallic nanoparticles due to the peculiarity of the electronic structure appearing in advanced functionality systems, which is of great importance in a variety of applications including catalysis and sensing. Despite several reported techniques, the controllable synthesis of multimetallic plasmonic nanoparticles in soft conditions is still a challenge. Here, mono-, bi- and tri-metallic nanoparticles were successfully obtained as a result of a single step laser-induced deposition approach from monometallic commercially available precursors. The process of nanoparticles formation is starting with photodecomposition of the metal precursor resulting in nucleation and the following growth of the metal phase. The deposited nanoparticles were studied comprehensively with various experimental techniques such as SEM, TEM, EDX, XPS, and UV-VIS absorption spectroscopy. The size of monometallic nanoparticles is strongly dependent on the type of metal: 140–200 nm for Au, 40–60 nm for Ag, 2–3 nm for Pt. Bi- and trimetallic nanoparticles were core-shell structures representing monometallic crystallites surrounded by an alloy of respective metals. The formation of an alloy phase took place between monometallic nanocrystallites of different metals in course of their growth and agglomeration stage.
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13

Jin, Rongchao. "The impacts of nanotechnology on catalysis by precious metal nanoparticles." Nanotechnology Reviews 1, no. 1 (January 1, 2012): 31–56. http://dx.doi.org/10.1515/ntrev-2011-0003.

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AbstractThis review article focuses on the impacts of recent advances in solution phase precious metal nanoparticles on heterogeneous catalysis. Conventional nanometal catalysts suffer from size polydispersity. The advent of nanotechnology has significantly advanced the techniques for preparing uniform nanoparticles, especially in solution phase synthesis of precious metal nanoparticles with excellent control over size, shape, composition and morphology, which have opened up new opportunities for catalysis. This review summarizes some recent catalytic research by using well-defined nanoparticles, including shape-controlled nanoparticles, high index-faceted polyhedral nanocrystals, nanostructures of different morphology (e.g., core-shell, hollow, etc.), bi- and multi-metallic nanoparticles, as well as atomically precise nanoclusters. Such well-defined nanocatalysts provide many exciting opportunities, such as identifying the types of active surface atoms (e.g., corner and edge atoms) in catalysis, the effect of surface facets on catalytic performance, and obtaining insight into the effects of size-induced electron energy quantization in ultra-small metal nanoparticles on catalysis. With well-defined metal nanocatalysts, many fundamentally important issues are expected to be understood much deeper in future research, such as the nature of the catalytic active sites, the metal-support interactions, the effect of surface atom arrangement, and the atomic origins of the structure-activity and the structure-selectivity relationships.
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14

Kostuch, Aldona, Iwona A. Rutkowska, Beata Dembinska, Anna Wadas, Enrico Negro, Keti Vezzù, Vito Di Noto, and Pawel J. Kulesza. "Enhancement of Activity and Development of Low Pt Content Electrocatalysts for Oxygen Reduction Reaction in Acid Media." Molecules 26, no. 17 (August 25, 2021): 5147. http://dx.doi.org/10.3390/molecules26175147.

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Platinum is a main catalyst for the electroreduction of oxygen, a reaction of primary importance to the technology of low-temperature fuel cells. Due to the high cost of platinum, there is a need to significantly lower its loadings at interfaces. However, then O2-reduction often proceeds at a less positive potential, and produces higher amounts of undesirable H2O2-intermediate. Hybrid supports, which utilize metal oxides (e.g., CeO2, WO3, Ta2O5, Nb2O5, and ZrO2), stabilize Pt and carbon nanostructures and diminish their corrosion while exhibiting high activity toward the four-electron (most efficient) reduction in oxygen. Porosity of carbon supports facilitates dispersion and stability of Pt nanoparticles. Alternatively, the Pt-based bi- and multi-metallic catalysts, including PtM alloys or M-core/Pt-shell nanostructures, where M stands for certain transition metals (e.g., Au, Co, Cu, Ni, and Fe), can be considered. The catalytic efficiency depends on geometric (decrease in Pt–Pt bond distances) and electronic (increase in d-electron vacancy in Pt) factors, in addition to possible metal–support interactions and interfacial structural changes affecting adsorption and activation of O2-molecules. Despite the stabilization of carbons, doping with heteroatoms, such as sulfur, nitrogen, phosphorus, and boron results in the formation of catalytically active centers. Thus, the useful catalysts are likely to be multi-component and multi-functional.
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15

