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Yalovega GE, Brzhezinskaya M, Dmitriev VO, Shmatko VA, Ershov IV, Ulyankina AA, Chernysheva DV, Smirnova NV. Interfacial Interaction in MeO x/MWNTs (Me-Cu, Ni) Nanostructures as Efficient Electrode Materials for High-Performance Supercapacitors. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:947. [PMID: 38869571 PMCID: PMC11173771 DOI: 10.3390/nano14110947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2024] [Revised: 05/24/2024] [Accepted: 05/26/2024] [Indexed: 06/14/2024]
Abstract
Due to their unique physical and chemical properties, complex nanostructures based on carbon nanotubes and transition metal oxides are considered promising electrode materials for the fabrication of high-performance supercapacitors with a fast charge rate, high power density, and long cycle life. The crucial role in determining their efficiency is played by the properties of the interface in such nanostructures, among them, the type of chemical bonds between their components. The complementary theoretical and experimental methods, including dispersion-corrected density functional theory (DFT-D3) within GGA-PBE approximation, scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman, X-ray photoelectron, and X-ray absorption spectroscopies, were applied in the present work for the comprehensive investigation of surface morphology, structure, and electronic properties in CuOx/MWCNTs and NiOx/MWCNTs. As a result, the type of interfacial interaction and its correlation with electrochemical characteristics were determined. It was found that the presence of both Ni-O-C and Ni-C bonds can increase the contact between NiO and MWCNTs, and, through this, promote electron transfer between NiO and MWCNTs. For NiOx/MWCNTs, better electrochemical characteristics were observed than for CuOx/MWCNTs, in which the interfacial interaction is determined only by bonding through Cu-O-C bonds. The electrochemical properties of CuOx/MWCNTs and NiOx/MWCNTs were studied to demonstrate the effect of interfacial interaction on their efficiency as electrode materials for supercapacitor applications.
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Affiliation(s)
- Galina E. Yalovega
- Faculty of Physics, Southern Federal University, 344090 Rostov-on-Don, Russia; (V.O.D.); (V.A.S.)
| | - Maria Brzhezinskaya
- Helmholtz-Zentrum Berlin für Materialien und Energie, 12489 Berlin, Germany;
| | - Victor O. Dmitriev
- Faculty of Physics, Southern Federal University, 344090 Rostov-on-Don, Russia; (V.O.D.); (V.A.S.)
| | - Valentina A. Shmatko
- Faculty of Physics, Southern Federal University, 344090 Rostov-on-Don, Russia; (V.O.D.); (V.A.S.)
| | - Igor V. Ershov
- Department of Physics, Don State Technical University, 344000 Rostov-on-Don, Russia;
| | - Anna A. Ulyankina
- Research Institute “Nanotechnologies and New Materials”, Platov South-Russian State Polytechnic University, 346428 Novocherkassk, Russia; (A.A.U.); (D.V.C.); (N.V.S.)
| | - Daria V. Chernysheva
- Research Institute “Nanotechnologies and New Materials”, Platov South-Russian State Polytechnic University, 346428 Novocherkassk, Russia; (A.A.U.); (D.V.C.); (N.V.S.)
| | - Nina V. Smirnova
- Research Institute “Nanotechnologies and New Materials”, Platov South-Russian State Polytechnic University, 346428 Novocherkassk, Russia; (A.A.U.); (D.V.C.); (N.V.S.)
