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Zeitschriftenartikel zum Thema „Bimetallic nano“

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Veröffentlicht am 22. Juni 2024

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1

Crozier, P. A., und P. Claus. „Nano-characterization of Rh-Sn bimetallic catalysts“. Proceedings, annual meeting, Electron Microscopy Society of America 54 (11.08.1996): 224–25. http://dx.doi.org/10.1017/s0424820100163587.

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Bimetallic catalysts are of considerable importance because they possess both high activity and selectivity. Recently, there has been considerable interest in bimetallic catalysts produced by surface organometallic chemistry on metals. A detailed description of the structure and composition at the nanometer level is critical to fully understand the behavior of such catalysts. We have undertaken a study of the microstructure of Rh-Sn/SiO2 bimetallic hydrogenation catalysts.A Rh-Sn precursor was prepared by reacting tetrabutyltin with a silica supported Rh parent catalyst (1 %Rh/SiO2). The bimetallic catalysts were produced by thermal decomposition of the precursor in flowing hydrogen at 623 K. Five different catalysts were produced with a range of different Sn loadings from Rh(1%)/SiO2 to Rh(1%)-Sn(1.85%)/SiO2. The resulting bimetallic catalysts were able to selectively hydrogenate isolated and conjugated C=O functional groups. In situ XPS showed that the Sn and Rh were in the fully reduced state. Mossbauer spectroscopy studies confirmed that Sn was present in the zerovalent state indicating that no oxidized Sn was present. Preliminary IR data suggests that most of the Rh atoms are isolated from their neighbors (presumably by Sn).

2

Guisbiers, Grégory, Subarna Khanal, Francisco Ruiz-Zepeda, Jorge Roque de la Puente und Miguel José-Yacaman. „Cu–Ni nano-alloy: mixed, core–shell or Janus nano-particle?“ Nanoscale 6, Nr. 24 (2014): 14630–35. http://dx.doi.org/10.1039/c4nr05739b.

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Bimetallic nanoparticles like Cu–Ni are particularly attractive due to their magnetic and catalytic properties; however, their properties depend strongly on the structure of the alloy i.e. mixed, core–shell or Janus.

3

Abdelghany, A. M., A. H. Oraby, Awatif A. Hindi, Doaa M. El-Nagar und Fathia S. Alhakami. „Green synthesis of mixed metallic nanoparticles using room temperature self-assembly“. JOURNAL OF ADVANCES IN PHYSICS 13, Nr. 2 (16.03.2017): 4671–77. http://dx.doi.org/10.24297/jap.v13i2.5942.

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Bimetallic nanoparticles of silver (Ag) and gold (Au) were synthesized at room temperature using Curcumin. Reduction process of silver and gold ions with different molar ratios leads to production of different nanostructures including alloys and core-shells. Produced nanoparticles were characterized simultaneously with FTIR, UV/vis. spectroscopy, transmission electron microscopy (TEM), and Energy-dispersive X-ray (EDAX). UV/vis. optical absorption spectra of as synthesized nanoparticles reveals presence of surface palsmon resonance (SPR) of both silver at (425 nm) and gold at (540 nm) with small shift and broadness of gold band after mixing with resucing and capping agent in natural extract which suggest presence of bimetallic nano structure (Au/Ag). FTIR and EDAX data approve the presence of bimetallic nano structure combined with curcumin extract. TEM micrographs shows that silver and gold can be synthesized separately in the form of nano particles using curcumin extract. Synthesis of gold nano particles in presence of silver effectively enhance and control formation of bi-metallic structure.

4

Zhang, Tao, Li Li, Zhishuang Ye, Qingsong Yang, Yuchuan Tian und Xuhong Guo. „Preparation and characterization of Ag–Pd bimetallic nano-catalysts in thermosensitive microgel nano-reactor“. RSC Advances 8, Nr. 33 (2018): 18252–59. http://dx.doi.org/10.1039/c8ra02563k.

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5

Chen, Ming, DaMeng Wang und XiangDong Liu. „Direct synthesis of size-tailored bimetallic Ag/Au nano-spheres and nano-chains with controllable compositions by laser ablation of silver plate in HAuCl4 solution“. RSC Advances 6, Nr. 12 (2016): 9549–53. http://dx.doi.org/10.1039/c5ra24578h.

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Bimetallic Ag/Au nano-spheres and nano-chains with controllable structures fabricated by laser ablation of Ag in HAuCl₄ solution without any potential toxic surfactants or adding extra reductants.

6

Ugalde, M., E. Chavira, M. T. Ochoa-Lara, I. A. Figueroa, C. Quintanar und A. Tejeda. „Synthesis by Microwaves of Bimetallic Nano-Rhodium-Palladium“. Journal of Nanotechnology 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/578684.

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An improved acrylamide sol-gel technique using a microwave oven in order to synthesize bimetallic Rh-Pd particles is reported and discussed. The synthesis of Pd and Rh nanoparticles was carried out separately. The polymerization to form the gel of both Rh and Pd was carried out at 80°C under constant agitations. The method chosen to prepare the Rh and Pd xerogels involved the decomposition of both gels. The process begins by steadily increasing the temperature of the gel inside a microwave oven (from 80°C to 170°C). In order to eliminate the by-products generated during the sol-gel reaction, a heat treatment at a temperature of 1000°C for 2 h in inert atmosphere was carried out. After the heat treatment, the particle size increased from 50 nm to 200 nm, producing the bimetallic Rh-Pd clusters. It can be concluded that the reported microwave-assisted, sol-gel method was able to obtain nano-bimetallic Rh-Pd particles with an average size of 75 nm.