Pandit, Sanchaya, Sundar Kunwar, Rakesh Kulkarni, Rutuja Mandavka, Shusen Lin, and Jihoon Lee. "Fabrication of hybrid Pd@Ag core-shell and fully alloyed bi-metallic AgPd NPs and SERS enhancement of Rhodamine 6G by a unique mixture approach with graphene quantum dots." Applied Surface Science 548 (May 2021): 149252. http://dx.doi.org/10.1016/j.apsusc.2021.149252.

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16

Wong, Pei-Chun, Sin-Mao Song, Yi-Yuan Nien, Wei-Ru Wang, Pei-Hua Tsai, Jia-Lin Wu, and J. S. C. Jang. "Mechanical properties enhanced by the dispersion of porous Mo particles in the biodegradable solid and bi-phase core–shell structure of Mg-based bulk metallic glass composites for applications in orthopedic implants." Journal of Alloys and Compounds 877 (October 2021): 160233. http://dx.doi.org/10.1016/j.jallcom.2021.160233.

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17

Akbarbandari, Fatemeh, Mohammad Zabihi, and Morteza Faghihi. "Synthesis of the magnetic core–shell bi‐metallic and tri‐metallic metal–organic framework nanocomposites for dye adsorption." Water Environment Research, December 6, 2020. http://dx.doi.org/10.1002/wer.1481.

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18

Tan, Jeannie Ziang Yie, Ashween Kaur Virdee, John Andresen, and Mercedes Maroto-Valer. "Core-shell Nanostructured Cu-based Bi-metallic Electrocatalysts for Co-production of Ethylene and Acetate." Faraday Discussions, 2023. http://dx.doi.org/10.1039/d3fd00058c.

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Direct electrocatalytic CCU routes to produce a myriad of valuable chemicals (e. g., methanol, acetic acid, ethylene, propanol, among others) will allow the chemical industry to shift away from the...
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19

Sinha, Shyam Kanta, Arup Dasgupta, M. Sivakumar, Chanchal Ghosh, and S. Raju. "Unraveling the Complexity of Nano-Dispersoids in the Oxide Dispersion Strengthened Alloy 617." Microscopy and Microanalysis, May 26, 2022, 1–9. http://dx.doi.org/10.1017/s143192762200071x.

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Abstract Nanocrystalline oxides are mainly responsible for Ni-base oxide dispersion strengthened (ODS) superalloys excellent thermo-mechanical properties. To establish the microstructural correlations between the metallic matrix and various oxide dispersoids, we report here the atomic-scale structure and chemistry of the complex nano-oxide dispersoids. Ultrahigh-resolution Cs-aberration-corrected scanning transmission electron microscopy (STEM) based techniques have been used to resolve nano-dispersoids in the Alloy 617 ODS. These nano-oxides, interestingly, possess a variety of high-angle annular dark-field (HAADF) contrasts, that is, bright, dark, and bi-phases. Both the light and heavy atoms have been found to be present in Y–Al–O complex-oxide nanostructures in varying quantities and forming a characteristic interface with the metallic matrix. In overcoming the limitation of conventional STEM-HAADF imaging, the integrated differential phase-contrast imaging technique was employed to investigate the oxygen atoms along with other elements in the dispersoids and its interface with the matrix. The most intriguing aspect of the study is the discovery of a few atoms thick Al2O3 interlayer (shell) around a monoclinic Y–Al–O core in the Ni-matrix. On the other hand, when the dispersoid is a hexagonal type Y–Al–O complex, the interface energy is already low, maintaining a semi-coherent interface and it was devoid of a shell.
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