1
|
Mohanta M, Jena P. Magnetism of Otherwise Nonmagnetic Elements: From Clusters to Monolayers. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2024; 128:12286-12295. [PMID: 39081559 PMCID: PMC11284855 DOI: 10.1021/acs.jpcc.4c03592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/30/2024] [Revised: 07/02/2024] [Accepted: 07/03/2024] [Indexed: 08/02/2024]
Abstract
Atomic clusters are known to exhibit properties different from their bulk phase. However, when assembled or supported on substrates, clusters often lose their uniqueness. For example, uranium and coinage metals (Cu, Ag, Au) are nonmagnetic in their bulk. Herein, we show that UX6 (X= Cu, Ag, Au) clusters, unlike their nonmagnetic bulk, are not only magnetic but also retain their magnetic character and structure when assembled into a two-dimensional (2D) material. The magnetic moment remains localized at the U site and is found to be 3μB in clusters and about 2μB in the 2D structure. In 2D UX4 (X = Cu, Ag, Au) monolayers, U atoms are found to be coupled antiferromagnetically through an indirect exchange coupling mediated by the coinage metal atoms. Furthermore, hydrogenation of these monolayers can induce a transition from the antiferromagnetic to the ferromagnetic phase. These results, based on density functional theory, have predictive capability and can motivate experiments.
Collapse
Affiliation(s)
- Manish
Kumar Mohanta
- Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Puru Jena
- Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| |
Collapse
|
2
|
Liu P, Xu H, Wang X, Tian G, Yu X, Wang C, Zeng C, Wang S, Fan F, Liu S, Shu C. 2D MXene/MBene Superlattice with Narrow Bandgap as Superior Electrocatalyst for High-Performance Lithium-Oxygen Battery. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2404483. [PMID: 39046318 DOI: 10.1002/smll.202404483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2024] [Revised: 07/09/2024] [Indexed: 07/25/2024]
Abstract
Lithium-oxygen (Li-O2) battery with large theoretical energy density (≈3500 Wh kg-1) is one of the most promising energy storage and conversion systems. However, the slow kinetics of oxygen electrode reactions inhibit the practical application of Li-O2 battery. Thus, designing efficient electrocatalysts is crucial to improve battery performance. Here, Ti3C2 MXene/Mo4/3B2-x MBene superlattice is fabricated its electrocatalytic activity toward oxygen redox reactions in Li-O2 battery is studied. It is found that the built-in electric field formed by a large work function difference between Ti3C2 and Mo4/3B2-x will power the charge transfer at the interface from titanium (Ti) site in Ti3C2 to molybdenum (Mo) site in Mo4/3B2-x. This charge transfer increases the electron density in 4d orbital of Mo site and decreases the d-band center of Mo site, thus optimizing the adsorption of intermediate product LiO2 at Mo site and accelerating the kinetics of oxygen electrode reactions. Meanwhile, the formed film-like discharge products (Li2O2) improve the contact with electrode and facilitate the decomposition of Li2O2. Based on the above advantages, the Ti3C2 MXene/Mo4/3B2-x MBene superlattice-based Li-O2 battery exhibits large discharge specific capacity (17 167 mAh g-1), low overpotential (1.16 V), and superior cycling performance (475 cycles).
Collapse
Affiliation(s)
- Pengfei Liu
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu, Sichuan, 610059, P. R. China
| | - Haoyang Xu
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu, Sichuan, 610059, P. R. China
| | - Xinxiang Wang
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu, Sichuan, 610059, P. R. China
| | - Guilei Tian
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu, Sichuan, 610059, P. R. China
| | - Xudong Yu
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu, Sichuan, 610059, P. R. China
| | - Chuan Wang
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu, Sichuan, 610059, P. R. China
| | - Chenrui Zeng
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu, Sichuan, 610059, P. R. China
| | - Shuhan Wang
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu, Sichuan, 610059, P. R. China
| | - Fengxia Fan
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu, Sichuan, 610059, P. R. China
| | - Sheng Liu
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu, Sichuan, 610059, P. R. China
| | - Chaozhu Shu
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu, Sichuan, 610059, P. R. China
| |
Collapse
|
3
|
Neyman KM, Alemany P. Chemical Orderings in CuCo Nanoparticles: Topological Modeling Using DFT Calculations. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:1242. [PMID: 39120347 PMCID: PMC11314349 DOI: 10.3390/nano14151242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2024] [Revised: 07/12/2024] [Accepted: 07/18/2024] [Indexed: 08/10/2024]
Abstract
The orderings of atoms in bimetallic 1.6-2.1 nm-large CuCo nanoparticles, important as catalytic and magnetic materials, were studied using a combination of DFT calculations with a topological approach. The structure and magnetism of Cu50Co151, Cu101Co100, Cu151Co50, and Cu303Co102 nanoparticles; their resistance to disintegrating into separate Cu and Co species; as well as the exposed surface sites, were quantified and analyzed, showing a clear preference for Cu atoms to occupy surface positions while the Co atoms tended to form a compact cluster in the interior of the nanoparticles. The surface segregation of Co atoms that are encapsulated by less-active Cu atoms, induced by the adsorption of CO molecules, was already enabled at a low coverage of adsorbed CO, providing the energy required to displace the entire compact Co species inside the Cu matrices due to a notable adsorption preference of CO for the Co sites over the Cu ones. The calculated adsorption energies and vibrational frequencies of adsorbed CO should be helpful indicators for experimentally monitoring the nature of the surface sites of CuCo nanoparticles, especially in the case of active Co surface sites emerging in the presence of CO.
Collapse
Affiliation(s)
- Konstantin M. Neyman
- ICREA (Institució Catalana de Recerca i Estudis Avançats), Pg. Lluís Companys 23, 08010 Barcelona, Spain
- Departament de Ciència de Materials i Química Física and Institut de Quimica Teòrica i Computacional (IQTCUB), Universitat de Barcelona, c/Martí i Franquès 1, 08028 Barcelona, Spain;
| | - Pere Alemany
- Departament de Ciència de Materials i Química Física and Institut de Quimica Teòrica i Computacional (IQTCUB), Universitat de Barcelona, c/Martí i Franquès 1, 08028 Barcelona, Spain;
| |
Collapse
|
4
|
Curti L, Prado Y, Michel A, Talbot D, Baptiste B, Otero E, Ohresser P, Journaux Y, Cartier-Dit-Moulin C, Dupuis V, Fleury B, Sainctavit P, Arrio MA, Fresnais J, Lisnard L. Room-temperature-persistent magnetic interaction between coordination complexes and nanoparticles in maghemite-based nanohybrids. NANOSCALE 2024; 16:10607-10617. [PMID: 38758111 DOI: 10.1039/d4nr01220h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2024]
Abstract
Maghemite nanoparticles functionalised with Co(II) coordination complexes at their surface show a significant increase of their magnetic anisotropy, leading to a doubling of the blocking temperature and a sixfold increase of the coercive field. Magnetometric studies suggest an enhancement that is not related to surface disordering, and point to a molecular effect involving magnetic exchange interactions mediated by the oxygen atoms at the interface as its source. Field- and temperature-dependent X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) studies show that the magnetic anisotropy enhancement is not limited to surface atoms and involves the core of the nanoparticle. These studies also point to a mechanism driven by anisotropic exchange and confirm the strength of the magnetic exchange interactions. The coupling between the complex and the nanoparticle persists at room temperature. Simulations based on the XMCD data give an effective exchange field value through the oxido coordination bridge between the Co(II) complex and the nanoparticle that is comparable to the exchange field between iron ions in bulk maghemite. Further evidence of the effectiveness of the oxido coordination bridge in mediating the magnetic interaction at the interface is given with the Ni(II) analog to the Co(II) surface-functionalised nanoparticles. A substrate-induced magnetic response is observed for the Ni(II) complexes, up to room temperature.
Collapse
Affiliation(s)
- Leonardo Curti
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, IPCM, F-75005, Paris, France.
| | - Yoann Prado
- Sorbonne Université, CNRS, Laboratoire de Physicochimie des Électrolytes et Nanosystèmes interfaciaux, PHENIX, F-75005, France.
| | - Aude Michel
- Sorbonne Université, CNRS, Laboratoire de Physicochimie des Électrolytes et Nanosystèmes interfaciaux, PHENIX, F-75005, France.
| | - Delphine Talbot
- Sorbonne Université, CNRS, Laboratoire de Physicochimie des Électrolytes et Nanosystèmes interfaciaux, PHENIX, F-75005, France.
| | - Benoît Baptiste
- CNRS, Sorbonne Université, IRD, MNHN, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC, F-75005, Paris, France.
| | - Edwige Otero
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, France
| | - Philippe Ohresser
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, France
| | - Yves Journaux
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, IPCM, F-75005, Paris, France.
| | | | - Vincent Dupuis
- Sorbonne Université, CNRS, Laboratoire de Physicochimie des Électrolytes et Nanosystèmes interfaciaux, PHENIX, F-75005, France.
| | - Benoit Fleury
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, IPCM, F-75005, Paris, France.
| | - Philippe Sainctavit
- CNRS, Sorbonne Université, IRD, MNHN, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC, F-75005, Paris, France.
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, France
| | - Marie-Anne Arrio
- CNRS, Sorbonne Université, IRD, MNHN, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC, F-75005, Paris, France.
| | - Jérôme Fresnais
- Sorbonne Université, CNRS, Laboratoire de Physicochimie des Électrolytes et Nanosystèmes interfaciaux, PHENIX, F-75005, France.
| | - Laurent Lisnard
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, IPCM, F-75005, Paris, France.
| |
Collapse
|
5
|
Xu G, Cui YS, Jiang XL, Xu CQ, Li J, Chen XD. Synthesis and characterization of iron clusters with an icosahedral [Fe@Fe 12] 16+ Core. Natl Sci Rev 2024; 11:nwad327. [PMID: 38487495 PMCID: PMC10939364 DOI: 10.1093/nsr/nwad327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Revised: 12/15/2023] [Accepted: 12/18/2023] [Indexed: 03/17/2024] Open
Abstract
Iron-metal clusters are crucial in a variety of critical biological and material systems, including metalloenzymes, catalysts, and magnetic storage devices. However, a synthetic high-nuclear iron cluster has been absent due to the extreme difficulty in stabilizing species with direct iron-iron bonding. In this work, we have synthesized, crystallized, and characterized a (Tp*)4W4S12(Fe@Fe12) cluster (Tp* = tris(3,5-dimethyl-1-pyrazolyl)borate(1-)), which features a rare trideca-nuclear, icosahedral [Fe@Fe12] cluster core with direct multicenter iron-iron bonding between the interstitial iron (Fei) and peripheral irons (Fep), as well as Fep···Fep ferromagnetic coupling. Quantum chemistry studies reveal that the stability of the cluster arises from the 18-electron shell-closing of the [Fe@Fe12]16+ core, assisted by its bonding interactions with the peripheral tridentate [(Tp*)WS3]4- ligands which possess both S→Fe donation and spin-polarized Fe-W σ bonds. The ground-state electron spin is theoretically predicted to be S = 32/2 for the cluster. The existence of low oxidation-state (OS ∼ +1.23) iron in this compound may find interesting applications in magnetic storage, spintronics, redox chemistry, and cluster catalysis.