7

Kwak, Taejin, und Dongchoul Kim. „Controlling Equilibrium Morphologies of Bimetallic Nanostructures Using Thermal Dewetting via Phase-Field Modeling“. Materials 14, Nr. 21 (07.11.2021): 6697. http://dx.doi.org/10.3390/ma14216697.

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Herein, we report a computational model for the morphological evolution of bimetallic nanostructures in a thermal dewetting process, with a phase-field framework and superior optical, physical, and chemical properties compared to those of conventional nanostructures. The quantitative analysis of the simulation results revealed nano-cap, nano-ring, and nano-island equilibrium morphologies of the deposited material in thermal dewetting, and the morphologies depended on the gap between the spherical patterns on the substrate, size of the substrate, and deposition thickness. We studied the variations in the equilibrium morphologies of the nanostructures with the changes in the shape of the substrate pattern and the thickness of the deposited material. The method described herein can be used to control the properties of bimetallic nanostructures by altering their equilibrium morphologies using thermal dewetting.

8

Guczi, László. „Bimetallic nano-particles: featuring structure and reactivity“. Catalysis Today 101, Nr. 2 (30.03.2005): 53–64. http://dx.doi.org/10.1016/j.cattod.2005.01.002.

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9

Zhang, Yanlin, Chaowei Jia, Qiuyue Wang, Quan Kong, Gang Chen, Hongtao Guan und Chengjun Dong. „MOFs-Derived Porous NiFe2O4 Nano-Octahedrons with Hollow Interiors for an Excellent Toluene Gas Sensor“. Nanomaterials 9, Nr. 8 (24.07.2019): 1059. http://dx.doi.org/10.3390/nano9081059.

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Toluene is extensively used in many industrial products, which needs to be effectively detected by sensitive gas sensors even at low-ppm-level concentrations. Here, NiFe2O4 nano-octahedrons were calcinated from NiFe-bimetallic metal-organic framework (MOFs) octahedrons synthesized by a facile refluxing method. The co-existence of p-Phthalic acid (PTA) and 3,3-diaminobenzidine (DAB) promotes the formation of smooth NiFe-bimetallic MOFs octahedrons. After subsequent thermal treatment, a big weight loss (about 85%) transformed NiFe2O4 nanoparticles (30 nm) into NiFe2O4 porous nano-octahedrons with hollow interiors. The NiFe2O4 nano-octahedron based sensor exhibited excellent gas sensing properties for toluene with a nice stability, fast response, and recovery time (25 s/40 s to 100 ppm toluene), and a lower detection limitation (1 ppm) at 260 °C. The excellent toluene-sensing properties can not only be derived from the hollow interiors combined with porous nano-octahedrons to favor the diffusion of gas molecules, but also from the efficient catalytic activity of NiFe2O4 nanoparticles.

10

Radhakrishnan, Ramakrishnan, Kathiravan Kannan, Sakthivel Kumaravel und Sivakumar Thiripuranthagan. „Oxidative esterification of furfural over Au–Pd/HAP-T and Au–Ag/HAP-T bimetallic catalysts supported on mesoporous hydroxyapatite nanorods“. RSC Advances 6, Nr. 51 (2016): 45907–22. http://dx.doi.org/10.1039/c6ra07614a.

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11

Zabihi, Mohammad, Farhad Khorasheh und Jalal Shayegan. „Supported copper and cobalt oxides on activated carbon for simultaneous oxidation of toluene and cyclohexane in air“. RSC Advances 5, Nr. 7 (2015): 5107–22. http://dx.doi.org/10.1039/c4ra14430a.

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12

Hamid, Shanawar, Macharla Arun Kumar, Jong-In Han, Hyungjun Kim und Woojin Lee. „Nitrate reduction on the surface of bimetallic catalysts supported by nano-crystalline beta-zeolite (NBeta)“. Green Chemistry 19, Nr. 3 (2017): 853–66. http://dx.doi.org/10.1039/c6gc02349e.

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13

Sukhbaatar, Enkhtor, Nomin Erdene Battulga, Galbadrakh Ragchaa, Tsog Ochir Tsendsuren, Rentsenmyadag Dashzeveg, Munkhtsetseg Sambuu, Uuriintuya Dembereldorj und Erdene Ochir Ganbold. „Influence of Reaction Temperature on Yields of Multi-Walled CNTs Synthesized with Fe-Co/Al<sub>2</sub>O<sub>3</sub> Bimetallic Nanocatalyst“. Materials Science Forum 1083 (06.04.2023): 89–95. http://dx.doi.org/10.4028/p-09ls7g.

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Aluminum-supported iron and cobalt (Fe-Co/Al2O3) bimetallic nano-sized catalyst has been synthesized by the sol-gel method. The average diameter of the Fe-Co/Al2O3 catalyst was measured to be around 7 nm from SEM images. EDX measurements revealed that Fe-Co/Al2O3 consists of 59.98% of Al, 20.00% of Fe, and 20.02% of Co by atomic weight. Multi-walled carbon nanotubes (MWCNT) were prepared with as-synthesized nanocatalyst from a commercial butane gas by the CCVD method at different reaction temperatures. TEM and XRD measurements revealed that Fe-Co/Al2O3 bimetallic nano-sized catalyst is beneficial to fabricating MWCNTs by the CCVD method. The highest yield of MWCNTs was obtained at 690°C.

