1
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Basagni A, Torresan V, Marzola P, Fernàndez van Raap MB, Nodari L, Amendola V. Structural evolution under physical and chemical stimuli of metastable Au-Fe nanoalloys obtained by laser ablation in liquid. Faraday Discuss 2023; 242:286-300. [PMID: 36173019 DOI: 10.1039/d2fd00087c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Metastable alloy nanoparticles are investigated for their variety of appealing properties exploitable for photonics, magnetism, catalysis and nanobiotechnology. Notably, nanophases out of thermodynamic equilibrium feature a complex "ultrastructure" leading to a dynamic evolution of composition and atomic arrangement in response to physical-chemical stimuli. In this manuscript, metastable Au-Fe alloy nanoparticles were produced by laser ablation in liquid, an emerging versatile synthetic approach for freezing multielement nanosystems in non-equilibrium conditions. The Au-Fe nanoalloys were characterized through electron microscopy, elemental analysis, X-ray diffraction and Mössbauer spectroscopy. The dynamics of the structure of the Au-Fe system was tracked at high temperature under vacuum and atmospheric conditions, evidencing the intrinsic transformative nature of the metastable nanoalloy produced by laser ablation in liquid. This dynamic structure is relevant to possible application in several fields, from photocatalysis to nanomedicine, as demonstrated through an experiment of magnetic resonance imaging in biological fluids.
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Affiliation(s)
- Andrea Basagni
- Department of Chemical Sciences, Università di Padova, Via Marzolo 1, I-35131 Padova, Italy.
| | - Veronica Torresan
- Department of Chemical Sciences, Università di Padova, Via Marzolo 1, I-35131 Padova, Italy.
| | - Pasquina Marzola
- Department of Computer Science, University of Verona, Verona 37134, Italy
| | - Marcela B Fernàndez van Raap
- Physics Institute of La Plata (IFLP-CONICET), Physics Department, Faculty of Exact Sciences, National University of La Plata, La Plata, Argentina
| | - Luca Nodari
- CNR-ICMATE Institute of Condensed Matter Chemistry and Technologies for Energy, Italian National Research Council, Corso Stati Uniti 4, 35127 Padova, Italy
| | - Vincenzo Amendola
- Department of Chemical Sciences, Università di Padova, Via Marzolo 1, I-35131 Padova, Italy.
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2
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Samardak AY, Jeon YS, Samardak VY, Kozlov AG, Rogachev KA, Ognev AV, Jeong E, Kim GW, Ko MJ, Samardak AS, Kim YK. Interwire and Intrawire Magnetostatic Interactions in Fe-Au Barcode Nanowires with Alternating Ferromagnetically Strong and Weak Segments. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2203555. [PMID: 36192153 DOI: 10.1002/smll.202203555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Revised: 09/07/2022] [Indexed: 06/16/2023]
Abstract
Metallic barcode nanowires (BNWs) composed of repeating heterogeneous segments fabricated by template-assisted electrodeposition can offer extended functionality in magnetic, electrical, mechanical, and biomedical applications. The authors consider such nanostructures as a 3D system of magnetically interacting elements with magnetic behavior strongly affected by complex magnetostatic interactions. This study discusses the influence of geometrical parameters of segments on the character of their interactions and the overall magnetic behavior of the array of BNWs having alternating magnetization, because the Fe and Au segments are made of Fe-Au alloys with high and low magnetizations. By controlling the applied current densities and the elapsed time in the electrodeposition, the dimension of the Fe-Au BNWs can be regulated. This study reveals that the influence of the length of magnetically weak Au segments on the interaction field between nanowires is different for samples with magnetically strong 100 and 200 nm long Fe segments using the first-order reversal curve (FORC) diagram method. With the help of micromagnetic simulations, three types of magnetostatic interactions in the BNW arrays are discovered and analy. This study demonstrates that the dominating type of interaction depends on the geometric parameters of the Fe and Au segments and the interwire and intrawire distances.