Collapse
Affiliation(s)
- Gan Xu
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials and Jiangsu Key Laboratory of New Power Batteries, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China
| | - Yun-Shu Cui
- Department of Chemistry and Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Xue-Lian Jiang
- Department of Chemistry and Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Cong-Qiao Xu
- Department of Chemistry and Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Jun Li
- Department of Chemistry and Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
- Department of Chemistry and Engineering Research Center of Advanced Rare-Earth Materials of Ministry of Education, Tsinghua University, Beijing 100084, China
| | - Xu-Dong Chen
- Jiangsu Collaborative Innovation Center of Biomedical Functional Materials and Jiangsu Key Laboratory of New Power Batteries, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China
- State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, China
| |
Collapse
|
6
|
Geng L, Luo Z. Magnetic Metal Clusters and Superatoms. J Phys Chem Lett 2024; 15:1856-1865. [PMID: 38335129 DOI: 10.1021/acs.jpclett.3c03637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2024]
Abstract
Metal clusters with tunable magnetism and chemical activity are ideal models to study magnetic order changes from microstructures to macroscopic substances, to understand the spin effect in diverse catalytic reactions, and to create information carriers of qubits in quantum computation. Precise preparation, reaction, and characterization of magnetic clusters provide a platform to understand spin-exchange interactions and geometrical/electronic structure-property relationships; thus, they are beneficial for the rational design and development of new cluster-genetic materials and spintronics microdevices. Advances in this field have discovered some high-spin magnetic clusters and superatoms, expanding the understanding of magnetism, aromaticity, cluster stability, and electron delocalization. Herein we present a perspective of the experimental and theoretical progress regarding magnetic clusters and superatoms, with the expectation of stimulating more research interest in this field.
Collapse
Affiliation(s)
- Lijun Geng
- Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Zhixun Luo
- Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- School of Chemical Science, University of Chinese Academy of Sciences, Beijing 100049, China
| |
Collapse
|
7
|
Liu P, Xu H, Wang X, Tian G, Wen X, Wang C, Zeng C, Wang S, Fan F, Zeng T, Liu S, Shu C. Bimetallic MXene with tailored vanadium d-band as highly efficient electrocatalyst for reversible lithium-oxygen battery. J Colloid Interface Sci 2024; 655:364-370. [PMID: 37948810 DOI: 10.1016/j.jcis.2023.11.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Revised: 10/30/2023] [Accepted: 11/06/2023] [Indexed: 11/12/2023]
Abstract
Lithium-oxygen (Li-O2) battery possesses high theoretical energy density of ∼ 3500 Wh kg-1, yet the sluggish kinetics of oxygen redox reactions hinder its practical application. Herein, TiVC bimetallic MXene solid solution is prepared as the efficient electrocatalyst for Li-O2 battery. The results of experiment and theoretical calculations reveal that through the formation of Ti-C-V bond in TiVC, electrons transfer from V site to Ti site enhances electron delocalization of V sites, which causes the upshift of d band center of V site and strengthens the adsorption of intermediate products (LiO2) on TiVC electrode surface. Due to the strong adsorption of intermediates, the film-like Li2O2 can be formed on TiVC electrode via the surface-adsorbed pathway, which ensures the full contact between the electrode and discharged product and thus facilitates the charge transfer between TiVC electrode and oxygen species during charge process. As a consequence, the TiVC based Li-O2 battery exhibits superior electrochemical performance including large discharge capacity (12780 mAh/g) and extended cycling stability (422 cycles) at the current density of 300 mA g-1.
Collapse
Affiliation(s)
- Pengfei Liu
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu 610059, Sichuan, PR China
| | - Haoyang Xu
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu 610059, Sichuan, PR China
| | - Xinxiang Wang
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu 610059, Sichuan, PR China
| | - Guilei Tian
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu 610059, Sichuan, PR China
| | - Xiaojuan Wen
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu 610059, Sichuan, PR China
| | - Chuan Wang
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu 610059, Sichuan, PR China
| | - Chenrui Zeng
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu 610059, Sichuan, PR China
| | - Shuhan Wang
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu 610059, Sichuan, PR China
| | - Fengxia Fan
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu 610059, Sichuan, PR China
| | - Ting Zeng
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu 610059, Sichuan, PR China
| | - Sheng Liu
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu 610059, Sichuan, PR China
| | - Chaozhu Shu
- College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu 610059, Sichuan, PR China.
| |
Collapse
|
8
|
Hajra A, Chattopadhyay A. Dimension-Dependent Magnetic Behavior of Manganese-Cysteine Inorganic Complex Nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023. [PMID: 37307283 DOI: 10.1021/acs.langmuir.3c00531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
A cysteine-based complex of Mn2+ led to the formation of nanoparticles in aqueous medium under ambient conditions. The formation and evolution of the nanoparticles in the medium were followed by ultraviolet-visible light (UV-vis) spectroscopy, circular dichroism, and electron spin resonance spectroscopy that also revealed a first-order process. The magnetic properties of the nanoparticles isolated as solid powders exhibited strong crystallite and particle size dependence. At low crystallite size, as well as particle size, the complex nanoparticles showed superparamagnetic behavior similar to other magnetic inorganic nanoparticles. The magnetic nanoparticles were found to undergo a superparamagnetic to ferromagnetic transition, and then to paramagnetic transition with a gradual increase in either their crystallite size or particle size. The discovery of dimension-dependent magnetic property of inorganic complex nanoparticles may usher in a superior option for tuning the magnetic behavior of nanocrystals, depending on the component ligands and metal ions.
Collapse
Affiliation(s)
- Archismita Hajra
- Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Arun Chattopadhyay
- Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| |
Collapse
|
9
|
Mamontova E, Trabbia C, Favier I, Serrano-Maldonado A, Ledeuil JB, Madec L, Gómez M, Pla D. Novel Catalyst Composites of Ni- and Co-Based Nanoparticles Supported on Inorganic Oxides for Fatty Acid Hydrogenations. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:nano13091435. [PMID: 37176980 PMCID: PMC10180328 DOI: 10.3390/nano13091435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 04/17/2023] [Accepted: 04/19/2023] [Indexed: 05/15/2023]
Abstract
In the quest to develop nanometrically defined catalytic systems for applications in the catalytic valorization of agri-food wastes, small Ni-based nanoparticles supported on inorganic solid supports have been prepared by decomposition of organometallic precursors in refluxing ethanol under H2 atmosphere, in the presence of supports exhibiting insulating or semi-conductor properties, such as MgAl2O4 and TiO2, respectively. The efficiency of the as-prepared Ni-based nanocomposites has been evaluated towards the hydrogenation of unsaturated fatty acids under solvent-free conditions, with high selectivity regarding the hydrogenation of C=C bonds. The influence of the support on the catalytic performance of the prepared Ni-based nanocomposites is particularly highlighted.
Collapse
Affiliation(s)
- Ekaterina Mamontova
- Laboratoire Hétérochimie Fondamentale et Appliquée, UMR CNRS 5069, Université Toulouse III-Paul Sabatier, 118 Route de Narbonne, CEDEX 9, 31062 Toulouse, France
| | - Corine Trabbia
- Laboratoire Hétérochimie Fondamentale et Appliquée, UMR CNRS 5069, Université Toulouse III-Paul Sabatier, 118 Route de Narbonne, CEDEX 9, 31062 Toulouse, France
| | - Isabelle Favier
- Laboratoire Hétérochimie Fondamentale et Appliquée, UMR CNRS 5069, Université Toulouse III-Paul Sabatier, 118 Route de Narbonne, CEDEX 9, 31062 Toulouse, France
| | - Alejandro Serrano-Maldonado
- Laboratoire Hétérochimie Fondamentale et Appliquée, UMR CNRS 5069, Université Toulouse III-Paul Sabatier, 118 Route de Narbonne, CEDEX 9, 31062 Toulouse, France
| | - Jean-Bernard Ledeuil
- E2S UPPA, CNRS, IPREM, Université de Pau et des Pays de l'Adour, 64053 Pau, France
| | - Lénaïc Madec
- E2S UPPA, CNRS, IPREM, Université de Pau et des Pays de l'Adour, 64053 Pau, France
| | - Montserrat Gómez
- Laboratoire Hétérochimie Fondamentale et Appliquée, UMR CNRS 5069, Université Toulouse III-Paul Sabatier, 118 Route de Narbonne, CEDEX 9, 31062 Toulouse, France
| | - Daniel Pla
- Laboratoire Hétérochimie Fondamentale et Appliquée, UMR CNRS 5069, Université Toulouse III-Paul Sabatier, 118 Route de Narbonne, CEDEX 9, 31062 Toulouse, France
| |
Collapse
|
10
|
Dai Y, Liu B, Zhang Z, Guo P, Liu C, Zhang Y, Zhao L, Wang Z. Tailoring the d-Orbital Splitting Manner of Single Atomic Sites for Enhanced Oxygen Reduction. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2210757. [PMID: 36773335 DOI: 10.1002/adma.202210757] [Citation(s) in RCA: 28] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2022] [Revised: 01/12/2023] [Indexed: 06/18/2023]
Abstract
Regulating the electronic states of single atomic sites around the Fermi level remains a major concern for boosting the electrocatalytic oxygen reduction reaction (ORR). Herein, a Fe d-orbital splitting manner modulation strategy by constructing axial coordination on FeN4 sites is presented. Experimental investigations and theoretical calculations reveal that the axial tractions induce the distortion of square-planar field (FeN4 SP), up to the quasi-octahedral coordination (FeN4 O1 OCquasi ), thus leading to the electron rearrangement with a diluted spin polarization. The declined population of unpaired electrons in dz 2 , dx z and dyz states engenders a moderate adsorption of ORR intermediates, thereby reinforcing the intrinsic reaction activity. In situ infrared spectroscopy further demonstrates that the reordering of d-orbital splitting and occupation facilitates the desorption of *OH. The FeN4 O1 OCquasi exhibits a dramatic improvement of kinetic current density and turnover frequency, which are fivefold and tenfold higher than those of FeN4 SP. This work presents a novel understanding on improving the electrocatalytic performance through the orbital-scale manipulation.
Collapse
Affiliation(s)
- Yunkun Dai
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, State Key Lab of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China
| | - Bo Liu
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, State Key Lab of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China
| | - Ziyu Zhang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, State Key Lab of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China
| | - Pan Guo
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, State Key Lab of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China
| | - Chang Liu
- College of Materials Science and Engineering, Shenzhen University, Shenzhen, Guangdong, 518071, P. R. China
| | - Yunlong Zhang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, State Key Lab of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China
| | - Lei Zhao
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, State Key Lab of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China
| | - Zhenbo Wang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, State Key Lab of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, P. R. China
- College of Materials Science and Engineering, Shenzhen University, Shenzhen, Guangdong, 518071, P. R. China
| |
Collapse
|
11
|
Paranthaman S, Vedamanickam N, Ganesan M, Sampathkumar S. Structure, Stability, Electronic and Magnetic Properties of FemBin (m + n = 2–4) Clusters: A DFT Study. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2022. [DOI: 10.1134/s0036024422110279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
12
|
Miao L, Liu Z, Chen Z, Wang X, Zhou Z, Zhao J, Fang S, Yin G, Jia Z, Liu J, Moro R, deHeer WA, Ma L. Fourth generation cryogenic neutral cluster beam apparatus for studying fundamental properties of metallic clusters. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2022; 93:113310. [PMID: 36461426 DOI: 10.1063/5.0087524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Accepted: 10/13/2022] [Indexed: 06/17/2023]
Abstract
A cryogenic beam apparatus for studying neutral clusters has been built and tested. The lowest beam temperature reaches less than 9 K at a repetition rate of 20 Hz. Mechanical decoupling from the refrigerator avoids misalignment during temperature ramping. Adopting a permanent magnet based magnetic deflector eliminates the hysteresis and electric noise of the traditional electromagnet and offers excellent reproducibility of the applied magnetic field. The mass spectrometer can operate in either Mass Spectroscopy Time-Of-Flight mode or Position-Sensitive Time-Of-Flight mode with spatial resolution better than 7 μm. Its performance is demonstrated with niobium and cobalt clusters.
