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strain engineering in single-,bi-and tri-layer MoS_(2),MoSe_(2),WS_(2)and WSe_(2)

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Nano Research 2021年第6期14卷 1698-1703页

作者： Felix Carrascoso Hao Li Riccardo Frisenda Andres Castellanos-Gomez Materials Science Factory Instituto de Ciencia de Materiales de MadridConsejo Superior de Investigaciones Cientificas28049MadridSpain

strain is a powerful tool to modify the optical properties of semiconducting transition metal dichalcogenides like MoS_(2),MoSe_(2),WS_(2) and WSe_(2).In this work we provide a thorough description of the technical details to perform uniaxial strain measurements on these two-dimensional semiconductors and we provide a straightforward calibration method to determine the amount of applied strain with high *** then employ reflectance spectroscopy to analyze the strain tunability of the electronic properties of single-,bi-and tri-layer MoS_(2),MoSe_(2),WS_(2) and WSe_(2).Finally,we quantify the flake-to-flake variability by analyzing 15 different single-layer MoS_(2) flakes.

关键词： two-dimensional(2D)materials transition metal dichalcogenides strain engineering band gap differential reflectance

strain engineering of anisotropic light-matter interactions in onedimensional P-P chain of SiP_(2)

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Nano Research 2022年第8期15卷 7378-7383页

作者： Fanghua Cheng Junwei Huang Feng Qin Ling Zhou Xueting Dai Xiangyu Bi Caorong Zhang Zeya Li Ming Tang Caiyu Qiu Yangfan Lu Huiyang Gou Hongtao Yuan National Laboratory of Solid State Microstructures and Jiangsu Key Laboratory of Artificial Functional Materials College of Engineering and Applied SciencesNanjing UniversityNanjing 210000China College of Materials Science and engineering National Engineering Research Center for Magnesium AlloysChongqing UniversityChongqing 400030China Center for High Pressure Science and Technology Advanced Research Beijing 100094China

strain engineering can serve as a powerful technique for modulating the exotic properties arising from the atomic structure of *** have been demonstrated that one-dimensional(1D)structure can serve as a great platform for modulating electronic band structure and phonon dispersion via strain ***,in a van der Waals material silicon diphosphide(SiP_(2)),quasi-1D zigzag phosphorus–phosphorus(P–P)chains are embedded inside the crystal structure,and can show unique phonon vibration modes and realize quasi-1D *** those optical properties by the atom displacements via strain engineering is of great interest in understanding underlying mechanism of such P–P chains,however,which remains ***,we demonstrate the strain engineering of Raman and photoluminescence(PL)spectra in quasi-1D P–P chains and resulting in anisotropic manipulation in SiP_(2).We find that the phonon frequencies of SiP_(2)in Raman spectra linearly evolve with a uniaxial strain along/perpendicular to the quasi-1D P–P chain ***,by applying tensile strain along the P–P chains,the band gap energy of strained SiP_(2)can significantly decrease with a tunable value of~55 *** on arsenic(As)element doping into SiP_(2),the strain-induced redshifts of phonon frequencies decrease,indicating the stiffening of the phonon vibration with the increased arsenic doping *** results provide an opportunity for strain engineering of the light–matter interactions in the quasi-1D P–P chains of SiP_(2)crystal for potential optical applications.

关键词： strain engineering silicon diphosphide Raman photoluminescence

strain engineering and hydrogen effect for two-dimensional ferroelectricity in monolayer group-Ⅳmonochalcogenides MX(M=Sn,Ge;X=Se,Te,S)

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Chinese Physics B 2023年第3期32卷 396-401页

作者： Maurice Franck Kenmogne Ndjoko 郭必诞彭银辉赵宇军 Department of Materials Science and engineering South China University of TechnologyGuangzhou 510640China Department of Physics South China University of TechnologyGuangzhou 510640China

Two-dimensional(2D)ferroelectric compounds are a special class of materials that meet the need for devices miniaturization,which can lead to a wide range of ***,we investigate ferroelectric properties of monolayer group-IV monochalcogenides MX(M=Sn,Ge;X=Se,Te,S)via strain engineering,and their effects with contaminated hydrogen are also ***,GeTe,and GeS do not go through transition up to the compressive strain of-5%,and consequently have good ferroelectric parameters for device applications that can be further improved by applying *** to the calculated ferroelectric properties and the band gaps of these materials,we find that their band gap can be adjusted by strain for excellent photovoltaic *** addition,we have determined the most stable hydrogen occupancy location in the monolayer SnS and *** reveals that H prefers to absorb on SnS and SnTe monolayers as molecules rather than atomic *** a result,hydrogen molecules have little effect on the polarization and electronic structure of monolayer SnTe and SnS.