14

Pang, Chi, Rang Li, Ningning Dong, Ziqi Li, Jun Wang, Feng Ren und Feng Chen. „Plasmonic core–shell nano-heterostructures with temperature-dependent optical nonlinearity“. Nanoscale 12, Nr. 45 (2020): 22995–3002. http://dx.doi.org/10.1039/d0nr05176d.

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15

Nandan, Ravi, und K. K. Nanda. „A unique approach to designing resilient bi-functional nano-electrocatalysts based on ultrafine bimetallic nanoparticles dispersed in carbon nanospheres“. Journal of Materials Chemistry A 5, Nr. 21 (2017): 10544–53. http://dx.doi.org/10.1039/c7ta02293j.

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Embedded ultrafine bimetallic (PdPt) nanoparticles in hetero-atom doped carbonaceous nanospheres as an excellent nano-electrocatalyst for electro-oxidation/-reduction of alcohols/oxygen in alkaline media.

16

Khalid, Mohd, Ayaz Hassan, Ana M. B. Honorato, Frank N. Crespilho und Hamilton Varela. „Nano-flocks of a bimetallic organic framework for efficient hydrogen evolution electrocatalysis“. Chemical Communications 54, Nr. 78 (2018): 11048–51. http://dx.doi.org/10.1039/c8cc06918b.

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17

Abbas, Qasim, Sajid Hussain Siyal, Abdul Mateen, Najam Ul Hassan, Asim Idrees, Zia Ur Rehman, ElSayed M. Tag El Din, Majed A. Bajaber und Muhammad Sufyan Javed. „Hydrothermal Synthesis of Binder-Free Metallic NiCo2O4 Nano-Needles Supported on Carbon Cloth as an Advanced Electrode for Supercapacitor Applications“. Materials 15, Nr. 13 (26.06.2022): 4499. http://dx.doi.org/10.3390/ma15134499.

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It is of great significance to design electrochemical energy conversion and storage materials with excellent performance to fulfill the growing energy demand. Bimetallic cobalt/nickel-based electrode materials exhibit excellent electrical conductivity compared to mono oxides. However, their potential as electrode materials for high-performance supercapacitors (SCs) is limited because of their poor cycling stability and high-capacity fading. This work demonstrates the synthesis of binder-free bimetallic NiCo2O4 nano-needles supported on CC (NCO@CC) via a facile and scalable hydrothermal process. Excellent electrical conductivity and interconnected nanostructure of NCO@CC nano-needles provide the fast transfer of electrons with numerous channels for ion diffusion. Owing to such features, the binder-free NCO@CC electrode for SC discloses excellent specific capacitance (1476 Fg−1 at 1.5 Ag−1) with 94.25% capacitance retention even after 5000 cycles. From these outstanding electrochemical performances, it can be inferred that NCO@CC nano-needle array-structured electrodes may be potential candidates for SC applications.

18

Shi, Li-Mei, Jing-Xiong Pan, Bo Zhou und Xiaoqing Jiang. „A new bifunctional electrochemical sensor for hydrogen peroxide and nitrite based on a bimetallic metalloporphyrinic framework“. Journal of Materials Chemistry B 3, Nr. 48 (2015): 9340–48. http://dx.doi.org/10.1039/c5tb01361e.

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19

Miao, Peng, Jianwei Cao, Jie Kong, Jie Li, Teng Wang und Kai-Jie Chen. „Bimetallic MOF-derived hollow ZnNiC nano-boxes for efficient microwave absorption“. Nanoscale 12, Nr. 25 (2020): 13311–15. http://dx.doi.org/10.1039/d0nr03104f.

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20

Atmatzakis, Evangelos, Nikitas Papasimakis, Vassili Fedotov, Guillaume Vienne und Nikolay I. Zheludev. „Magneto-optical response in bimetallic metamaterials“. Nanophotonics 7, Nr. 1 (01.01.2018): 199–206. http://dx.doi.org/10.1515/nanoph-2016-0162.

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AbstractWe demonstrate resonant Faraday polarization rotation in plasmonic arrays of bimetallic nano-ring resonators consisting of Au and Ni sections. This metamaterial design allows the optimization of the trade-off between the enhancement of magneto-optical effects and plasmonic dissipation. Nickel sections corresponding to as little as ~6% of the total surface of the metamaterial result in magneto-optically induced polarization rotation equal to that of a continuous nickel film. Such bimetallic metamaterials can be used in compact magnetic sensors, active plasmonic components, and integrated photonic circuits.

21

Peng, Xin. „Antibacterial Effect of Silver-Titanium Bimetallic Nano-Materials“. Integrated Ferroelectrics 209, Nr. 1 (01.07.2020): 150–61. http://dx.doi.org/10.1080/10584587.2020.1728825.

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22

Zhang, Yu, Yalong Liao, Gongchu Shi, Wei Wang und Bowen Su. „Preparation, characterization, and catalytic performance of Pd–Ni/AC bimetallic nano-catalysts“. Green Processing and Synthesis 9, Nr. 1 (23.12.2020): 760–69. http://dx.doi.org/10.1515/gps-2020-0071.