Collapse
Affiliation(s)
- Lin Miao
- Tianjin International Center for Nanoparticles and Nanosystems, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China
| | - Zhaojun Liu
- Tianjin International Center for Nanoparticles and Nanosystems, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China
| | - Zeyang Chen
- Tianjin International Center for Nanoparticles and Nanosystems, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China
| | - Xiaohan Wang
- Tianjin International Center for Nanoparticles and Nanosystems, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China
| | - Ziwen Zhou
- Tianjin International Center for Nanoparticles and Nanosystems, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China
| | - Jinbo Zhao
- Tianjin International Center for Nanoparticles and Nanosystems, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China
| | - Shaozheng Fang
- Tianjin International Center for Nanoparticles and Nanosystems, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China
| | - Guangjia Yin
- Tianjin International Center for Nanoparticles and Nanosystems, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China
| | - Zezhao Jia
- Tianjin International Center for Nanoparticles and Nanosystems, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China
| | - Jin Liu
- Tianjin International Center for Nanoparticles and Nanosystems, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China
| | - Ramiro Moro
- Tianjin International Center for Nanoparticles and Nanosystems, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China
| | - Walt A deHeer
- School of Physics, Georgia Institute of Technology, 837 North Ave. NW, Atlanta, Georgia 30332, USA
| | - Lei Ma
- Tianjin International Center for Nanoparticles and Nanosystems, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China
| |
Collapse
|
13
|
Ferrari P, Gómez-Coca S. The spin magnetic order of Co n+ ( n ≤ 5) clusters. Phys Chem Chem Phys 2022; 24:23128-23134. [PMID: 36128751 DOI: 10.1039/d2cp03643f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The magnetism of transition metal clusters has been for decades a complicated puzzle, with experimental results disagreeing with calculations performed within the density functional theory formalism. In this work, we provide a key to this puzzle by investigating the lowest-energy spin states of cobalt cluster, Con+ (n ≤ 5), using CASSCF/NEVPT2 calculations with very large active spaces. The geometries as well as the spin configurations adopted by the clusters in their ground-state are known from experiments, making Con+ clusters an ideal model system for theoretical investigation. Here, using the experimentally known geometries determined by far-infrared spectroscopy as inputs, we calculated the lowest-energy spin configurations of the clusters, revealing that the CASSCF/NEVPT2 formalism correctly predicts the preferred electronic configuration of the clusters known experimentally. This is in contrast to the widely used density functional theory, with results that depend on the selected exchange-correlation functional. The reasons for the failure of density functional theory, in opposition to CASSCF/NEVPT2, are discussed, providing a solid framework for investigating other transition metal and transition metal oxide clusters.
Collapse
Affiliation(s)
- Piero Ferrari
- Quantum Solid-State Physics, Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200d, 3001, Leuven, Belgium. .,Institute for Molecules and Materials, FELIX Laboratory, Radboud University, Toernooiveld 7, 6525 ED, Nijmegen, The Netherlands
| | - Silvia Gómez-Coca
- Departament de Química Inorgànica i Orgànica and Institut de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 645, 08028, Barcelona, Spain.
| |
Collapse
|
14
|
Ramírez-Morales MA, Goldt AE, Kalachikova PM, Ramirez B. JA, Suzuki M, Zhigach AN, Ben Salah A, Shurygina LI, Shandakov SD, Zatsepin T, Krasnikov DV, Maekawa T, Nikolaev EN, Nasibulin AG. Albumin Stabilized Fe@C Core-Shell Nanoparticles as Candidates for Magnetic Hyperthermia Therapy. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:2869. [PMID: 36014734 PMCID: PMC9414223 DOI: 10.3390/nano12162869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 07/28/2022] [Accepted: 08/18/2022] [Indexed: 06/15/2023]
Abstract
Carbon-encapsulated iron nanoparticles (Fe@C) with a mean diameter of 15 nm have been synthesized using evaporation-condensation flow-levitation method by the direct iron-carbon gas-phase reaction at high temperatures. Further, Fe@C were stabilized with bovine serum albumin (BSA) coating, and their electromagnetic properties were evaluated to test their performance in magnetic hyperthermia therapy (MHT) through a specific absorption rate (SAR). Heat generation was observed at different Fe@C concentrations (1, 2.5, and 5 mg/mL) when applied 331 kHz and 60 kA/m of an alternating magnetic field, resulting in SAR values of 437.64, 129.36, and 50.4 W/g for each concentration, respectively. Having such high SAR values at low concentrations, obtained material is ideal for use in MHT.
Collapse
Affiliation(s)
- Maria Antonieta Ramírez-Morales
- Skolkovo Institute of Science and Technology, 3 Nobel Street, 121205 Moscow, Russia
- Hi-QNano s.r.l., Via Barsanti No. 1, 73010 Arnesano, Italy
- Department of Engineering of Innovation, University of Salento, Via per Arnesano km 1, 73100 Lecce, Italy
| | - Anastasia E. Goldt
- Skolkovo Institute of Science and Technology, 3 Nobel Street, 121205 Moscow, Russia
| | - Polina M. Kalachikova
- Skolkovo Institute of Science and Technology, 3 Nobel Street, 121205 Moscow, Russia
- School of Chemical Engineering, Aalto University, Kemistintie 1, 02015 Espoo, Finland
| | - Javier A. Ramirez B.
- Skolkovo Institute of Science and Technology, 3 Nobel Street, 121205 Moscow, Russia
| | - Masashi Suzuki
- Graduate School of Interdisciplinary New Science, Toyo University, Kawagoe 350-8585, Saitama, Japan
- Bio-Nano Electronics Research Center, Toyo University, Kawagoe 350-8585, Saitama, Japan
| | - Alexey N. Zhigach
- V.L. Talrose Institute for Energy Problems of Chemical Physics at Federal Research Center of Chemical Physics, Russian Academy of Sciences, Leninsky Prospect 38 Building 2, 119334 Moscow, Russia
| | - Asma Ben Salah
- Graduate School of Interdisciplinary New Science, Toyo University, Kawagoe 350-8585, Saitama, Japan
- Bio-Nano Electronics Research Center, Toyo University, Kawagoe 350-8585, Saitama, Japan
| | | | | | - Timofei Zatsepin
- Skolkovo Institute of Science and Technology, 3 Nobel Street, 121205 Moscow, Russia
| | - Dmitry V. Krasnikov
- Skolkovo Institute of Science and Technology, 3 Nobel Street, 121205 Moscow, Russia
| | - Toru Maekawa
- Graduate School of Interdisciplinary New Science, Toyo University, Kawagoe 350-8585, Saitama, Japan
- Bio-Nano Electronics Research Center, Toyo University, Kawagoe 350-8585, Saitama, Japan
| | - Evgeny N. Nikolaev
- Skolkovo Institute of Science and Technology, 3 Nobel Street, 121205 Moscow, Russia
| | - Albert G. Nasibulin
- Skolkovo Institute of Science and Technology, 3 Nobel Street, 121205 Moscow, Russia
- School of Chemical Engineering, Aalto University, Kemistintie 1, 02015 Espoo, Finland
| |
Collapse
|
15
|
Fu C, Huang J, Jiang Y, Li H. Invar Effect of the Fe 13 Cluster. J Phys Chem Lett 2022; 13:6644-6650. [PMID: 35838642 DOI: 10.1021/acs.jpclett.2c01405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The Invar effect, which refers to magnetic alloys having an anomalously small thermal expansion, has been under extensive investigations over the past century. However, study on the thermal expansion of clusters and their Invar effect is still lacking. In this letter, we calculate the thermal expansion properties of Fe13-nNin (n = 0, 3, 6, 9, 12, 13) clusters and find that the Fe13 cluster has an abnormally small thermal expansion, which is due to its remarkable magneto-volume effect. It is also revealed that the strong magneto-volume effect of the Fe13 cluster is highly related with the two magnetic states, the same as the interpretation for the Invar effect of a bulk alloy. The anomalously small thermal expansion of the Fe13 cluster is the manifestation of the Invar effect at the cluster scale.
Collapse
Affiliation(s)
- Chengrui Fu
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, China
| | - Jian Huang
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, China
| | - Yanyan Jiang
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, China
| | - Hui Li
- Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061, China
| |
Collapse
|
16
|
Wang Y, Ren X, Jiang B, Deng M, Zhao X, Pang R, Li SF. Synergetic Catalysis of Magnetic Single-Atom Catalysts Confined in Graphitic-C 3N 4/CeO 2(111) Heterojunction for CO Oxidization. J Phys Chem Lett 2022; 13:6367-6375. [PMID: 35796604 DOI: 10.1021/acs.jpclett.2c01605] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Magnetic single-atom catalysts (MSAC), due to the intrinsic spin degree of freedom, are of particular importance relative to other conventional SAC for applications in various catalytic processes, especially in those cases that involve spin-triplet O2. However, the bottleneck issue in this field is the clustering of the SAC during the processes. Here using first-principles calculations we predict that Mn atoms can be readily confined in the interface of the porous g-C3N4/CeO2(111) heterostructure, forming high-performance MSAC for O2 activation via a delicate synergetic mechanism of charge transfer, mainly provided by the p-block g-C3N4 overlayer mediated by the d-block Mn active site, and spin selection, preserved mainly through active participation of the f-block Ce atoms and/or g-C3N4, which effectively promotes the CO oxidization. Such a recipe is also demonstrated to be valid for V- and Nb-MSACs, which may shed new light on the design of highly efficient MSACs for various important chemical processes wherein spin-selection matters.
Collapse
Affiliation(s)
- Yueyang Wang
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, China
| | - Xiaoyan Ren
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, China
| | - Bojie Jiang
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, China
| | - Meng Deng
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, China
| | - Xingju Zhao
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, China
| | - Rui Pang
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, China
| | - S F Li
- School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 450001, China
| |
Collapse
|
17
|
Tan LP, Chaudhary V, Tsakadze Z, Ramanujan RV. Rapid multiple property determination from bulk materials libraries prepared from chemically synthesized powders. Sci Rep 2022; 12:9504. [PMID: 35680980 PMCID: PMC9184742 DOI: 10.1038/s41598-022-13691-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Accepted: 05/26/2022] [Indexed: 11/12/2022] Open
Abstract
A variety of high-performance materials are utilized in electrical, electronic, and mechanical systems. Such systems account for a significant fraction of the world’s electricity consumption. The next generation of such systems urgently require new material compositions which possess a better combination of both structural and functional properties. Only accelerated methodologies can rapidly determine the required multiple property set. Hence, a range of iron–cobalt–nickel ternary alloy composition powders were chemically synthesized. Compositionally graded bulk materials libraries were prepared by spark plasma sintering of these powders. A multiple property set of the crystal structure, magnetic, mechanical, and electrical properties were determined for a range of compositions. This property set revealed that a good combination of magnetic and mechanical properties can be obtained from Fe50Co40Ni10, high electrical resistivity from Fe54Co17Ni29 and high saturation magnetization as well as high hardness from Fe57Co29Ni14. Thus, this multiple property library, developed by accelerated methodologies, can be utilized to identify new ternary compositions satisfying diverse property sets relevant to next generation systems.