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Pela RR, Hsiao CL, Hultman L, Birch J, Gueorguiev GK. Electronic and optical properties of core-shell InAlN nanorods: a comparative study via LDA, LDA-1/2, mBJ, HSE06, G0W0 and BSE methods. Phys Chem Chem Phys 2024; 26:7504-7514. [PMID: 38357814 DOI: 10.1039/d3cp05295h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2024]
Abstract
Currently, self-induced InAlN core-shell nanorods enjoy an advanced stage of accumulation of experimental data from their growth and characterization as well as a comprehensive understanding of their formation mechanism by the ab initio modeling based on Synthetic Growth Concept. However, their electronic and optical properties, on which most of their foreseen applications are expected to depend, have not been investigated comprehensively. GW and the Bethe-Salpeter equation (BSE) are regarded as the state-of-the-art ab initio methodologies to study these properties. However, one of the major drawbacks of these methods is the computational cost, much higher than density-functional theory (DFT). Therefore, in many applications, it is highly desirable to answer the question of how well approaches based on DFT, such as e.g. the local density approximation (LDA), LDA-1/2, the modified Becke-Johnson (mBJ) and the Heyd-Scuseria-Ernzerhof (HSE06) functionals, can be employed to calculate electronic and optical properties with reasonable accuracy. In the present paper, we address this question, investigating how effective the DFT-based methodologies LDA, LDA-1/2, mBJ and HSE06 can be used as approximate tools in studies of the electronic and optical properties of scaled down models of core-shell InAlN nanorods, thus, avoiding GW and BSE calculations.
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Affiliation(s)
- Ronaldo Rodrigues Pela
- Supercomputing Department, Zuse Institute Berlin (ZIB), Takustraße 7, 14195 Berlin, Germany.
| | - Ching-Lien Hsiao
- Thin film Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, SE 581 83 Linköping, Sweden
| | - Lars Hultman
- Thin film Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, SE 581 83 Linköping, Sweden
| | - Jens Birch
- Thin film Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, SE 581 83 Linköping, Sweden
| | - Gueorgui Kostov Gueorguiev
- Thin film Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, SE 581 83 Linköping, Sweden
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3
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Zhao X, Meng K, Niu Y, Ming S, Rong J, Yu X, Zhang Y. Surface/interfacial transport through pores control desalination mechanisms in 2D carbon-based membranes. Phys Chem Chem Phys 2023; 25:30296-30307. [PMID: 37930335 DOI: 10.1039/d3cp03133k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2023]
Abstract
The shortage of freshwater is a critical concern for contemporary society, and reverse osmosis desalination technology has gathered considerable attention as a potential solution to this problem. It has been recognized that the desalination process involving water flow through angstrom-sized pores has tremendous potential. However, it is challenging to obtain angstrom-sized pore structures with internal mass transfer and surface/interface properties matching the application conditions. Herein, a two-dimensional (2D) zeolite-like carbon structure (Carzeo-ANG) was constructed with unique angstrom-sized pores in the zeolite structure; then, the surface/interfacial transport behavior and percolation effect of the Carzeo-ANG desalination membrane were evaluated by density functional theory (DFT) calculations and classical molecular dynamics. The first-principles calculations in density functional theory were implemented through the Vienna ab initio simulation package (VASP), which is a commercial package for the simulation of carbon-based materials. The results show that Carzeo-ANG is periodically distributed with angstrom-sized pores (effective diameter = 5.4 Å) of dodecacyclic carbon rings, which ensure structural stability while maintaining sufficient mechanical strength. The remarkable salt-ion adsorption properties and mass transfer activity combined with the reasonable density distribution and free energy barrier for water molecules endow the membrane with superior desalination ability. At the pressure of 80 MPa, the rejection efficiency of Cl- and Na+ were 100% and 96.25%, and the membrane could achieve a water flux of 132.71 L cm-2 day-1 MPa-1. Moreover, the interconnected electronic structure of Carzeo-ANG imparts a self-cleaning effect.
