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Wang S, Sunkara SV, Manna S, Ahmadiparidari A, Kumar K, Yang T, Namvar S, Seraji P, Huang Z, Cabana J, Sankaranarayanan SKRS, Liu Y, Sumant AV, Salehi‐Khojin A. Self-Lubricating Tribo-Catalytic Activity of 2D High Entropy Alloy Nanoflakes. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2025; 21:e2500322. [PMID: 40123271 PMCID: PMC12019924 DOI: 10.1002/smll.202500322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2025] [Indexed: 03/25/2025]
Abstract
High Entropy Alloys (HEAs) have garnered attention due to their remarkable tribological attributes. Predominantly, failure mechanisms in HEAs emanate from stress-induced dislocations, culminating in crack propagation and film delamination. In this study, we report on the synthesis of 2D HEA of (MoWNbTaV)0.2S2 which facilitates shear-induced energy dissipation at sliding interfaces. The ball-on-disk tribological investigations demonstrate unprecedentedly low average coefficients of friction (0.076) and wear rates (10-9 mm3 (N∙m)-1) under high contact pressures (0.936 GPa) within ambient conditions. Employing multi-scale characterizations alongside molecular dynamic simulations, we elucidate that the presence of the HEA triggers tribocatalytic activity under high contact pressures emerging as a pivotal factor in extending lubricant lifespan during tribological tests. The resilient lubriciousness coupled with the facile spray coating methodology of (MoWNbTaV)0.2S2 in ambient environments paves the way for the development of a new class of solid lubricants based on 2D HEA.
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Affiliation(s)
- Shuxi Wang
- Department of Mechanical and Industrial EngineeringUniversity of Illinois at ChicagoChicagoIL60607USA
- MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed MatterSchool of PhysicsXi'an Jiaotong UniversityXi'an710049China
| | - Sai Varun Sunkara
- Department of Mechanical and Industrial EngineeringUniversity of Illinois at ChicagoChicagoIL60607USA
- Center for Nanoscale MaterialsArgonne National LaboratoryLemontIL60439USA
| | - Sukriti Manna
- Department of Mechanical and Industrial EngineeringUniversity of Illinois at ChicagoChicagoIL60607USA
- Center for Nanoscale MaterialsArgonne National LaboratoryLemontIL60439USA
| | - Alireza Ahmadiparidari
- Department of Mechanical and Industrial EngineeringUniversity of Illinois at ChicagoChicagoIL60607USA
| | - Khagesh Kumar
- Department of ChemistryUniversity of Illinois at ChicagoChicagoIL60607USA
| | - Taimin Yang
- Department of Materials and Environmental ChemistryStockholm UniversityStockholm10691Sweden
| | - Shahriar Namvar
- Department of Mechanical and Industrial EngineeringUniversity of Illinois at ChicagoChicagoIL60607USA
| | - Pardis Seraji
- Department of Mechanical and Industrial EngineeringUniversity of Illinois at ChicagoChicagoIL60607USA
| | - Zhehao Huang
- Department of Materials and Environmental ChemistryStockholm UniversityStockholm10691Sweden
| | - Jordi Cabana
- Department of ChemistryUniversity of Illinois at ChicagoChicagoIL60607USA
| | - Subramanian K. R. S. Sankaranarayanan
- Department of Mechanical and Industrial EngineeringUniversity of Illinois at ChicagoChicagoIL60607USA
- Center for Nanoscale MaterialsArgonne National LaboratoryLemontIL60439USA
| | - Yuzi Liu
- Center for Nanoscale MaterialsArgonne National LaboratoryLemontIL60439USA
| | - Anirudha V. Sumant
- Center for Nanoscale MaterialsArgonne National LaboratoryLemontIL60439USA
| | - Amin Salehi‐Khojin
- Department of Mechanical and Industrial EngineeringUniversity of Illinois at ChicagoChicagoIL60607USA
- Department of Mechanical EngineeringSouthern Methodist UniversityDallasTX75205USA
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2
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Du C, Yu T, Sui X, Zhang Z, Cai R, Zhang L, Feng Y, Feng M, Zhou F, Wang D. Macro-Superlubricity Induced by Tribocatalysis of High-Entropy Ceramics. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2025; 37:e2413781. [PMID: 39610160 DOI: 10.1002/adma.202413781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2024] [Revised: 11/24/2024] [Indexed: 11/30/2024]
Abstract
Macroscale superlubricity has attracted considerable attention as a promising strategy to minimize frictional energy dissipation and achieve near-zero wear. However, realizing macroscale superlubricity with prolonged durability remains an immense challenge, particularly on engineering steels. Current superlubricants render steel surfaces susceptible to corrosion, causing severe wear and superlubrication failure. Herein, high-entropy ceramics (HEC) with catalytic properties are innovatively introduced to prevent corrosion of engineering steels and achieve macro-superlubricity through tribo-catalytic effect. Furthermore, this catalytically induced superlubricity system exhibits an ultra-low friction coefficient of 0.0037 under contact pressure up to 1.47 GPa, an ultra-long cycle lifetime of 1.25 × 106 cycles (corresponding sliding distance up to 5 km), and an extremely low wear rate of 3.032 × 10-10 mm3·N-1·m-1 on the HEC surface. Based on the experimental analysis and theoretical simulation, the in situ formed HEC nanocrystals reduce the Gibbs free energy of hydrolysis of PA molecules into inositol and phosphoric acid molecules in the lubricant. Notably, the hydrolysis products favorably contributed to the reduction of shear force in the lubrication system, which is essential for achieving macroscale superlubricity over a long time. This study provides a new perspective for designing robust superlubricity systems by harnessing the tribocatalytic effect of high-entropy materials.
