1
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Jia K, Dong XJ, Li SS, Ji WX, Zhang CW. Tunable abundant valley Hall effect and chiral spin-valley locking in Janus monolayer VCGeN 4. NANOSCALE 2024; 16:8639-8649. [PMID: 38618905 DOI: 10.1039/d3nr05643k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/16/2024]
Abstract
It is both conceptually and practically fascinating to explore fundamental research studies and practical applications of two-dimensional systems with the tunable abundant valley Hall effect. In this work, based on first-principles calculations, the tunable abundant valley Hall effect is proved to appear in Janus monolayer VCGeN4. When the magnetization is along the out-of-plane direction, VCGeN4 is an intrinsic ferromagnetic semiconductor with a valley feature. The intriguing spontaneous valley polarization exists in VCGeN4 due to the common influence of broken inversion and time-reversal symmetries, which makes it easier to realize the anomalous valley Hall effect. Furthermore, we observe that the valley-non-equilibrium quantum anomalous Hall effect is driven by external strain, which is located between two half-valley-metal states. When reversing the magnetization, the spin flipping makes the position of the edge state to change from one valley to another valley, demonstrating an intriguing behavior known as chiral spin-valley locking. Although the easy magnetic axis orientation is along the in-plane direction, we can utilize an external magnetic field to transform the magnetic axis orientation. Moreover, it is found that the valley state, electronic and magnetic properties can be well regulated by the electric field. Our works explore the mechanism of the tunable abundant valley Hall effect by applying an external strain and electric field, which provides a perfect platform to investigate the spin, valley, and topology.
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Affiliation(s)
- Kang Jia
- School of Physics and Technology, Institute of Spintronics, University of Jinan, Jinan, Shandong, 250022, People's Republic of China.
- School of Physics and Physical Engineering, Qufu Normal University, Qufu, Shandong, 273100, People's Republic of China
| | - Xiao-Jing Dong
- School of Physics and Physical Engineering, Qufu Normal University, Qufu, Shandong, 273100, People's Republic of China
| | - Sheng-Shi Li
- School of Physics and Technology, Institute of Spintronics, University of Jinan, Jinan, Shandong, 250022, People's Republic of China.
| | - Wei-Xiao Ji
- School of Physics and Technology, Institute of Spintronics, University of Jinan, Jinan, Shandong, 250022, People's Republic of China.
| | - Chang-Wen Zhang
- School of Physics and Technology, Institute of Spintronics, University of Jinan, Jinan, Shandong, 250022, People's Republic of China.
- School of Physics and Physical Engineering, Qufu Normal University, Qufu, Shandong, 273100, People's Republic of China
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2
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Wu J, Guo R, Wu D, Li X, Wu X. Turning Nonmagnetic Two-Dimensional Molybdenum Disulfides into Room-Temperature Ferromagnets by the Synergistic Effect of Lattice Stretching and Charge Injection. J Phys Chem Lett 2024; 15:2293-2300. [PMID: 38386013 DOI: 10.1021/acs.jpclett.3c03478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2024]
Abstract
Exploring two-dimensional (2D) room-temperature magnetic materials in the field of 2D spintronics remains a formidable challenge. The vast array of nonmagnetic 2D materials provides abundant resources for exploration, but the strategy to convert them into intrinsic room-temperature magnets remains elusive. To address this challenge, we present a general strategy based on surface halogenation for the transition from nonmagnetism to intrinsic room-temperature ferromagnetism in 2D MoS2 based on first-principles calculations. The derived 2D halogenated MoS2 are half-semimetals with a high Curie temperature (TC) of 430-589 K and excellent stability. In-depth mechanistic studies revealed that this marvelous nonmagnetism-to-ferromagnetism transition originates from the modulation of the splitting as well as the occupation of the Mo d orbitals by the synergy of lattice stretching and charge injection induced by the surface halogenation. This work establishes a promising route for exploring 2D room-temperature magnetic materials from the abundant pool of 2D nonmagnetic counterparts.
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Affiliation(s)
- Jing Wu
- School of Physics and Technology, Center for Quantum Transport and Thermal Energy Science, Nanjing Normal University, Nanjing 210023, China
- Yancheng Kangju Road Junior Middle School, Yancheng 224000, China
| | - Ruyi Guo
- School of Physics and Technology, Center for Quantum Transport and Thermal Energy Science, Nanjing Normal University, Nanjing 210023, China
| | - Daoxiong Wu
- School of Marine Science and Engineering, Hainan Provincial Key Lab of Fine Chemistry, School of Chemical Engineering and Technology, Hainan University, Haikou 570228, China
| | - Xiuling Li
- School of Physics and Technology, Center for Quantum Transport and Thermal Energy Science, Nanjing Normal University, Nanjing 210023, China
- National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
| | - Xiaojun Wu
- Hefei National Research Center for Physical Sciences at the Microscale, Collaborative Innovation Center of Chemistry for Energy Materials, CAS Key Laboratory of Materials for Energy Conversion, CAS Center for Excellence in Nanoscience, and School of Chemistry and Materials Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China
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3
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Jia K, Dong XJ, Li SS, Ji WX, Zhang CW. Novel valley character and tunable quasi-half-valley metal state in Janus monolayer VSiGeP 4. Phys Chem Chem Phys 2024; 26:4683-4691. [PMID: 38251932 DOI: 10.1039/d3cp05636h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2024]
Abstract
The manipulation and regulation of valley characteristics have aroused widespread interest in emerging information fields and fundamental research. Realizing valley polarization is one crucial issue for spintronic and valleytronic applications, the concepts of a half-valley metal (HVM) and ferrovalley (FV) materials have been put forward. Then, to separate electron and hole carriers, a fresh concept of a quasi-HVM (QHVM) has been proposed, in which only one type of carrier is valley polarized for electron and hole carriers. Based on first-principles calculations, we demonstrate that the Janus monolayer VSiGeP4 has QHVM character. To well regulate the QHVM state, strain engineering is utilized to adjust the electronic and valley traits of monolayer VSiGeP4. In the discussed strain range, monolayer VSiGeP4 always favors the ferromagnetic ground state and out-of-plane magnetization, which ensures the appearance of spontaneous valley polarization. It is found that the QHVM state can be induced in different electronic correlations (U), and the strain can effectively tune the valley, magnetic, and electronic features to maintain the QHVM state under various U values. Our work opens up a new research idea in the design of multifunctional spintronic and valleytronic devices.
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Affiliation(s)
- Kang Jia
- School of Physics and Physical Engineering, Qufu Normal University, Qufu, Shandong, 273100, People's Republic of China.
| | - Xiao-Jing Dong
- School of Physics and Physical Engineering, Qufu Normal University, Qufu, Shandong, 273100, People's Republic of China.
| | - Sheng-Shi Li
- School of Physics and Technology, Institute of Spintronics, University of Jinan, Jinan, Shandong, 250022, People's Republic of China
| | - Wei-Xiao Ji
- School of Physics and Technology, Institute of Spintronics, University of Jinan, Jinan, Shandong, 250022, People's Republic of China
| | - Chang-Wen Zhang
- School of Physics and Physical Engineering, Qufu Normal University, Qufu, Shandong, 273100, People's Republic of China.
- School of Physics and Technology, Institute of Spintronics, University of Jinan, Jinan, Shandong, 250022, People's Republic of China
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4
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Wang MH, Kalita AJ, Orozco-Ic M, Yan GR, Chen C, Yan B, Castillo-Toraya G, Tiznado W, Guha AK, Pan S, Merino G, Cui ZH. Planar pentacoordinate s-block metals. Chem Sci 2023; 14:8785-8791. [PMID: 37621437 PMCID: PMC10445469 DOI: 10.1039/d2sc05939h] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Accepted: 07/14/2023] [Indexed: 08/26/2023] Open
Abstract
The presence of a delocalized π-bond is often considered an essential criterion for achieving planar hypercoordination. Herein, we show that σ-delocalization could be sufficient to make the planar configuration the most stable isomer in a series of planar pentacoordinate s-block metals. High-level ab initio computations reveal that the global minimum of a series of interalkali and interalkali-alkaline earth clusters (LiNa5, Li5Mg+, Na5Mg+, K5Ca+, CaRb5+, Rb5Sr+, and SrCs5+) adopts a singlet D5h structure with a planar pentacoordinate lithium or alkaline earth metal (AE = Mg, Ca, Sr). These clusters are unusual combinations to stabilize a planar pentacoordinate atom, as all their constituents are electropositive. Despite the absence of π-electrons, Hückel's rule is fulfilled by the six σ-electrons. Furthermore, the systems exhibit a diatropic ring current in response to an external magnetic field and a strong magnetic shielding, so they might be classified as σ-aromatic. Therefore, multicenter σ-bonds and the resulting σ-delocalization stabilize these clusters, even though they lack π-aromaticity.
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Affiliation(s)
- Meng-Hui Wang
- Institute of Atomic and Molecular Physics, Jilin University Changchun 130023 China
| | - Amlan J Kalita
- Advanced Computational Chemistry Centre, Department of Chemistry, Cotton University Panbazar Guwahati Assam 781001 India
| | - Mesías Orozco-Ic
- Donostia International Physics Center (DIPC) 20018 Donostia Euskadi Spain
| | - Gai-Ru Yan
- Institute of Atomic and Molecular Physics, Jilin University Changchun 130023 China
| | - Chen Chen
- Institute of Atomic and Molecular Physics, Jilin University Changchun 130023 China
| | - Bing Yan
- Institute of Atomic and Molecular Physics, Jilin University Changchun 130023 China
| | - Gabriela Castillo-Toraya
- Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados Unidad Mérida. Km 6 Antigua Carretera a Progreso. Apdo. Postal 73, Cordemex 97310 Mérida Yucatan Mexico
| | - William Tiznado
- Centro de Química Teórica & Computacional (CQT&C), Departamento de Ciencias Químicas, Facultad de Ciencias Exactas, Universidad Andres Bello Avenida República 275 Santiago Chile
| | - Ankur K Guha
- Advanced Computational Chemistry Centre, Department of Chemistry, Cotton University Panbazar Guwahati Assam 781001 India
| | - Sudip Pan
- Institute of Atomic and Molecular Physics, Jilin University Changchun 130023 China
| | - Gabriel Merino
- Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados Unidad Mérida. Km 6 Antigua Carretera a Progreso. Apdo. Postal 73, Cordemex 97310 Mérida Yucatan Mexico
| | - Zhong-Hua Cui
- Institute of Atomic and Molecular Physics, Jilin University Changchun 130023 China
- Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), Jilin University Changchun 130023 China
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5
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Wang H, Yin XZ, Liu Y, Li YP, Ni MY, Jiao N, Lu HY, Zhang P. Hydrogenation induced high-temperature superconductivity in two-dimensional W 2C 3. Phys Chem Chem Phys 2023; 25:22171-22178. [PMID: 37565262 DOI: 10.1039/d3cp02316h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/12/2023]
Abstract
The discovery of highly crystalline two-dimensional (2D) superconductors provides a new alluring branch for exploring the fundamental significances. Based on first-principles calculations, we predict a new kind of 2D stable material W2C3, which is a semimetal but not a superconductor because of the weak electron-phonon coupling (EPC) strength. After hydrogenation, W2C3H2 possesses the intrinsic metallic properties with a large density of states (DOS) at the Fermi energy (EF). More interestingly, the EPC strength is greatly enhanced after hydrogenation and the calculated critical temperature (Tc) is 40.5 K. Furthermore, the compressive strain can obviously soften the low-frequency phonons and enhance the EPC strength. Then, the Tc of W2C3H2 can be increased from 40.5 K to 49.1 K with -4% compressive strain. This work paves the way for providing a new platform for 2D superconductivity.
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Affiliation(s)
- Hao Wang
- School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China.
| | - Xin-Zhu Yin
- School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China.
| | - Yang Liu
- School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China.
| | - Ya-Ping Li
- School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China.
| | - Mei-Yan Ni
- School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China.
| | - Na Jiao
- School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China.
| | - Hong-Yan Lu
- School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China.
| | - Ping Zhang
- School of Physics and Physical Engineering, Qufu Normal University, Qufu 273165, China.
- Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
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6
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Niu Y, Zhang K, Cui X, Wu X, Yang J. Two-Dimensional Iron Silicide (FeSi x) Alloys with Above-Room-Temperature Ferromagnetism. NANO LETTERS 2023; 23:2332-2338. [PMID: 36897107 DOI: 10.1021/acs.nanolett.3c00113] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Two-dimensional (2D) materials with intrinsic room-temperature ferromagnetism have gathered tremendous interest as promising candidates for next-generation spintronics. Here, on the basis of first-principles calculations, we report a family of stable 2D iron silicide (FeSix) alloys via dimensional reduction of their bulk counterparts. Our results demonstrate that 2D Fe4Si2-hex, Fe4Si2-orth, Fe3Si2, and FeSi2 nanosheets are lattice-dynamically and thermally stable, confirmed by the calculated phonon spectra and Born-Oppenheimer dynamic simulation up to 1000 K. 2D FeSix nanosheets are ferromagnetic metals with estimated Curie temperatures ranging from 547 to 971 K due to strong direct exchange interaction between Fe sites. In addition, the electronic properties of 2D FeSix alloys can be maintained on silicon substrates, providing an ideal platform for spintronics applications in the nanoscale.
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Affiliation(s)
- Yijie Niu
- CAS Key Laboratory for Materials for Energy Conversion, School of Chemistry and Materials Science, CAS Center for Excellence in Nanoscience and Synergetic Innovation of Quantum Information & Quantum Technology, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Kai Zhang
- CAS Key Laboratory for Materials for Energy Conversion, School of Chemistry and Materials Science, CAS Center for Excellence in Nanoscience and Synergetic Innovation of Quantum Information & Quantum Technology, University of Science and Technology of China, Hefei, Anhui 230026, China
- Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Xuefeng Cui
- Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
- Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China
| | - Xiaojun Wu
- CAS Key Laboratory for Materials for Energy Conversion, School of Chemistry and Materials Science, CAS Center for Excellence in Nanoscience and Synergetic Innovation of Quantum Information & Quantum Technology, University of Science and Technology of China, Hefei, Anhui 230026, China
- Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
- Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China
| | - Jinlong Yang
- CAS Key Laboratory for Materials for Energy Conversion, School of Chemistry and Materials Science, CAS Center for Excellence in Nanoscience and Synergetic Innovation of Quantum Information & Quantum Technology, University of Science and Technology of China, Hefei, Anhui 230026, China
- Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
- Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China
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7
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Li HX, Wang MH, Li Q, Cui ZH. Two-dimensional Be 2Al and Be 2Ga monolayer: anti-van't Hoff/Le Bel planar hexacoordinate bonding and superconductivity. Phys Chem Chem Phys 2023; 25:1105-1113. [PMID: 36514964 DOI: 10.1039/d2cp04595h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Because of the electron deficiency of boron, a triangular network with planar hexacoordination is the most common structural and bonding property for isolated boron clusters and two-dimensional (2D) boron sheets. However, this network is a rule-breaking structure and bonding case for all other main-group elements. Herein, the Be2M (M = Al and Ga) 2D monolayer with P6/mmm space group was found to be the lowest-energy structure with planar hexacoordinate Be/Al/Ga motifs. More interestingly, Be2Al and Be2Ga were observed to be intrinsic phonon-mediated superconductors with a superconducting critical temperature (Tc) of 5.9 and 3.6 K, respectively, where compressive strain could further enhance their Tc. The high thermochemical and kinetic stability of Be2M make a promising candidate for experimental realization, considering its high cohesive energy, absence of soft phonon modes, and good resistance to high temperature. Moreover, the feasibility of directly growing Be2M on the electride Ca2N substrate was further demonstrated, where its intriguing electronic and superconducting properties were well maintained in comparison with the freestanding monolayer. The Be2M monolayer with rule-breaking planar hexacoordinate motifs firmly pushes the ultimate connection of the "anti-van't Hoff/Le Bel" structure with promising physical properties.
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Affiliation(s)
- Hai-Xia Li
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130023, China.
| | - Meng-Hui Wang
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130023, China.
| | - Quan Li
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130023, People's Republic of China
| | - Zhong-Hua Cui
- Institute of Atomic and Molecular Physics, Jilin University, Changchun 130023, China. .,Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), Jilin University, Changchun 130023, China
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8
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Chen H, Liu R, Lu J, Zhao X, Hu G, Ren J, Yuan X. Intrinsic Valley-Polarized Quantum Anomalous Hall Effect and Controllable Topological Phase Transition in Janus Fe 2SSe. J Phys Chem Lett 2022; 13:10297-10304. [PMID: 36305806 DOI: 10.1021/acs.jpclett.2c02794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The valley-polarized quantum anomalous Hall effect (VP-QAHE) in topological materials, which usually is induced by applying external manipulations, has attracted intensive attention. Here, we predict the formation and regulation of the intrinsic VP-QAHE in ferromagnetic Janus monolayer Fe2SSe. Spontaneous valley polarization (VP) appears without external manipulations due to the Janus structure in monolayer Fe2SSe. The spontaneous VP in addition to the nonzero Chern number in Fe2SSe confirm the intrinsic VP-QAHE. Besides, the topologically protected chiral-spin-valley locking edge states can be regulated by reversing the magnetization. Topological phase transitions between metal, half-metal, topological insulator, and ferrovalley phases can be obtained by applying biaxial strains in Fe2SSe, and the nontrivial band gap reaches up to 441 meV. Also, the topological phase with the VP-QAHE is robust under certain conditions. Both the intrinsic VP-QAHE and controllable topological phase transitions can be achieved in Janus monolayer Fe2SSe, which provides an avenue for the applications of dissipationless valleytronic devices.
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Affiliation(s)
- Hongxin Chen
- School of Physics and Electronics, Shandong Normal University, Jinan250358, China
| | - Ran Liu
- School of Physics and Electronics, Shandong Normal University, Jinan250358, China
| | - Jiajun Lu
- School of Physics and Electronics, Shandong Normal University, Jinan250358, China
| | - Xiuwen Zhao
- School of Physics and Electronics, Shandong Normal University, Jinan250358, China
| | - Guichao Hu
- School of Physics and Electronics, Shandong Normal University, Jinan250358, China
| | - Junfeng Ren
- School of Physics and Electronics, Shandong Normal University, Jinan250358, China
- Shandong Provincial Engineering and Technical Center of Light Manipulations & Institute of Materials and Clean Energy, Shandong Normal University, Jinan250358, China
| | - Xiaobo Yuan
- School of Physics and Electronics, Shandong Normal University, Jinan250358, China
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9
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Gao Y, Jiao J, Meng Y, Liu Q, Cheng L. Structural growth, stability and electronic characteristics of Al-Sc clusters. COMPUT THEOR CHEM 2022. [DOI: 10.1016/j.comptc.2022.113942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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10
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Yan C, Yi J, Wang P, Li D, Cheng L. Assembling Au 4 Tetrahedra to 2D and 3D Superatomic Crystals Based on Superatomic-Network Model. ACS OMEGA 2022; 7:32708-32716. [PMID: 36120006 PMCID: PMC9476519 DOI: 10.1021/acsomega.2c04391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Accepted: 08/03/2022] [Indexed: 06/15/2023]
Abstract
Thiolate-protected gold nanoclusters (denoted as Au m (SR) n or Au n L m ) have received extensive attention both experimentally and theoretically. Understanding the growth mode of the Au4 unit in Au m (SR) n is of great significance for experimental synthesis and the search for new gold clusters. In this work, we first build six clusters of Au7(AuCl2)3, Au12(AuCl2)4, Au16(AuCl2)6, Au22(AuCl2)6, and Au30(AuCl2)6 with the Au4 unit as the basic building blocks. Density functional theory (DFT) calculations show that these newly designed clusters have high structural and electronic stabilities. Based on chemical bonding analysis, the electronic structures of these clusters follow the superatom network (SAN) model. Inspired by the cluster structures, we further predicted an Au4 two-dimensional (2D) monolayer and a three-dimensional (3D) crystal using graphene and diamond as templates, respectively. The computational results demonstrate that the two structures have high dynamic, thermal, and mechanical stabilities, and both structures exhibit metallic properties according to the band structures calculated at the HSE06 level. The chemical bonding analysis by the solid-state natural density partitioning (SSAdNDP) method indicates that they are superatomic crystals assembled by two electron Au4 - superatoms. With this construction strategy, the new bonding pattern and properties of Au n L m are studied and the structure types of gold are enriched.
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Affiliation(s)
- Chen Yan
- Department
of Chemistry, Key Laboratory of Functional Inorganic Materials of
Anhui Province, Anhui University, Hefei, Anhui 230601, P. R. China
| | - Jiuqi Yi
- Department
of Chemistry, Key Laboratory of Functional Inorganic Materials of
Anhui Province, Anhui University, Hefei, Anhui 230601, P. R. China
| | - Peng Wang
- Department
of Chemistry, Key Laboratory of Functional Inorganic Materials of
Anhui Province, Anhui University, Hefei, Anhui 230601, P. R. China
| | - Dan Li
- Department
of Chemistry, Key Laboratory of Functional Inorganic Materials of
Anhui Province, Anhui University, Hefei, Anhui 230601, P. R. China
| | - Longjiu Cheng
- Department
of Chemistry, Key Laboratory of Functional Inorganic Materials of
Anhui Province, Anhui University, Hefei, Anhui 230601, P. R. China
- Key
Laboratory of Structure and Functional Regulation of Hybrid Materials, Anhui University, Ministry of Education, Hefei 230601, P. R. China
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11
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Song G, Zhang C, Xie T, Wu Q, Zhang B, Huang X, Li Z, Li G, Gao B. Intrinsic ferromagnetism and the quantum anomalous Hall effect in two-dimensional MnOCl 2 monolayers. Phys Chem Chem Phys 2022; 24:20530-20537. [PMID: 35996999 DOI: 10.1039/d2cp02384a] [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
Due to their potential application in spintronic devices, two-dimensional (2D) ferromagnetic materials are highly desired. We used first-principles calculations and Monte Carlo simulations to investigate the electronic structure and magnetic characteristics of the MnOCl2 monolayers. We discovered two stable monolayer structures, Pmna-MnOCl2 and Pmmn-MnOCl2. Our findings show that the Pmna-MnOCl2 monolayer is an intrinsic ferromagnetic semiconductor with an indirect band gap of 0.152 eV and a Curie temperature (TC) of 202 K, while the Pmmn-MnOCl2 monolayer is an intrinsic ferromagnetic Dirac semimetal with a high TC (910 K) and triaxial magnetic anisotropy. We also show that a Pmmn-MnOCl2 monolayer with a nontrivial band gap of 6.2 meV can achieve the quantum anomalous Hall effect (QAHE) with Chern number C = 1. Additionally, the existence of a gapless edge state can be flexibly regulated by choosing the terminal edges. Our studies reveal that the Pmmn-MnOCl2 monolayer can serve as a candidate material to achieve high-temperature QAHE.
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Affiliation(s)
- Guang Song
- Department of Physics, Huaiyin Institute of Technology, Huaian 223003, China.
| | - Chengfeng Zhang
- Department of Physics, Huaiyin Institute of Technology, Huaian 223003, China.
| | - Tengfei Xie
- Department of Physics, Huaiyin Institute of Technology, Huaian 223003, China.
| | - Qingkang Wu
- Department of Physics, Huaiyin Institute of Technology, Huaian 223003, China.
| | - Bingwen Zhang
- Fujian Key Laboratory of Functional Marine Sensing Materials, Minjiang University, Fuzhou 350108, China
| | - Xiaokun Huang
- School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333001, China
| | - Zhongwen Li
- Department of Physics, Huaiyin Institute of Technology, Huaian 223003, China.
| | - Guannan Li
- Department of Physics, Huaiyin Institute of Technology, Huaian 223003, China.
| | - Benling Gao
- Department of Physics, Huaiyin Institute of Technology, Huaian 223003, China.