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Affiliation(s)
- Xiaoyang Zhao
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China.
| | - Kun Meng
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China.
| | - Yutao Niu
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China.
| | - Sen Ming
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China.
| | - Ju Rong
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China.
| | - Xiaohua Yu
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China.
| | - Yannan Zhang
- National and Local Joint Engineering Laboratory for Lithium-ion Batteries and Materials Preparation Technology, Kunming University of Science and Technology, Kunming 650093, China
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Bai H, Li J, Gao J, Ni J, Bai Y, Jian J, Zhao L, Bai B, Cai Z, He J, Chen H, Leng X, Liu X. Comparison of CrN Coatings Prepared Using High-Power Impulse Magnetron Sputtering and Direct Current Magnetron Sputtering. MATERIALS (BASEL, SWITZERLAND) 2023; 16:6303. [PMID: 37763579 PMCID: PMC10532976 DOI: 10.3390/ma16186303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Revised: 09/13/2023] [Accepted: 09/14/2023] [Indexed: 09/29/2023]
Abstract
Chromium Nitride (CrN) coatings have widespread utilization across numerous industrial applications, primarily attributed to their excellent properties. Among the different methods for CrN coating synthesis, direct current magnetron sputtering (DCMS) has been the dominant technique applied. Nonetheless, with the expanded applications of CrN coatings, the need for enhanced mechanical performance is concurrently escalating. High-power impulse magnetron sputtering (HiPIMS), an innovative coating deposition approach developed over the past three decades, is gaining recognition for its capability of yielding coatings with superior mechanical attributes, thereby drawing significant research interest. Considering that the mechanical performance of a coating is fundamentally governed by its microstructural properties, a comprehensive review of CrN coatings fabricated through both techniques is presented. This review of recent literature aims to embark on an insightful comparison between DCMS and HiPIMS, followed by an examination of the microstructure of CrN coatings fabricated via both techniques. Furthermore, the exploration of the underlying factors contributing to the disparities in mechanical properties observed in CrN coatings is revealed. An assessment of the advantages and potential shortcomings of HiPIMS is discussed, offering insight into CrN coating fabrication.
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Affiliation(s)
- Heda Bai
- School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China; (H.B.); (J.N.)
| | - Jin Li
- Institute of Special Environments Physical Sciences, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China; (J.G.); (Y.B.); (J.J.); (L.Z.); (B.B.); (Z.C.); (J.H.); (H.C.)
| | - Jialai Gao
- Institute of Special Environments Physical Sciences, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China; (J.G.); (Y.B.); (J.J.); (L.Z.); (B.B.); (Z.C.); (J.H.); (H.C.)
| | - Jinyang Ni
- School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China; (H.B.); (J.N.)
| | - Yaxiong Bai
- Institute of Special Environments Physical Sciences, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China; (J.G.); (Y.B.); (J.J.); (L.Z.); (B.B.); (Z.C.); (J.H.); (H.C.)
| | - Jie Jian
- Institute of Special Environments Physical Sciences, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China; (J.G.); (Y.B.); (J.J.); (L.Z.); (B.B.); (Z.C.); (J.H.); (H.C.)
| | - Lin Zhao
- Institute of Special Environments Physical Sciences, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China; (J.G.); (Y.B.); (J.J.); (L.Z.); (B.B.); (Z.C.); (J.H.); (H.C.)
| | - Bowen Bai
- Institute of Special Environments Physical Sciences, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China; (J.G.); (Y.B.); (J.J.); (L.Z.); (B.B.); (Z.C.); (J.H.); (H.C.)
| | - Zeyun Cai
- Institute of Special Environments Physical Sciences, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China; (J.G.); (Y.B.); (J.J.); (L.Z.); (B.B.); (Z.C.); (J.H.); (H.C.)
| | - Jianchao He
- Institute of Special Environments Physical Sciences, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China; (J.G.); (Y.B.); (J.J.); (L.Z.); (B.B.); (Z.C.); (J.H.); (H.C.)
| | - Hongsheng Chen
- Institute of Special Environments Physical Sciences, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China; (J.G.); (Y.B.); (J.J.); (L.Z.); (B.B.); (Z.C.); (J.H.); (H.C.)
| | - Xuesong Leng
- Institute of Special Environments Physical Sciences, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China; (J.G.); (Y.B.); (J.J.); (L.Z.); (B.B.); (Z.C.); (J.H.); (H.C.)
| | - Xiangli Liu
- School of Materials Science and Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China; (H.B.); (J.N.)