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AbstractPalladium–nickel (Pd–Ni) bimetallic nano-catalysts supported on activated carbon (Pd–Ni/AC) have been successfully prepared by impregnation method enhanced with ultrasonic. The prepared Pd–Ni/AC catalysts were used for the catalytic hydrodechlorination reaction of bleached shellac and characterized by Fourier-transform infrared spectroscopy, nitrogen adsorption, X-ray diffraction, X-ray photoelectron spectroscopy, field-emission scanning electron microscope, and high-resolution transmission electron microscopy. The results show that Pd–Ni bimetallic structures in catalytic particles with the diameter of 4 and 14 nm were distributed uniformly on AC support, and the lattice fringe spacing in catalytic particles was measured as 0.213 nm which is lying in the region between monometallic Pd (111; 0.225 nm) and Ni (111; 0.203 nm), and that Pd1–Ni1/AC catalyst exhibits the best catalytic hydrodechlorination performance with the dechlorination efficiency of 92.58 wt% while it is used for the hydrodechlorination of bleached shellac, and the optimum catalytic performance is related to the synergistic electronic effect and bimetallic structure of the Pd1–Ni1/AC sample.

23

Liu, Fen, Yinghong Qu, Yizhi Yue, Guilong Liu und Yuan Liu. „Nano bimetallic alloy of Ni–Co obtained from LaCoxNi1−xO3 and its catalytic performance for steam reforming of ethanol“. RSC Advances 5, Nr. 22 (2015): 16837–46. http://dx.doi.org/10.1039/c4ra14131h.

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Bimetallic alloy nanoparticles of Ni–Co were obtained from reducing LaCo_xNi_1−xO₃ and this method should be extended to prepare various bimetallic or polymetallic nanoparticles.

24

Khan, Zaheer, und Abdullah Yousif Obaid. „Seedless, copper-induced synthesis of stable Ag/Cu bimetallic nanoparticles and their optical properties“. RSC Advances 6, Nr. 35 (2016): 29116–26. http://dx.doi.org/10.1039/c5ra26732c.

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In this study, we demonstrate a sensitive and selective method for the seedless synthesis of Ag@Cu bimetallic nano-structured material based on the competitive coordination chemistry of cysteine with Cu²⁺ and Ag⁺.

25

Idris, Dahir Sagir, und Arpita Roy. „Synthesis of Bimetallic Nanoparticles and Applications—An Updated Review“. Crystals 13, Nr. 4 (07.04.2023): 637. http://dx.doi.org/10.3390/cryst13040637.

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The manipulation of matter at the atomic level (nanotechnology) has experienced an explosion in research interest in recent years. Bimetallic nanoparticles are vital due to their high biocompatibility, stability and comparatively less toxicity. The synthesis methods that include physical, chemical and biological methods are explored and explained in detail, along with their advantages. They have a wide range of applications due to their synergistic properties including biological applications (in medicine and agriculture), environmental application (in water treatment and removal of toxic contaminants), engineering application (in nanosensors, nanochips and nano-semiconductors) and chemical and physical application (in optics, catalysis and paints). The green synthesis approach is a promising method of synthesis that can give rise to more biocompatible and less toxic bimetallic nanoparticles due to increasing environmental pollution. However, despite these interesting attributes of bimetallic nanoparticle, there is still much work to be done to improve the biocompatibility of bimetallic nanoparticles because of their toxicity and potentially hazardous effects.

26

Jacob, Jasmine, T. Augustine Arul Prasad, B. Scholastica Mary Vithiya, Bindhu Thomas und R. Vasanthi. „Evaluation of Cu-Ag Bimetallic Nanoalloys as Antibacterial, Antidiabetic, Anticancerous Drug Biosynthesized from Curcuma aromatica“. Asian Journal of Chemistry 34, Nr. 5 (2022): 1183–88. http://dx.doi.org/10.14233/ajchem.2022.23651.

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Drug resistant strains are formed due to unsuitable uses of antibiotics and insufficient check of infections. In present years, due to the extensive antimicrobial properties, metallic nanoparticles and metallo-pharmaceutics are highly proposed. Therefore, the synthesis of bimetallic nanoparticles are exploring towards the evolution of more productive amalgamative antimicrobials composed of combined metals. In this study, the green synthesis of Cu-Ag bimetallic nano-alloys using aqueous extract from the leaves of Curcuma aromatica is carried out. Synthesized Cu-Ag nano-alloys were characterized by UV-visible spectroscopy, scanning electron microscope (FE-SEM), transmission electron microscope (TEM-EDAX), cyclic voltammogram (CV). The characterization studies reveals that the biosynthesis produced core-shell Cu-Ag nano-alloys with spherical shape and average diameter size of 15 nm. The synthesized Cu-Ag nanoalloys exhibited antibacterial activity against both Gram-positive and Gram-negative bacteria. The antidiabetic potential of Cu-Ag nanoalloys shows an effective inhibition against α-glucosidase. Anticancerous activity of Cu-Ag nanoalloys indicates its greater efficacy in destroying cancer cells. The biosynthesis of Cu-Ag nanoalloys can be employed in medical and industrial fields on a large scale with cost reductive method.

27

Bauer, Frank, Karsten Ficht, Marko Bertmer, Wolf-Dietrich Einicke, Thomas Kuchling und Roger Gläser. „Hydroisomerization of long-chain paraffins over nano-sized bimetallic Pt–Pd/H-beta catalysts“. Catal. Sci. Technol. 4, Nr. 11 (2014): 4045–54. http://dx.doi.org/10.1039/c4cy00561a.

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The hydroisomerization of long-chain n-paraffins was studied in the temperature range of 205–230 °C at p_H2 = 50 bar over bimetallic catalysts consisting of mixtures of platinum and palladium supported on commercially available nano-sized zeolite beta.