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12
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He C, Shi P, Pang D, Zhang Z, Lin L. Design of S-vacancy FeS2 as an electrocatalyst for NO reduction reaction: A DFT study. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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13
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Karim AMMT, Jubair M, Nuruzzaman M, Zilani MAK. An ab initio Study on the Mechanical Stability, Spin-Dependent Electronic Properties, Molecular Orbital Predictions, and Optical Features of Antiperovskite A 3InN (A = Co, Ni). ACS OMEGA 2022; 7:13588-13603. [PMID: 35559198 PMCID: PMC9088782 DOI: 10.1021/acsomega.1c07039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Accepted: 03/31/2022] [Indexed: 06/15/2023]
Abstract
Structural, mechanical, spin-dependent electronic, magnetic, and optical properties of antiperovskite nitrides A3InN (A = Co, Ni) along with molecular orbital diagram are investigated here by using an ab initio density functional theory (DFT). The mechanical stability, deformation, damage tolerance and ductile nature of A3InN are confirmed from elastic calculations. Different mechanical anisotropy factors are also discussed in detail. The spin dependent electronic properties such as the band structure and density of states (DOS) of A3InN are studied and, the dispersion curves and DOS at Fermi level are different for up and down spins only in case of Co3InN. These calculations also suggest that Co3InN and Ni3InN behave as ferromagnetic and nonmagnetic, respectively. The induced total magnetic moment of Co3InN is found 2.735 μB/cell in our calculation. Mulliken bond population analysis shows that the atomic bonds of A3InN are contributed by both ionic and covalent bonds. Molecular orbital diagrams of A3InN antiperovskites are proposed by analyzing orbital projected band structures. The formation of a molecular orbital energy diagram for Co3InN is similar to Ni3InN with respect to hybridization and orbital sequencing. However, the orbital positions with respect to the Fermi level (E F) and separations between them are different. The Fermi surface of A3InN is composed of multiple nonspherical electron and hole type sheets in which Co3InN displays a spin-dependent Fermi surface. The various ground-state optical functions such as real and imaginary parts of the dielectric constant, optical conductivity, reflectivity, refractive index, absorption coefficient, and loss function of A3InN are studied with implications. The reflectivity spectra reveal that A3InN reflects >45% of incident electromagnetic radiations in both the visible and ultraviolet region, which is an ideal feature of coating material for avoiding solar heating.
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Affiliation(s)
- Al Momin Md Tanveer Karim
- Institute
for Superconducting and Electronic Materials, AIIM, University of Wollongong, Wollongong, NSW 2500, Australia
- Department
of Physics, Rajshahi University of Engineering
& Technology, Rajshahi 6204, Bangladesh
| | - Md Jubair
- Department
of Physics, Rajshahi University of Engineering
& Technology, Rajshahi 6204, Bangladesh
| | - Md Nuruzzaman
- Department
of Physics, Rajshahi University of Engineering
& Technology, Rajshahi 6204, Bangladesh
| | - Md Abdul Kader Zilani
- Department
of Physics, Rajshahi University of Engineering
& Technology, Rajshahi 6204, Bangladesh
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14
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Sheng K, Yuan HK, Wang ZY. Monolayer gadolinium halides, GdX 2 (X = F, Cl, Br): intrinsic ferrovalley materials with spontaneous spin and valley polarizations. Phys Chem Chem Phys 2022; 24:3865-3874. [PMID: 35088778 DOI: 10.1039/d1cp05097d] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two-dimensional (2D) intrinsic ferrovalley semiconductors provide unprecedented opportunities to investigate valley physics as well as providing promising device applications due to their exceptional combination of spontaneous spin and valley polarizations. Here, we have predicted from first-principles calculations and Monte Carlo simulations that monolayers (MLs) GdX2 are such extremely rare excellent materials. Apart from their robust stabilities energetically, dynamically, thermally, and mechanically, these 2D materials are found to be semiconducting intrinsic ferromagnets where the magnetic coupling is ascribed to 5d-electron-mediated 4f-4f exchange interactions. Moreover, MLs GdX2 (X = F, Cl, Br) not only exhibit significant magnetic anisotropy energy of 351, 268, and 30 μeV per Gd, but also have a high Curie temperature of 300, 245, and 225 K, respectively. In particular, spontaneous valley polarization in three systems occurs due to the cooperative interplay between the spin-orbit coupling and magnetic exchange interactions, whose magnitude is as sizable as 55, 38, and 82 meV for MLs GdF2, GdCl2, and GdBr2, respectively. Under the action of an in-plane longitudinal electrical field, the valley-contrasting Berry curvatures arising from the broken space-inversion and time-reversal symmetries in MLs GdX2 could yield opposite transverse velocities of the carriers, giving rise to the occurrence of a spin-polarized anomalous valley Hall effect. Overall, these findings render 2D GdX2 a class of promising candidate materials for experimental studies and practical spintronics and valleytronics applications.
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Affiliation(s)
- Kang Sheng
- School of Physical Science and Technology, Southwest University, Chongqing 400715, China.
| | - Hong-Kuan Yuan
- School of Physical Science and Technology, Southwest University, Chongqing 400715, China.
| | - Zhi-Yong Wang
- School of Physical Science and Technology, Southwest University, Chongqing 400715, China.
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15
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Jiang X, Yang T, Fei G, Yi W, Liu X. Novel Two-Dimensional ABX 3 Dirac Materials: Achieving a High-Speed Strain Sensor via a Self-Doping Effect. J Phys Chem Lett 2022; 13:676-685. [PMID: 35023752 DOI: 10.1021/acs.jpclett.1c03829] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The pristine semimetal property of two-dimensional (2D) Dirac materials has limited their practical applications in today's electronic devices. Here we report a new type of 2D Dirac material, termed ABX3 (A = F, Cl, Br, or I; B = P or As; X = C or Si) monolayers. We demonstrate that 14 ABX3 monolayers possess good stability and high Fermi velocities. The FPC3, ClPC3, BrPC3, and FAsC3 monolayers exhibit a pristine n-type self-doping Dirac cone due to the interactions of electrons between the A-B units and C6 rings, which is beneficial for realizing high-speed carriers. Interestingly, the ClPSi3 monolayer exhibits remarkable responses to strain because a self-doping Dirac cone can be induced by relatively small in-plane biaxial strains (-5%), and the current-voltage (I-V) curves verified that the response strength is 11.57 times that of the graphene-based strain sensor at a bias of 1.10 V, indicating that the ClPSi3 monolayer could be used as a potential excellent strain sensor.
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Affiliation(s)
- Xingang Jiang
- Laboratory of High Pressure Physics and Material Science (HPPMS), School of Physics and Physical Engineering, Qufu Normal University, Qufu, Shandong 273165, China
| | - Tao Yang
- Laboratory of High Pressure Physics and Material Science (HPPMS), School of Physics and Physical Engineering, Qufu Normal University, Qufu, Shandong 273165, China
- Institute of Advanced Materials, School of Electromechanical and Automobile Engineering, Huanggang Normal University, Huanggang, Hubei 438000, China
| | - Ge Fei
- Laboratory of High Pressure Physics and Material Science (HPPMS), School of Physics and Physical Engineering, Qufu Normal University, Qufu, Shandong 273165, China
| | - Wencai Yi
- Laboratory of High Pressure Physics and Material Science (HPPMS), School of Physics and Physical Engineering, Qufu Normal University, Qufu, Shandong 273165, China
- Advanced Research Institute of Multidisciplinary Science, Qufu Normal University, Qufu, Shandong 273165, China
| | - Xiaobing Liu
- Laboratory of High Pressure Physics and Material Science (HPPMS), School of Physics and Physical Engineering, Qufu Normal University, Qufu, Shandong 273165, China
- Advanced Research Institute of Multidisciplinary Science, Qufu Normal University, Qufu, Shandong 273165, China
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16
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Zhao Y, Liu Q, Xing J, Jiang X, Zhao J. FeSi 2: a two-dimensional ferromagnet containing planar hexacoordinate Fe atoms. NANOSCALE ADVANCES 2022; 4:600-607. [PMID: 36132695 PMCID: PMC9417100 DOI: 10.1039/d1na00772f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Accepted: 12/12/2021] [Indexed: 06/16/2023]
Abstract
As an unconventional bonding pattern different from conventional chemistry, the concept of planar hypercoordinate atoms was first proposed in the molecular system, and it has been recently extended to 2D periodic systems. Using first-principles calculations, herein we predict a stable FeSi2 monolayer with planar hexacoordinate Fe atoms. Due to its abundant multicenter bonds, the FeSi2 monolayer shows excellent thermal and kinetic stability, anisotropic mechanical properties and room-temperature ferromagnetism (T C ∼360 K). Furthermore, we have demonstrated the feasibility of directly growing an FeSi2 monolayer on a Si (110) substrate while maintaining the novel electronic and magnetic properties of the freestanding monolayer. The FeSi2 monolayer synthesized in this way would be compatible with the mature silicon semiconductor technology and could be utilized for spintronic devices.
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Affiliation(s)
- Ying Zhao
- Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), Dalian University of Technology Dalian 116024 China
| | - Qinxi Liu
- Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), Dalian University of Technology Dalian 116024 China
| | - Jianpei Xing
- Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), Dalian University of Technology Dalian 116024 China
| | - Xue Jiang
- Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), Dalian University of Technology Dalian 116024 China
| | - Jijun Zhao
- Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), Dalian University of Technology Dalian 116024 China
- Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education, Nanjing University of Aeronautics and Astronautics Nanjing 210016 China
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17
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Wang MH, Cui ZH, Wang S, Li Q, Zhao J, Chen Z. Two-dimensional Be2Au Monolayer with Planar Hexacoordinate s-Block Metal Atoms: A Superconducting Global Minimum Dirac Material with Two Perfect Dirac Node-Loops. Chem Sci 2022; 13:11099-11109. [PMID: 36320472 PMCID: PMC9517706 DOI: 10.1039/d2sc03614b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Accepted: 08/26/2022] [Indexed: 11/21/2022] Open
Abstract
Using a starlike Be6Au7− cluster as a building block and following the bottom-up strategy, an intriguing two-dimensional (2D) binary s-block metal Be2Au monolayer with a P6/mmm space group was theoretically designed. Both the Be6Au7− cluster and the 2D monolayer are global minima featuring rule-breaking planar hexacoordinate motifs (anti-van't Hoff/Le Bel arrangement), and their high stabilities are attributed to good electron delocalization and electronic-stabilization-induced steric force. Strikingly, the Be2Au monolayer is a rare Dirac material with two perfect Dirac node-loops in the band structure and is a phonon-mediated superconductor with a critical temperature of 4.0 K. The critical temperature can be enhanced up to 11.0 K by applying compressive strain at only 1.6%. This study not only identifies a new binary s-block metal 2D material, namely Be2Au, which features planar hexacoordination, and a candidate superconducting material for further explorations, but also provides a new strategy to construct 2D materials with novel chemical bonding. A topological superconductor, named Be2Au monolayer, containing planar hexacoordinate s-block metal (Be and Au) atoms was theoretically designed by rationally assembling related clusters.![]()
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Affiliation(s)
- Meng-Hui Wang
- Institute of Atomic and Molecular Physic, Jilin University Changchun 130012 China
| | - Zhong-Hua Cui
- Institute of Atomic and Molecular Physic, Jilin University Changchun 130012 China
- Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), Jilin University Changchun 130012 China
| | - Sheng Wang
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University Changchun 130023 People's Republic of China
| | - Quan Li
- State Key Laboratory of Superhard Materials, College of Physics, Jilin University Changchun 130023 People's Republic of China
| | - Jijun Zhao
- Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education Dalian 116024 China
| | - Zhongfang Chen
- Department of Chemistry, University of Puerto Rico San Juan PR 00931 USA
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18
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Ruppert H, Sigmund LM, Greb L. Calix[4]pyrroles as ligands: recent progress with a focus on the emerging p-block element chemistry. Chem Commun (Camb) 2021; 57:11751-11763. [PMID: 34661225 DOI: 10.1039/d1cc05120b] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Calix[4]pyrroles are readily synthesized in one step from pyrroles and ketones. For several decades, these macrocycles have been exploited as powerful anion receptors or ligands for transition and rare-earth metals. In contrast, calix[4]pyrrolates as ligands for p-block elements were established only in 2018. The present feature article reviews these developments, together with the recent progress on s-, d-, and f-block element complexes of the calix[4]pyrroles. Particular focus is given on the calix[4]pyrrolato aluminate and the corresponding silane, both featuring square planar-coordinated p-block elements in their highest oxidation states. These unique "anti-van't-Hoff-Le-Bel" structures introduce valuable characteristics into main-group element chemistry, such as agostic interactions or ligand-to-metal charge transfer absorptions. The most vital reactivities are highlighted, which rely on properties ranging from amphoterism, redox-activity, and a small HOMO-LUMO gap up to the ability to provide a platform for additional external stimuli. Overall, these developments underscore the beneficial impact of structural constraint of p-block elements and element-ligand cooperativity to enhance the functionality of the most abundant elements in their native oxidation states.