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Ren CY, Paudel RK, Chang YC. Density Functional Theory for Buckyballs within Symmetrized Icosahedral Basis. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:1912. [PMID: 37446428 DOI: 10.3390/nano13131912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 06/18/2023] [Accepted: 06/21/2023] [Indexed: 07/15/2023]
Abstract
We have developed a highly efficient computation method based on density functional theory (DFT) within a set of fully symmetrized basis functions for the C60 buckyball, which possesses the icosahedral (Ih) point-group symmetry with 120 symmetry operations. We demonstrate that our approach is much more efficient than the conventional approach based on three-dimensional plane waves. When applied to the calculation of optical transitions, our method is more than one order of magnitude faster than the existing DFT package with a conventional plane-wave basis. This makes it very convenient for modeling optical and transport properties of quantum devices related to buckyball crystals. The method introduced here can be easily extended to other fullerene-like materials.
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Affiliation(s)
- Chung-Yuan Ren
- Department of Physics, National Kaohsiung Normal University, Kaohsiung 824, Taiwan
| | - Raj Kumar Paudel
- Research Center for Applied Sciences, Academia Sinica, Taipei 115, Taiwan
- Molecular Science and Technology, Taiwan International Graduate Program, Academia Sinica, Taipei 115, Taiwan
- Department of Physics, National Central University, Chungli 320, Taiwan
| | - Yia-Chung Chang
- Research Center for Applied Sciences, Academia Sinica, Taipei 115, Taiwan
- Department of Physics, National Cheng-Kung University, Tainan 701, Taiwan
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6
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Alves Machado Filho M, Hsiao CL, dos Santos RB, Hultman L, Birch J, Gueorguiev GK. Self-Induced Core-Shell InAlN Nanorods: Formation and Stability Unraveled by Ab Initio Simulations. ACS NANOSCIENCE AU 2023; 3:84-93. [PMID: 37101465 PMCID: PMC10125348 DOI: 10.1021/acsnanoscienceau.2c00041] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Revised: 10/14/2022] [Accepted: 10/14/2022] [Indexed: 04/28/2023]
Abstract
By addressing precursor prevalence and energetics using the DFT-based synthetic growth concept (SGC), the formation mechanism of self-induced InAlN core-shell nanorods (NRs) synthesized by reactive magnetron sputter epitaxy (MSE) is explored. The characteristics of In- and Al-containing precursor species are evaluated considering the thermal conditions at a typical NR growth temperature of around 700 °C. The cohesive and dissociation energies of In-containing precursors are consistently lower than those of their Al-containing counterparts, indicating that In-containing precursors are more weakly bonded and more prone to dissociation. Therefore, In-containing species are expected to exhibit lower abundance in the NR growth environment. At increased growth temperatures, the depletion of In-based precursors is even more pronounced. A distinctive imbalance in the incorporation of Al- and In-containing precursor species (namely, AlN/AlN+, AlN2/AlN2 +, Al2N2/Al2N2 +, and Al2/Al2 + vs InN/InN+, InN2/InN2 +, In2N2/In2N2 +, and In2/In2 +) is found at the growing edge of the NR side surfaces, which correlates well with the experimentally obtained core-shell structure as well as with the distinctive In-rich core and vice versa for the Al-rich shell. The performed modeling indicates that the formation of the core-shell structure is substantially driven by the precursors' abundance and their preferential bonding onto the growing edge of the nanoclusters/islands initiated by phase separation from the beginning of the NR growth. The cohesive energies and the band gaps of the NRs show decreasing trends with an increment in the In concentration of the NRs' core and with an increment in the overall thickness (diameter) of the NRs. These results reveal the energy and electronic reasons behind the limited growth (up to ∼25% of In atoms of all metal atoms, i.e., In x Al1-x N, x ∼ 0.25) in the NR core and may be qualitatively perceived as a limiting factor for the thickness of the grown NRs (typically <50 nm).