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Affiliation(s)
- Changhe Du
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
- Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing, Yantai, 265503, China
| | - Tongtong Yu
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Xudong Sui
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China
- Institute for Engineering Design and Product Development, Tribology Research Division, TU Wien, Vienna, 1060, Austria
| | - Zhengfeng Zhang
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Rongsheng Cai
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Liqiang Zhang
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China
| | - Yange Feng
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
- Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing, Yantai, 265503, China
| | - Min Feng
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China
- Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing, Yantai, 265503, China
| | - Feng Zhou
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Daoai Wang
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China
- Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China
- Shandong Laboratory of Yantai Advanced Materials and Green Manufacturing, Yantai, 265503, China
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3
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Tang X, Song A, Wu H, Feng K, Shao T, Ma T. Observing and Modeling the Wear Process of Heterogeneous Interface. NANO LETTERS 2024; 24:6965-6973. [PMID: 38814470 DOI: 10.1021/acs.nanolett.4c01290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2024]
Abstract
Understanding and controlling the wear process of heterogeneous interfaces between soft and hard phases is crucial for designing and fabricating materials, such as improving the wear resistance of particle reinforced metal matrix composites and the accuracy and efficiency of chemical mechanical polishing. However, the wear process can be hardly observed, as interfaces are buried under the surface. Here, we proposed a nanowear test method by combining focused ion beam cutting to expose interfaces, atomic force microscopy to rub against interfaces, and scanning electron microscope to characterize the interface damage. Using this method, three typical wear forms had been observed in Al/SiC composite, i.e., merely matrix wear, particle fracture, and particle pullout. A theoretical model was proposed that revealed that the increasing interfacial friction would induce particle fracture or pullout, depending on the particle edge angle and tip edge angle. This work sheds light on wear control in composites and nanofabrication.
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Affiliation(s)
- Xin Tang
- State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China
| | - Aisheng Song
- State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China
| | - Haijun Wu
- State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China
- Sino-Platinum Metals Co., Ltd., Wuhua District, Kunming, Yunnan 650221, China
| | - Kaili Feng
- State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China
| | - Tianmin Shao
- State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China
| | - Tianbao Ma
- State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China
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4
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Younus K, Zhou Y, Zhu M, Xu D, Guo X, Ahmed A, Ouyang F, Huang H, Xiao S, Chen Z, He J. Observation of Anisotropic Second Harmonic Generation in Two-Dimensional Niobium Diselenide. J Phys Chem Lett 2024; 15:4992-4999. [PMID: 38695534 DOI: 10.1021/acs.jpclett.4c00923] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2025]
Abstract
The intrinsic anisotropy of NbSe2 provides a favorable prerequisite of second harmonic generation (SHG) and rich possibilities for tailoring its nonlinear optical (NLO) properties. Here we report the highly efficient SHG of mechanically exfoliated NbSe2 flakes. The nonlinear optical response changes with excitation wavelengths, layer thicknesses, and polarizations of the excitation laser. The anisotropic SHG response further exhibits the intrinsic non-centrosymmetric crystal structure and could effectively assign the crystalline orientation of NbSe2 flakes. Interestingly, although NbSe2 flakes with tens of nanometers thickness experience attenuations in SHG performance, more efficient SHG anisotropy ratios were obtained, which are around 4 times higher than that of the 5-layer counterpart. The determined second-order nonlinearities of NbSe2 flakes (monolayer: ∼1.0 × 103 pm/V; 3-layer: ∼73 pm/V) are comparable to those of the commonly reported two-dimensional materials (e.g., MoS2, WSe2, graphene) with the same number of layers and much higher than those of commercial nonlinear optical crystals.