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Affiliation(s)
- Aleksei Yu Samardak
- Institute of High Technologies and Advanced Materials, Far Eastern Federal University, Vladivostok, 690922, Russia
| | - Yoo Sang Jeon
- Center for Hydrogen·Fuel Cell Research, Korea Institute of Science and Technology (KIST), Seoul, 02792, Republic of Korea
| | - Vadim Yu Samardak
- Institute of High Technologies and Advanced Materials, Far Eastern Federal University, Vladivostok, 690922, Russia
| | - Alexey G Kozlov
- Institute of High Technologies and Advanced Materials, Far Eastern Federal University, Vladivostok, 690922, Russia
| | - Kirill A Rogachev
- Institute of High Technologies and Advanced Materials, Far Eastern Federal University, Vladivostok, 690922, Russia
| | - Alexey V Ognev
- Institute of High Technologies and Advanced Materials, Far Eastern Federal University, Vladivostok, 690922, Russia
| | - Eunjin Jeong
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Gyu Won Kim
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Min Jun Ko
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Alexander S Samardak
- Institute of High Technologies and Advanced Materials, Far Eastern Federal University, Vladivostok, 690922, Russia
| | - Young Keun Kim
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
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3
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Rutherford BX, Dou H, Zhang B, He Z, Barnard JP, Paldi RL, Wang H. Single-Step Fabrication of Au-Fe-BaTiO 3 Nanocomposite Thin Films Embedded with Non-Equilibrium Au-Fe Alloyed Nanostructures. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:3460. [PMID: 36234589 PMCID: PMC9565752 DOI: 10.3390/nano12193460] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Revised: 09/22/2022] [Accepted: 09/27/2022] [Indexed: 06/16/2023]
Abstract
Nanocomposite thin film materials present great opportunities in coupling materials and functionalities in unique nanostructures including nanoparticles-in-matrix, vertically aligned nanocomposites (VANs), and nanolayers. Interestingly the nanocomposites processed through a non-equilibrium processing method, e.g., pulsed laser deposition (PLD), often possess unique metastable phases and microstructures that could not achieve using equilibrium techniques, and thus lead to novel physical properties. In this work, a unique three-phase system composed of BaTiO3 (BTO), with two immiscible metals, Au and Fe, is demonstrated. By adjusting the deposition laser frequency from 2 Hz to 10 Hz, the phase and morphology of Au and Fe nanoparticles in BTO matrix vary from separated Au and Fe nanoparticles to well-mixed Au-Fe alloy pillars. This is attributed to the non-equilibrium process of PLD and the limited diffusion under high laser frequency (e.g., 10 Hz). The magnetic and optical properties are effectively tuned based on the morphology variation. This work demonstrates the stabilization of non-equilibrium alloy structures in the VAN form and allows for the exploration of new non-equilibrium materials systems and their properties that could not be easily achieved through traditional equilibrium methods.
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Affiliation(s)
| | - Hongyi Dou
- School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA
| | - Bruce Zhang
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA
| | - Zihao He
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA
| | - James P. Barnard
- School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA
| | - Robynne L. Paldi
- School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA
| | - Haiyan Wang
- School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA
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4
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Qi Y, Richter G, Suadiye E, Kalina M, Rabkin E. Plastic Forming of Metals at the Nanoscale: Interdiffusion-Induced Bending of Bimetallic Nanowhiskers. ACS NANO 2020; 14:11691-11699. [PMID: 32790344 PMCID: PMC7586402 DOI: 10.1021/acsnano.0c04327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2020] [Accepted: 08/10/2020] [Indexed: 06/11/2023]
Abstract
Controlled plastic forming of nanoscale metallic objects by applying mechanical load is a challenge, since defect-free nanocrystals usually yield at near theoretical shear strength, followed by stochastic dislocation avalanches that lead to catastrophic failure or irregular, uncontrolled shapes. Herein, instead of mechanical load, we utilize chemical stress from imbalanced interdiffusion to manipulate the shape of nanowhiskers. Bimetallic Au-Fe nanowhiskers with an ultrahigh bending strength were synthesized employing the molecular beam epitaxy technique. The one-sided Fe coating on the defect-free, single-crystalline Au nanowhisker exhibited both single- and polycrystalline regions. Annealing the bimetallic nanowhiskers at elevated temperatures led to gradual change of curvature and irreversible bending. At low homological temperatures at which grain boundary diffusion is a dominant mode of mass transport this irreversible bending was attributed to the grain boundary Kirkendall effect during the diffusion of Au along the grain boundaries in the Fe layer. At higher temperatures and longer annealing times, the bending was dominated by intensive bulk diffusion of Fe into the Au nanowhisker, accompanied by a significant migration of the Au-Fe interphase boundary toward the Fe layers. The irreversible bending was caused by the concentration dependence of the lattice parameter of the Au(Fe) alloy and by the volume effect associated with the interphase boundary migration. The results of this study demonstrate a high potential of chemical interdiffusion in the controlled plastic forming of ultrastrong metal nanostructures. By design of the thickness, microstructure, and composition of the coating as well as the parameters of heat treatment, bimetallic nanowhiskers can be bent in a controlled manner.
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Affiliation(s)
- Yuanshen Qi
- Department
of Materials Science and Engineering, Technion−Israel
Institute of Technology, 3200003 Haifa, Israel
| | - Gunther Richter
- Max
Planck Institute for Intelligent Systems, Heisenbergstrasse 3, 70569 Stuttgart, Germany
| | - Eylül Suadiye
- Max
Planck Institute for Intelligent Systems, Heisenbergstrasse 3, 70569 Stuttgart, Germany
| | - Michael Kalina
- Department
of Materials Science and Engineering, Technion−Israel
Institute of Technology, 3200003 Haifa, Israel
| | - Eugen Rabkin
- Department
of Materials Science and Engineering, Technion−Israel
Institute of Technology, 3200003 Haifa, Israel
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5
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Combettes S, Lam J, Benzo P, Ponchet A, Casanove MJ, Calvo F, Benoit M. How interface properties control the equilibrium shape of core-shell Fe-Au and Fe-Ag nanoparticles. NANOSCALE 2020; 12:18079-18090. [PMID: 32856658 DOI: 10.1039/d0nr04425c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
While combining two metals in the same nanoparticle can lead to remarkable novel applications, the resulting structure in terms of crystallinity and shape remains difficult to predict. It is thus essential to provide a detailed atomistic picture of the underlying growth processes. In the present work we address the case of core-shell Fe-Au and Fe-Ag nanoparticles. Interface properties between Fe and the noble metals Au and Ag, computed using DFT, were used to parameterize Fe-Au and Fe-Ag pairwise interactions in combination with available many-body potentials for the pure elements. The growth of Au or Ag shells on nanometric Fe cores with prescribed shapes was then modelled by means of Monte Carlo simulations. The shape of the obtained Fe-Au nanoparticles is found to strongly evolve with the amount of metal deposited on the Fe core, a transition from the polyhedral Wulff shape of bare iron to a cubic shape taking place as the amount of deposited gold exceeds two monolayers. In striking contrast, the growth of silver proceeds in a much more anisotropic, Janus-like way and with a lesser dependence on the iron core shape. In both cases, the predicted morphologies are found to be in good agreement with experimental observations in which the nanoparticles are grown by physical deposition methods. Understanding the origin of these differences, which can be traced back to subtle variations in the electronic structure of the Au/Fe and Ag/Fe interfaces, should further contribute to the better design of core-shell bimetallic nanoparticles.