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Affiliation(s)
- Manoel Alves Machado Filho
- Thin
Film Physics Division, Department of Physics, Chemistry, and Biology
(IFM), Linköping University, SE 581 83Linköping, Sweden
- Universidade
Maurício de Nassau − UNINASSAU − Unidade Vitória
da Conquista, 45020-750Vitória da Conquista, Bahia, Brazil
| | - Ching-Lien Hsiao
- Thin
Film Physics Division, Department of Physics, Chemistry, and Biology
(IFM), Linköping University, SE 581 83Linköping, Sweden
| | | | - Lars Hultman
- Thin
Film Physics Division, Department of Physics, Chemistry, and Biology
(IFM), Linköping University, SE 581 83Linköping, Sweden
| | - Jens Birch
- Thin
Film Physics Division, Department of Physics, Chemistry, and Biology
(IFM), Linköping University, SE 581 83Linköping, Sweden
| | - Gueorgui K. Gueorguiev
- Thin
Film Physics Division, Department of Physics, Chemistry, and Biology
(IFM), Linköping University, SE 581 83Linköping, Sweden
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7
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Bibi S, Sarfaraz S, Yar M, Iqbal Zaman M, Niaz A, Khan A, Ali Hashmi M, Ayub K. Structure and electronic characterization of pristine and functionalized single wall carbon nanotube interacting with sulfide ion: A density functional theory approach. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120144] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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8
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Serafini P, Milani A, Tommasini M, Castiglioni C, Proserpio DM, Bottani CE, Casari CS. Vibrational properties of graphdiynes as 2D carbon materials beyond graphene. Phys Chem Chem Phys 2022; 24:10524-10536. [PMID: 35442257 PMCID: PMC9425158 DOI: 10.1039/d2cp00980c] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
Two-dimensional (2D) hybrid sp–sp2 carbon systems are an appealing subject for science and technology. For these materials, topology and structure significantly affect electronic and vibrational properties. We investigate here by periodic density-functional theory (DFT) calculations the Raman and IR spectra of 2D carbon crystals belonging to the family of graphdiynes (GDYs) and having different structures and topologies. By joining DFT calculations with symmetry analysis, we assign the IR and Raman modes in the spectra of all the investigated systems. On this basis, we discuss how the modulation of the Raman and IR active bands depends on the different interactions between sp and sp2 domains. The symmetry-based classification allows identifying the marker bands sensitive to the different peculiar topologies. These results show the effectiveness of vibrational spectroscopy for the characterization of new nanostructures, deepening the knowledge of the subtle interactions that take place in these 2D materials. Raman and IR spectra investigation of 2D carbon crystals belonging to the family of graphdiynes (GDYs) and having different structures is performed in this paper, focusing on how these spectra are affected by different topological features.![]()
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Affiliation(s)
- P Serafini
- Department of Energy, Politecnico di Milano, Via Ponzio 23/3, 20133 Milan, Italy.
| | - A Milani
- Department of Energy, Politecnico di Milano, Via Ponzio 23/3, 20133 Milan, Italy.
| | - M Tommasini
- Department of Chemistry, Materials and Chem. Eng. 'G.Natta', Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milan, Italy
| | - C Castiglioni
- Department of Chemistry, Materials and Chem. Eng. 'G.Natta', Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milan, Italy
| | - D M Proserpio
- Dipartimento di Chimica, Università degli Studi di Milano, 20133 Milano, Italy
| | - C E Bottani
- Department of Energy, Politecnico di Milano, Via Ponzio 23/3, 20133 Milan, Italy.
| | - C S Casari
- Department of Energy, Politecnico di Milano, Via Ponzio 23/3, 20133 Milan, Italy.