Collapse
Affiliation(s)
- Li Ping Tan
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore
| | - V Chaudhary
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore
| | - Z Tsakadze
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore
| | - R V Ramanujan
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore.
| |
Collapse
|
18
|
Dahal BR, Savadkoohi M, Grizzle A, D'Angelo C, Lamberti V, Tyagi P. Easy axis anisotropy creating high contrast magnetic zones on magnetic tunnel junctions based molecular spintronics devices (MTJMSD). Sci Rep 2022; 12:5721. [PMID: 35388032 PMCID: PMC8986785 DOI: 10.1038/s41598-022-09321-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Accepted: 03/15/2022] [Indexed: 11/09/2022] Open
Abstract
Magnetic tunnel junction-based molecular spintronics device (MTJMSD) may enable novel magnetic metamaterials by chemically bonding magnetic molecules and ferromagnets (FM) with a vast range of magnetic anisotropy. MTJMSD have experimentally shown intriguing microscopic phenomenon such as the development of highly contrasting magnetic phases on a ferromagnetic electrode at room temperature. This paper focuses on Monte Carlo Simulations (MCS) on MTJMSD to understand the potential mechanism and explore fundamental knowledge about the impact of magnetic anisotropy. The selection of MCS is based on our prior study showing the potential of MCS in explaining experimental results (Tyagi et al. in Nanotechnology 26:305602, 2015). In this paper, MCS is carried out on the 3D Heisenberg model of cross-junction-shaped MTJMSDs. Our research represents the experimentally studied cross-junction-shaped MTJMSD where paramagnetic molecules are covalently bonded between two FM electrodes along the exposed side edges of the magnetic tunnel junction (MTJ). We have studied atomistic MTJMSDs properties by simulating a wide range of easy-axis anisotropy for the case of experimentally observed predominant molecule-induced strong antiferromagnetic coupling. Our study focused on understanding the effect of anisotropy of the FM electrodes on the overall MTJMSDs at various temperatures. This study shows that the multiple domains of opposite spins start to appear on an FM electrode as the easy-axis anisotropy increases. Interestingly, MCS results resembled the experimentally observed highly contrasted magnetic zones on the ferromagnetic electrodes of MTJMSD. The magnetic phases with starkly different spins were observed around the molecular junction on the FM electrode with high anisotropy.
Collapse
Affiliation(s)
- Bishnu R Dahal
- Center for Nanotechnology Research and Education, Mechanical Engineering, University of the District of Columbia, Washington, DC, 20008, USA
| | - Marzieh Savadkoohi
- Center for Nanotechnology Research and Education, Mechanical Engineering, University of the District of Columbia, Washington, DC, 20008, USA
| | - Andrew Grizzle
- Center for Nanotechnology Research and Education, Mechanical Engineering, University of the District of Columbia, Washington, DC, 20008, USA
| | - Christopher D'Angelo
- Center for Nanotechnology Research and Education, Mechanical Engineering, University of the District of Columbia, Washington, DC, 20008, USA
| | - Vincent Lamberti
- Y-12 National Security Complex, 301 Bear Creek Rd, Oak Ridge, TN, 37830, USA
| | - Pawan Tyagi
- Center for Nanotechnology Research and Education, Mechanical Engineering, University of the District of Columbia, Washington, DC, 20008, USA.
| |
Collapse
|
19
|
Efficient Formation of Size-Selected Clusters upon Pickup of Dopants into Multiply Charged Helium Droplets. Int J Mol Sci 2022; 23:ijms23073613. [PMID: 35408968 PMCID: PMC8998201 DOI: 10.3390/ijms23073613] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 03/18/2022] [Accepted: 03/24/2022] [Indexed: 02/01/2023] Open
Abstract
Properties of clusters often depend critically on the exact number of atomic or molecular building blocks, however, most methods of cluster formation lead to a broad, size distribution and cluster intensity anomalies that are often designated as magic numbers. Here we present a novel approach of breeding size-selected clusters via pickup of dopants into multiply charged helium nanodroplets. The size and charge state of the initially undoped droplets and the vapor pressure of the dopant in the pickup region, determines the size of the dopant cluster ions that are extracted from the host droplets, via evaporation of the helium matrix in a collision cell filled with room temperature helium or via surface collisions. Size distributions of the selected dopant cluster ions are determined utilizing a high-resolution time of flight mass spectrometer. The comparison of the experimental data, with simulations taking into consideration the pickup probability into a shrinking He droplet due to evaporation during the pickup process, provides a simple explanation for the emergence of size distributions that are narrower than Poisson.
Collapse
|
20
|
Mahmood AU, Yingling YG. All-Atom Simulation Method for Zeeman Alignment and Dipolar Assembly of Magnetic Nanoparticles. J Chem Theory Comput 2022; 18:3122-3135. [PMID: 35271259 DOI: 10.1021/acs.jctc.1c01253] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Magnetic nanoparticles (MNPs) can organize into novel structures in solutions with excellent order and unique geometries. However, studies of the self-assembly of smaller MNPs are challenging due to a complicated interplay between external magnetic fields and van der Waals, electrostatic, dipolar, steric, and hydrodynamic interactions. Here, we present a novel all-atom molecular dynamics simulation method to enable detailed studies of the dynamics, self-assembly, structure, and properties of MNPs as a function of core sizes and shapes, ligand chemistry, solvent properties, and external field. We demonstrate the use and effectiveness of the model by simulating the self-assembly of oleic acid ligand-functionalized magnetite (Fe3O4) nanoparticles, with spherical and cubic shapes, into rings, lines, chains, and clusters under a uniform external magnetic field. We found that the long-range electrostatic interactions can favor the formation of a chain over a ring, the ligands promote MNP cluster growth, and the solvent can reduce the rotational diffusion of the MNPs. The algorithm has been parallelized to take advantage of multiple processors of a modern computer and can be used as a plugin for the popular simulation software LAMMPS to study the behavior of small MNPs and gain insights into the physics and chemistry of different magnetic assembly processes with atomistic details.
Collapse
Affiliation(s)
- Akhlak U Mahmood
- Department of Materials Science and Engineering, NC State University, Raleigh, North Carolina 27695, United States
| | - Yaroslava G Yingling
- Department of Materials Science and Engineering, NC State University, Raleigh, North Carolina 27695, United States
| |
Collapse
|
21
|
Ehrhard AA, Klein MP, Mohrbach J, Dillinger S, Niedner-Schatteburg G. Cryo kinetics of N2 adsorption onto bimetallic rhodium–iron clusters in isolation. J Chem Phys 2022; 156:054308. [DOI: 10.1063/5.0075286] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Amelie A. Ehrhard
- Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| | - Matthias P. Klein
- Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| | - Jennifer Mohrbach
- Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| | - Sebastian Dillinger
- Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| | - Gereon Niedner-Schatteburg
- Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| |
Collapse
|
22
|
Straßner A, Klein MP, Fries DV, Wiehn C, Huber ME, Mohrbach J, Dillinger S, Spelsberg D, Armentrout PB, Niedner-Schatteburg G. Kinetics of stepwise nitrogen adsorption by size-selected iron cluster cations: Evidence for size-dependent nitrogen phobia. J Chem Phys 2021; 155:244306. [PMID: 34972360 DOI: 10.1063/5.0064965] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present a study of stepwise cryogenic N2 adsorption on size-selected Fen + (n = 8-20) clusters within a hexapole collision cell held at T = 21-28 K. The stoichiometries of the observed adsorption limits and the kinetic fits of stepwise N2 uptake reveal cluster size-dependent variations that characterize four structural regions. Exploratory density functional theory studies support tentative structural assignment in terms of icosahedral, hexagonal antiprismatic, and closely packed structural motifs. There are three particularly noteworthy cases, Fe13 + with a peculiar metastable adsorption limit, Fe17 + with unprecedented nitrogen phobia (inefficient N2 adsorption), and Fe18 + with an isomeric mixture that undergoes relaxation upon considerable N2 uptake.
Collapse
Affiliation(s)
- Annika Straßner
- Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| | - Matthias P Klein
- Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| | - Daniela V Fries
- Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| | - Christopher Wiehn
- Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| | - Maximilian E Huber
- Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| | - Jennifer Mohrbach
- Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| | - Sebastian Dillinger
- Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| | - Dirk Spelsberg
- Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| | - P B Armentrout
- Department of Chemistry, Univerdstsity of Utah, Salt Lake City, Utah 84112, USA
| | - Gereon Niedner-Schatteburg
- Fachbereich Chemie and Forschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| |
Collapse
|
23
|
Das A, Balasubramanian C, Orpe P, Pugliese GM, Puri A, Marcelli A, Saini NL. Morphological, electronic, and magnetic properties of multicomponent cobalt oxide nanoparticles synthesized by high temperature arc plasma. NANOTECHNOLOGY 2021; 33:095603. [PMID: 34666324 DOI: 10.1088/1361-6528/ac30f5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2021] [Accepted: 10/19/2021] [Indexed: 06/13/2023]
Abstract
Many technological applications demand large amount of nanoparticles with well-defined properties, which is feasible only by using large-scale production methods. In this framework, we have performed structural and local geometric investigations of cobalt oxide nanoparticles synthesized by high temperature arc plasma route in helium and in air atmosphere with different arc currents, a competitive and low cost technological approach to synthesize large quantity of different types of nanoparticles. The complex scenario of phase fraction, shape, size distribution and hysteresis loop features of high temperature arc plasma synthesis of nanoparticles can be determined by the arc current and the selected gas. X-ray diffraction patterns reveal a multicomponent phase formation containing cubic cobaltous oxide (CoO), cobaltic oxide (Co3O4) and metallic cobalt phases. The synthesis of different phases is confirmed by x-ray absorption spectroscopy measurements at the CoK-edge. Both extended x-ray absorption fine structure and x-ray absorption near edge structure analyses show the presence of metallic nanoparticles in He ambient at high arc current. Moreover, high-resolution transmission electron microscopy images and magnetic hysteresis loop measurements show that the mean particle size increases and the coercivity decreases with increasing arc current in air ambient due to the intense particle-particle interaction. At variance, in He ambient synthesized samples due to the high quenching rate and the high thermal conductivity, a multi-domain formation in which the nanoparticles' crystalline fraction decreases and a fluctuating coercivity due to core-shell structure is observed.
Collapse
Affiliation(s)
- Arkaprava Das
- Atmospheric Plasma Div., FCIPT Campus, Institute for Plasma Research, Gandhinagar-382016, India
| | - C Balasubramanian
- Atmospheric Plasma Div., FCIPT Campus, Institute for Plasma Research, Gandhinagar-382016, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai, Maharashtra-400 094, India
| | - Prachi Orpe
- Atmospheric Plasma Div., FCIPT Campus, Institute for Plasma Research, Gandhinagar-382016, India
- Department of Physical Science, Institute of Science, Nirma University, Ahmedabad 382 481, India
| | | | - Alessandro Puri
- CNR-IOM-OGG c/o ESRF-The European Synchrotron, 71 Avenue des Martyrs, F-38000 Grenoble, France
| | - Augusto Marcelli
- INFN-Laboratori Nazionali di Frascati, Via E. Fermi 54, I-00044 Frascati (RM), Italy
- CNR-Istituto Struttura della Materia and Elettra-Sincrotrone Trieste, Basovizza Area Science Park I-34149, Trieste, Italy
- RICMASS, Rome International Center for Materials Science Superstripes, Via dei Sabelli 119A, I-00185 Rome, Italy
| | - Naurang L Saini
- Sapienza Università di Roma, P.le Aldo Moro 2, I-00185, Rome, Italy
| |
Collapse
|
24
|
Das S, Chowdhury A. Recent advancements of g-C 3N 4-based magnetic photocatalysts towards the degradation of organic pollutants: a review. NANOTECHNOLOGY 2021; 33:072004. [PMID: 34731840 DOI: 10.1088/1361-6528/ac3614] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Accepted: 11/02/2021] [Indexed: 06/13/2023]
Abstract
Heterogeneous photocatalysis premised on advanced oxidation processes has witnessed a broad application perspective, including water purification and environmental remediation. In particular, the graphitic carbon nitride (g-C3N4), an earth-abundant metal-free conjugated polymer, has acquired extensive application scope and interdisciplinary consideration owing to its outstanding structural and physicochemical properties. However, several issues such as the high recombination rate of the photo-generated electron-hole pairs, smaller specific surface area, and lower electrical conductivity curtail the catalytic efficacy of bulk g-C3N4. Another challenging task is separating the catalyst from the reaction medium, limiting their reusability and practical applications. Therefore, several methodologies are adopted strategically to tackle these issues. Attention is being paid, especially to the magnetic nanocomposites (NCs) based catalysts to enhance efficiency and proficient reusability property. This review summarizes the latest progress related to the design and development of magnetic g-C3N4-based NCs and their utilization in photocatalytic systems. The usefulness of the semiconductor heterojunctions on the catalytic activity, working mechanism, and degradation of pollutants are discussed in detail. The major challenges and prospects of using magnetic g-C3N4-based NCs for photocatalytic applications are highlighted in this report.