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Affiliation(s)
- Ségolène Combettes
- CEMES, CNRS and Université de Toulouse, 29 rue Jeanne Marvig, 31055 Toulouse, France.
| | - Julien Lam
- Center for Nonlinear Phenomena and Complex Systems, Université Libre de Bruxelles, Code Postal 231, Boulevard du Triomphe, 1050 Brussels, Belgium
| | - Patrizio Benzo
- CEMES, CNRS and Université de Toulouse, 29 rue Jeanne Marvig, 31055 Toulouse, France.
| | - Anne Ponchet
- CEMES, CNRS and Université de Toulouse, 29 rue Jeanne Marvig, 31055 Toulouse, France.
| | - Marie-José Casanove
- CEMES, CNRS and Université de Toulouse, 29 rue Jeanne Marvig, 31055 Toulouse, France.
| | - Florent Calvo
- Univ. Grenoble Alpes, CNRS, LiPhy, 38000 Grenoble, France
| | - Magali Benoit
- CEMES, CNRS and Université de Toulouse, 29 rue Jeanne Marvig, 31055 Toulouse, France.
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6
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Schnedlitz M, Knez D, Lasserus M, Hofer F, Fernández-Perea R, Hauser AW, Pilar de Lara-Castells M, Ernst WE. Thermally Induced Diffusion and Restructuring of Iron Triade (Fe, Co, Ni) Nanoparticles Passivated by Several Layers of Gold. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2020; 124:16680-16688. [PMID: 32765801 PMCID: PMC7397372 DOI: 10.1021/acs.jpcc.0c04561] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Revised: 07/09/2020] [Indexed: 05/21/2023]
Abstract
The temperature-induced structural changes of Fe-, Co-, and Ni-Au core-shell nanoparticles with diameters around 5 nm are studied via atomically resolved transmission electron microscopy. We observe structural transitions from local toward global energy minima induced by elevated temperatures. The experimental observations are accompanied by a computational modeling of all core-shell particles with either centralized or decentralized core positions. The embedded atom model is employed and further supported by density functional theory calculations. We provide a detailed comparison of vacancy formation energies obtained for all materials involved in order to explain the variations in the restructuring processes which we observe in temperature-programmed TEM studies of the particles.
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Affiliation(s)
- Martin Schnedlitz
- Institute
of Experimental Physics, Graz University
of Technology, Petersgasse 16, A-8010 Graz, Austria
| | - Daniel Knez
- Institute
for Electron Microscopy and Nanoanalysis & Graz Centre for Electron
Microscopy, Graz University of Technology, Steyrergasse 17, A-8010 Graz, Austria
| | - Maximilian Lasserus
- Institute
of Experimental Physics, Graz University
of Technology, Petersgasse 16, A-8010 Graz, Austria
| | - Ferdinand Hofer
- Institute
for Electron Microscopy and Nanoanalysis & Graz Centre for Electron
Microscopy, Graz University of Technology, Steyrergasse 17, A-8010 Graz, Austria
| | | | - Andreas W. Hauser
- Institute
of Experimental Physics, Graz University
of Technology, Petersgasse 16, A-8010 Graz, Austria
| | | | - Wolfgang E. Ernst
- Institute
of Experimental Physics, Graz University
of Technology, Petersgasse 16, A-8010 Graz, Austria
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7
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Alexander DTL, Forrer D, Rossi E, Lidorikis E, Agnoli S, Bernasconi GD, Butet J, Martin OJF, Amendola V. Electronic Structure-Dependent Surface Plasmon Resonance in Single Au-Fe Nanoalloys. NANO LETTERS 2019; 19:5754-5761. [PMID: 31348861 DOI: 10.1021/acs.nanolett.9b02396] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
The relationship between composition and plasmonic properties in noble metal nanoalloys is still largely unexplored. Yet, nanoalloys of noble metals, such as gold, with transition elements, such as iron, have unique properties and a number of potential applications, ranging from nanomedicine to magneto-plasmonics and plasmon-enhanced catalysis. Here, we investigate the localized surface plasmon resonance at the level of the single Au-Fe nanoparticle by applying a strategy that combines experimental measurements using near field electron energy loss spectroscopy with theoretical studies via a full wave numerical analysis and density functional theory calculations of electronic structure. We show that, as the iron fraction increases, the plasmon resonance is blue-shifted and significantly damped, as a consequence of the changes in the electronic band structure of the alloy. This allows the identification of three relevant phenomena to be considered in the design and realization of any plasmonic nanoalloy, specifically: the appearance of new states around the Fermi level; the change in the free electron density of the metal; and the blue shift of interband transitions. Overall, this study provides new opportunities for the control of the optical response in Au-Fe and other plasmonic nanoalloys, which are useful for the realization of magneto-plasmonic devices for molecular sensing, thermo-plasmonics, bioimaging, photocatalysis, and the amplification of spectroscopic signals by local field enhancement.