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Affiliation(s)
- Heiko Ruppert
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany.
| | - Lukas M Sigmund
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany.
| | - Lutz Greb
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany.
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19
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Zhang Q, Wang X, Yang S. δ-SnS: An Emerging Bidirectional Auxetic Direct Semiconductor with Desirable Carrier Mobility and High-Performance Catalytic Behavior toward the Water-Splitting Reaction. ACS APPLIED MATERIALS & INTERFACES 2021; 13:31934-31946. [PMID: 34196545 DOI: 10.1021/acsami.1c03650] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
We propose a novel two-dimensional SnS allotrope (monolayer δ-SnS) based on an auxetic δ-phosphorene configuration using first-principles calculations. This monolayer appears to have outstanding stability as revealed by its energetic, kinetic, thermodynamic, and mechanic calculations, and it can withstand temperatures as high as 900 K. Monolayer δ-SnS is a wide direct-bandgap (2.354 eV) semiconductor, and its electron mobility is as high as ∼1.25 × 103 cm2 V-1 s -1, higher than that of monolayer KTlO (∼450 cm2 V-1 s-1) and MoS2 (∼200 cm2 V-1 s-1). Optical absorption spectra, reaching up to the order of ∼105 cm-1, are obviously excellent in the visible-light region, suggesting efficient harvesting of solar radiation. Because of its unique atomic motif, monolayer δ-SnS presents an unusual bidirectional auxetic effect: a high negative in-plane Poisson's ratio (-0.048 and -0.068), which is larger than those for many recently reported two-dimensional auxetic materials, e.g., black phosphorene (-0.027), borophene (-0.04), and monolayer penta-B2N4 (-0.02). The bandgap and band edge can be substantially manipulated under strain to meet the requirement of the water-splitting reaction. Particularly, when pH = 7, suitable band-edge alignments and small overpotentials of the photocatalytic OER (oxygen evolution reaction) and HER (hydrogen evolution reaction) appear, endowing monolayer δ-SnS with great potential as an efficient visible-light-driven bifunctional photocatalyst for water splitting.
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Affiliation(s)
- Qiang Zhang
- College of Science, University of Shanghai for Science and Technology, Shanghai 200093, P. R. China
| | - Xian Wang
- College of Science, University of Shanghai for Science and Technology, Shanghai 200093, P. R. China
| | - Shali Yang
- College of Science, University of Shanghai for Science and Technology, Shanghai 200093, P. R. China
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20
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Yang Z, Zheng Y, Li W, Zhang J. Tuning the electrochemical performance of Ti 3C 2 and Hf 3C 2 monolayer by functional groups for metal-ion battery applications. NANOSCALE 2021; 13:11534-11543. [PMID: 34180919 DOI: 10.1039/d0nr07899a] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
It is extremely important to design and explore high-efficiency anode materials in metal-ion batteries with strong stability, good electronic conductivity, and high storage capacity. Mxenes are susceptible to functionalization due to the presence of dangling bonds on the surface; thus, their chemical properties can be tuned accordingly by functional groups, which provide an opportunity to design novel materials with good electrochemical performance. The geometry and stability of Ti3C2X2 and Hf3C2X2 (X = Si, P, S, and Cl) monolayers are explored with the aid of density functional theory and the ab initio molecular dynamics (AIMD) simulations. Ti3C2X2 and Hf3C2X2 (X = S, Cl) exhibit high thermodynamic stability than Ti3C2X2 and Hf3C2X2 (X = Si, P) as found from formation energy and AIMD simulations. Then, the electrochemical performance of S- and Cl-functionalized Ti3C2 and Hf3C2 monolayers was further explored for use as anode materials in metal-ion batteries (including Li, Na, K, Mg, Ca, and Al). The high structural stability, metallic nature, low diffusion energy barrier, and proper open circuit voltage make Ti3C2 and Hf3C2 monolayer-functionalized with S and Cl as rechargeable metal-ion anode materials. More importantly, the stable multilayer adsorption of Li and Na (Li and Na: up to two layers) ensures high capacities for the Ti3C2S2 monolayer in Li- and Na-ion batteries (462.86 and 462.86 mA h g-1, respectively). In particular, compared with other 2D materials, Ti3C2S2 monolayer exhibits a higher capacity when used as an anode electrode material for Mg-ion batteries, mainly due to the perfect matching of the diameter of Mg and the lattice constant of Ti3C2S2. The results show that S- and Cl-functionalized Mxenes are promising metal-ion anode materials and provide valuable insights into the next generation of energy storage and conversion devices. This discovery is of positive significance for the design of new MXenes.
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Affiliation(s)
- Zhifang Yang
- Faculty of Chemistry, National & Local United Engineering Laboratory for Power Batteries, Northeast Normal University, Changchun 130024, China.
| | - Yanping Zheng
- Faculty of Chemistry, Tonghua Normal University, Tonghua, 134002, China
| | - Wenliang Li
- Faculty of Chemistry, National & Local United Engineering Laboratory for Power Batteries, Northeast Normal University, Changchun 130024, China.
| | - Jingping Zhang
- Faculty of Chemistry, National & Local United Engineering Laboratory for Power Batteries, Northeast Normal University, Changchun 130024, China.
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21
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Liu Q, Hu Y, Cheng L. Catalytic properties of nano-brass clusters: A density functional theory study. COMPUT THEOR CHEM 2021. [DOI: 10.1016/j.comptc.2021.113237] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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22
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Wu D, Zhuo Z, Lv H, Wu X. Two-Dimensional Cr 2X 3S 3 (X = Br, I) Janus Semiconductor with Intrinsic Room-Temperature Magnetism. J Phys Chem Lett 2021; 12:2905-2911. [PMID: 33725451 DOI: 10.1021/acs.jpclett.1c00454] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The exploration of two-dimensional (2D) semiconductors with intrinsic room-temperature magnetism for use in nanoscale spintronic devices is of particular interest. Recently, the ferromagnetic CrX3 monolayer (X = Br, I) has received growing attention, but low critical temperature hinders its practical applications in spintronics. Here, using first-principles calculations, we report 2D Cr2X3S3 (X = Br, I) Janus semiconductors with room-temperature magnetism by replacing one layer of halogon atoms with sulfur atoms in CrX3 monolayer. Our results demonstrate that Cr2Br3S3 and Cr2I3S3 Janus crystals are ferrimagnetic semiconductors, that maintain their magnetic order, with a direct bandgap of 1.19 and 0.61 eV and high critical temperature of 387 and 447 K, respectively. The residual unpaired p electrons on the S anions lead to a strong direct-exchange interaction between the Cr and S atoms. Moreover, their room-temperature magnetism is robust under biaxial strain, while the bandgap can be remarkably modulated with strain. The novel magnetic properties in 2D Cr2X3S3 Janus magnetic semiconductors give them promising applications in spintronics.
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Affiliation(s)
- Daoxiong Wu
- Hefei National Laboratory for Physical Sciences at the Microscale, School of Chemistry and Materials Sciences, CAS Key Laboratory of Materials for Energy Conversion, and CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Zhiwen Zhuo
- Hefei National Laboratory for Physical Sciences at the Microscale, School of Chemistry and Materials Sciences, CAS Key Laboratory of Materials for Energy Conversion, and CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Haifeng Lv
- Hefei National Laboratory for Physical Sciences at the Microscale, School of Chemistry and Materials Sciences, CAS Key Laboratory of Materials for Energy Conversion, and CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Xiaojun Wu
- Hefei National Laboratory for Physical Sciences at the Microscale, School of Chemistry and Materials Sciences, CAS Key Laboratory of Materials for Energy Conversion, and CAS Center for Excellence in Nanoscience, University of Science and Technology of China, Hefei, Anhui 230026, China
- Synergetic Innovation of Quantum Information & Quantum Technology, University of Science and Technology of China, Hefei, Anhui 230026, China
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23
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Huang CX, Li G, Yang LM, Ganz E. Ammonia Synthesis Using Single-Atom Catalysts Based on Two-Dimensional Organometallic Metal Phthalocyanine Monolayers under Ambient Conditions. ACS APPLIED MATERIALS & INTERFACES 2021; 13:608-621. [PMID: 33372749 DOI: 10.1021/acsami.0c18472] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
We have identified three novel metal phthalocyanine (MPc, M = Mo, Re, and Tc) single-atom catalyst candidates with excellent predicted performance for the production of ammonia from electrocatalytic nitrogen reduction reaction (NRR) through a combination of high-throughput screening and first-principles calculations on a series of 3d, 4d, and 5d transition metals anchored onto extended Pc monolayer catalysts. Analysis of the energy band structures and projected density of states of N2-MPc revealed significant orbital hybridization and charge transfer between the adsorbed N2 and catalyst MPc, which accounts for the high catalytic activity. Among 30 MPc catalysts, MoPc and TcPc monolayers were found to be the most promising new NRR catalysts, as they exhibit excellent stability, low onset potential, and high selectivity. A comprehensive reaction pathway search found that the maximum free energy changes for the MoPc and TcPc monolayers are 0.33 and 0.54 eV, respectively. As a distinctive nature of this work, the hybrid reaction pathway was considered extensively and searched systematically. The onset potential of the hybrid pathway is found to be smaller than or comparable to that of the commonly known pure pathway. Thus, the hybrid path is highly competitive with low onset potential and high activity. The hybrid pathway is expected to have an important impact on future research on the mechanism of NRR, and it will open up a new way to explore the mechanism of the NRR reaction. We hope that our work will provide impetus to the creation of new catalysts for reduction of N2 to NH3. This work provides new insights into the rational design of NRR catalysts and explores novel reaction pathways under ambient or mild conditions.
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Affiliation(s)
- Chun-Xiang Huang
- Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education; Center for Computational Quantum Chemistry, School of Chemistry, South China Normal University, Guangzhou 510006, China
- Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica, Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Materials Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Guoliang Li
- Key Laboratory of Theoretical Chemistry of Environment, Ministry of Education; Center for Computational Quantum Chemistry, School of Chemistry, South China Normal University, Guangzhou 510006, China
| | - Li-Ming Yang
- Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica, Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Materials Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Eric Ganz
- School of Physics and Astronomy, University of Minnesota, 115 Union St. SE, Minneapolis, Minnesota 55455, United States
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24
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Hu Y, Yin Y, Li S, Zhou H, Li D, Zhang G. Three-Fold Enhancement of In-Plane Thermal Conductivity of Borophene through Metallic Atom Intercalation. NANO LETTERS 2020; 20:7619-7626. [PMID: 32852213 DOI: 10.1021/acs.nanolett.0c03135] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We studied the thermal conductivity of Al-intercalated bilayer δ4 borophene sheet by solving phonon Boltzmann transport equation based on density functional theory. Although the overall atomic density of Al-intercalated borophene is larger than that of δ4 borophene, it possesses significant enhancement in in-plane thermal conductivity. With metallic atom intercalation, the armchair-direction thermal conductivity increases from 53.8 to 160.2 W m-1 K-1 and that along the zigzag direction increases from 115.7 to 157.2 W m-1 K-1. This pronounced enhancement is attributed to the bunching of the acoustic branches in the Al-intercalated borophene, which decreases the phase space for the high frequency three acoustic phonon scattering processes. In addition to the pronounced increased thermal conductivity, the Al-intercalation also tunes the in-plane anisotropy. This study illustrates the importance of metallic atom intercalation in the in-plane thermal conductivity of 2D van der Waals materials and also has practical implications for fields ranging from thermal management to thermoelectrics design.