Collapse
Affiliation(s)
- Suma Das
- Organic Electronics & Sensor Laboratory, Department of Physics, National Institute of Technology Silchar, Assam 788010, India
| | - Avijit Chowdhury
- Organic Electronics & Sensor Laboratory, Department of Physics, National Institute of Technology Silchar, Assam 788010, India
- Department of Condensed Matter Physics and Material Sciences, S. N. Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata 700106, India
| |
Collapse
|
25
|
Lyon K, Rusz J. Parameterization of magnetic vector potentials and fields for efficient multislice calculations of elastic electron scattering. Acta Crystallogr A Found Adv 2021; 77:509-518. [PMID: 34726629 PMCID: PMC8573848 DOI: 10.1107/s2053273321008792] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Accepted: 08/23/2021] [Indexed: 11/21/2022] Open
Abstract
The multislice method, which simulates the propagation of the incident electron wavefunction through a crystal, is a well established method for analysing the multiple scattering effects that an electron beam may undergo. The inclusion of magnetic effects into this method proves crucial towards simulating enhanced magnetic interaction of vortex beams with magnetic materials, calculating magnetic Bragg spots or searching for magnon signatures, to name a few examples. Inclusion of magnetism poses novel challenges to the efficiency of the multislice method for larger systems, especially regarding the consistent computation of magnetic vector potentials A and magnetic fields B over large supercells. This work presents a tabulation of parameterized magnetic (PM) values for the first three rows of transition metal elements computed from atomic density functional theory (DFT) calculations, allowing for the efficient computation of approximate A and B across large crystals using only structural and magnetic moment size and direction information. Ferromagnetic b.c.c. (body-centred cubic) Fe and tetragonal FePt are chosen to showcase the performance of PM values versus directly obtaining A and B from the unit-cell spin density by DFT. The magnetic fields of b.c.c. Fe are well described by the PM approach while for FePt the PM approach is less accurate due to deformations in the spin density. Calculations of the magnetic signal, namely the change due to A and B of the intensity of diffraction patterns, show that the PM approach for both b.c.c. Fe and FePt is able to describe the effects of magnetism in these systems to a good degree of accuracy.
Collapse
Affiliation(s)
- Keenan Lyon
- Department of Physics and Astronomy, Uppsala University, Box 516, S-751 20 Uppsala, Sweden
| | - Jan Rusz
- Department of Physics and Astronomy, Uppsala University, Box 516, S-751 20 Uppsala, Sweden
| |
Collapse
|
26
|
López-Martín R, Burgos BS, Normile PS, De Toro JA, Binns C. Gas Phase Synthesis of Multi-Element Nanoparticles. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:2803. [PMID: 34835568 PMCID: PMC8618514 DOI: 10.3390/nano11112803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 10/01/2021] [Accepted: 10/04/2021] [Indexed: 11/16/2022]
Abstract
The advantages of gas-phase synthesis of nanoparticles in terms of size control and flexibility in choice of materials is well known. There is increasing interest in synthesizing multi-element nanoparticles in order to optimize their performance in specific applications, and here, the flexibility of material choice is a key advantage. Mixtures of almost any solid materials can be manufactured and in the case of core-shell particles, there is independent control over core size and shell thickness. This review presents different methods of producing multi-element nanoparticles, including the use of multiple targets, alloy targets and in-line deposition methods to coat pre-formed cores. It also discusses the factors that produce alloy, core-shell or Janus morphologies and what is possible or not to synthesize. Some applications of multi-element nanoparticles in medicine will be described.
Collapse
Affiliation(s)
| | | | | | | | - Chris Binns
- Departamento de Física Aplicada, Instituto Regional de Investigación Científica Aplicada (IRICA), Universidad de Castilla la Mancha, 13071 Ciudad Real, Spain; (R.L.-M.); (B.S.B.); (P.S.N.); (J.A.D.T.)
| |
Collapse
|
27
|
Khanna SN, Reber AC, Bista D, Sengupta T, Lambert R. The superatomic state beyond conventional magic numbers: Ligated metal chalcogenide superatoms. J Chem Phys 2021; 155:120901. [PMID: 34598575 DOI: 10.1063/5.0062582] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The field of cluster science is drawing increasing attention due to the strong size and composition-dependent properties of clusters and the exciting prospect of clusters serving as the building blocks for materials with tailored properties. However, identifying a unifying central paradigm that provides a framework for classifying and understanding the diverse behaviors is an outstanding challenge. One such central paradigm is the superatom concept that was developed for metallic and ligand-protected metallic clusters. The periodic electronic and geometric closed shells in clusters result in their properties being based on the stability they gain when they achieve closed shells. This stabilization results in the clusters having a well-defined valence, allowing them to be classified as superatoms-thus extending the Periodic Table to a third dimension. This Perspective focuses on extending the superatomic concept to ligated metal-chalcogen clusters that have recently been synthesized in solutions and form assemblies with counterions that have wide-ranging applications. Here, we illustrate that the periodic patterns emerge in the electronic structure of ligated metal-chalcogenide clusters. The stabilization gained by the closing of their electronic shells allows for the prediction of their redox properties. Further investigations reveal how the selection of ligands may control the redox properties of the superatoms. These ligated clusters may serve as chemical dopants for two-dimensional semiconductors to control their transport characteristics. Superatomic molecules of multiple metal-chalcogen superatoms allow for the formation of nano-p-n junctions ideal for directed transport and photon harvesting. This Perspective outlines future developments, including the synthesis of magnetic superatoms.
Collapse
Affiliation(s)
- Shiv N Khanna
- Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284-2000, USA
| | - Arthur C Reber
- Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284-2000, USA
| | - Dinesh Bista
- Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284-2000, USA
| | - Turbasu Sengupta
- Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284-2000, USA
| | - Ryan Lambert
- Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284-2000, USA
| |
Collapse
|
28
|
Strong intrinsic room-temperature ferromagnetism in freestanding non-van der Waals ultrathin 2D crystals. Nat Commun 2021; 12:5688. [PMID: 34584104 PMCID: PMC8478980 DOI: 10.1038/s41467-021-26009-0] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2020] [Accepted: 09/14/2021] [Indexed: 11/26/2022] Open
Abstract
Control of ferromagnetism is of critical importance for a variety of proposed spintronic and topological quantum technologies. Inducing long-range ferromagnetic order in ultrathin 2D crystals will provide more functional possibility to combine their unique electronic, optical and mechanical properties to develop new multifunctional coupled applications. Recently discovered intrinsic 2D ferromagnetic crystals such as Cr2Ge2Te6, CrI3 and Fe3GeTe2 are intrinsically ferromagnetic only below room temperature, mostly far below room temperature (Curie temperature, ~20–207 K). Here we develop a scalable method to prepare freestanding non-van der Waals ultrathin 2D crystals down to mono- and few unit cells (UC) and report unexpected strong, intrinsic, ambient-air-robust, room-temperature ferromagnetism with TC up to ~367 K in freestanding non-van der Waals 2D CrTe crystals. Freestanding 2D CrTe crystals show comparable or better ferromagnetic properties to widely-used Fe, Co, Ni and BaFe12O19, promising as new platforms for room-temperature intrinsically-ferromagnetic 2D crystals and integrated 2D devices. Van der Waals crystals have recently been shown to exhibit ferromagnetism, however the Curie temperature is typically quite low. Herein, Wu et al succeed in producing mono and few layer crystals of CrTe, a non-van der Waals crystal, and demonstrate strong intrinsic room temperature ferromagnetism.
Collapse
|
29
|
Haim L, Robert F, Peres L, Lecante P, Philippot K, Poteau R, Respaud M, Amiens C. Correlation between surface chemistry and magnetism in iron nanoparticles. NANOSCALE ADVANCES 2021; 3:4471-4481. [PMID: 36133455 PMCID: PMC9419664 DOI: 10.1039/d1na00258a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Accepted: 06/22/2021] [Indexed: 06/16/2023]
Abstract
To shed light on the factors governing the stability and surface properties of iron nanoparticles, a series of iron nanoparticles has been produced by hydrogenation of two different iron amido complexes: the bis[bis(trimethylsilyl)amido] Fe(ii), [Fe(N(SiMe3)2)2]2, and the bis(diphenylamido) Fe(ii), [Fe(NPh2)2]. Nanostructured materials of bcc structure, or nanoparticles displaying average sizes below 3 nm and a polytetrahedral structure, have been obtained. Depending on the synthesis conditions, the magnetization of the nanoparticles was either significantly lower than that of bulk iron, or much higher as for clusters elaborated under high vacuum conditions. Unexpectedly, hydrogenation of aromatic groups of the ligands of the [Fe(NPh2)2] precursor has been observed in some cases. Confrontation of the experimental results with DFT calculations made on polytetrahedral Fe91 model clusters bearing hydrides, amido and/or amine ligands at their surface, has shown that amido ligands can play a key role in the stabilisation of the nanoparticles in solution while the hydride surface coverage governs their surface magnetic properties. This study indicates that magnetic measurements give valuable indicators of the surface properties of iron nanoparticles in this size range, and beyond, of their potential reactivity.
Collapse
Affiliation(s)
- Lorraine Haim
- LCC (Laboratoire de Chimie de Coordination) BP44099, 205 route de Narbonne F-31077 Toulouse Cedex 4 France
- Université de Toulouse, UPS, INPT F-31077 Toulouse Cedex 4 France
- CEMES (Centre d'Elaboration de Matériaux et d'Etudes Structurales), CNRS 29 rue J. Marvig F-31055 Toulouse France
| | - François Robert
- LCC (Laboratoire de Chimie de Coordination) BP44099, 205 route de Narbonne F-31077 Toulouse Cedex 4 France
- Université de Toulouse, UPS, INPT F-31077 Toulouse Cedex 4 France
| | - Laurent Peres
- LCC (Laboratoire de Chimie de Coordination) BP44099, 205 route de Narbonne F-31077 Toulouse Cedex 4 France
- Université de Toulouse, UPS, INPT F-31077 Toulouse Cedex 4 France
| | - Pierre Lecante
- CEMES (Centre d'Elaboration de Matériaux et d'Etudes Structurales), CNRS 29 rue J. Marvig F-31055 Toulouse France
| | - Karine Philippot
- LCC (Laboratoire de Chimie de Coordination) BP44099, 205 route de Narbonne F-31077 Toulouse Cedex 4 France
- Université de Toulouse, UPS, INPT F-31077 Toulouse Cedex 4 France
| | - Romuald Poteau
- LPCNO (Laboratoire de Physique et Chimie des Nano-Objets), UMR 5215 INSA, CNRS, UPS 135 Avenue de Rangueil F-31077 Toulouse Cedex 4 France
| | - Marc Respaud
- CEMES (Centre d'Elaboration de Matériaux et d'Etudes Structurales), CNRS 29 rue J. Marvig F-31055 Toulouse France
- LPCNO (Laboratoire de Physique et Chimie des Nano-Objets), UMR 5215 INSA, CNRS, UPS 135 Avenue de Rangueil F-31077 Toulouse Cedex 4 France
| | - Catherine Amiens
- LCC (Laboratoire de Chimie de Coordination) BP44099, 205 route de Narbonne F-31077 Toulouse Cedex 4 France
- Université de Toulouse, UPS, INPT F-31077 Toulouse Cedex 4 France
| |
Collapse
|
30
|
Jiang N, Yang B, Bai Y, Jiang Y, Zhao S. The sign reversal of anomalous Hall effect derived from the transformation of scattering effect in cluster-assembled Ni 0.8Fe 0.2 nanostructural films. NANOSCALE 2021; 13:11817-11826. [PMID: 34160537 DOI: 10.1039/d1nr02313f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Both surface and interface scattering induced a sign reversal of the anomalous Hall effect (AHE) in a few heterostructures. The sign reversal existing in a single substance can clarify the role of the surface scattering in the AHE. Here, cluster-assembled Ni0.8Fe0.2 single-substance films prepared by low-energy cluster beam deposition greatly improved the surface effect with cluster size below a characteristic size of 16.17 nm (dc) due to the high surface-to-volume ratio of the clusters and the loose structure of the films. The films presented a sign reversal of AHE and unusual transitional behavior in temperature- and size-dependent anomalous Hall resistivity with dc as the critical size. Interestingly, we also observed the sign reversal in the same film with a cluster size of dc by regulating the temperature. Based on the existing and modified scaling laws, we discovered the transformation between the bulk and surface scattering mechanisms and their coexistence, and both the sign reversal of AHE and the unusual transitional behaviors of anomalous Hall resistivity were attributed to the predominant scattering effects. Temperature- and size-dependent magnetoresistance (MR) also displayed a significant transformation at dc and further confirm the transitional mechanisms of AHE. This work provides an effective method for regulating AHE to promote its application in spintronic nano-devices.