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Affiliation(s)
- Duncan T L Alexander
- Electron Spectrometry and Microscopy Laboratory (LSME), Institute of Physics (IPHYS) , Ecole Polytechnique Fédérale de Lausanne (EPFL) , 1015 Lausanne , Switzerland
- Interdisciplinary Centre for Electron Microscopy (CIME) , Ecole Polytechnique Fédérale de Lausanne (EPFL) , 1015 Lausanne , Switzerland
| | - Daniel Forrer
- CNR-ICMATE , 35127 Padova , Italy
- Department of Chemical Sciences , University of Padova , 35131 Padova , Italy
| | - Enrico Rossi
- Department of Chemical Sciences , University of Padova , 35131 Padova , Italy
| | - Elefterios Lidorikis
- Department Materials Science and Engineering , University of Ioannina , 45110 Ioannina , Greece
| | - Stefano Agnoli
- Department of Chemical Sciences , University of Padova , 35131 Padova , Italy
| | - Gabriel D Bernasconi
- Nanophotonics and Metrology Laboratory (NAM) , Ecole Polytechnique Fédérale de Lausanne (EPFL) , 1015 Lausanne , Switzerland
| | - Jérémy Butet
- Nanophotonics and Metrology Laboratory (NAM) , Ecole Polytechnique Fédérale de Lausanne (EPFL) , 1015 Lausanne , Switzerland
| | - Olivier J F Martin
- Nanophotonics and Metrology Laboratory (NAM) , Ecole Polytechnique Fédérale de Lausanne (EPFL) , 1015 Lausanne , Switzerland
| | - Vincenzo Amendola
- Department of Chemical Sciences , University of Padova , 35131 Padova , Italy
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8
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A universal approach for the synthesis of two-dimensional binary compounds. Nat Commun 2019; 10:2957. [PMID: 31273207 PMCID: PMC6609655 DOI: 10.1038/s41467-019-11075-2] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Accepted: 06/20/2019] [Indexed: 02/07/2023] Open
Abstract
Only a few of the vast range of potential two-dimensional materials (2D) have been isolated or synthesised to date. Typically, 2D materials are discovered by mechanically exfoliating naturally occurring bulk crystals to produce atomically thin layers, after which a material-specific vapour synthesis method must be developed to grow interesting candidates in a scalable manner. Here we show a general approach for synthesising thin layers of two-dimensional binary compounds. We apply the method to obtain high quality, epitaxial MoS2 films, and extend the principle to the synthesis of a wide range of other materials—both well-known and never-before isolated—including transition metal sulphides, selenides, tellurides, and nitrides. This approach greatly simplifies the synthesis of currently known materials, and provides a general framework for synthesising both predicted and unexpected new 2D compounds. The scalable synthesis of 2D materials critically relies on finding appropriate vapour-phase metal precursors and careful fine-tuning of growth parameters. Here, the authors instead use solid elemental precursors and a single recipe to demonstrate a general approach for synthesising thin epitaxial layers of 20 different 2D binary compounds, including transition metal sulphides, selenides, tellurides, and nitrides.
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9
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Amram D, Schuh CA. Higher Temperatures Yield Smaller Grains in a Thermally Stable Phase-Transforming Nanocrystalline Alloy. PHYSICAL REVIEW LETTERS 2018; 121:145503. [PMID: 30339419 DOI: 10.1103/physrevlett.121.145503] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Indexed: 06/08/2023]
Abstract
Grains in crystalline materials usually grow with increased thermal exposure. Classical phenomena such as recrystallization may lead to a purely temporary decrease in the grain size, while recent advances in alloy design can yield thermally stable nanocrystalline materials in which grain growth stagnates. But grains never shrink, since there is a lack of interface-generating mechanisms at high temperatures, which are required to decrease the grain size if such was the system's thermodynamic tendency. Here we sidestep this paradigm by designing a nanocrystalline alloy having an allotropic phase transformation-an interface-generating mechanism-such that only the high-temperature phase is stabilized against grain growth. We demonstrate that for an Fe-Au alloy cycled through the α↔γ transformation, the high-temperature phase (γ-Fe) has a stable fine grain size, smaller than its low-temperature counterpart (α-Fe). The result is an unusual material in which an increase in temperature leads to finer grains that are stable in size.