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Affiliation(s)
- Yanxiao Hu
- School of Science, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
| | - Yan Yin
- School of Science, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
| | - Shichang Li
- School of Science, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
| | - Hangbo Zhou
- Institute of High Performance Computing, A*STAR, 138632, Singapore
| | - Dengfeng Li
- School of Science, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
| | - Gang Zhang
- Institute of High Performance Computing, A*STAR, 138632, Singapore
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25
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Steglenko DV, Tkachenko NV, Boldyrev AI, Minyaev RM, Minkin VI. Stability, electronic, and optical properties of two-dimensional phosphoborane. J Comput Chem 2020; 41:1456-1463. [PMID: 32176381 DOI: 10.1002/jcc.26189] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2020] [Accepted: 02/24/2020] [Indexed: 01/16/2023]
Abstract
The structure and properties of two-dimensional phosphoborane sheets were computationally investigated using Density Functional Theory calculations. The calculated phonon spectrum and band structure point to dynamic stability and allowed characterization of the predicted two-dimensional material as a direct-gap semiconductor with a band gap of ~1.5 eV. The calculation of the optical properties showed that the two-dimensional material has a relatively small absorptivity coefficient. The parameters of the mechanical properties characterize the two-dimensional phosphoborane as a relatively soft material, similar to the monolayer of MoS2 . Assessment of thermal stability by the method of molecular dynamics indicates sufficient stability of the predicted material, which makes it possible to observe it experimentally.
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Affiliation(s)
- Dmitriy V Steglenko
- Institute of Physical and Organic Chemistry, Southern Federal University, Rostov-on-Don, Russia
| | - Nikolay V Tkachenko
- Department of Chemistry and Biochemistry, Utah State University, Logan, Utah, USA
| | - Alexander I Boldyrev
- Department of Chemistry and Biochemistry, Utah State University, Logan, Utah, USA
| | - Ruslan M Minyaev
- Institute of Physical and Organic Chemistry, Southern Federal University, Rostov-on-Don, Russia
| | - Vladimir I Minkin
- Institute of Physical and Organic Chemistry, Southern Federal University, Rostov-on-Don, Russia
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26
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Abstract
ConspectusAs one of the most important and versatile elements, carbon renders itself as one of the most fundamental and cutting-edge topics in chemistry, physics, and materials science. Many carbon-based chemical rules were established accordingly. While the tetrahedral predilection of tetracoordinate carbon has been a cornerstone of organic chemistry since 1874, almost a century later tetracoordinate carbon was found to be able to adopt planar structures known as planar tetracoordinate carbon (ptC), which are stabilized electronically by good π-acceptor (delocalization of a lone electron pair of ptC) or σ-donor (promoting electron transfer to electron-deficient bonding) substituents or mechanically by appropriate steric enforcement. The experimental and theoretical achievements for the rule-breaking ptC species totally refreshed our understanding of chemical bonding and triggered exploration of peculiar molecules featuring planar pentacoordinate carbon (ppC) and planar hexacoordinate carbon (phC) as well as other outlandish species such as planar hypercoordinate silicon.While the planar hypercoordinate carbon chemistry has been gradually established for molecules in the past five decades, there is growing interest in pursuing their extension systems, especially in two-dimensional (2D) space as a result of the recent extensive studies of graphene and its analogues. Though the natural 2D layered crystals do not contain any planar hypercoordinate carbon or silicon, several 2D nanosheets featuring planar or quasi-planar hypercoordinate ones have been theoretically suggested. Encouragingly, these unique planar configurations possess decent stabilities, and some of them are even the global minimum structure, exhibiting great potential for experimental realization. As the nature of a material is mainly determined by its structural characteristics (e.g., dimensionality, crystallography, and bonding), the combination of planar hypercoordinate chemistry and 2D nanoscience not only endows these rule-breaking systems with the merits of 2D materials but also may offer various promising properties and applications. For example, an unusual negative Poisson's ratio can be found in ppC-containing Be5C2 and planar pentacoordinate silicon (ppSi)-containing CaSi monolayers, of which the former has an anisotropic Dirac cone and the latter is a semiconductor with a desirable band gap for the semiconductor industry. Specially, shortly after the theoretical prediction, a planar hexacoordinate silicon (phSi)-containing Cu2Si monolayer was experimentally synthesized and characterized with the 2D Dirac nodal line fermion, which offers a platform to achieve high-speed, low-dissipation nanodevices.In this Account, we review the recent progress, mostly by density functional theory (DFT) computations, in designing 2D materials with planar hypercoordinate motifs. We describe the key achievements in this field, paying special attention to the "bottom-up" and "isoelectronic substitution" design strategies. In addition, the fundamental stabilization mechanisms of planar hypercoordinate motifs in an infinite layer are discussed. We hope that this Account will inspire more experimental and theoretical efforts to explore nanomaterials with such unconventional chemical bonding.
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Affiliation(s)
- Yu Wang
- Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China
| | - Yafei Li
- Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China
| | - Zhongfang Chen
- Department of Chemistry, University of Puerto Rico, Rio Piedras Campus, San Juan, Puerto Rico 00931, United States
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Liu L, Zhou X, Guo L, Yan S, Li Y, Jiang S, Tai X. Bimetallic Au–Pd alloy nanoparticles supported on MIL-101(Cr) as highly efficient catalysts for selective hydrogenation of 1,3-butadiene. RSC Adv 2020; 10:33417-33427. [PMID: 35515058 PMCID: PMC9056711 DOI: 10.1039/d0ra06432g] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Accepted: 09/02/2020] [Indexed: 11/21/2022] Open
Abstract
Gold–palladium (Au–Pd) bimetallic nanoparticle (NP) catalysts supported on MIL-101(Cr) with Au : Pd mole ratios ranging from 1 : 3 to 3 : 1 were prepared through coimpregnation and H2 reduction. Au–Pd NPs were homogeneously distributed on the MIL-101(Cr) with mean particle sizes of 5.6 nm. EDS and XPS analyses showed that bimetallic Au–Pd alloys were formed in the Au(2)Pd(1)/MIL-101(Cr). The catalytic performance of the catalysts was explored in the selective 1,3-butadiene hydrogenation at 30–80 °C on a continuous fixed bed flow quartz reactor. The bimetallic Au–Pd alloy particles stabilized by MIL-101(Cr) presented improved catalytic performance. The as-synthesized bimetallic Au(2)Pd(1)/MIL-101(Cr) with 2 : 1 Au : Pd mole ratio showed the best balance between the activity and butene selectivity in the selective 1,3-butadiene hydrogenation. The Au–Pd bimetallic-supported catalysts can be reused in at least three runs. The work affords a reference on the utilization of a MOF and alloy nanoparticles to develop high-efficiency catalysts. Bimetallic Au–Pd alloy particles stabilized by MIL-101(Cr) showed high activity and butene selectivity for 1,3-butadiene hydrogenation reaction.![]()
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Affiliation(s)
- Lili Liu
- School of Chemistry & Chemical Engineering and Environmental Engineering
- Weifang University
- Weifang 261061
- P. R. China
| | - Xiaojing Zhou
- School of Chemistry & Chemical Engineering and Environmental Engineering
- Weifang University
- Weifang 261061
- P. R. China
| | - Luxia Guo
- School of Chemistry & Chemical Engineering and Environmental Engineering
- Weifang University
- Weifang 261061
- P. R. China
| | - Shijuan Yan
- School of Chemistry & Chemical Engineering and Environmental Engineering
- Weifang University
- Weifang 261061
- P. R. China
| | - Yingjie Li
- School of Chemistry & Chemical Engineering and Environmental Engineering
- Weifang University
- Weifang 261061
- P. R. China
| | - Shuai Jiang
- School of Chemistry & Chemical Engineering and Environmental Engineering
- Weifang University
- Weifang 261061
- P. R. China
| | - Xishi Tai
- School of Chemistry & Chemical Engineering and Environmental Engineering
- Weifang University
- Weifang 261061
- P. R. China
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28
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Alinejad A, Raissi H, Hashemzadeh H. Development and evaluation of a pH-responsive and water-soluble drug delivery system based on smart polymer coating of graphene nanosheets: an in silico study. RSC Adv 2020; 10:31106-31114. [PMID: 35520638 PMCID: PMC9056345 DOI: 10.1039/d0ra06705a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Accepted: 08/15/2020] [Indexed: 12/29/2022] Open
Abstract
The objective of this study is to develop a controlled and water-soluble delivery system for doxorubicin (DOX) based on the coating of graphene (G) with a smart polymer. A combination of polyethyleneimine (PEI) and G–DOX is investigated by performing density functional theory (DFT) calculations and molecular dynamics (MD) simulations. Several parameters have been employed to evaluate the effect of PEI on the adsorption and release mechanisms of DOX. The obtained results indicated that the binding energy of the drug molecule on G in the presence of PEI is enhanced by about 20% under neutral conditions, whereas the drug absorption becomes weaker in an acidic environment so that DOX could be separated from the carrier surface using near-infrared radiation (NIR). Based on the atom in molecule (AIM) theory, two hydrogen bonds with strengths of about −12.59 and −39.99 kJ mol−1 have been established. Furthermore, evaluating the dynamic behavior of the designed systems in water solution shows that the polymer in physiological pH rapidly adsorbed on the drug–carrier complex. However, at acidic pH, it is quickly desorbed from the carrier surface and the G–DOX complex can be exposed to cancer cells. The obtained results of the present research may be used in future experimental work to design smart DDSs. The objective of this study is to develop a controlled and water-soluble delivery system for doxorubicin (DOX) based on the coating of graphene (G) with a smart polymer.![]()
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Affiliation(s)
| | - Heidar Raissi
- Department of Chemistry
- University of Birjand
- Birjand
- Iran
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29
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Parrott LK, Erasmus E. Palladium/graphene oxide nanocomposites with carbon nanotubes and/or magnetite for the reduction of nitrophenolic compounds. RSC Adv 2020; 10:32885-32896. [PMID: 35516474 PMCID: PMC9056596 DOI: 10.1039/d0ra04715e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Accepted: 08/28/2020] [Indexed: 11/23/2022] Open
Abstract
Graphene oxide (GO) was synthesised via the oxidation of graphite and was characterised using ATR FTIR, PXRD, SEM, TEM and TGA. These techniques confirmed the presence of characteristic oxygen-containing functional groups and the resulting increase in interlayer spacing in the nanostructure. GO is used as the support to form nanocomposites composed of combinations of the following: iron oxide nanoparticles (Fe3O4), carbon nanotubes (CNT) and palladium nanoparticles (Pd). The four final nanocomposites formed are: Pd/GO, Pd/Fe3O4/GO, Pd/CNT/GO, and Pd/CNT/Fe3O4/GO. Key intermediates were analysed using ATR FTIR for the confirmation of the modification. Additionally, all composites and their precursors underwent electron microscopic analysis to visually assess composite morphologies and the size distribution of deposited nanoparticles. The Fe3O4 and Pd nanoparticles were indistinguishable from each other in their spherical shape and particle diameters, which were no bigger than 32 nm. From the TGA, incorporation of Fe3O4, CNT and finally Pd into the nanocomposites increased total thermal stability in terms of mass percentage lost over the temperature programme. GO showed significant decomposition, with all nanocomposites remaining relatively stable up to 120 °C. ICP OES results showed total Pd content by mass percentage for each final composite, varied from 7.9% to 9.1% mass Pd/collective mass. XPS confirmed the expected elemental compositions of composites according to their structures and the Pd0 : PdII ratios are obtained. The nanocomposites were tested for the catalytic reduction of nitrophenols. Pd/CNT/Fe3O4/GO gave the highest TOF′ for the reduction of 4-NP and 2-NP. For the reduction of 3-NP, Pd/GO showed the highest TOF′. Nitrophenol's pKa and catalyst TOF′ correlated in a direct proportional relationship for Pd/GO and Pd/Fe3O4/GO. It was found that Pd0 surpassed PdII in catalytic activity. Reduction of PdII to Pd0 took place during the first catalytic cycle. Comparison of the catalytic activity for the reduction of nitrophenol over palladium-supported graphene oxide nanocomposites modified with iron oxide nanoparticles and/or carbon nanotubes.![]()