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10
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Abstract
Brazing was one of the earliest material-joining methods to be invented and widely used by humans. In the past 30 years, the technology and materials employed for brazing have developed rapidly and continuously. With the rise of the international new industrial revolution, the manufacturing industry is moving towards diversification, and brazing filler metals are also evolving in the direction of eco-friendliness, compounding and diversification. In the “carbon neutral” environment of 2021, green composite brazing materials will become mainstream. In this paper, the classification and characteristics of flux-containing brazing materials are summarized, and the preparation technology, composition design and typical application of composite brazing materials such as flux-cored brazing filler metal, flux-coated brazing filler metal and powder metallurgy brazing filler metal are analyzed. The article highlights the problems encountered in the research and development of composite brazing materials and proposes future development directions, such as with low-silver and cadmium-free brazing filler metals, the creation of new powder brazing filler metal-forming technology and improvements to the quality of brazing filler metals by shape control and performance optimization, to accelerate the process of brazing automation.
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11
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Improvement of Thermal Cycling Resistance of Al xSi 1-xN Coatings on Cu Substrates by Optimizing Al/Si Ratio. MATERIALS 2019; 12:ma12142249. [PMID: 31336920 PMCID: PMC6679045 DOI: 10.3390/ma12142249] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 07/08/2019] [Accepted: 07/10/2019] [Indexed: 11/17/2022]
Abstract
The effect of the elemental composition of AlxSi1-xN coatings deposited on Cu substrates by magnetron sputtering on their structure, mechanical properties and thermal cycling performance is studied. The coatings with Al-Si-N solid solution, two-phase (AlxSi1-xN nanocrystallites embedded in the SixNy tissue phase) and amorphous structure were obtained by varying Al/Si ratio. It is shown that polycrystalline coatings with a low Si content (Al0.88Si0.12N) are characterized by the highest thermal cycling resistance. While the coatings with a high and intermediate Si content (Al0.11Si0.89N and Al0.74Si0.26N) were subjected to cracking and spallation after the first cycle of annealing at a temperature of 1000 °C, delamination of the Al0.88Si0.12N coating was observed after 25 annealing cycles. The Al0.88Si0.12N coating also exhibited the best barrier performance against copper diffusion from the substrate. The effect of thermal stresses on the diffusion barrier performance of the coatings against copper diffusion is discussed.
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12
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Gas Sensing with Nanoplasmonic Thin Films Composed of Nanoparticles (Au, Ag) Dispersed in a CuO Matrix. COATINGS 2019. [DOI: 10.3390/coatings9050337] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Magnetron sputtered nanocomposite thin films composed of monometallic Au and Ag, and bimetallic Au-Ag nanoparticles, dispersed in a CuO matrix, were prepared, characterized, and tested, which aimed to find suitable nano-plasmonic platforms capable of detecting the presence of gas molecules. The Localized Surface Plasmon Resonance phenomenon, LSPR, induced by the morphological changes of the nanoparticles (size, shape, and distribution), and promoted by the thermal annealing of the films, was used to tailor the sensitivity to the gas molecules. Results showed that the monometallic films, Au:CuO and Ag:CuO, present LSPR bands at ~719 and ~393 nm, respectively, while the bimetallic Au-Ag:CuO film has two LSPR bands, which suggests the presence of two noble metal phases. Through transmittance-LSPR measurements, the bimetallic films revealed to have the highest sensitivity to the refractive index changes, as well as high signal-to-noise ratios, respond consistently to the presence of a test gas.
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13
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Wang Y, Hu M, Ai D, Zhang H, Huang ZH, Lv R, Kang F. Sulfur-Doped Reduced Graphene Oxide for Enhanced Sodium Ion Pseudocapacitance. NANOMATERIALS (BASEL, SWITZERLAND) 2019; 9:E752. [PMID: 31100878 PMCID: PMC6566370 DOI: 10.3390/nano9050752] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Revised: 05/09/2019] [Accepted: 05/12/2019] [Indexed: 12/05/2022]
Abstract
Sodium-ion capacitors (NICs) are considered an important candidate for large-scale energy storage in virtue of their superior energy-power properties, as well as availability of rich Na+ reserves. To fabricate high-performance NIC electrode material, a hydrothermal method was proposed to synthesize sulfur-doped reduced graphene oxide (SG), which exhibited unique layered structures and showed excellent electrochemical properties with 116 F/g capacitance at 1 A/g as the cathode of NICs from 1.6 V to 4.2 V. At the power-energy density over 5000 W/kg, the SG demonstrated over 100 Wh/kg energy density after 3500 cycles, which indicated its efficient durability and superior power-energy properties. The addition of a sulfur source in the hydrothermal process led to the higher specific surface area and more abundant micropores of SG when compared with those of reduced graphene oxide (rGO), thus SG exhibited much better electrochemical properties than those shown by rGO. Partially substituting surface oxygen-containing groups of rGO with sulfur-containing groups also facilitated the enhanced sodium-ion storage ability of SG by introducing sufficient pseudocapacitance.