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Affiliation(s)
- Dor Amram
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
| | - Christopher A Schuh
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
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10
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Recovery of Gold and Iron from Cyanide Tailings with a Combined Direct Reduction Roasting and Leaching Process. METALS 2018. [DOI: 10.3390/met8070561] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Cyanide tailings are the hazardous waste discharged after gold cyanidation leaching. The recovery of gold and iron from cyanide tailings was investigated with a combined direct reduction roasting and leaching process. The effects of reduction temperature, coal dosage and CaO dosage on gold enrichment into Au-Fe alloy (FexAu1−x) were studied in direct reduction roasting. Gold containing iron powders, i.e., Au-Fe alloy, had the gold grade of 8.23 g/t with a recovery of 97.46%. After separating gold and iron in iron powders with sulfuric acid leaching, ferrous sulfate in the leachate was crystallized to prepare FeSO4·7H2O with a yield of 222.42% to cyanide tailings. Gold enriched in acid-leaching residue with gold grade of 216.58 g/t was extracted into pregnant solution. The total gold recovery of the whole process reached as high as 94.23%. The tailings generated in the magnetic separation of roasted products, with a yield of 51.33% to cyanide tailings, had no toxic cyanide any more. The gold enrichment behaviors indicated that higher reduction temperature and larger dosage of coal and CaO could promote the allocation of more gold in iron phase rather than in slag phase. The mechanism for enriching gold from cyanide tailings into iron phase was proposed. This work provided a novel route to simultaneously recover gold and iron from cyanide tailings.
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11
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Versteylen CD, Sluiter MHF, van Dijk NH. Modelling the formation and self-healing of creep damage in iron-based alloys. JOURNAL OF MATERIALS SCIENCE 2018; 53:14758-14773. [PMID: 30956350 PMCID: PMC6428279 DOI: 10.1007/s10853-018-2666-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/21/2018] [Accepted: 07/04/2018] [Indexed: 06/09/2023]
Abstract
A self-consistent model is applied to predict the creep cavity growth and strain rates in metals from the perspective of self-healing. In this model, the creep cavity growth rate is intricately linked to the strain rate. The self-healing process causes precipitates to grow inside creep cavities. Due to the Kirkendall effect, a diffusional flux of vacancies is induced in the direction away from the creep cavity during this selective self-healing precipitation. This process impedes the creep cavity growth. The critical stress for self-healing can be derived, and an analysis is made of the efficiency of self-healing elements in binary Fe-Cu, Fe-Au, Fe-Mo, and Fe-W alloys. Fe-Au is found to be the most efficient self-healing alloy. Fe-Mo and Fe-W alloys provide good alternatives that have the potential to be employed at high temperatures.
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Affiliation(s)
- C. D. Versteylen
- Fundamental Aspects of Materials and Energy, Faculty of Applied Sciences, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands
- Virtual Materials and Mechanics, Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands
| | - M. H. F. Sluiter
- Virtual Materials and Mechanics, Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands
| | - N. H. van Dijk
- Fundamental Aspects of Materials and Energy, Faculty of Applied Sciences, Delft University of Technology, Mekelweg 15, 2629 JB Delft, The Netherlands
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12
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Martirez JMP, Carter EA. Prediction of a low-temperature N 2 dissociation catalyst exploiting near-IR-to-visible light nanoplasmonics. SCIENCE ADVANCES 2017; 3:eaao4710. [PMID: 29291247 PMCID: PMC5744471 DOI: 10.1126/sciadv.aao4710] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Accepted: 11/20/2017] [Indexed: 05/27/2023]
Abstract
Despite more than a century of advances in catalyst and production plant design, the Haber-Bosch process for industrial ammonia (NH3) synthesis still requires energy-intensive high temperatures and pressures. We propose taking advantage of sunlight conversion into surface plasmon resonances in Au nanoparticles to enhance the rate of the N2 dissociation reaction, which is the bottleneck in NH3 production. We predict that this can be achieved through Mo doping of the Au surface based on embedded multireference correlated wave function calculations. The Au component serves as a light-harvesting antenna funneling energy onto the Mo active site, whereby excited-state channels (requiring 1.4 to 1.45 eV, near-infrared-to-visible plasmon resonances) may be accessed. This effectively lowers the energy barriers to 0.44 to 0.77 eV/N2 (43 to 74 kJ/mol N2) from 3.5 eV/N2 (335 kJ/mol N2) in the ground state. The overall process requires three successive surface excitation events, which could be facilitated by amplified resonance energy transfer due to plasmon local field enhancement.