28

Karthikeyan, Balakrishnan, und Marimuthu Murugavelu. „Sensing Uric Acid with Bimetallic Nano Ag-Pt Particles“. Key Engineering Materials 543 (März 2013): 72–75. http://dx.doi.org/10.4028/www.scientific.net/kem.543.72.

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The emergence of nanoparticles (NPs) has opened new opportunities in analytical chemistry [. These NPs exhibit different properties and functionalities when compared to monometallic particles. In particular, they show enhanced selectivity and reactivity when used as catalysts and sensors [2-. The NPs have large surface area, high surface free energy, good biocompatibility and suitability, and it has been used in constructing electrochemical biosensors [7, . The fascinating physical and chemical properties of NPs offer excellent prospects for a wide range of bio sensing applications [ . Uric acid (UA) is the principal final product of purine metabolism in the human body [1. It has been shown that extreme abnormalities of UA levels are symptoms of several diseases (e.g. gout, hyper uricaemia and LeschNyhan syndrome)[11,1.In general, electro active UA can be irreversibly oxidized in aqueous solution and the major product is allantoin [1. In continuation of our interest with the bimetal nanoparticle (BNP) sensing here in this study, we employed Ag/Pt BNPs for detecting of UA.

29

Bozeman, J. F., und H. Huang. „Structural Characteristics of Bimetallic Catalysts Supported on Nano-Ceria“. Journal of Nanomaterials 2011 (2011): 1–6. http://dx.doi.org/10.1155/2011/329757.

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Cu-Pt bimetal catalysts supported on nanocrystalline CeO2(nano-ceria) are synthesized via the low-cost sol-gel approach followed by impregnation processing. The average particle size of the catalytic composites is 63 nm. Ceria nanopowders sequentially impregnated in copper solution and then in Pt solution transformed into Pt-skin-structured Cu-Pt/ceria nanocomposite, based on the surface elemental and bulk compositional analyses. The ceria supporter has a fluorite structure, but the structure of Cu and Pt catalytic contents, not detected by X-ray diffraction spectroscopy due to the low loading level, is yet conclusive. The bimetallic catalytic nanocomposites may potentially serve as sulfur-tolerant anode in solid oxide fuel cells.

30

Faid, Alaa Y., Maidhily Manikandan, Frode Seland, Alejandro Oyarce Barnett und Svein Sunde. „Bimetallic Nano Electrocatalyst for HER in Alkaline Polymer Electrolysis“. ECS Transactions 85, Nr. 13 (19.06.2018): 961–79. http://dx.doi.org/10.1149/08513.0961ecst.

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31

Yousf, Nehad, Emtinan Ouda, Hend S. Magar, Rabeay Y. A. Hassan, S. A. Mansour und El-Shazly M. Duraia. „Synthesis, Characterization, and Electrochemical Sensing Applications of Bimetallic Oxide/Carbon Nanomaterials Hybrids“. Journal of The Electrochemical Society 169, Nr. 4 (01.04.2022): 047518. http://dx.doi.org/10.1149/1945-7111/ac6458.

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Bimetallic oxide/carbon nanomaterials hybrids were chemically synthesized and fully characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM), High-resolution transmission electron microscopy (HRTEM), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The elemental analysis confirmed the successful formation of MnCo2O4/carbon nanomaterials. The fingerprint area of FTIR showed the incorporation of the metal oxides onto CNTs and GO surfaces. Morphological investigations of the hybrids, using FESEM and HRTEM, revealed the uniform distribution of bimetallic oxides nanostructures over the surface of carbon nanomaterials. Furthermore, electrochemical characteristics were explored using the CV and EIS. The obtained electrochemical results demonstrated significant improvements in the electrocatalytic properties, in addition to the direct and fast electron transfer provided by the modified surfaces whereas the MnCo2O4/CNTs were exploited for the nano-enzymatic amperometric detection of hydrogen peroxide as an example to show the promising applications of such nanomaterials in designing high-efficiency nano-sensors and biosensors.

32

Zhang, Yuchen, Jianhui Zhang, Zongcheng Liu, Yiyi Wu, Yu Lv, Yadian Xie und Huanjiang Wang. „Alloying Iron into Palladium Nanoparticles for an Efficient Catalyst in Acetylene Dicarbonylation“. Nanomaterials 12, Nr. 21 (28.10.2022): 3803. http://dx.doi.org/10.3390/nano12213803.

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Motivated by the prominent catalytic performance and durability of nanoalloy catalysts, the Pd-based bimetallic nanoalloy catalysts were prepared using an aqueous reduction method. The Fe-Pd bimetallic nanoalloy catalyst (nano-Fe/Pd) demonstrated 98.4% yield and 99.7% selectivity for the unsaturated 1,4-dicarboxylic acid diesters. Moreover, the inductively coupled plasma (ICP) analysis shows that the Pd leaching of the catalyst can be effectively suppressed by alloying Fe atoms into the Pd crystal lattice for acetylene dicarbonylation. The detailed catalyst structure and morphology characterization demonstrate that introducing Fe into the Pd nanoparticles tunes the electronic–geometrical properties of the catalyst. Theoretical calculations indicate that the electrons of Fe transfer to Pd in the nano-Fe/Pd catalyst, enhancing activation of the C≡C bond in acetylene and weakening CO absorption capacity on catalyst surfaces. Alloying Fe into the Pd nanocatalyst effectively inhibits active metal leaching and improves catalyst activity and stability under high-pressure CO reactions.