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Affiliation(s)
- Yiting Wang
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China.
| | - Mingxiang Hu
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
| | - Desheng Ai
- Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China.
| | - Hongwei Zhang
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
| | - Zheng-Hong Huang
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
| | - Ruitao Lv
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
| | - Feiyu Kang
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
- Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
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Effect of Thickness of Molybdenum Nano-Interlayer on Cohesion between Molybdenum/Titanium Multilayer Film and Silicon Substrate. NANOMATERIALS 2019; 9:nano9040616. [PMID: 31014008 PMCID: PMC6523496 DOI: 10.3390/nano9040616] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Revised: 04/08/2019] [Accepted: 04/11/2019] [Indexed: 11/16/2022]
Abstract
Titanium (Ti) film has been used as a hydrogen storage material. The effect of the thickness of a molybdenum (Mo) nano-interlayer on the cohesive strength between a Mo/Ti multilayer film and a single crystal silicon (Si) substrate was investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and nano-indenter. Four groups of Si/Mo/Ti multilayer films with different thicknesses of Mo and Ti films were fabricated. The XRD results showed that the introduction of the Mo layer suppressed the chemical reaction between the Ti film and Si substrate. The nano-indenter scratch results demonstrated that the cohesion between the Mo/Ti film and Si substrate decreased significantly with increasing Mo interlayer thickness. The XRD stress analysis indicated that the residual stress in the Si/Mo/Ti film was in-plane tensile stress which might be due to the lattice expansion at a high film growth temperature of 700 °C and the discrepancy of the thermal expansion coefficient between the Ti film and Si substrate. The tensile stress in the Si/Mo/Ti film decreased with increasing Mo interlayer thickness. During the cooling of the Si substrate, a greater decrease in tensile stress occurred for the thicker Mo interlayer sample, which became the driving force for reducing the cohesion between the Mo/Ti film and Si substrate. The results confirmed that the design of the Mo interlayer played an important role in the quality of the Ti film grown on Si substrate.
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Jaiswal R, Saha U, Goswami TH, Srivastava A, Eswara Prasad N. A unique extension of Suzuki-Sonogashira cross coupling reaction in developing acetylene terminated fullerene core star-like phenylene-alt-thiophene dyad materials and its photovoltaic properties. POLYMER 2019. [DOI: 10.1016/j.polymer.2019.01.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Gao K, Wang Y, Wei X, Qiang L, Zhang B, Zhang J. Hydrogenated amorphous carbon films with different nanostructure: A comparative study. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2018.11.028] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Molecular Dynamics Investigation of Graphene Nanoplate Diffusion Behavior in Poly-α-Olefin Lubricating Oil. CRYSTALS 2018. [DOI: 10.3390/cryst8090361] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Graphene as a type of novel additive significantly enhanced the tribological performance of blended lubricating oil. However, the dispersibility of graphene with long-term stability in lubricating oil is still a challenge. Chemical modification for graphene, rather than using surfactants, provided a better method to improve the dispersibility of graphene in lubricants. In this study, the equilibrium molecular dynamics (EMD) simulations were carried out to investigate the diffusion behavior of graphene nanoplates in poly-α-olefin (PAO) lubricating oil. The effects of graphene-size, edge-functionalization, temperature, and pressure on the diffusion coefficient were studied. In order to understand the influence of edge-functionalization, three different functional groups were grafted to the edge of graphene nanoplates: COOH, COON(CH3)2, CONH(CH2)8CH3 (termed GO, MG, and AG, respectively). The EMD simulations results demonstrated that the relationships between diffusion coefficient and graphene-size and number of functional groups were linear while the temperature and pressure had a nonlinear influence on the diffusion coefficient. It was found that the larger dimension and more functional groups provided the lower diffusion coefficient. AG with eight CONH(CH2)8CH3 groups exhibited the lowest diffusion coefficient. Furthermore, the experimental results and radial distribution function for graphene-PAO illustrated that the diffusion coefficient reflected the dispersibility of nanoparticles in nanofluids to some degree. To our best knowledge, this study is the first time the diffusion behavior of graphene in PAO lubricating oil was investigated using EMD simulations.