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Affiliation(s)
- John Mark P. Martirez
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544–5263, USA
| | - Emily A. Carter
- School of Engineering and Applied Science, Princeton University, Princeton, NJ 08544–5263, USA
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13
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Synthesis of various 3D porous gold-based alloy nanostructures with branched shapes. J Colloid Interface Sci 2016; 483:281-286. [DOI: 10.1016/j.jcis.2016.08.051] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Revised: 08/02/2016] [Accepted: 08/19/2016] [Indexed: 01/24/2023]
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14
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Sousa F, Sanavio B, Saccani A, Tang Y, Zucca I, Carney TM, Mastropietro A, Jacob Silva PH, Carney RP, Schenk K, Omrani AO, Huang P, Yang L, Rønnow HM, Stellacci F, Krol S. Superparamagnetic Nanoparticles as High Efficiency Magnetic Resonance Imaging T2 Contrast Agent. Bioconjug Chem 2016; 28:161-170. [DOI: 10.1021/acs.bioconjchem.6b00577] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Fernanda Sousa
- Nanomedicine
Laboratory, Fondazione IRCCS Istituto Neurologico Carlo Besta, AMADEOLAB, Via G.A. Amadeo 42, 20133 Milan, Italy
- IFOM The FIRC Institute of Molecular Oncology, Via Adamello 16, 20139 Milan, Italy
| | - Barbara Sanavio
- Nanomedicine
Laboratory, Fondazione IRCCS Istituto Neurologico Carlo Besta, AMADEOLAB, Via G.A. Amadeo 42, 20133 Milan, Italy
| | - Alessandra Saccani
- Nanomedicine
Laboratory, Fondazione IRCCS Istituto Neurologico Carlo Besta, AMADEOLAB, Via G.A. Amadeo 42, 20133 Milan, Italy
| | - Yun Tang
- Institute
of Materials, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland
- Department
of Chemistry, Laboratory of Advanced Materials, Fudan University, Shanghai 200433, China
| | - Ileana Zucca
- Laboratory
of Experimental Imaging, Fondazione IRCCS Istituto Neurologico Carlo Besta, Via Celoria 11, 20133 Milan, Italy
| | - Tamara M. Carney
- Institute
of Materials, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland
| | - Alfonso Mastropietro
- Laboratory
of Experimental Imaging, Fondazione IRCCS Istituto Neurologico Carlo Besta, Via Celoria 11, 20133 Milan, Italy
| | - Paulo H. Jacob Silva
- Institute
of Materials, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland
| | - Randy P. Carney
- Institute
of Materials, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland
| | - Kurt Schenk
- Laboratory
of X-ray Diffraction, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, CH-1015, Switzerland
| | - Arash O. Omrani
- Laboratory
for Quantum Magnetism, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, CH-1015, Switzerland
| | - Ping Huang
- Laboratory
for Quantum Magnetism, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, CH-1015, Switzerland
| | - Lin Yang
- Laboratory
for Quantum Magnetism, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, CH-1015, Switzerland
| | - Henrik M. Rønnow
- Laboratory
for Quantum Magnetism, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, CH-1015, Switzerland
| | - Francesco Stellacci
- Institute
of Materials, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland
| | - Silke Krol
- Nanomedicine
Laboratory, Fondazione IRCCS Istituto Neurologico Carlo Besta, AMADEOLAB, Via G.A. Amadeo 42, 20133 Milan, Italy
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15
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Liang X, Zhu Y, Peng B, Deng L, Xie J, Lu H, Wu M, Bi L. Influence of Interface Structure on Magnetic Proximity Effect in Pt/Y3Fe5O12 Heterostructures. ACS APPLIED MATERIALS & INTERFACES 2016; 8:8175-8183. [PMID: 26967756 DOI: 10.1021/acsami.5b11173] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The influence of interface structure on the magnetic proximity effect (MPE) in Pt/Y3Fe5O12 (YIG) bilayered heterostructures is studied by first-principles calculations based on the density functional theory (DFT). When Pt atoms are in close proximity with Y or Fe ions at the interface, Pt-Y and Pt-Fe bonds are observed. The crystalline orientations and interface termination layers of the YIG strongly modify both the strength and the length of the Pt-Fe bonding and thereby influence the magnetic properties of the Pt. Point defects including tetrahedral Fe, octahedral Fe, and Y vacancies are introduced at the Pt/YIG interface to quantitatively evaluate the influence on the MPE from individual atoms. For the Pt(100)/YIG(100) structure, the interface tetrahedral Fe vacancies can significantly reduce or even completely diminish the magnetic moments in the Pt. In a stark contrast, the octahedral Fe vacancies slightly enhance the Pt magnetism, and the nonmagnetic Y vacancies cause little influences to the Pt magnetism. These results indicate that the strength of the MPE at the Pt/YIG interface strongly depends on the interface structure. This dependence originated from the direct exchange interaction between the Fe 3d and Pt 5d electrons via electronic state hybridization as well as the electron exchange coupling between the Pt atoms.