Collapse
Affiliation(s)
- Ning Jiang
- School of Physical Science and Technology, & Inner Mongolia Key Lab of Nanoscience and Nanotechnology, Inner Mongolia University, Hohhot 010021, PR China.
| | | | | | | | | |
Collapse
|
31
|
Rivic F, Fuchs TM, Schäfer R. Discriminating the influence of thermal excitation and the presence of structural isomers on the Stark and Zeeman effect of AlSn12 clusters by combined electric and magnetic beam deflection experiments. Phys Chem Chem Phys 2021; 23:9971-9979. [DOI: 10.1039/d1cp00351h] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A combination of electric and magnetic beam deflection experiments shows a connection between non-polar and superatomic species for AlSn12 clusters.
Collapse
Affiliation(s)
- Filip Rivic
- Technische Universität Darmstadt
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie
- 64287 Darmstadt
- Germany
| | - Thomas M. Fuchs
- Technische Universität Darmstadt
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie
- 64287 Darmstadt
- Germany
| | - Rolf Schäfer
- Technische Universität Darmstadt
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie
- 64287 Darmstadt
- Germany
| |
Collapse
|
32
|
Barnes JV, Beck M, Hartweg S, Luski A, Yoder BL, Narevicius J, Narevicius E, Signorell R. Magnetic deflection of neutral sodium-doped ammonia clusters. Phys Chem Chem Phys 2021; 23:846-858. [DOI: 10.1039/d0cp04647g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new Stern–Gerlach setup elucidates the spin relaxation dynamics of small weakly-bound Na(NH3)n clusters.
Collapse
Affiliation(s)
- J. V. Barnes
- Department of Chemistry and Applied Biosciences, ETH Zürich
- Zürich
- Switzerland
| | - M. Beck
- Department of Chemistry and Applied Biosciences, ETH Zürich
- Zürich
- Switzerland
| | - S. Hartweg
- Department of Chemistry and Applied Biosciences, ETH Zürich
- Zürich
- Switzerland
| | - A. Luski
- Department of Chemical Physics, Weizmann Institute of Science
- Rehovot
- Israel
| | - B. L. Yoder
- Department of Chemistry and Applied Biosciences, ETH Zürich
- Zürich
- Switzerland
| | - J. Narevicius
- Department of Chemical Physics, Weizmann Institute of Science
- Rehovot
- Israel
| | - E. Narevicius
- Department of Chemical Physics, Weizmann Institute of Science
- Rehovot
- Israel
| | - R. Signorell
- Department of Chemistry and Applied Biosciences, ETH Zürich
- Zürich
- Switzerland
| |
Collapse
|
33
|
Ernst WE, Hauser AW. Metal clusters synthesized in helium droplets: structure and dynamics from experiment and theory. Phys Chem Chem Phys 2020; 23:7553-7574. [PMID: 33057510 DOI: 10.1039/d0cp04349d] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Metal clusters have drawn continuous interest because of their high potential for the assembly of matter with special properties that may significantly differ from the corresponding bulk. Controlled combination of particular elements in one nanoparticle can increase the options for the creation of new materials for photonic, catalytic, or electronic applications. Superfluid helium droplets provide confinement and ultralow temperature, i.e. an ideal environment for the atom-by-atom aggregation of a new nanoparticle. This perspective presents a review of the current research progress on the synthesis of tailored metal and metal oxide clusters including core-shell designs, their characterization within the helium droplet beam, deposition on various solid substrates, and analysis via surface diagnostics. Special attention is given to the thermal properties of mixed metal clusters and questions about alloy formation on the nanoscale. Experimental results are accompanied by theoretical approaches employing computational chemistry, molecular dynamics simulations and He density functional theory.
Collapse
Affiliation(s)
- Wolfgang E Ernst
- Institute of Experimental Physics, Graz University of Technology, Petersgasse 16, A-8010 Graz, Austria.
| | | |
Collapse
|
34
|
Bouzouita D, Asensio JM, Pfeifer V, Palazzolo A, Lecante P, Pieters G, Feuillastre S, Tricard S, Chaudret B. Chemoselective H/D exchange catalyzed by nickel nanoparticles stabilized by N-heterocyclic carbene ligands. NANOSCALE 2020; 12:15736-15742. [PMID: 32677658 DOI: 10.1039/d0nr04384b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
With this work, we report the synthesis and full characterization of nickel nanoparticles (NPs) stabilized by N-heterocyclic carbene (NHC) ligands, namely 1,3-bis(cyclohexyl)-1,3-dihydro-2H-imidazol-2-ylidene (ICy) and 1,3-bis(2,4,6-trimethylphenyl)-1,3-dihydro-2H-imidazol-2-ylidene (IMes). Although the resulting NPs have the same size, they display different magnetic properties and different reactivities, which result from ligand effects. In the context of H/D exchange on pharmaceutically relevant heterocycles, Ni@NHC shows a high chemoselectivity, avoiding the formation of undesired reduced side-products and enabling a variety of H/D exchange on nitrogen-containing aromatic compounds. Using 2-phenylpyridine as a model substrate, it was observed that deuteration occurred preferably at the α position of the nitrogen atom, which is the most accessible position for the C-H activation. In addition, Ni@IMes NPs are also able to fully deuterate the ortho positions of the phenyl substituents.
Collapse
Affiliation(s)
- Donia Bouzouita
- LPCNO; Université de Toulouse, INSA-CNRS-UPS, Institut National des Sciences Appliquées, 135, Avenue de Rangueil, 31077 Toulouse, France.
| | | | | | | | | | | | | | | | | |
Collapse
|
35
|
Li Z, Zhao Z. First-principles calculations on the structures, magnetic, and electronic properties of the (Fe2N)m (m = 1–4) and (Fe3N)n (n = 1–3) clusters. Struct Chem 2020. [DOI: 10.1007/s11224-020-01587-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
36
|
Gueddida S, Badawi M, Lebègue S. Grafting of iron on amorphous silica surfaces from ab initio calculations. J Chem Phys 2020; 152:214706. [DOI: 10.1063/5.0007128] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Saber Gueddida
- Univ. Lorraine, LPCT, CNRS UMR7019, F-54506 Vandoeuvre-Les-Nancy, France
| | - Michael Badawi
- Univ. Lorraine, LPCT, CNRS UMR7019, F-54506 Vandoeuvre-Les-Nancy, France
| | - Sébastien Lebègue
- Univ. Lorraine, LPCT, CNRS UMR7019, F-54506 Vandoeuvre-Les-Nancy, France
| |
Collapse
|
37
|
Farkaš B, de Leeuw NH. Towards a morphology of cobalt nanoparticles: size and strain effects. NANOTECHNOLOGY 2020; 31:195711. [PMID: 32096483 DOI: 10.1088/1361-6528/ab6fe0] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Cobalt nanoparticles with diameters of 8 nm have recently shown promising performance for biomedical applications. However, it is still unclear how the shape of cobalt clusters changes with size when reaching the nanoparticle range. In the present work, density functional theory calculations have been employed to compare the stabilities of two non-crystalline (icosahedron and decahedron) shapes, and three crystalline motifs (hcp, fcc, and bcc) for magic numbered cobalt clusters with up to 1500 atoms, based on the changes in the cohesive energies, coordination numbers, and nearest-neighbour distances arising from varying geometries. Obtained trends were extrapolated to a 104 size range, and an icosahedral shape was predicted for clusters up to 5500 atoms. Larger sized clusters adopt hcp stacking, in correspondence with the bulk phase. To explain the crystalline/non-crystalline crossovers, the contributions of the elastic strain density and twin boundary from the specimen surfaces to the cohesive energy of different motifs were evaluated. These results are expected to aid the design and synthesis of cobalt nanoparticles for applications ranging from catalysis to biomedical treatments.
Collapse
Affiliation(s)
- Barbara Farkaš
- School of Chemistry, Cardiff University, Cardiff, CF10 3AT, United Kingdom
| | | |
Collapse
|
38
|
Kooi BJ, Wuttig M. Chalcogenides by Design: Functionality through Metavalent Bonding and Confinement. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e1908302. [PMID: 32243014 DOI: 10.1002/adma.201908302] [Citation(s) in RCA: 65] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 02/03/2020] [Accepted: 02/03/2020] [Indexed: 05/27/2023]
Abstract
A unified picture of different application areas for incipient metals is presented. This unconventional material class includes several main-group chalcogenides, such as GeTe, PbTe, Sb2 Te3 , Bi2 Se3 , AgSbTe2 and Ge2 Sb2 Te5 . These compounds and related materials show a unique portfolio of physical properties. A novel map is discussed, which helps to explain these properties and separates the different fundamental bonding mechanisms (e.g., ionic, metallic, and covalent). The map also provides evidence for an unconventional, new bonding mechanism, coined metavalent bonding (MVB). Incipient metals, employing this bonding mechanism, also show a special bond breaking mechanism. MVB differs considerably from resonant bonding encountered in benzene or graphite. The concept of MVB is employed to explain the unique properties of materials utilizing it. Then, the link is made from fundamental insights to application-relevant properties, crucial for the use of these materials as thermoelectrics, phase change materials, topological insulators or as active photonic components. The close relationship of the materials' properties and their application potential provides optimization schemes for different applications. Finally, evidence will be presented that for metavalently bonded materials interesting effects arise in reduced dimensions. In particular, the consequences for the crystallization kinetics of thin films and nanoparticles will be discussed in detail.
Collapse
Affiliation(s)
- Bart J Kooi
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, Groningen, 9747 AG, the Netherlands
| | - Matthias Wuttig
- Institute of Physics IA, RWTH Aachen University, Aachen, 52074, Germany
- JARA-Institute: Energy-Efficient Information Technology (Green IT), Forschungszentrum Jülich GmbH, Jülich, 52428, Germany
| |
Collapse
|
39
|
Yuan J, Chen Y, Xie Y, Zhang X, Rao D, Guo Y, Yan X, Feng YP, Cai Y. Squeezed metallic droplet with tunable Kubo gap and charge injection in transition metal dichalcogenides. Proc Natl Acad Sci U S A 2020; 117:6362-6369. [PMID: 32161125 PMCID: PMC7104306 DOI: 10.1073/pnas.1920036117] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Shrinking the size of a bulk metal into nanoscale leads to the discreteness of electronic energy levels, the so-called Kubo gap δ. Renormalization of the electronic properties with a tunable and size-dependent δ renders fascinating photon emission and electron tunneling. In contrast with usual three-dimensional (3D) metal clusters, here we demonstrate that Kubo gap δ can be achieved with a two-dimensional (2D) metallic transition metal dichalcogenide (i.e., 1T'-phase MoTe2) nanocluster embedded in a semiconducting polymorph (i.e., 1H-phase MoTe2). Such a 1T'/1H MoTe2 nanodomain resembles a 3D metallic droplet squeezed in a 2D space which shows a strong polarization catastrophe while simultaneously maintaining its bond integrity, which is absent in traditional δ-gapped 3D clusters. The weak screening of the host 2D MoTe2 leads to photon emission of such pseudometallic systems and a ballistic injection of carriers in the 1T'/1H/1T' homojunctions which may find applications in sensors and 2D reconfigurable devices.