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Affiliation(s)
- L. K. Parrott
- Department of Chemistry
- University of the Free State
- Bloemfontein 9300
- South Africa
| | - E. Erasmus
- Department of Chemistry
- University of the Free State
- Bloemfontein 9300
- South Africa
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30
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Guo Y, Cao C, Luo F, Huang B, Xiao L, Qian Q, Chen Q. Largely enhanced thermal conductivity and thermal stability of ultra high molecular weight polyethylene composites via BN/CNT synergy. RSC Adv 2019; 9:40800-40809. [PMID: 35540080 PMCID: PMC9076284 DOI: 10.1039/c9ra08416a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Accepted: 12/02/2019] [Indexed: 11/30/2022] Open
Abstract
In recent years, thermally conductive polymer-based composites have garnered significant attention due to their light weight and easy formation process. In this work, the thermal conductivity of ultra high molecular weight polyethylene (UPE) composites was improved through construction of a hybrid filler network of boron nitride sheets (BNs) and carbon nanotubes (CNTs) in the matrix via hot compression. The morphology, UPE aggregate structure, thermal conductivity, heat dissipation capacity and thermal stability of the UPE composites were investigated. The thermal conduction mechanism of the UPE composites was explored through simulations with Agari's semi-empirical formula. The results showed that the thermal conductivity of the UPE composite with 40 wt% BNs and 7 wt% CNTs was 2.38 W m−1 K−1, which was 495% higher than that of pure UPE, showing a synergistic effect between BNs and CNTs. The simulations with Agari's semi-empirical simulation suggested that increasing the CNT content contributed to synergistically assist BNs to form a better continuous and effective hybrid filler thermal network, thereby reducing phonon scattering and thermal resistance between BNs. In addition, UPE composites doped with BNs and CNTs presented better heat dissipation capacity and higher thermal stability as compared to that of pure UPE. The carbon nanotubes (CNTs) synergistically assist boron nitride microsheets (BNs) to form a more continuous and effective thermal conduction path.![]()
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Affiliation(s)
- Yiyou Guo
- Engineering Research Center of Polymer Green Recycling of Ministry Education, Fujian Key Laboratory of Pollution Control & Resource Reuse, College of Environmental Science and Engineering, Fujian Normal University Fuzhou 350007 China
| | - Changlin Cao
- Engineering Research Center of Polymer Green Recycling of Ministry Education, Fujian Key Laboratory of Pollution Control & Resource Reuse, College of Environmental Science and Engineering, Fujian Normal University Fuzhou 350007 China
| | - Fubin Luo
- Engineering Research Center of Polymer Green Recycling of Ministry Education, Fujian Key Laboratory of Pollution Control & Resource Reuse, College of Environmental Science and Engineering, Fujian Normal University Fuzhou 350007 China
| | - Baoquan Huang
- Engineering Research Center of Polymer Green Recycling of Ministry Education, Fujian Key Laboratory of Pollution Control & Resource Reuse, College of Environmental Science and Engineering, Fujian Normal University Fuzhou 350007 China
| | - Liren Xiao
- Engineering Research Center of Polymer Green Recycling of Ministry Education, Fujian Key Laboratory of Pollution Control & Resource Reuse, College of Environmental Science and Engineering, Fujian Normal University Fuzhou 350007 China
| | - Qingrong Qian
- Engineering Research Center of Polymer Green Recycling of Ministry Education, Fujian Key Laboratory of Pollution Control & Resource Reuse, College of Environmental Science and Engineering, Fujian Normal University Fuzhou 350007 China
| | - Qinghua Chen
- Engineering Research Center of Polymer Green Recycling of Ministry Education, Fujian Key Laboratory of Pollution Control & Resource Reuse, College of Environmental Science and Engineering, Fujian Normal University Fuzhou 350007 China .,Fujian Normal University, Fuqing Branch Fuzhou 350300 China
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31
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Tian X, Xuan X, Yu M, Mu Y, Lu HG, Zhang Z, Li SD. Predicting two-dimensional semiconducting boron carbides. NANOSCALE 2019; 11:11099-11106. [PMID: 31165833 DOI: 10.1039/c9nr02681a] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Carbon and boron can mix to form numerous two-dimensional (2D) compounds with strong covalent bonds, yet very few possess a bandgap for functional applications. Motivated by the structural similarity between graphene and recently synthesized borophene, we propose a new family of semiconducting boron carbide monolayers composed of B4C3 pyramids and carbon hexagons, denoted as (B4C3)m(C6)n (m, n are integers) by means of the global minimum search method augmented with first-principles calculations. These monolayers are isoelectronic to graphene yet exhibit increased bandgaps with decreasing n/m, due to the enhanced localization of boron multicenter bonding states as a consequence of the electronic transfer from boron to carbon. In particular, the B4C3 monolayer is even more stable than the previously synthesized BC3 monolayer and has a direct bandgap of 2.73 eV, with the promise for applications in optical catalysis and optoelectronics. These results are likely to inform the on-going effort on the design of semiconducting 2D materials based on other light elements.
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Affiliation(s)
- Xinxin Tian
- Institute of Molecular Science, Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province, Shanxi University, Taiyuan 030006, P. R. China.
| | - Xiaoyu Xuan
- State Key Laboratory of Mechanics and Control of Mechanical Structures, Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education and Institute of Nano Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
| | - Meng Yu
- School of chemistry and chemical engineering, Yulin University, Yulin, 719000, P. R. China
| | - Yuewen Mu
- Institute of Molecular Science, Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province, Shanxi University, Taiyuan 030006, P. R. China.
| | - Hai-Gang Lu
- Institute of Molecular Science, Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province, Shanxi University, Taiyuan 030006, P. R. China.
| | - Zhuhua Zhang
- State Key Laboratory of Mechanics and Control of Mechanical Structures, Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education and Institute of Nano Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
| | - Si-Dian Li
- Institute of Molecular Science, Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province, Shanxi University, Taiyuan 030006, P. R. China.
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32
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Zheng S, Huang C, Yu T, Xu M, Zhang S, Xu H, Liu Y, Kan E, Wang Y, Yang G. High-Temperature Ferromagnetism in an Fe 3P Monolayer with a Large Magnetic Anisotropy. J Phys Chem Lett 2019; 10:2733-2738. [PMID: 31066565 DOI: 10.1021/acs.jpclett.9b00970] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
For the development of high-performance spintronic nanodevices, one of the most urgent and challenging tasks is the preparation of two-dimensional materials with room-temperature ferromagnetism and a large magnetic anisotropic energy (MAE). Through first-principles swarm-intelligence structural search calculations, we identify an ideal ferromagnetic Fe3P monolayer, in which Fe atoms show a perfect Kagome lattice, leading to strong in-plane Fe-Fe coupling. The predicted Curie temperature of Fe3P reaches ∼420 K, and its MAE is comparable to those of ferromagnetic materials, such as Fe and Fe2Si. Moreover, the Fe3P monolayer remains as an above room-temperature ferromagnet under biaxial strains as large as 10%. Its lattice can be retained at temperatures of ≤1000 K, exhibiting a high thermodynamic stability. All of these desirable properties make the Fe3P monolayer a promising candidate for applications in spintronic nanodevices.
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Affiliation(s)
- Shuang Zheng
- Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education , Northeast Normal University , Changchun 130024 , China
| | - Chengxi Huang
- Department of Applied Physics and Institution of Energy and Microstructure , Nanjing University of Science and Technology , Nanjing , Jiangsu 210094 , P. R. China
| | - Tong Yu
- Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education , Northeast Normal University , Changchun 130024 , China
| | - Meiling Xu
- Laboratory of Quantum Materials Design and Application, School of Physics and Electronic Engineering , Jiangsu Normal University , Xuzhou 221116 , China
| | - Shoutao Zhang
- Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education , Northeast Normal University , Changchun 130024 , China
| | - Haiyang Xu
- Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education , Northeast Normal University , Changchun 130024 , China
| | - Yichun Liu
- Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education , Northeast Normal University , Changchun 130024 , China
| | - Erjun Kan
- Department of Applied Physics and Institution of Energy and Microstructure , Nanjing University of Science and Technology , Nanjing , Jiangsu 210094 , P. R. China
| | - Yanchao Wang
- State Key Laboratory of Superhard Materials, College of Physics , Jilin University , Changchun 130012 , China
| | - Guochun Yang
- Centre for Advanced Optoelectronic Functional Materials Research and Key Laboratory for UV Light-Emitting Materials and Technology of Ministry of Education , Northeast Normal University , Changchun 130024 , China
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33
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Song B, Zhou Y, Yang HM, Liao JH, Yang LM, Yang XB, Ganz E. Two-Dimensional Anti-Van’t Hoff/Le Bel Array AlB6 with High Stability, Unique Motif, Triple Dirac Cones, and Superconductivity. J Am Chem Soc 2019; 141:3630-3640. [DOI: 10.1021/jacs.8b13075] [Citation(s) in RCA: 120] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Bingyi Song
- Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica; Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education; Hubei Key Laboratory of Materials Chemistry and Service Failure; School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Yuan Zhou
- Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica; Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education; Hubei Key Laboratory of Materials Chemistry and Service Failure; School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Hui-Min Yang
- Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica; Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education; Hubei Key Laboratory of Materials Chemistry and Service Failure; School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Ji-Hai Liao
- Department of Physics, South China University of Technology, Guangzhou 510640, China
| | - Li-Ming Yang
- Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica; Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education; Hubei Key Laboratory of Materials Chemistry and Service Failure; School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Xiao-Bao Yang
- Department of Physics, South China University of Technology, Guangzhou 510640, China
| | - Eric Ganz
- School of Physics and Astronomy, University of Minnesota, 116 Church Street SE, Minneapolis, Minnesota 55455, United States
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34
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Tkachenko NV, Steglenko D, Fedik N, Boldyreva NM, Minyaev RM, Minkin VI, Boldyrev AI. Superoctahedral two-dimensional metallic boron with peculiar magnetic properties. Phys Chem Chem Phys 2019; 21:19764-19771. [DOI: 10.1039/c9cp03786a] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel two-dimensional ferromagnetic stable boron material has been predicted and exhaustively studied with DFT methods. Its magnetism can be described by the presence of two unpaired delocalized bonding elements inside each distorted octahedron.
