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Study of the growth mechanism of a self‑assembled and ordered multi‑dimensional heterojunction at atomic resolution

Frontiers of Optoelectronics 2023年第4期16卷 37-48页

作者： Zunyu Liu Chaoyu Zhao shuangfeng jia Weiwei Meng Pei Li Shuwen Yan Yongfa Cheng Jinshui Miao Lei Zhang Yihua Gao jianbo Wang Luying Li Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei Collaborative Innovation Center for Advanced Organic Chemical MaterialsSchool of Materials Science and EngineeringHubei UniversityWuhan 430061China Center for Electron Microscopy MOE Key Laboratory of Artificial Micro-and Nano-Structures and the Institute for Advanced StudiesSchool of Physics and TechnologyWuhan UniversityWuhan 430072China State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083China

Multi-dimensional heterojunction materials have attracted much attention due to their intriguing properties,such as high efciency,wide band gap regulation,low dimensional limitation,versatility and scalability.To further improve the performance of materials,researchers have combined materials with various dimensions using a wide variety of techniques.However,research on growth mechanism of such composite materials is still lacking.In this paper,the growth mechanism of multidimensional heterojunction composite material is studied using quasi-two-dimensional(quasi-2D)antimonene and quasione-dimensional(quasi-1D)antimony sulfde as examples.These are synthesized by a simple thermal injection method.It is observed that the consequent nanorods are oriented along six-fold symmetric directions on the nanoplate,forming ordered quasi-1D/quasi-2D heterostructures.Comprehensive transmission electron microscopy(TEM)characterizations confrm the chemical information and reveal orientational relationship between Sb2S3 nanorods and the Sb nanoplate as substrate.Further density functional theory calculations indicate that interfacial binding energy is the primary deciding factor for the self-assembly of ordered structures.These details may fll the gaps in the research on multi-dimensional composite materials with ordered structures,and promote their future versatile applications.

关键词： Multi-dimensional composite materials Ordered heterostructures-Self-assembly Growth mechanism

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3D Porous MXene Aerogel through Gas Foaming for Multifunctional PressureSensor

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Research 2022年第4期2022卷 321-331页

作者： Yongfa Cheng Li Li Zunyu Liu Shuwen Yan Feng Cheng Yang Yue shuangfeng jia jianbo Wang Yihua Gao Luying Li Wuhan National Laboratory for Optoelectronics(WNLO) Huazhong University of Science and Technology(HUST)Luoyu Road 1037Wuhan 430074China Information Materials and Intlligent Sensing Laboratory of Anhui Province Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of EducationInstitutes of Physical Science and Information TechnologyAnhui UniversityHefei 230601China School of Physics and Technology Center for Electron MicroscopyMOE Key Laboratory of Artificial Micro-and Nano-Structures and the Institute for Advanced StudiesWuhan UniversityWuhan 430072China

The development of smart wearable electronic devices puts forward higher requirements for future flexible electronics. The design of highly sensitive and high-performance flexible pressure sensors plays an important role in promoting the development of flexible electronic devices. Recently, MXenes with excellent properties have shown great potential in the field of flexible electronics. However, the easy-stacking inclination of nanomaterials limits the development of their excellent properties and the performance improvement of related pressure sensors. Traditional methods for constructing 3D porous structures have the disadvantages of complexity, long period, and difficulty of scalability. Here, the gas foaming strategy is adopted to rapidly construct 3D porous MXene aerogels. Combining the excellent surface properties of MXenes with the porous structure of aerogel, the prepared MXene aerogels are successfully used in high-performance multifunctional flexible pressure sensors with high sensitivity (306 kPa^(-1)), wide detection range (2.3 Pa to 87.3 kPa), fast response time (35 ms), and ultrastability (>20,000 cycles), as well as self-healing, waterproof, cold-resistant, and heat-resistant capabilities. MXene aerogel pressure sensors show great potential in harsh environment detection, behavior monitoring, equipment recovery, pressure array identification, remote monitoring, and human-computer interaction applications.