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Lai CC, Goyenola C, Broitman E, Näslund LÅ, Högberg H, Hultman L, Gueorguiev GK, Rosen J. Synthesis and properties of CS x F y thin films deposited by reactive magnetron sputtering in an Ar/SF 6 discharge. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:195701. [PMID: 28319035 DOI: 10.1088/1361-648x/aa67d2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
A theoretical and experimental study on the growth and properties of a ternary carbon-based material, CS x F y , synthesized from SF6 and C as primary precursors is reported. The synthetic growth concept was applied to model the possible species resulting from the fragmentation of SF6 molecules and the recombination of S-F fragments with atomic C. The possible species were further evaluated for their contribution to the film growth. Corresponding solid CS x F y thin films were deposited by reactive direct current magnetron sputtering from a C target in a mixed Ar/SF6 discharge with different SF6 partial pressures ([Formula: see text]). Properties of the films were determined by x-ray photoelectron spectroscopy, x-ray reflectivity, and nanoindentation. A reduced mass density in the CS x F y films is predicted due to incorporation of precursor species with a more pronounced steric effect, which also agrees with the low density values observed for the films. Increased [Formula: see text] leads to decreasing deposition rate and increasing density, as explained by enhanced fluorination and etching on the deposited surface by a larger concentration of F/F2 species during the growth, as supported by an increment of the F relative content in the films. Mechanical properties indicating superelasticity were obtained from the film with lowest F content, implying a fullerene-like structure in CS x F y compounds.
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Affiliation(s)
- Chung-Chuan Lai
- Thin Film Physics Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-58183 Linköping, Sweden
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Denis PA, Iribarne F. Cooperative behavior in functionalized graphene: Explaining the occurrence of 1,3 cycloaddition of azomethine ylides onto graphene. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2012.08.062] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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dos Santos RB, Rivelino R, de B. Mota F, Gueorguiev GK. Exploring Hydrogenation and Fluorination in Curved 2D Carbon Systems: A Density Functional Theory Study on Corannulene. J Phys Chem A 2012; 116:9080-7. [DOI: 10.1021/jp3049636] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Renato B. dos Santos
- Instituto de Física, Universidade Federal da Bahia, 40210-340 Salvador,
Bahia, Brazil
| | - Roberto Rivelino
- Instituto de Física, Universidade Federal da Bahia, 40210-340 Salvador,
Bahia, Brazil
| | - Fernando de B. Mota
- Instituto de Física, Universidade Federal da Bahia, 40210-340 Salvador,
Bahia, Brazil
| | - Gueorgui K. Gueorguiev
- Department
of Physics, Chemistry,
and Biology, IFM, Linköping University, SE-58183 Linköping, Sweden
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Denis PA. Tuning the electronic properties of doped bilayer graphene with small structural changes. COMPUT THEOR CHEM 2011. [DOI: 10.1016/j.comptc.2011.07.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Gueorguiev G, Goyenola C, Schmidt S, Hultman L. CF : A first-principles study of structural patterns arising during synthetic growth. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2011.09.045] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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