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Affiliation(s)
| | - Dmitriy Steglenko
- Institute of Physical and Organic Chemistry
- Southern Federal University
- Rostov-on-Don
- Russian Federation
| | - Nikita Fedik
- Department of Chemistry and Biochemistry
- Utah State University
- Logan
- USA
- Institute of Physical and Organic Chemistry
| | - Natalia M. Boldyreva
- Institute of Physical and Organic Chemistry
- Southern Federal University
- Rostov-on-Don
- Russian Federation
| | - Ruslan M. Minyaev
- Institute of Physical and Organic Chemistry
- Southern Federal University
- Rostov-on-Don
- Russian Federation
| | - Vladimir I. Minkin
- Institute of Physical and Organic Chemistry
- Southern Federal University
- Rostov-on-Don
- Russian Federation
| | - Alexander I. Boldyrev
- Department of Chemistry and Biochemistry
- Utah State University
- Logan
- USA
- Institute of Physical and Organic Chemistry
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35
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Wu S, Qin L, Zhang K, Xin Z, Zhao S. Ultrathin 2D metal–organic framework nanosheets prepared via sonication exfoliation of membranes from interfacial growth and exhibition of enhanced catalytic activity by their gold nanocomposites. RSC Adv 2019; 9:9386-9391. [PMID: 35520711 PMCID: PMC9062198 DOI: 10.1039/c9ra00662a] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Accepted: 03/09/2019] [Indexed: 01/06/2023] Open
Abstract
Ultrathin two-dimensional (2D) metal–organic framework (MOF) nanosheets were prepared by a facile sonication exfoliation of MOF membranes from interfacial growth. The stacked form of nanosheets constituting the MOF membranes was significantly different to that of its layered MOF counterparts. This led to decreased interaction between nanosheets, so they could exfoliate readily from the MOF membranes. Moreover, Au nanoparticles were introduced to form nanocomposites. Enhanced catalytic activity and long-term stability of these nanocomposites were observed by a model reaction of the reduction of 4-nitrophenol to 4-aminophenol. This preparation method could be extended to other 2D MOF nanosheets and their nanocomposites. Cu-MOF nanosheets were prepared by sonication exfoliation and the Au/Cu-MOF nanocomposites exhibited higher catalytic activity than pure Au NPs.![]()
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Affiliation(s)
- Songting Wu
- Shanghai Key Laboratory of Multiphase Materials
- School of Chemical Engineering
- East China University of Science and Technology
- Shanghai
- China
| | - Lu Qin
- Shanghai Key Laboratory of Multiphase Materials
- School of Chemical Engineering
- East China University of Science and Technology
- Shanghai
- China
| | - Ke Zhang
- Shanghai Key Laboratory of Multiphase Materials
- School of Chemical Engineering
- East China University of Science and Technology
- Shanghai
- China
| | - Zhong Xin
- Shanghai Key Laboratory of Multiphase Materials
- School of Chemical Engineering
- East China University of Science and Technology
- Shanghai
- China
| | - Shicheng Zhao
- Shanghai Key Laboratory of Multiphase Materials
- School of Chemical Engineering
- East China University of Science and Technology
- Shanghai
- China
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36
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Song T, Cheong JY, Cho H, Kim ID, Jeon DY. Mixture of quantum dots and ZnS nanoparticles as emissive layer for improved quantum dots light emitting diodes. RSC Adv 2019; 9:15177-15183. [PMID: 35514803 PMCID: PMC9064264 DOI: 10.1039/c9ra01462d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2019] [Accepted: 05/04/2019] [Indexed: 11/21/2022] Open
Abstract
Recently, quantum dots based light-emitting diodes (QLEDs) have received huge attention due to the properties of quantum dots (QDs), such as high photoluminescence quantum yield (PLQY) and narrow emission. To improve the performance of QLEDs, reducing non-radiative energy transfer is critical. So far, most conventional methods required additional chemical treatment like giant shell and/or ligands exchange. However that triggers unsought shifted emission or reduced PLQY of QDs. In this work, we have firstly suggested a novel approach to improve the efficiency of QLEDs by introducing inorganic nanoparticles (NPs) spacer between QDs, without additional chemical treatment. As ZnS NPs formed a mixture layer with QDs, the energy transfer was reduced and the distance between the QDs increased, leading to improved PLQY of mixture layer. As a result, current efficiency (CE) of the QLED device was improved by twice compared with one using only QDs layer. This is an early report on utilizing ZnS NPs as an efficient spacer, which can be utilized to other compositions of QDs. Mixture of quantum dots and ZnS nanoparticles as emissive layer for improved QLEDs by decreasing energy transfer between the QDs.![]()
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Affiliation(s)
- Taeyoung Song
- Department of Materials Science and Engineering
- Korea Advanced Institute of Science and Technology
- Daejeon 305-701
- Republic of Korea
| | - Jun Young Cheong
- Department of Materials Science and Engineering
- Korea Advanced Institute of Science and Technology
- Daejeon 305-701
- Republic of Korea
| | - Hyunjin Cho
- Department of Materials Science and Engineering
- Korea Advanced Institute of Science and Technology
- Daejeon 305-701
- Republic of Korea
| | - Il-Doo Kim
- Department of Materials Science and Engineering
- Korea Advanced Institute of Science and Technology
- Daejeon 305-701
- Republic of Korea
| | - Duk Young Jeon
- Department of Materials Science and Engineering
- Korea Advanced Institute of Science and Technology
- Daejeon 305-701
- Republic of Korea
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Li F, Aeberhard U, Wu H, Qiao M, Li Y. Global minimum beryllium hydride sheet with novel negative Poisson's ratio: first-principles calculations. RSC Adv 2018; 8:19432-19436. [PMID: 35540987 PMCID: PMC9080711 DOI: 10.1039/c8ra02492h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Accepted: 05/16/2018] [Indexed: 11/21/2022] Open
Abstract
As one of the most prominent metal-hydrides, beryllium hydride has received much attention over the past several decades, since 1978, and is considered as an important hydrogen storage material. By reducing the dimensionality from 3 to 2, the beryllium hydride monolayer is isoelectronic with graphene; thus the existence of its two-dimensional (2D) form is theoretically feasible and experimentally expected. However, little is known about its 2D form. In this work, by a global minimum search with the particle swarm optimization method via density functional theory computations, we predicted two new stable structures for the beryllium hydride sheets, named α-BeH2 and β-BeH2 monolayers. Both structures have more favorable thermodynamic stability than the recently reported planar square form (Nanoscale, 2017, 9, 8740), due to the forming of multicenter delocalized Be-H bonds. Utilizing the recently developed SSAdNDP method, we revealed that three-center-two-electron (3c-2e) delocalized Be-H bonds are formed in the α-BeH2 monolayer, while for the β-BeH2 monolayer, novel four-center-two-electron (4c-2e) delocalized bonds are observed in the 2D system for the first time. These unique multicenter chemical bonds endow both α- and β-BeH2 with high structural stabilities, which are further confirmed by the absence of imaginary modes in their phonon spectra, the favorable formation energies comparable to bulk and cluster beryllium hydride, and the high mechanical strength. These results indicate the potential for experimental synthesis. Furthermore, both α- and β-BeH2 are wide-bandgap semiconductors, in which the α-BeH2 has unusual mechanical properties with a negative Poisson's ratio of -0.19. If synthesized, it would attract interest both in experiment and theory, and be a new member of the 2D family isoelectronic with graphene.
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Affiliation(s)
- Feng Li
- School of Science, Nanjing University of Posts and Telecommunications Nanjing Jiangsu 210023 China
- IEK-5 Photovoltaik, Forschungszentrum Jülich 52425 Jülich Germany
| | - Urs Aeberhard
- IEK-5 Photovoltaik, Forschungszentrum Jülich 52425 Jülich Germany
| | - Hong Wu
- School of Science, Nanjing University of Posts and Telecommunications Nanjing Jiangsu 210023 China
| | - Man Qiao
- College of Chemistry and Materials Science, Jiangsu Key Laboratory of Biofunctional Materials, Nanjing Normal University Nanjing 210023 China
| | - Yafei Li
- College of Chemistry and Materials Science, Jiangsu Key Laboratory of Biofunctional Materials, Nanjing Normal University Nanjing 210023 China
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38
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Meng L, Zhang Y, Zhang J, Wu W. Completely flat 2D Zn 3O 2 monolayer with triangle and pentangle coordinated networks. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2018; 30:095301. [PMID: 29417933 DOI: 10.1088/1361-648x/aaa8c8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Two-dimensional (2D) materials with strictly planar hyper-coordinated motifs are of great importance in fundamental science and potential applications but extremely rare. Here we theoretically design a novel 2D IIB-VIA inorganic system, namely Zn3O2 monolayer, by comprehensive first-principles computations. This Zn3O2 monolayer is composed from highly symmetrical tri-coordinated oxygen and tetra-coordinated zinc, featuring planar and peculiar triangle and pentangle combined bonded network. The newly predicted Zn3O2 monolayer possesses excellent dynamic and thermal stabilities and is also the lowest-energy structure of its 2D space indicated by particle swarm search, supporting its experimentally synthetic viability. A relatively wide band gap of 4.46 eV means it has potential applications in electronics and optoelectronics. The present findings provide a new field of hyper-coordinated 2D nanomaterials for study.
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Affiliation(s)
- Lingbiao Meng
- Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, People's Republic of China. Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, People's Republic of China
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39
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Unsal E, Iyikanat F, Sahin H, Senger RT. Hydrogenated derivatives of hexacoordinated metallic Cu2Si monolayer. RSC Adv 2018; 8:39976-39982. [PMID: 35558203 PMCID: PMC9091276 DOI: 10.1039/c8ra07824f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Accepted: 11/24/2018] [Indexed: 11/21/2022] Open
Abstract
Herein, we carried out first-principles calculations based on density functional theory to investigate the effects of surface functionalization with hydrogen atoms on structural, dynamical and electronic properties of Cu2Si monolayer. Pristine Cu2Si, a metallic monolayer, has a planar hexacoordinate structure. Calculations revealed that the most favorable position of a single H atom on the Cu2Si monolayer is at the top of a Si site. Derivatives of Cu2Si monolayer with various H concentrations were investigated, and by performing phonon calculations, it was found that there are three stable hydrogenated structures. Specific heat of these monolayers was found to increase with the hydrogen concentration at temperatures higher than 100 K. Electronically, the hydrogenated derivatives of Cu2Si monolayer preserve the metallic character. Herein, we carried out first-principles calculations based on density functional theory to investigate the effects of surface functionalization with hydrogen atoms on structural, dynamical and electronic properties of Cu2Si monolayer.![]()
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Affiliation(s)
- E. Unsal
- Department of Physics
- Izmir Institute of Technology
- Izmir
- Turkey
| | - F. Iyikanat
- Department of Physics
- Izmir Institute of Technology
- Izmir
- Turkey
| | - H. Sahin
- Department of Photonics
- Izmir Institute of Technology
- Izmir
- Turkey
- ICTP-ECAR Eurasian Center for Advanced Research
| | - R. T. Senger
- Department of Physics
- Izmir Institute of Technology
- Izmir
- Turkey
- ICTP-ECAR Eurasian Center for Advanced Research
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40
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Qu X, Yang J, Wang Y, Lv J, Chen Z, Ma Y. A two-dimensional TiB 4 monolayer exhibits planar octacoordinate Ti. NANOSCALE 2017; 9:17983-17990. [PMID: 29130460 DOI: 10.1039/c7nr05688e] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
At present, the concept of planar hypercoordination in chemistry meets the fast development of two-dimensional (2D) nanomaterials, leading to considerable interest in searching for 2D materials with planar hypercoordinate atoms. In this work, by means of the swarm-intelligence structure search method and first-principles calculations, we predict a hitherto unknown 2D TiB4 monolayer with a planar octacoordinate Ti moiety, in which each Ti atom binds to eight B atoms with equal distances in a perfect plane, and has the highest coordination of Ti known for 2D materials thus far. Systematic ab initio calculations demonstrate the superior thermodynamic and dynamic stabilities of the predicted TiB4 monolayer, indicating the high feasibility for experimental synthesis. The stabilization of this perfect planar structure originates from the geometric fit between the atomic radius of Ti and the size of the 8-membered B ring, as well as the electron transfer from Ti to B atoms which compensates the electron deficiency of the full sp2 hybridized B network. Motivated by the unforeseen geometry of the TiB4 monolayer, a series of other 2D transition metal borides (TMB4, TM = V, Cr, Mo, W and Os) with quasi-planar octacoordinate TM atoms are further designed and discussed. The present work provides a useful roadmap for the discovery of 2D hypercoordinate materials.
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Affiliation(s)
- Xin Qu
- Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, P. R. China
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41
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Sun Y, Zhuo Z, Wu X, Yang J. Room-Temperature Ferromagnetism in Two-Dimensional Fe 2Si Nanosheet with Enhanced Spin-Polarization Ratio. NANO LETTERS 2017; 17:2771-2777. [PMID: 28441496 DOI: 10.1021/acs.nanolett.6b04884] [Citation(s) in RCA: 73] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Searching experimental feasible two-dimensional (2D) ferromagnetic crystals with large spin-polarization ratio, high Curie temperature and large magnetic anisotropic energy is one key to develop next-generation spintronic nanodevices. Here, 2D Fe2Si nanosheet, one counterpart of Hapkeite mineral discovered in meteorite with novel magnetism is proposed on the basis of first-principles calculations. The 2D Fe2Si crystal has a slightly buckled triangular lattice with planar hexacoordinated Si and Fe atoms. The spin-polarized calculations with hybrid HSE06 function method indicate that 2D Fe2Si is a ferromagnetic half metal at its ground state with 100% spin-polarization ratio at Fermi energy level. The phonon spectrum calculation and ab initio molecular dynamic simulation shows that 2D Fe2Si crystal has a high thermodynamic stability and its 2D lattice can be retained at the temperature up to 1200 K. Monte Carlo simulations based on the Ising model predict a Curie temperature over 780 K in 2D Fe2Si crystal, which can be further tuned by applying a biaxial strain. Moreover, 2D structure and strong in-plane Fe-Fe interaction endow Fe2Si nanosheet sizable magnetocrystalline anisotropy energy with the magnitude of at least two orders larger than those of Fe, Co and Ni bulks. These novel magnetic properties render the 2D Fe2Si crystal a very promising material for developing practical spintronic nanodevices.