33

Li, X., T. Hungria, C. Garcia Marcelot, M. R. Axet, P. F. Fazzini, R. P. Tan, P. Serp und K. Soulantica. „Confinement effects on the shape and composition of bimetallic nano-objects in carbon nanotubes“. Chemical Communications 52, Nr. 11 (2016): 2362–65. http://dx.doi.org/10.1039/c5cc09037g.

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34

Zhang, Yu, Yiyang Wang, Yalong Liao, Muyuan Guo und Gongchu Shi. „Preparation, characterization and dechlorination property of nano Pd-Ni/γ-Al2O3 bimetallic catalyst“. Functional Materials Letters 12, Nr. 06 (Dezember 2019): 1951003. http://dx.doi.org/10.1142/s1793604719510032.

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Nano Pd-Ni/[Formula: see text]-Al2O3 bimetallic catalyst was prepared by chemical precipitation method enhanced with ultrasonic wave. The influence of dosage of dispersant, ultrasonic intensity and mass ratio of Pd to Ni on the dechlorination property of the catalyst obtained was investigated in detail. The appearance morphology, composition and structure of the catalysts prepared were characterized with X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and nitrogen adsorption, while the specific surface area was determined using the Brunauer–Emmett–Teller (BET) isotherm and the chemical composition of active gradients was tested with inductively coupled plasma-atomic emission spectrometry (ICP-AES). Results indicate that the nano Pd-Ni/[Formula: see text]-Al2O3 bimetallic catalyst prepared has uniform distribution of active ingredients with an average particle size of 4.91[Formula: see text]nm, and the chlorine content of shellac dechlorinated with the catalyst obtained is 0.34[Formula: see text]wt.% which is lower than that reported in the literature, meaning the perfect dechlorination property of the catalyst.

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Ye, Tian-Nan, Jiang Li, Masaaki Kitano, Masato Sasase und Hideo Hosono. „Electronic interactions between a stable electride and a nano-alloy control the chemoselective reduction reaction“. Chemical Science 7, Nr. 9 (2016): 5969–75. http://dx.doi.org/10.1039/c6sc01864e.

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36

Yang, Min, Qiong Dang, Zhi Min Xie und Hai Jun Guo. „Study on CH₄ Conversion over Ce-Zr Solid Solution Supported Nano Ni-Pt Bimetallic Catalysts: Preparation and Characterization of Catalysts“. Materials Science Forum 694 (Juli 2011): 319–23. http://dx.doi.org/10.4028/www.scientific.net/msf.694.319.

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The Ni-Pt/Ce0.7Zr0.3O2 catalysts were prepared by different impregnation methods. Study the properties of samples by XRD、TEM and H2-TPR etc. The results indicated that, bimetallic catalysts have better physico-chemical performance than monometallic catalysts, the loading of Pt and impregnation sequence has some effect on Ni-Pt bimetallic catalysts.

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Saha, Arijit, Soumen Payra und Subhash Banerjee. „Synthesis of smart bimetallic nano-Cu/Ag@SiO2for clean oxidation of alcohols“. New Journal of Chemistry 41, Nr. 22 (2017): 13377–81. http://dx.doi.org/10.1039/c7nj02062g.

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Silica (SiO₂) supported bimetallic copper/silver nanoparticles (Cu/Ag@SiO₂NPs) were synthesized for clean oxidation of benzoins/benzyl alcohols. All the reactions were fast, clean and high yielding (95–99%) and the Cu/Ag@SiO₂nano-catalyst was reused eight times without loss of its catalytic performance.

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Babuji, P., Md Abu Taher, Mudasir H. Dar, D. Narayana Rao, P. Gopala Krishna und V. Saikiran. „Surface-Enhanced Raman Scattering Studies of Au-Ag Bimetallic Nanoparticles with a Tunable Surface Plasmon Resonance Wavelength Synthesized by Picosecond Laser Irradiation“. Photonics 10, Nr. 12 (06.12.2023): 1345. http://dx.doi.org/10.3390/photonics10121345.

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Here, we present a simple and green method of preparing Au-Ag bimetallic nanoparticles (NPs) with a tunable surface plasmon resonance (SPR) wavelength by using picosecond laser irradiation. Au-Ag alloy NPs have been produced by irradiating the solutions containing respective metallic salts in a polyvinyl alcohol (PVA) matrix using a picosecond laser in a single-step process. The SPR wavelength of the Au-Ag bimetallic NPs is observed to be shifted/changed with the Au-Ag concentration and the laser irradiation parameters. The Au-Ag NPs embedded in the PVA matrix are advantageous for Surface-Enhanced Raman scattering (SERS) applications. The estimated enhancement factors (EFs) were observed to vary as a function of conditions of the Au-Ag bimetallic alloy NPs synthesis and also on the concentration of Au at a fixed input fluence of irradiation. The SERS active platforms of Au-Ag bimetallic NPs showed EFs as high as of the order of 108 for Crystal Violet (CV) dye samples at nano molar concentrations. The present study demonstrates a simple, single-step, and green method that fabricates Au-Ag alloy-based nanocomposites suitable for SERS investigations with significantly higher orders of EFs.

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Proença, Manuela, Marco S. Rodrigues, Joel Borges und Filipe Vaz. „Gas Sensing with Nanoplasmonic Thin Films Composed of Nanoparticles (Au, Ag) Dispersed in a CuO Matrix“. Coatings 9, Nr. 5 (25.05.2019): 337. http://dx.doi.org/10.3390/coatings9050337.