Collapse
Affiliation(s)
- Jiaren Yuan
- College of Science, Jiangsu University, 212013 Zhenjiang, China
- School of Material Science and Engineering, Jiangsu University, 212013 Zhenjiang, China
- Department of Physics, National University of Singapore, 117551 Singapore
| | - Yuanping Chen
- College of Science, Jiangsu University, 212013 Zhenjiang, China
| | - Yuee Xie
- College of Science, Jiangsu University, 212013 Zhenjiang, China
| | - Xiaoyu Zhang
- School of Material Science and Engineering, Jiangsu University, 212013 Zhenjiang, China
| | - Dewei Rao
- School of Material Science and Engineering, Jiangsu University, 212013 Zhenjiang, China
| | - Yandong Guo
- College of Electronic Science and Engineering, Nanjing University of Posts and Telecommunications, 210046 Nanjing, China
| | - Xiaohong Yan
- College of Science, Jiangsu University, 212013 Zhenjiang, China;
- School of Material Science and Engineering, Jiangsu University, 212013 Zhenjiang, China
| | - Yuan Ping Feng
- Department of Physics, National University of Singapore, 117551 Singapore;
- Centre for Advanced Two-Dimensional Materials, National University of Singapore, 117551 Singapore
| | - Yongqing Cai
- Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Taipa, Macau, China
| |
Collapse
|
40
|
Pardo A, Yáñez S, Piñeiro Y, Iglesias-Rey R, Al-Modlej A, Barbosa S, Rivas J, Taboada P. Cubic Anisotropic Co- and Zn-Substituted Ferrite Nanoparticles as Multimodal Magnetic Agents. ACS APPLIED MATERIALS & INTERFACES 2020; 12:9017-9031. [PMID: 31999088 DOI: 10.1021/acsami.9b20496] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The use of magnetic nanoparticles as theranostic agents for the detection and treatment of cancer diseases has been extensively analyzed in the last few years. In this work, cubic-shaped cobalt and zinc-doped iron oxide nanoparticles with edge lengths in the range from 28 to 94 nm are proposed as negative contrast agents for magnetic resonance imaging and to generate localized heat by magnetic hyperthermia, obtaining high values of transverse relaxation coefficients and specific adsorption rates. The applied magnetic fields presented suitable characteristics for the potential validation of the results into the clinical practice in all cases. Pure iron oxide and cobalt- and zinc-substituted ferrites have been structurally and magnetically characterized, observing magnetite as the predominant phase and weak ferrimagnetic behavior at room temperature, with saturation values even larger than those of bulk magnetite. The coercive force increased due to the incorporation of cobalt ions, while zinc substitution promotes a significant increase in saturation magnetization. After their transfer to aqueous solution, those particles showing the best properties were chosen for evaluation in in vitro cell models, exhibiting high critical cytotoxic concentrations and high internalization degrees in several cell lines. The magnetic behavior of the nanocubes after their successful cell internalization was analyzed, detecting negligible variations on their magnetic hysteresis loops and a significant decrease in the specific adsorption rate values.
Collapse
Affiliation(s)
- Alberto Pardo
- Colloids and Polymers Physics Group, Physics of Condensed Matter Area , University of Santiago de Compostela , Santiago de Compostela 15782 , Spain
- Health Research Institute of Santiago de Compostela , University of Santiago de Compostela , Santiago de Compostela 15782 , Spain
| | - Susana Yáñez
- Magnetism and Nanotechnology Group, Department of Applied Physics , University of Santiago de Compostela , Santiago de Compostela 15782 , Spain
| | - Yolanda Piñeiro
- Magnetism and Nanotechnology Group, Department of Applied Physics , University of Santiago de Compostela , Santiago de Compostela 15782 , Spain
| | - Ramón Iglesias-Rey
- Clinical Neurosciences Research Laboratory, Clinical University Hospital , Health Research Institute of Santiago de Compostela (IDIS) , Santiago de Compostela 15782 , Spain
| | - Abeer Al-Modlej
- Department of Physics and Astronomy, College of Science , King Saud University , Riyadh 11451 , Saudi Arabia
| | - Silvia Barbosa
- Colloids and Polymers Physics Group, Physics of Condensed Matter Area , University of Santiago de Compostela , Santiago de Compostela 15782 , Spain
- Health Research Institute of Santiago de Compostela , University of Santiago de Compostela , Santiago de Compostela 15782 , Spain
| | - José Rivas
- Magnetism and Nanotechnology Group, Department of Applied Physics , University of Santiago de Compostela , Santiago de Compostela 15782 , Spain
| | - Pablo Taboada
- Colloids and Polymers Physics Group, Physics of Condensed Matter Area , University of Santiago de Compostela , Santiago de Compostela 15782 , Spain
- Health Research Institute of Santiago de Compostela , University of Santiago de Compostela , Santiago de Compostela 15782 , Spain
| |
Collapse
|
41
|
Kumari P, Majumder S, Rani S, Nair AK, Kumari K, Kamalakar MV, Ray SJ. High efficiency spin filtering in magnetic phosphorene. Phys Chem Chem Phys 2020; 22:5893-5901. [DOI: 10.1039/c9cp05390e] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
We present high efficiency spin filtering behaviour in magnetically rendered phosphorene, doped with various 3d block elements. A phase diagram was obtained depicting the presence of various electronic and magnetic states.
Collapse
Affiliation(s)
- P. Kumari
- Department of Physics
- Indian Institute of Technology Patna
- Bihta 801106
- India
| | - S. Majumder
- Department of Physics
- Indian Institute of Technology Patna
- Bihta 801106
- India
| | - S. Rani
- Department of Physics
- Indian Institute of Technology Patna
- Bihta 801106
- India
| | - A. K. Nair
- Department of Physics
- Indian Institute of Technology Patna
- Bihta 801106
- India
| | - K. Kumari
- Department of Physics
- Indian Institute of Technology Patna
- Bihta 801106
- India
| | | | - S. J. Ray
- Department of Physics
- Indian Institute of Technology Patna
- Bihta 801106
- India
| |
Collapse
|
42
|
de Amorim RV, Batista KEA, Nagurniak GR, Orenha RP, Parreira RLT, Piotrowski MJ. CO, NO, and SO adsorption on Ni nanoclusters: a DFT investigation. Dalton Trans 2020; 49:6407-6417. [PMID: 32352455 DOI: 10.1039/d0dt00288g] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Nickel nanoclusters are very promising for catalysis-related applications, especially involving chemical reactions with polluting molecules, such as carbon, nitrogen, and sulfur monoxides, which are directly or indirectly involved in serious environmental pollution problems. Therefore, it is of utmost importance to improve the understanding of the interaction between Ni nanoclusters and diatomic molecules, such as CO, NO, and SO, to provide insights into real subnano catalysts. Thus, here, we report an ab initio investigation based on density functional theory calculations within van der Waals D3 corrections to investigate the adsorption properties of CO, NO, and SO on Ni nanoclusters. From energetic and electronic criteria applied to Nin nanoclusters (n = 2-15), we selected Ni6 (octahedron) and Ni10 (triangular pyramid) nanoclusters as supports. According to our analyses, the molecular adsorption increases the stability of Ni nanoclusters, especially for Ni6 systems. The interaction intensity is larger for SO than for NO and CO in adsorbed systems, and the strong OS-Ni interaction is responsible for the well-known sulfur poisoning on transition-metal systems. The lowest energy adsorption sites are onefold for CO/Ni6, NO/Ni6, and CO/Ni10; twofold for NO/Ni10; and threefold for SO/Ni6 and CO/Ni10, where CO and NO molecules sustain linear and perpendicular geometries, while SO geometry changes to a bent configuration resulting from a sideways adsorption. The equilibrium bond lengths of the molecules expand upon adsorption, from 0.9% (NO/Ni6/10) to 11.3% (SO/Ni6/10), consequently, the internal molecular bond strengths decrease, since there is a reduction in the molecular stretching frequencies. This result occurs most strongly for SO followed by NO and CO systems, which was confirmed by an estimation of the energetic contribution of the distortion after the adsorption process. Thus, the strong S-Ni interaction, given by SO chemisorption on hollow sites with a sideways interaction, implies an energetic decrease and, consequently, a part of the energy gained from the SO-Ni interaction is from the SO and nanocluster distortions. Ultimately, using the energy decomposition analysis (from SAPT0) for XO/Ni6 systems, we improved the understanding of the CO and NO (SO) singlet (doublet) spin multiplicities' interaction with Ni6 nanoclusters.
Collapse
Affiliation(s)
- Rairisson V de Amorim
- Department of Physics, Federal University of Pelotas, PO Box 354, 96010-900, Pelotas, RS, Brazil
| | - Krys E A Batista
- Department of Physics, Federal University of Pelotas, PO Box 354, 96010-900, Pelotas, RS, Brazil
| | - Glaucio R Nagurniak
- Department of Exact Sciences and Education, Federal University of Santa Catarina, 89036-004, Blumenau, SC, Brazil
| | - Renato P Orenha
- Núcleo de Pesquisas em Ciências Exatas e Tecnológicas, Universidade de Franca, Franca, SP, Brazil
| | - Renato L T Parreira
- Núcleo de Pesquisas em Ciências Exatas e Tecnológicas, Universidade de Franca, Franca, SP, Brazil
| | - Maurício J Piotrowski
- Department of Physics, Federal University of Pelotas, PO Box 354, 96010-900, Pelotas, RS, Brazil.
| |
Collapse
|
43
|
López-Vinasco AM, Martínez-Prieto LM, Asensio JM, Lecante P, Chaudret B, Cámpora J, van Leeuwen PWNM. Novel nickel nanoparticles stabilized by imidazolium-amidinate ligands for selective hydrogenation of alkynes. Catal Sci Technol 2020. [DOI: 10.1039/c9cy02172h] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Novel magnetically recoverable nickel nanoparticles (Ni NPs) stabilized by imidazolium-amidinate ligands selectively hydrogenate alkynes into (Z)-alkenes under mild conditions.