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Affiliation(s)
- Yingjie Sun
- CAS Key Laboratory of Materials for Energy Conversion, School of Chemistry and Materials Sciences, and CAS Center for Excellence in Nanoscience, ‡Hefei National Laboratory for Physical Science at the Microscale, and §Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China , Hefei, Anhui 230026, China
| | - Zhiwen Zhuo
- CAS Key Laboratory of Materials for Energy Conversion, School of Chemistry and Materials Sciences, and CAS Center for Excellence in Nanoscience, ‡Hefei National Laboratory for Physical Science at the Microscale, and §Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China , Hefei, Anhui 230026, China
| | - Xiaojun Wu
- CAS Key Laboratory of Materials for Energy Conversion, School of Chemistry and Materials Sciences, and CAS Center for Excellence in Nanoscience, ‡Hefei National Laboratory for Physical Science at the Microscale, and §Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China , Hefei, Anhui 230026, China
| | - Jinlong Yang
- CAS Key Laboratory of Materials for Energy Conversion, School of Chemistry and Materials Sciences, and CAS Center for Excellence in Nanoscience, ‡Hefei National Laboratory for Physical Science at the Microscale, and §Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China , Hefei, Anhui 230026, China
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42
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Zhang H, Li Y, Hou J, Du A, Chen Z. Dirac State in the FeB 2 Monolayer with Graphene-Like Boron Sheet. NANO LETTERS 2016; 16:6124-6129. [PMID: 27580054 DOI: 10.1021/acs.nanolett.6b02335] [Citation(s) in RCA: 91] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
By introducing the commonly utilized Fe atoms into a two-dimensional (2D) honeycomb boron network, we theoretically designed a new Dirac material of FeB2 monolayer with a Fermi velocity in the same order of graphene. The electron transfer from Fe atoms to B networks not only effectively stabilizes the FeB2 networks but also leads to the strong interaction between the Fe and B atoms. The Dirac state in FeB2 system primarily arises from the Fe d orbitals and hybridized orbital from Fe-d and B-p states. The newly predicted FeB2 monolayer has excellent dynamic and thermal stabilities and is also the global minimum of 2D FeB2 system, implying its experimental feasibility. Our results are beneficial to further uncovering the mechanism of the Dirac cones and providing a feasible strategy for Dirac materials design.
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Affiliation(s)
- Haijun Zhang
- Department of Chemistry, Institute for Functional Nanomaterials, University of Puerto Rico , Rio Piedras Campus, San Juan, Puerto Rico 00931, United States
- School of Physics and Materials Science, Anhui University , Hefei 230601, China
| | - Yafei Li
- College of Chemistry and Materials Science, Jiangsu Key Laboratory of Biofunctional Materials, Nanjing Normal University , Nanjing, Jingsu 210023, China
| | - Jianhou Hou
- Department of Chemistry, Institute for Functional Nanomaterials, University of Puerto Rico , Rio Piedras Campus, San Juan, Puerto Rico 00931, United States
| | - Aijun Du
- School of Chemistry, Physics and Mechanical Engineering Faculty, Queensland University of Technology , Garden Point Campus, Brisbane, Queensland 4001, Australia
| | - Zhongfang Chen
- Department of Chemistry, Institute for Functional Nanomaterials, University of Puerto Rico , Rio Piedras Campus, San Juan, Puerto Rico 00931, United States
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43
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Wang Y, Li F, Li Y, Chen Z. Semi-metallic Be5C2 monolayer global minimum with quasi-planar pentacoordinate carbons and negative Poisson's ratio. Nat Commun 2016; 7:11488. [PMID: 27139572 PMCID: PMC4857406 DOI: 10.1038/ncomms11488] [Citation(s) in RCA: 124] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Accepted: 04/01/2016] [Indexed: 12/23/2022] Open
Abstract
Designing new materials with novel topological properties and reduced dimensionality is always desirable for material innovation. Here we report the design of a two-dimensional material, namely Be5C2 monolayer on the basis of density functional theory computations. In Be5C2 monolayer, each carbon atom binds with five beryllium atoms in almost the same plane, forming a quasi-planar pentacoordinate carbon moiety. Be5C2 monolayer appears to have good stability as revealed by its moderate cohesive energy, positive phonon modes and high melting point. It is the lowest-energy structure with the Be5C2 stoichiometry in two-dimensional space and therefore holds some promise to be realized experimentally. Be5C2 monolayer is a gapless semiconductor with a Dirac-like point in the band structure and also has an unusual negative Poisson's ratio. If synthesized, Be5C2 monolayer may find applications in electronics and mechanics.
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Affiliation(s)
- Yu Wang
- College of Chemistry and Materials Science, Jiangsu Key Laboratory of Biofunctional Materials, Nanjing Normal University, Nanjing, Jiangsu 210023, China
| | - Feng Li
- College of Chemistry and Materials Science, Jiangsu Key Laboratory of Biofunctional Materials, Nanjing Normal University, Nanjing, Jiangsu 210023, China
| | - Yafei Li
- College of Chemistry and Materials Science, Jiangsu Key Laboratory of Biofunctional Materials, Nanjing Normal University, Nanjing, Jiangsu 210023, China
| | - Zhongfang Chen
- Department of Chemistry, Institute for Functional Nanomaterials, University of Puerto Rico, Rio Piedras Campus, San Juan, Puerto Rico 00931, USA
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44
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Zhang H, Li Y, Hou J, Tu K, Chen Z. FeB6 Monolayers: The Graphene-like Material with Hypercoordinate Transition Metal. J Am Chem Soc 2016; 138:5644-51. [DOI: 10.1021/jacs.6b01769] [Citation(s) in RCA: 177] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Haijun Zhang
- Department
of Chemistry, Institute for Functional Nanomaterials, University of Puerto Rico, Rio Piedras Campus, San Juan, Puerto Rico 00931, United States
| | - Yafei Li
- College
of Chemistry and Materials Science, Jiangsu Key Laboratory of Biofunctional
Materials, Nanjing Normal University, Nanjing, Jiangsu 210046, China
| | - Jianhua Hou
- Department
of Chemistry, Institute for Functional Nanomaterials, University of Puerto Rico, Rio Piedras Campus, San Juan, Puerto Rico 00931, United States
| | - Kaixiong Tu
- Department
of Chemistry, Institute for Functional Nanomaterials, University of Puerto Rico, Rio Piedras Campus, San Juan, Puerto Rico 00931, United States
| | - Zhongfang Chen
- Department
of Chemistry, Institute for Functional Nanomaterials, University of Puerto Rico, Rio Piedras Campus, San Juan, Puerto Rico 00931, United States
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45
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Sui JJ, Xu J, Ding YH. A template for a planar tetracoordinate heavier group 14 atom: a global study of C2Si2X(q) (X = C, Si, Ge, Sn, Pb; q = +1, 0, -1). Dalton Trans 2016; 45:56-60. [PMID: 26605837 DOI: 10.1039/c5dt03989d] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Through a global isomeric study, we computationally identified the first structural template C2Si2X that could encompass a planar tetracoordinate X for all the heavier group 14 elements X in the 0, +1 or -1 charge state. We thus significantly expanded the traditional 16/17/18ve rules to 19/20/21ve for ptX.
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Affiliation(s)
- Jing-jing Sui
- Institute of Theoretical Chemistry, Jilin University, Changchun 130023, People's Republic of China.
| | - Jing Xu
- Institute of Theoretical Chemistry, Jilin University, Changchun 130023, People's Republic of China.
| | - Yi-hong Ding
- Institute of Theoretical Chemistry, Jilin University, Changchun 130023, People's Republic of China.
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46
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Saha B, Bhattacharyya PK. Understanding reactivity, aromaticity and absorption spectra of carbon cluster mimic to graphene: a DFT study. RSC Adv 2016. [DOI: 10.1039/c6ra15016k] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Effect of doping B and/or N on the reactivity, aromaticity and absorption spectra of graphene and functionalized (–OH and –COOH) carbon cluster mimicking graphene is studied using DFT, DFRT and TD-DFT.
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Affiliation(s)
- Bapan Saha
- Department of Chemistry
- Arya Vidyapeeth College
- Guwahati-781016
- India
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47
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Yang LM, Ganz E. Adding a new dimension to the chemistry of phosphorus and arsenic. Phys Chem Chem Phys 2016; 18:17586-91. [DOI: 10.1039/c6cp01860b] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We predict two novel highly stable free-standing 2D monolayers of P and As alloyed with Cu (Cu2X) that have exotic hypercoordination motifs. These are the first predicted hexacoordinate P and planar hexacoordinate As extended alloy sheets.
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Affiliation(s)
- Li-Ming Yang
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
- China
| | - Eric Ganz
- Department of Physics
- University of Minnesota
- Minneapolis
- USA
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48
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Yu X, Oganov AR, Popov IA, Boldyrev AI. d-AO spherical aromaticity in Ce6O8. J Comput Chem 2015; 37:103-9. [DOI: 10.1002/jcc.24049] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2015] [Revised: 07/22/2015] [Accepted: 07/23/2015] [Indexed: 01/10/2023]
Affiliation(s)
- Xiaohu Yu
- Department of Problems of Physics and Energetics; Moscow Institute of Physics and Technology; 9 Institutskiy Land Dolgoprudny City Moscow Region 141700 Russia
| | - Artem R. Oganov
- Department of Problems of Physics and Energetics; Moscow Institute of Physics and Technology; 9 Institutskiy Land Dolgoprudny City Moscow Region 141700 Russia
- Skolkovo Institute of Science and Technology; Skolkovo Innovation Center, 5 Nobel St. Moscow 143026 Russia
- Department of Geosciences and Center for Materials by Design; Stony Brook University; Stony Brook New York 11794
- International Center for Materials Discovery, School of Materials Science; Northwestern Polytechnical University; Xi'an 720072 China
| | - Ivan A. Popov
- Department of Chemistry and Biochemistry; Utah State University; Logan Utah 84322
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49
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Tang ZK, Liu WW, Zhang DY, Lau WM, Liu LM. Tunable band gap and magnetism of the two-dimensional nickel hydroxide. RSC Adv 2015. [DOI: 10.1039/c5ra10380k] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The electronic structures and magnetic properties of two dimensional (2D) hexagonal Ni(OH)2 are explored based on first-principles calculations.
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Affiliation(s)
- Zhen-Kun Tang
- Beijing Computational Science Research Center
- Beijing 100084
- China
- College of Physics and Electronics Engineering
- Hengyang Normal University
| | - Wei-Wei Liu
- Beijing Computational Science Research Center
- Beijing 100084
- China
| | - Deng-Yu Zhang
- College of Physics and Electronics Engineering
- Hengyang Normal University
- Hengyang 421008
- China
| | - Woon-Ming Lau
- Beijing Computational Science Research Center
- Beijing 100084
- China
- Chengdu Green Energy and Green Manufacturing Technology R&D Center
- Chengdu
| | - Li-Min Liu
- Beijing Computational Science Research Center
- Beijing 100084
- China
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50
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Yang LM, Popov IA, Frauenheim T, Boldyrev AI, Heine T, Bačić V, Ganz E. Revealing unusual chemical bonding in planar hyper-coordinate Ni2Ge and quasi-planar Ni2Si two-dimensional crystals. Phys Chem Chem Phys 2015; 17:26043-8. [DOI: 10.1039/c5cp04893a] [Citation(s) in RCA: 78] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
We predict two novel highly stable 2D planar hexacoordinate monolayer sheets Ni2Si and Ni2Ge with unusual chemical bonding.
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Affiliation(s)
- Li-Ming Yang
- Bremen Center for Computational Materials Science
- University of Bremen
- Bremen
- Germany
| | - Ivan A. Popov
- Department of Chemistry and Biochemistry
- Utah State University
- Logan
- USA
| | - Thomas Frauenheim
- Bremen Center for Computational Materials Science
- University of Bremen
- Bremen
- Germany
| | | | - Thomas Heine
- School of Eingineering and Science
- Jacobs University Bremen
- 28759 Bremen
- Germany
| | - Vladimir Bačić
- School of Eingineering and Science
- Jacobs University Bremen
- 28759 Bremen
- Germany
| | - Eric Ganz
- Department of Physics
- University of Minnesota
- Minneapolis
- USA
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