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Magnetron sputtered nanocomposite thin films composed of monometallic Au and Ag, and bimetallic Au-Ag nanoparticles, dispersed in a CuO matrix, were prepared, characterized, and tested, which aimed to find suitable nano-plasmonic platforms capable of detecting the presence of gas molecules. The Localized Surface Plasmon Resonance phenomenon, LSPR, induced by the morphological changes of the nanoparticles (size, shape, and distribution), and promoted by the thermal annealing of the films, was used to tailor the sensitivity to the gas molecules. Results showed that the monometallic films, Au:CuO and Ag:CuO, present LSPR bands at ~719 and ~393 nm, respectively, while the bimetallic Au-Ag:CuO film has two LSPR bands, which suggests the presence of two noble metal phases. Through transmittance-LSPR measurements, the bimetallic films revealed to have the highest sensitivity to the refractive index changes, as well as high signal-to-noise ratios, respond consistently to the presence of a test gas.

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Itkulova, Sh S., und G. D. Zakumbaeva. „Olefine Production from Syngas over Bimetallic Supported“. Eurasian Chemico-Technological Journal 2, Nr. 1 (15.04.2016): 75. http://dx.doi.org/10.18321/ectj360.

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<p>Bimetallic cobalt-containing catalysts supported on alumina have been studied in the Fischer-Tropsch synthesis. It has been shown that a promotion of Co/Al<sub>2</sub>O<sub>3</sub> by iridium leads to dispergation of both metals. It was supposed that the metal dispergation occurred due to M-M interaction with formation of the bimetallic nano-particles of cluster type. These particles have the high catalytic activity, selectivity and stability in the Fischer-Tropsch synthesis. It was observed that by regulation of the process conditions it is possible to obtain the definite hydrocarbon fractions. Thus, the increase both CO+H<sub>2</sub> ratio and space velocity is accompanied by high olefin yield.</p>

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Han, Geun-Ho, Ki Yoon Kim, Hyunji Nam, Hyeonjin Kim, Jihwan Yoon, Jung-Hyun Lee, Hong-Kyu Kim et al. „Facile Direct Seed-Mediated Growth of AuPt Bimetallic Shell on the Surface of Pd Nanocubes and Application for Direct H2O2 Synthesis“. Catalysts 10, Nr. 6 (10.06.2020): 650. http://dx.doi.org/10.3390/catal10060650.

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The selective enhancement of catalytic activity is a challenging task, as catalyst modification is generally accompanied by both desirable and undesirable properties. For example, in the case of the direct synthesis of hydrogen peroxide, Pt on Pd improves hydrogen conversion, but lowers hydrogen peroxide selectivity, whereas Au on Pd enhances hydrogen peroxide selectivity but decreases hydrogen conversion. Toward an ideal catalytic property, the development of a catalyst that is capable of improving H-H dissociation for increasing H2 conversion, whilst suppressing O-O dissociation for high H2O2 selectivity would be highly beneficial. Pd-core AuPt-bimetallic shell nanoparticles with a nano-sized bimetallic layer composed of Au-rich or Pt-rich content with Pd cubes were readily prepared via the direct seed-mediated growth method. In the Pd-core AuPt-bimetallic shell nanoparticles, Au was predominantly located on the {100} facets of the Pd nanocubes, whereas Pt was deposited on the corners of the Pd nanocubes. The evaluation of Pd-core AuPt-bimetallic shell nanoparticles with varying Au and Pt contents revealed that Pd-core AuPt-bimetallic shell that was composed of 2.5 mol% Au and 5 mol% Pt, in relation to Pd, exhibited the highest H2O2 production rate (914 mmol H2O2 gmetal−1 h−1), due to the improvement of both H2O2 selectivity and H2 conversion.

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Baig, Nasir, und Rajender Varma. „Copper Modified Magnetic Bimetallic Nano-catalysts Ligand Regulated Catalytic Activity“. Current Organic Chemistry 17, Nr. 20 (01.10.2013): 2227–37. http://dx.doi.org/10.2174/13852728113179990045.

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43

Njoroge, Jean L. „Nano Focus: Stable bimetallic interfaces achieved in extreme plastic deformation“. MRS Bulletin 39, Nr. 5 (Mai 2014): 391–92. http://dx.doi.org/10.1557/mrs.2014.108.

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44

Ahmad, Mushtaq, und A. R. Abdul Aziz. „Elemental distribution and porosity enhancement in advanced nano bimetallic catalyst“. Powder Technology 280 (August 2015): 42–52. http://dx.doi.org/10.1016/j.powtec.2015.03.030.

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45

Mendoza-Pérez, Rafael, und Grégory Guisbiers. „Bimetallic Pt–Pd nano-catalyst: size, shape and composition matter“. Nanotechnology 30, Nr. 30 (03.05.2019): 305702. http://dx.doi.org/10.1088/1361-6528/ab1759.

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46

Jubair, Doaa S., Alwan M. Alwan und Walid K. Hamoudi. „Sensing Performance of Mono and Bimetallic Nano Photonics Surface Enhanced Raman Scattering (SERS) Devices“. Engineering and Technology Journal 39, Nr. 7 (25.07.2021): 1174–84. http://dx.doi.org/10.30684/etj.v39i7.1982.