Collapse
Affiliation(s)
- Angela M. López-Vinasco
- LPCNO; Laboratoire de Physique et Chimie des Nano-Objets
- UMR5215 INSA-CNRS-UPS
- Institut National des Sciences Appliquées-Toulouse
- F-31077 Toulouse
- France
| | - Luis M. Martínez-Prieto
- LPCNO; Laboratoire de Physique et Chimie des Nano-Objets
- UMR5215 INSA-CNRS-UPS
- Institut National des Sciences Appliquées-Toulouse
- F-31077 Toulouse
- France
| | - Juan M. Asensio
- LPCNO; Laboratoire de Physique et Chimie des Nano-Objets
- UMR5215 INSA-CNRS-UPS
- Institut National des Sciences Appliquées-Toulouse
- F-31077 Toulouse
- France
| | - Pierre Lecante
- CEMES (Centre d'Elaboration de Matériaux et d'Etudes Structurales)
- CNRS
- F-31055 Toulouse
- France
| | - Bruno Chaudret
- LPCNO; Laboratoire de Physique et Chimie des Nano-Objets
- UMR5215 INSA-CNRS-UPS
- Institut National des Sciences Appliquées-Toulouse
- F-31077 Toulouse
- France
| | - Juan Cámpora
- IIQ, Instituto de Investigaciones Químicas
- CSIC-Universidad de Sevilla
- 41092 Sevilla
- Spain
| | - Piet W. N. M. van Leeuwen
- LPCNO; Laboratoire de Physique et Chimie des Nano-Objets
- UMR5215 INSA-CNRS-UPS
- Institut National des Sciences Appliquées-Toulouse
- F-31077 Toulouse
- France
| |
Collapse
|
44
|
Gonzalez MI, Turkiewicz AB, Darago LE, Oktawiec J, Bustillo K, Grandjean F, Long GJ, Long JR. Confinement of atomically defined metal halide sheets in a metal-organic framework. Nature 2019; 577:64-68. [PMID: 31739311 DOI: 10.1038/s41586-019-1776-0] [Citation(s) in RCA: 60] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Accepted: 09/26/2019] [Indexed: 11/09/2022]
Abstract
The size-dependent and shape-dependent characteristics that distinguish nanoscale materials from bulk solids arise from constraining the dimensionality of an inorganic structure1-3. As a consequence, many studies have focused on rationally shaping these materials to influence and enhance their optical, electronic, magnetic and catalytic properties4-6. Although a select number of stable clusters can typically be synthesized within the nanoscale regime for a specific composition, isolating clusters of a predetermined size and shape remains a challenge, especially for those derived from two-dimensional materials. Here we realize a multidentate coordination environment in a metal-organic framework to stabilize discrete inorganic clusters within a porous crystalline support. We show confined growth of atomically defined nickel(II) bromide, nickel(II) chloride, cobalt(II) chloride and iron(II) chloride sheets through the peripheral coordination of six chelating bipyridine linkers. Notably, confinement within the framework defines the structure and composition of these sheets and facilitates their precise characterization by crystallography. Each metal(II) halide sheet represents a fragment excised from a single layer of the bulk solid structure, and structures obtained at different precursor loadings enable observation of successive stages of sheet assembly. Finally, the isolated sheets exhibit magnetic behaviours distinct from those of the bulk metal halides, including the isolation of ferromagnetically coupled large-spin ground states through the elimination of long-range, interlayer magnetic ordering. Overall, these results demonstrate that the pore environment of a metal-organic framework can be designed to afford precise control over the size, structure and spatial arrangement of inorganic clusters.
Collapse
Affiliation(s)
- Miguel I Gonzalez
- Department of Chemistry, University of California, Berkeley, CA, USA
| | - Ari B Turkiewicz
- Department of Chemistry, University of California, Berkeley, CA, USA
| | - Lucy E Darago
- Department of Chemistry, University of California, Berkeley, CA, USA
| | - Julia Oktawiec
- Department of Chemistry, University of California, Berkeley, CA, USA
| | - Karen Bustillo
- National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Fernande Grandjean
- Department of Chemistry, Missouri University of Science and Technology, University of Missouri, Rolla, MO, USA
| | - Gary J Long
- Department of Chemistry, Missouri University of Science and Technology, University of Missouri, Rolla, MO, USA
| | - Jeffrey R Long
- Department of Chemistry, University of California, Berkeley, CA, USA. .,Department of Chemical and Biomolecular Engineering, University of California, Berkeley, CA, USA. .,Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.
| |
Collapse
|
45
|
Getzlaff M, Leifels M, Weber P, Kökcam-Demir Ü, Janiak C. Nanoparticles in toner material. SN APPLIED SCIENCES 2019. [DOI: 10.1007/s42452-019-0501-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
|
46
|
Ghosh D, Singha DK, Lebedev OI, Seikh MM, Mahata P. A remarkable annealing time effect on the magnetic properties of single-source coordination polymer precursor-derived CoFe 2O 4 nanoparticles. NEW J CHEM 2019. [DOI: 10.1039/c9nj04550c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The diversity in the magnetocrystalline anisotropy of nano-sized CoFe2O4 samples has been derived from coordination polymers through differential occupancy of Co2+ in octahedral sites.
Collapse
Affiliation(s)
- Debamalya Ghosh
- Department of Chemistry
- Jadavpur University
- Kolkata 700032
- India
- Department of Chemistry
| | - Debal Kanti Singha
- Department of Chemistry
- Jadavpur University
- Kolkata 700032
- India
- Department of Chemistry
| | | | - Md. Motin Seikh
- Department of Chemistry
- Visva-Bharati University
- Santiniketan
- India
| | - Partha Mahata
- Department of Chemistry
- Jadavpur University
- Kolkata 700032
- India
| |
Collapse
|
47
|
Bakker JM, Jalink J, Dieleman D, Kirilyuk A. Structural determination of neutral Co n clusters (n = 4-10,13) through IR-UV two-color vibrational spectroscopy and DFT calculations. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:494003. [PMID: 30451159 DOI: 10.1088/1361-648x/aaebf3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We recorded IR spectra for neutral cobalt clusters via two-color IR-UV ionization, using the Free Electron Laser for intracavity experiments (FELICE). Well-resolved IR spectra are presented for [Formula: see text] (n = 4-10, 13) and analyzed with the help of Density Functional Theory calculations using two different correlation exchange functionals: the revisited Tao-Perdew-Staroverov-Scuseria (revTPSS) and the frequently used Perdew-Burke-Ernzerhof (PBE) approaches. Although we have not performed an extensive structure search, we tentatively assign the spectra for all cluster sizes except for n = 7, and n = 10. We find that neither of the two functionals chosen clearly outperforms the other in predicting IR spectra, and that relatively low scaling factors of 0.82 (PBE) and 0.8 (revTPSS) are required. In contrast to the magnetic moments, the calculated electric dipole moments fluctuate strongly as a function of cluster size and could therefore be used as an indirect probe to the cluster structure.
Collapse
Affiliation(s)
- J M Bakker
- Radboud University, Institute for Molecules and Materials, FELIX Laboratory, Toernooiveld 7c, 6525 ED Nijmegen, Netherlands
| | | | | | | |
Collapse
|
48
|
Jia M, van der Tol J, Li Y, Chernyy V, Bakker JM, Pham LN, Nguyen MT, Janssens E. Structures and magnetic properties of small [Formula: see text] and Co n-1Cr + (n = 3-5) clusters. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:474002. [PMID: 30403192 DOI: 10.1088/1361-648x/aae7b3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Small cobalt clusters [Formula: see text] and their single chromium atom doped counterparts Co n-1Cr+ (n = 3-5) were studied mass spectrometrically by measuring the infrared multiple photon dissociation (IRMPD) spectra of the corresponding argon tagged complexes. The geometric and electronic structures of the [Formula: see text] and Co n-1Cr+ (n = 3-5) clusters as well as their Ar complexes were optimized by density functional theory (DFT) calculations. The obtained lowest energy structures were confirmed by comparing the IRMPD spectra of [Formula: see text] and [Formula: see text] (n = 3-5, m = 3 and 4) with the corresponding calculated IR spectra. The calculations reveal that the doped Co n-1Cr+ clusters retain the geometric structures of the most stable [Formula: see text] clusters. However, the coupling of the local magnetic moments within the clusters is altered in a size-dependent way: the Cr atom is ferromagnetically coupled in Co2Cr+ and Co3Cr+, while it is antiferromagnetically coupled in Co4Cr+.
Collapse
Affiliation(s)
- Meiye Jia
- Laboratory of Solid State Physics and Magnetism, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
| | | | | | | | | | | | | | | |
Collapse
|
49
|
Zamudio-Bayer V, Hirsch K, Langenberg A, Ławicki A, Terasaki A, von Issendorff B, Lau JT. Large orbital magnetic moments of small, free cobalt cluster ions Co[Formula: see text] with n [Formula: see text]. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:464002. [PMID: 30270848 DOI: 10.1088/1361-648x/aae54a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The size dependent electronic structure and separate spin and orbital magnetic moments of free Co[Formula: see text] ([Formula: see text]) cluster ions have been investigated by x-ray absorption and x-ray magnetic circular dichroism spectroscopy in a cryogenic ion trap. A very large orbital magnetic moment of [Formula: see text] per atom was determined for Co[Formula: see text], which is one order of magnitude larger than in the bulk metal. Large orbital magnetic moments per atom of ≈1 [Formula: see text] were also found for Co[Formula: see text], Co[Formula: see text], and Co[Formula: see text]. The orbital contribution to the total magnetic moment shows a non-monotonic cluster size dependence: The orbital contribution increases from a local minimum at n = 2 to a local maximum at n = 5 and then decreases with increasing cluster size. The 3d spin magnetic moment per atom is nearly constant and is solely defined by the number of 3d holes which shows that the 3d majority spin states are fully occupied, that is, 3d hole spin polarization is 100%.
Collapse
Affiliation(s)
- V Zamudio-Bayer
- Abteilung für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, 12489 Berlin, Germany. Institut für Methoden und Instrumentierung der Forschung mit Synchrotronstrahlung, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, 12489 Berlin, Germany. Physikalisches Institut, Universität Freiburg, Hermann-Herder-Straße 3, 79104 Freiburg, Germany
| | | | | | | | | | | | | |
Collapse
|
50
|
Li Z, Zhuang Z, Lv F, Zhu H, Zhou L, Luo M, Zhu J, Lang Z, Feng S, Chen W, Mai L, Guo S. The Marriage of the FeN 4 Moiety and MXene Boosts Oxygen Reduction Catalysis: Fe 3d Electron Delocalization Matters. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1803220. [PMID: 30260517 DOI: 10.1002/adma.201803220] [Citation(s) in RCA: 138] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Revised: 07/17/2018] [Indexed: 05/22/2023]
Abstract
Iron-nitrogen-carbon (Fe-N-C) is hitherto considered as one of the most satisfactory alternatives to platinum for the oxygen reduction reaction (ORR). Major efforts currently are devoted to the identification and maximization of carbon-enclosed FeN4 moieties, which act as catalytically active centers. However, fine-tuning of their intrinsic ORR activity remains a huge challenge. Herein, a twofold activity improvement of pristine Fe-N-C through introducing Ti3 C2 Tx MXene as a support is realized. A series of spectroscopy and magnetic measurements reveal that the marriage of FeN4 moiety and MXene can induce remarkable Fe 3d electron delocalization and spin-state transition of Fe(II) ions. The lower local electron density and higher spin state of the Fe(II) centers greatly favor the Fe d z 2 electron transfer, and lead to an easier oxygen adsorption and reduction on active FeN4 sites, and thus an enhanced ORR activity. The optimized catalyst shows a two- and fivefold higher specific ORR activity than those of pristine catalyst and Pt/C, respectively, even exceeding most Fe-N-C catalysts ever reported. This work opens up a new pathway in the rational design of Fe-N-C catalysts, and reflects the critical influence of Fe 3d electron states in FeN4 moiety supported on MXene in ORR catalysis.
Collapse
Affiliation(s)
- Zilan Li
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Zechao Zhuang
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Fan Lv
- Department of Materials Science and Engineering, and BIC-ESAT, College of Engineering, Peking University, Beijing, 100871, P. R. China
| | - Han Zhu
- School of Chemical and Material Engineering, Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, Jiangnan University, Wuxi, 214122, P. R. China
| | - Liang Zhou
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Mingchuan Luo
- Department of Materials Science and Engineering, and BIC-ESAT, College of Engineering, Peking University, Beijing, 100871, P. R. China
| | - Jiexin Zhu
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Zhiquan Lang
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Shihao Feng
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Wei Chen
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Liqiang Mai
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, P. R. China
| | - Shaojun Guo
- Department of Materials Science and Engineering, and BIC-ESAT, College of Engineering, Peking University, Beijing, 100871, P. R. China
| |
Collapse
|