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Affiliation(s)
- Xiao Liang
- National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China , Chengdu 610054, People's Republic of China
- State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China , Chengdu 610054, China
- Key Laboratory of Multi-spectral Absorbing Materials and Structures, University of Electronic Science and Technology of China, Ministry of Education , Chengdu 610054, People's Republic of China
| | - Yupeng Zhu
- National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China , Chengdu 610054, People's Republic of China
- State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China , Chengdu 610054, China
- Key Laboratory of Multi-spectral Absorbing Materials and Structures, University of Electronic Science and Technology of China, Ministry of Education , Chengdu 610054, People's Republic of China
| | - Bo Peng
- National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China , Chengdu 610054, People's Republic of China
- State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China , Chengdu 610054, China
- Key Laboratory of Multi-spectral Absorbing Materials and Structures, University of Electronic Science and Technology of China, Ministry of Education , Chengdu 610054, People's Republic of China
| | - Longjiang Deng
- National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China , Chengdu 610054, People's Republic of China
- State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China , Chengdu 610054, China
- Key Laboratory of Multi-spectral Absorbing Materials and Structures, University of Electronic Science and Technology of China, Ministry of Education , Chengdu 610054, People's Republic of China
| | - Jianliang Xie
- National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China , Chengdu 610054, People's Republic of China
- State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China , Chengdu 610054, China
- Key Laboratory of Multi-spectral Absorbing Materials and Structures, University of Electronic Science and Technology of China, Ministry of Education , Chengdu 610054, People's Republic of China
| | - Haipeng Lu
- National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China , Chengdu 610054, People's Republic of China
- State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China , Chengdu 610054, China
- Key Laboratory of Multi-spectral Absorbing Materials and Structures, University of Electronic Science and Technology of China, Ministry of Education , Chengdu 610054, People's Republic of China
| | - Mingzhong Wu
- Physics Department, Colorado State University , Fort Collins, Colorado 80523, United States
| | - Lei Bi
- National Engineering Research Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China , Chengdu 610054, People's Republic of China
- State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China , Chengdu 610054, China
- Key Laboratory of Multi-spectral Absorbing Materials and Structures, University of Electronic Science and Technology of China, Ministry of Education , Chengdu 610054, People's Republic of China
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16
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Martirez JMP, Carter EA. Thermodynamic Constraints in Using AuM (M = Fe, Co, Ni, and Mo) Alloys as N₂ Dissociation Catalysts: Functionalizing a Plasmon-Active Metal. ACS NANO 2016; 10:2940-2949. [PMID: 26831377 DOI: 10.1021/acsnano.6b00085] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The Haber-Bosch process for NH3 synthesis is arguably one of the greatest inventions of the 20th century, with a massive footprint in agriculture and, historically, warfare. Current catalysts for this reaction use Fe for N2 activation, conducted at high temperatures and pressures to improve conversion rate and efficiency. A recent finding shows that plasmonic metal nanoparticles can either generate highly reactive electrons and holes or induce resonant surface excitations through plasmonic decay, which catalyze dissociation and redox reactions under mild conditions. It is therefore appealing to consider AuM (M = Fe, Co, Ni, and Mo) alloys to combine the strongly plasmonic nature of Au and the catalytic nature of M metals toward N2 dissociation, which together might facilitate ammonia production. To this end, through density functional theory, we (i) explore the feasibility of forming these surface alloys, (ii) find a pathway that may stabilize/deactivate surface M substituents during fabrication, and (iii) define a complementary route to reactivate them under operational conditions. Finally, we evaluate their reactivity toward N2, as well as their ability to support a pathway for N2 dissociation with a low thermodynamic barrier. We find that AuFe possesses similar appealing qualities, including relative stability with respect to phase separation, reversibility of Fe oxidation and reduction, and reactivity toward N2. While AuMo achieves the best affinity toward N2, its strong propensity toward oxidation could greatly limit its use.
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Affiliation(s)
- John Mark P Martirez
- Department of Mechanical and Aerospace Engineering and ‡Program in Applied and Computational Mathematics, and the Andlinger Center for Energy and the Environment, Princeton University , Princeton, New Jersey 08544, United States
| | - Emily A Carter
- Department of Mechanical and Aerospace Engineering and ‡Program in Applied and Computational Mathematics, and the Andlinger Center for Energy and the Environment, Princeton University , Princeton, New Jersey 08544, United States
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17
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Langlois C, Benzo P, Arenal R, Benoit M, Nicolai J, Combe N, Ponchet A, Casanove MJ. Fully Crystalline Faceted Fe-Au Core-Shell Nanoparticles. NANO LETTERS 2015; 15:5075-5080. [PMID: 26146846 DOI: 10.1021/acs.nanolett.5b02273] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Fe-Au core-shell nanoparticles displaying an original polyhedral morphology have been successfully synthesized through a physical route. Analyses using transmission electron microscopy show that the Au shell forms truncated pyramids epitaxially grown on the (100) facets of the iron cubic core. The evolution of the elastic energy and strain field in the nanoparticles as a function of their geometry and composition is calculated using the finite-element method. The stability of the remarkable centered core-shell morphology experimentally observed is attributed to the weak elastic energy resulting from the low misfit at the Fe/Au (100) interface compared to the surface energy contribution.
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Affiliation(s)
- C Langlois
- †CEMES, CNRS UPR 8011 and Université de Toulouse, 29 rue Jeanne Marvig, F-31055 Toulouse, France
| | - P Benzo
- †CEMES, CNRS UPR 8011 and Université de Toulouse, 29 rue Jeanne Marvig, F-31055 Toulouse, France
| | - R Arenal
- ‡L.M.A., Instituto de Nanociencia de Aragon, Universidad de Zaragoza, C/Mariano Esquillor s/n, 50018 Zaragoza, Spain
- §Fundacion ARAID, 50018 Zaragoza, Spain
| | - M Benoit
- †CEMES, CNRS UPR 8011 and Université de Toulouse, 29 rue Jeanne Marvig, F-31055 Toulouse, France
| | - J Nicolai
- †CEMES, CNRS UPR 8011 and Université de Toulouse, 29 rue Jeanne Marvig, F-31055 Toulouse, France
| | - N Combe
- †CEMES, CNRS UPR 8011 and Université de Toulouse, 29 rue Jeanne Marvig, F-31055 Toulouse, France
| | - A Ponchet
- †CEMES, CNRS UPR 8011 and Université de Toulouse, 29 rue Jeanne Marvig, F-31055 Toulouse, France
| | - M J Casanove
- †CEMES, CNRS UPR 8011 and Université de Toulouse, 29 rue Jeanne Marvig, F-31055 Toulouse, France
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18
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Amram D, Rabkin E. Core(Fe)-shell(Au) nanoparticles obtained from thin Fe/Au bilayers employing surface segregation. ACS NANO 2014; 8:10687-93. [PMID: 25211205 DOI: 10.1021/nn504284d] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Core(Fe)-shell(Au) nanoparticles are obtained by solid-state dewetting of thin Fe/Au bilayer films deposited on a sapphire substrate. The core-shell morphology is achieved by employing the equilibrium segregation phenomenon, where Au atoms form a homogeneous thin shell on the surfaces of an Fe nanoparticle and at its interface with the substrate, reducing the total interfacial energy of the system. The obtained nanoparticles are single crystalline (structurally perfect), thermally stable, and of high purity. Their size may be tuned by changing the initial film thickness. We demonstrate that the nanoparticles can subsequently be stripped from the substrate, and/or be modified by attaching thiol-containing organic molecules for use in various nanotechnology-related applications. The method presented herein may easily be extended to other metal combinations, especially those relevant for catalysis, thus helping to reduce precious-metal (e.g., Au, Pt, Rh) content in the catalyst.