关键词： two-dimensional material strain engineering ferroelectric photovoltaic materials hydrogen effect

strain engineering of ion migration in LiCoO_(2)

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Frontiers of physics 2022年第1期17卷 169-176页

作者： Jia-Jing Li Yang Dai Jin-Cheng Zheng Department of Physics and Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient DevicesXiamen UniversityXiamen361005China Department of Chemical engineering School of Environmental and Chemical Engineeringand Institute for Sustainable EnergyShanghai UniversityShangda Road 99Shanghai200444China Department of Physics Xiamen University Malaysia439000SepangSelangorMalaysia Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry Xiamen UniversityXiamen361005China

strain engineering is a powerful approach for tuning various properties of functional materials. The influences of lattice strain on the Li-ion migration energy barrier of lithium-ions in layered LiCoO_(2) have been systemically studied using lattice dynamics simulations, analytical function and neural network method. We have identified two Li-ion migration paths, oxygen dumbbell hop (ODH), and tetrahedral site hop (TSH) with different concentrations of local defects. We found that Li-ion migration energy barriers increased with the increase of pressure for both ODH and TSH cases, while decreased significantly with applied tensile uniaxial c-axis strain for ODH and TSH cases or compressive in-plane strain for TSH case. Our work provides the complete strain-map for enhancing the diffusivity of Li-ion in LiCoO_(2), and therefore, indicates a new way to achieve better rate performance through strain engineering.

关键词： LiCoO_(2) strain engineering migration energy barrier lithium-ion battery

strain engineering of two-dimensional materials:Methods,properties,and applications

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InfoMat 2021年第4期3卷 397-420页

作者： Shengxue Yang Yujia Chen Chengbao Jiang School of Materials Science and engineering Beihang UniversityBeijingChina

Two dimensional(2D)materials have attracted extensive research interests due to their excellent properties related to unique *** engineering,as an important strategy for tuning the lattice and electronic structure of 2D mate-rials,has been widely used in the modulation of physical properties,which broadens their applications in flexible nanoelectronic and optoelectronic *** this review,we fist summari ze the methods of inducing strain to 2D materials and discuss the advantages and problems of various *** then introduce the strain induced effects on optical,electrical,and magnetic proper-ties,together with the phase transition of 2D ***,we ilustrate the potential applications of strained 2D materials and further look forward to their opportunities and challenges in practical applications in the future.

关键词： 2D materials photodetector piezoresistive effect strain engineering strain sensor

New Janus structure photocatalyst having widely tunable electronic and optical properties with strain engineering

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Journal of Materials Science & Technology 2023年第24期155卷 142-147页

作者： Sri Kasi Matta Ting Liao Salvy P Russo Center for Computational Sciences University of Tsukuba Japan ARC Centre of Excellence in Exciton Science School of Science RMIT University Melbourne 3000 Australia School of Mech. Medical & Process Engineering Queensland University of Technology Gardens Point Campus Brisbane Queensland Australia

Photoelectrochemical water splitting using solar energy,generating oxygen and hydrogen is one of the clean fuel production *** by surface-dependent characteristics of Janus structures,a newly designed Janus monolayer Silicon Phosphorous Arsenide(SiPAs)was analyzed with Density Functional Theory(DFT)*** exchange-correlation functional(HSE06)combined with Wannier90-based analysis for electronic and optical properties of SiPAs reveals that it can act as a *** show an indirect bandgap of 1.88 eV,absorbing visible light range is 350 to 500 *** phonon spectrum confirms dynamic *** exciton binding energy is computed with GW/BSE *** electronic band edge positions are at-5.75 and-4.43 eV,perfectly straddling the water redox *** the strain application modifies the bandgap and also non-homogenously widens the absorption band.A novel range of photocatalyst designs with Group IV-V elements with great promise for water-splitting,photovoltaic,and narrow bandgap semiconductor(optoelectronics)applications may be feasible.

关键词： Solar water-splitting Janus structure Density functional theory strain engineering Optical and electronic property tuning Optoelectronic

Opportunities and challenges of strain engineering for advanced electrocatalyst design

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Nano Research 2023年第7期16卷 8655-8669页

作者： Qing-Man Liang Xinchang Wang Xin-Wang Wan Long-Xing Lin Bi-Jun Geng Zhong-Qun Tian Yang Yang Department of Physics Pen-Tung Sah Institute of Micro-Nano Science and TechnologyState Key Laboratory of Physical Chemistry of Solid SurfacesXiamen UniversityXiamen 361005China

Electrocatalysis is becoming more and more important in energy conversion and storage due to rising energy demands,increasing carbon dioxide emissions,and impending climate *** design and synthesis of high-performance electrocatalysts are the spotlights of *** many design methodologies reported,strain engineering has gained growing attention because it can change the atomic arrangement and lattice structure of ***,strain engineering remains to be problematic in regulating the properties of *** review discusses the strain effect tactics to regulate metal and non-metal electrocatalysts,including three sections focusing on strain categorization,strain regulation mechanism,and applications in electrocatalysis,***,the current challenges and an outlook of strain engineering are discussed.