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In this research, sensing performance of mono and bimetallic nanophotonics SERS sensors of gold-silver nano-columns for the detection of chlorpyrifos was investigated. For optimum substrates for Gold-silver/nano-column surface-enhanced, Raman scattering (SERS) was achieved with the silicon substrate. By combining the Ag SERS activity with the Au chemical stability and nano-columns Si large field enhancement, the Au-Ag/nano-columns Si substrate revealed perfect reproducibility, homogeneity, sensitivity in addition to chemical stability. The sensors were tested by Atomic force microscope (AFM), field emission scanning electron microscope (FESEM), energy-dispersive X-ray analysis (EDS), and X-ray diffraction (XRD). Findings presented in this research indicated modified distributions and sizes of formed alloy nanoparticles, and the hot spots junctions within the nanophotonics layer after changing the nanoparticles types. The SERS sensors performance displayed an excellent recognition of ultra-low concentrations of chlorpyrifos solutions with an exponential relationship with the Raman signal. The highest enhancement factor (Ef=1.56×106) and minimum limit of detection 0.069 mg/Kg were obtained with Au-Ag sensors.

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Wang, Feng, Yun Quan Yang und Wei Yan Wang. „Efficient Hydrogen Production by Catalytic Dehydrogenation of Methylcyclohexane over Ni-Pt/ Nano-Film Alumina Catalyst“. Advanced Materials Research 881-883 (Januar 2014): 315–23. http://dx.doi.org/10.4028/www.scientific.net/amr.881-883.315.

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The Ni-Pt bimetallic catalyst supported on nanofilm alumina was prepared by coprecipitation method under the assistance of ultrasonic vibration. The characterization result revealed that the prepared catalyst had a good dispersion with an average particle size around 7nm. The activities of supported catalyst of Ni, Pt and Ni-Pt were compared through using the dehydrogenation of methylcyclohexane (MCH) to produce toluene in Microreactor-Gas Chromatography System (MGCS). The conversion and the selectivity of the Ni-Pt catalyst at 350°C for the dehydrogenation of MCH was 97.0% and 100%, respectively. It was found that the bimetallic synergistic effect between Ni and Pt particles would affect the catalyst performance. The addition of Ni into Pt/γ-Al2O3 catalyst was beneficial to decrease the use of Pt in the dehydrogenation.

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Priya, M., und B. Muthukumaran. „Membraneless ethanol fuel cell Pt–Sn–Re nano active catalyst on a mesoporous carbon support“. RSC Advances 14, Nr. 14 (2024): 9646–55. http://dx.doi.org/10.1039/d3ra06599e.

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Addition of Re into the binary Pt–Sn catalyst increases electrical performance for ethanol oxidation reaction. Ternary based Pt–Sn–Re/MC (80 : 15 : 05) enhances the performance compared to the mono and bimetallic catalysts in the ethanol oxidation reaction in a membraneless fuel cell.

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Zhang, Huan, Ying Xue Zheng und Hai Tao Wang. „Pathway and Kinetic of Dechlorination of Trichloroethylene in Water by Supported Nanoscale Bimetallic Fe-Cu Particles“. Advanced Materials Research 213 (Februar 2011): 126–30. http://dx.doi.org/10.4028/www.scientific.net/amr.213.126.

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In this paper, exfoliated graphite supported nanoscale Fe-Cu is synthesized by aqueous-phase reductive method. The effect trichloroethene (TCE) reduction by the supported nanoscale Fe-Cu bimetal is researched in the batch experiments. Kinetics studies show that the reduction of TCE process obeys pseudo-second-order kinetics. The kinetic constants of TCE reduction by supported nano bimetal are measured at different nano Fe0 dosage and Cu content on bimetal in this study. When the dosage of supported nano Fe0 in bimetal with 4wt% Cu is 1.25g/L in reaction solution, the kSA of dechlorination reaction for TCE is higher than other nano Fe0 dosage. The dechlorination speed becomes lower as well as kSA and kobs decreasing with increasing the Fe0 dosage. Supported Fe-Cu bimetal with 4wt% Cu content exhibits the best dehalogenation effect than those with other contents of Cu. The generation of H2 and effect of Cu analysis influence the TCE dechloriation and hydrogenation in the surface of bimetal to a different extent. Excess nano Fe0 existing in the reaction system can generate plenty of H2 as well as increasing the solution pH value so that decrease the surface concentration of bimetal reactive sites and then hinder the TCE dechlorination in surface of bimetal. Cu as catalysis metal could accelerate the process of TCE dechlorination and hydrogenation.

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Wang, Tingting, Zhiyong Han und Xiaobin Lv. „Fabrication and Evaluation of Bimetallic Materials for Removal of Cr⁶⁺“. Journal of Physics: Conference Series 2160, Nr. 1 (01.01.2022): 012011. http://dx.doi.org/10.1088/1742-6596/2160/1/012011.

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Abstract Adsorption technology is an effective way for removal of heavy metals ions and other organic pollutants in water treatment. In recent years, bimetallic adsorbents with high performance and low cost have attracted more and more attention. In this study, nano zero valent iron was prepared. On this basis, Fe/Cu Bimetallic materials were prepared. The effects of Cu conversion, initial concentration, time, and pH value on Cr6+ removal rate and amount were systematically tested. The results show that under the conditions of initial concentration (50mg/L), time (60min) and pH (3), the Fe/Cu material with copper conversion of 3% has the best effect on the removal of Cr6+ in wastewater. Thus, this study is expected to provide important reference data for the effective removal of Cr6+ in water.