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Affiliation(s)
- Dor Amram
- Department of Materials Science and Engineering, Technion-Israel Institute of Technology , Haifa 32000, Israel
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19
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Mishra S, Song K, Ghosh KC, Nath M. Enhancement of superconducting Tc (33 K) by entrapment of FeSe in carbon coated Au-Pd17Se15 nanoparticles. ACS NANO 2014; 8:2077-2086. [PMID: 24494773 DOI: 10.1021/nn404262v] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
FeSe has been an interesting member of the Fe-based superconductor family ever since the discovery of superconductivity in this simple binary chalcogenide. Simplicity of composition and ease of synthesis has made FeSe, in particular, very lucrative as a test system to understand the unconventional nature of superconductivity, especially in low-dimensional models. In this article we report the synthesis of composite nanoparticles containing FeSe nanoislands entrapped within an ent-FeSe-Pd16Se15-Au nanoparticle and sharing an interface with Pd17Se15. This assembly exhibits a significant enhancement in the superconducting Tc (onset at 33 K) accompanied by a noticeable lattice compression of FeSe along the <001> and <101> directions. The Tc in FeSe is very sensitive to application of pressure and it has been shown that with increasing external pressure Tc can be increased almost 4-fold. In these composite nanoparticles reported here, immobilization of FeSe on the Pd17Se15 surface contributes to increasing the effect of interfacial pressure, thereby enhancing the Tc. The effect of interfacial pressure is also manifested in the contraction of the FeSe lattice (up to 3.8% in <001> direction) as observed through extensive high-resolution TEM imaging. The confined FeSe in these nanoparticles occupied a region of approximately 15-25 nm, where lattice compression was uniform over the entire FeSe region, thereby maximizing its effect in enhancing the Tc. The nanoparticles have been synthesized by a simple catalyst-aided vapor transport reaction at 800 °C where iron acetylacetonate and Se were used as precursors. Morphology and composition of these nanoparticles have been studied in details through extensive electron microscopy.
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Affiliation(s)
- Sukhada Mishra
- Department of Chemistry, Missouri University of Science and Technology , Rolla, Missouri 65409, United States
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20
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Mishra S, Song K, Koza JA, Nath M. Synthesis of superconducting nanocables of FeSe encapsulated in carbonaceous shell. ACS NANO 2013; 7:1145-1154. [PMID: 23363299 DOI: 10.1021/nn3056669] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The recent discovery of superconductivity in iron selenide has attracted considerable attention due to the simplicity of composition, unconventional nature of superconductivity, and ease of synthesis. We have synthesized superconducting FeSe nanowires with a simple catalyst-aided vapor transport reaction at 800 °C in an inert atmosphere. The precursors were chosen to be elemental Se and iron acetylacetonate [Fe(III)(C₅H₈O₂)₃]. These vaporized very easily, thereby facilitating transport, and also contributed to the formation of a carbonaceous shell encapsulating the FeSe nanowires. The superconductivity of these nanocables was confirmed through magnetic measurements and a T(c) of ≈8 K was obtained for an ensemble of nanocables. The length of FeSe filling inside the carbon nanofibers could be varied by controlling the reaction conditions while the diameter of nanowires was dependent on the thickness of Au-Pd coating used as a catalyst. Extensive analysis through high-resolution microscopy revealed that there was considerable lattice contraction of FeSe in the nanocable up to about 3.6% along the c-direction leading to a reduced spacing between the (001) lattice planes. Interestingly, this compression was more pronounced near the catalyst-FeSe interface and was reduced further along the length of the nanocable. The presence of carbon nanofibers as a shell around the FeSe protected the FeSe nanowires from both atmospheric O₂ and moisture attack, as was evident from the very long ambient condition shelf life of these nanocables, and also makes them more stable under e-beam irradiation.
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Affiliation(s)
- Sukhada Mishra
- Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, USA
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21
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Rakers LD, Beck PA. Magnetism in Au82.5Fe17.5. PHYSICAL REVIEW. B, CONDENSED MATTER 1987; 36:8622-8628. [PMID: 9942684 DOI: 10.1103/physrevb.36.8622] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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