关键词： electrocatalysis electrocatalyst design strain engineering categorization and mechanism applications in electrocatalysis

Carrier mobility tuning of MoS_(2) by strain engineering in CVD growth process

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Nano Research 2021年第7期14卷 2314-2320页

作者： Yongfeng Chen Wenjie Deng Xiaoqing Chen Yi Wu Jianwei Shi Jingying Zheng Feihong Chu Beiyun Liu Boxing An Congya You Liying Jiao Xinfeng Liu Yongzhe Zhang College of Materials Science and engineering Key Laboratory of Advanced Functional Materials of Education Ministry of ChinaBeijing Key Laboratory of Microstructure and Property of Advanced MaterialsBeijing University of TechnologyBeijing 100124China Key Laboratory of Organic Optoelectronics and Molecular engineering of the Ministry of Education Department of ChemistryTsinghua UniversityBeijing 100084China CAS Key Laboratory of Standardization and Measurement for Nanotechnology CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China

strain engineering is proposed to be an effective technology to tune the properties of two-dimensional(2D)transition metal dichalcogenides(TMDCs).Conventional strain engineering techniques(e.g.,mechanical bending,heating)cannot conserve strain due to their dependence on external action,which thereby limits the application in *** addition,the theoretically predicted strain-induced tuning of electrical performance of TMDCs has not been experimentally proved ***,a facile but effective approach is proposed to retain and tune the biaxial tensile strain in monolayer MoS_(2) by adjusting the process of the chemical vapor deposition(CVD).To prove the feasibility of this method,the strain formation model of CVD grown MoS_(2) is proposed which is supported by the calculated strain dependence of band gap via the density functional theory(DFT).Next,the electrical properties tuning of strained monolayer MoS_(2) is demonstrated in experiment,where the carrier mobility of MoS_(2) was increased by two orders(~0.15 to~23 cm^(2)·V^(−1)·s^(−1)).The proposed pathway of strain preservation and regulation will open up the optics application of strain engineering and the fabrication of high performance electronic devices in 2D materials.

关键词： MoS_(2) CVD carrier mobility strain engineering 2D materials

Interface strain engineering of Ir clusters on ultrathin NiO nanosheets for electrochemical water splitting over 1800 hours

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Journal of Materials Science & Technology 2024年第10期177卷 214-223页

作者： Binyu Zhang Weiwei Li Kexi Zhanga Jingtao Gao Yang Cao Yuqian Cheng Delun Chen Qiang Wu Lei Ding Jinchun Tu Xiaolin Zhang Chenghua Sun State Key Laboratory of Marine Resource Utilization in South China Sea School of Materials Science and EngineeringHainan UniversityHaikou 570228China Key Laboratory of Child Cognition&Behavior Development of Hainan Province Qiongtai Normal UniversityHaikou 571127China Department of Clinical Laboratory of The Second Affiliated Hospital School of Tropical Medicine and Laboratory MedicineKey Laboratory of Emergency and Trauma of Ministry of EducationHainan Medical UniversityHaikou 571199China ARC Centre for Electromaterials Science School of ChemistryMonash UniversityClaytonVictoria 3800Australia

strain engineering of two-dimensional(2D)material interfaces represents a powerful strategy for enhanc-ing the electrocatalytic activity of water ***,maintaining catalytic stability under various harsh conditions by introducing interface strain remains a great *** catalyst developed and evaluated herein comprised Ir clusters dispersed on 2D NiO nanosheets(NSs)derived from metal organic frameworks(lr@NiO/C_(BDc)),which displays a high activity and stability under all pH conditions,and even a change of only 1%in the applied voltage is observed after continuous electrocatalytic operation for over 1800 h under alkaline *** combined experimental and computational studies,we found that the introduced interfacial strain contributes to the outstanding structural stability of the Ir@NiO/CBDC catalyst,arising from its increased Ir and Ni vacancy formation energies,and hence suppressing its ***,strain also enhances the kinetically sluggish electrocatalytic water splitting reaction by op-timizing its electronic structure and coordination *** work highlights the effects of strain on catalyst stability and provides new insights for designing widely applicable electrocatalysts.

关键词： strain engineering Stability Electrocatalysts Two-dimensional material Water splitting