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Affiliation(s)
- Khansa Younus
- Hunan Key Laboratory of Nanophotonics and Devices, School of Physics, Central South University, 932 South Lushan Road, Changsha, Hunan 410083, P. R. China
| | - Yu Zhou
- Hunan Key Laboratory of Nanophotonics and Devices, School of Physics, Central South University, 932 South Lushan Road, Changsha, Hunan 410083, P. R. China
| | - Menglong Zhu
- Department of Applied Physics, School of Microelectronics and Physics, Hunan University of Technology and Business, Changsha 410205, China
| | - Defeng Xu
- Hunan Key Laboratory of Nanophotonics and Devices, School of Physics, Central South University, 932 South Lushan Road, Changsha, Hunan 410083, P. R. China
| | - Xiao Guo
- Hunan Key Laboratory of Nanophotonics and Devices, School of Physics, Central South University, 932 South Lushan Road, Changsha, Hunan 410083, P. R. China
| | - Asad Ahmed
- Hunan Key Laboratory of Nanophotonics and Devices, School of Physics, Central South University, 932 South Lushan Road, Changsha, Hunan 410083, P. R. China
| | - Fangping Ouyang
- Hunan Key Laboratory of Nanophotonics and Devices, School of Physics, Central South University, 932 South Lushan Road, Changsha, Hunan 410083, P. R. China
- School of Physics and Technology, State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, Xinjiang University, Urumqi 830046, People's Republic of China
| | - Han Huang
- Hunan Key Laboratory of Nanophotonics and Devices, School of Physics, Central South University, 932 South Lushan Road, Changsha, Hunan 410083, P. R. China
| | - Si Xiao
- Hunan Key Laboratory of Nanophotonics and Devices, School of Physics, Central South University, 932 South Lushan Road, Changsha, Hunan 410083, P. R. China
| | - Zhihui Chen
- Hunan Key Laboratory of Nanophotonics and Devices, School of Physics, Central South University, 932 South Lushan Road, Changsha, Hunan 410083, P. R. China
| | - Jun He
- Hunan Key Laboratory of Nanophotonics and Devices, School of Physics, Central South University, 932 South Lushan Road, Changsha, Hunan 410083, P. R. China
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Shein K, Zharkova E, Kashchenko M, Kolbatova A, Lyubchak A, Elesin L, Nguyen E, Semenov A, Charaev I, Schilling A, Goltsman G, Novoselov KS, Gayduchenko I, Bandurin DA. Fundamental Limits of Few-Layer NbSe 2 Microbolometers at Terahertz Frequencies. NANO LETTERS 2024; 24:2282-2288. [PMID: 38345381 DOI: 10.1021/acs.nanolett.3c04493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/22/2024]
Abstract
The rapid development of infrared spectroscopy, observational astronomy, and scanning near-field microscopy has been enabled by the emergence of sensitive mid- and far-infrared photodetectors. Superconducting hot-electron bolometers (HEBs), known for their exceptional signal-to-noise ratio and fast photoresponse, play a crucial role in these applications. While superconducting HEBs are traditionally crafted from sputtered thin films such as NbN, the potential of layered van der Waals (vdW) superconductors is untapped at THz frequencies. Here, we introduce superconducting HEBs made from few-layer NbSe2 microwires. By improving the interface between NbSe2 and metal leads, we overcome impedance mismatch with RF readout, enabling large responsivity THz detection (0.13 to 2.5 THz) with a minimal noise equivalent power of 7 pW/ H z and nanosecond-range response time. Our work highlights NbSe2 as a promising platform for HEB technology and presents a reliable vdW assembly protocol for custom bolometer production.
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Affiliation(s)
- Kirill Shein
- Moscow Pedagogical State University, Moscow, Russia 119991
- National Research University Higher School of Economics, Moscow, Russia 101000
| | - Ekaterina Zharkova
- Programmable Functional Materials Lab, Center for Neurophysics and Neuromorphic Technologies, Moscow, Russia 127495
| | - Mikhail Kashchenko
- Programmable Functional Materials Lab, Center for Neurophysics and Neuromorphic Technologies, Moscow, Russia 127495
| | - Anna Kolbatova
- Moscow Pedagogical State University, Moscow, Russia 119991
| | - Anastasia Lyubchak
- Moscow Pedagogical State University, Moscow, Russia 119991
- National Research University Higher School of Economics, Moscow, Russia 101000
| | - Leonid Elesin
- Programmable Functional Materials Lab, Center for Neurophysics and Neuromorphic Technologies, Moscow, Russia 127495
- Institute for Functional Intelligent Materials, National University of Singapore, Singapore 117575
- Department of Materials Science and Engineering, National University of Singapore, Singapore 117575
| | - Ekaterina Nguyen
- Programmable Functional Materials Lab, Center for Neurophysics and Neuromorphic Technologies, Moscow, Russia 127495
| | | | | | | | - Gregory Goltsman
- Moscow Pedagogical State University, Moscow, Russia 119991
- National Research University Higher School of Economics, Moscow, Russia 101000
| | - Kostya S Novoselov
- Institute for Functional Intelligent Materials, National University of Singapore, Singapore 117575
| | - Igor Gayduchenko
- Moscow Pedagogical State University, Moscow, Russia 119991
- National Research University Higher School of Economics, Moscow, Russia 101000
| | - Denis A Bandurin
- Department of Materials Science and Engineering, National University of Singapore, Singapore 117575
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