关键词： MXene porous Porous

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Orientation-dependent ductility and deformation mechanisms in body-centered cubic molybdenum nanocrystals

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Journal of Materials Science & Technology 2023年第23期154卷 107-113页

作者： Huayu Peng Yuxuan Hou He Zheng Ligong Zhao Ying Zhang Weiwei Meng Ting Liu Peili Zhao shuangfeng jia jianbo Wang School of Physics and Technology Center for Electron Microscopy MOE Key Laboratory of Artificial Micro- and Nano-structures and Institute for Advanced Studies Wuhan University Wuhan 430072 China Suzhou Institute of Wuhan University Suzhou Jiangsu 215123 China Wuhan University Shenzhen Research Institute Shenzhen Guangdong 518057 China Core Facility of Wuhan University Wuhan 430072 China

The knowledge regarding anisotropic mechanical behaviors in nanoscale body-centered cubic (bcc) metals remains obscure. Herein, we report the orientation-dependent ductility in bcc Mo nanocrystals (NCs), which exhibit poor ductility along [110] direction but possess relatively better ductility along the [001] and [112] orientations. The origin of different deformability can be traced down to the distinct deformation mechanisms: the unexpected crack nucleation and propagation induce premature fractures in [110]-oriented NCs;in contrast, deformation twinning could contribute to the enhanced ductility in [001]-oriented NCs;interestingly, we find the activation of multiple dislocation slips in [112]-oriented NCs with the highest ductility. Further molecular dynamics simulations provide deeper insights into the defect dynamics that are closely interlinked with experimental observations. Our findings advance the basic understanding of orientation-dependent mechanical properties and help to guide endeavors to architecture the microstructures of bcc metals with enhanced ductility.

关键词： In-situ tension test Ductility Crack Deformation twinning Dislocation slips Mo nanocrystals

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Strong size effect on deformation twin-me diate d plasticity in body-centered-cubic iron

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Journal of Materials Science & Technology 2023年第13期144卷 235-242页

作者： Ligong Zhao Guoxujia Chen He Zheng shuangfeng jia Kaixuan Li Renhui jiang Lei Li Ying Zhang Huayu Peng Peili Zhao Ziyang Huang jianbo Wang School of Physics and Technology Center for Electron MicroscopyMOE Key Laboratory of Artificial Micro-and Nano-structuresand Institute for Advanced StudiesWuhan UniversityWuhan 430072China Suzhou Institute of Wuhan University SuzhouJiangsu 215123China Wuhan University Shenzhen Research Institute ShenzhenGuangdong 518057China

Deformation twinning serves as an important mode of plastic dissipation processes in nanoscale body-centered cubic(BCC)metals,but its origin and spatio-temporal features are mysterious.Here,applying in situ tensile experiments,we report a strong size effect on mediating the twinning behaviors and twin boundary(TB)-dislocation interaction mechanisms in BCC iron(Fe)nanowires(NWs).There exists a critical diameter(d)of∼2.5 nm,above which the deformation twinning rather than dislocation slip dominates the plasticity.Unlike the traditional reflection TBs,the intermediate isosceles TBs are consis-tently observed as mediated by the 1/12partial dislocations.Moreover,we uncover two distinct TB-related deformation mechanisms,including twin variant re-orientation and TB cracking for NWs with d17 nm,respectively.Further molecular dynamics and statics simulations provide the basic underlying mechanisms for size-dependent plasticity,which have been largely overlooked in previous experimental investigations.Our findings highlight the importance of grain size in mediating the deformation behaviors in Fe,serving as possible guidance for exploring single-crystalline and poly-crystalline Fe-based materials(e.***.steel)with optimized mechanical performance.

关键词： Size effect Full dislocation,Isosceles twin boundary Twin variant rotation TB cracking

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Effects of twin orientation and twin boundary spacing on the plastic deformation behaviors in Ni nanowires

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Journal of Materials Science & Technology 2023年第4期135卷 231-240页

作者： Ying Zhang Yuxuan Hou He Zheng Ligong Zhao shuangfeng jia Kaixuan Li Huayu Peng Peili Zhao Lei Li Weiwei Meng Renhui jiang jianbo Wang School of Physics and Technology Center for Electron MicroscopyMOE Key Laboratory of Artificial Micro-and Nano-structures and Institute for Advanced StudiesWuhan UniversityWuhan 430072China Suzhou Institute of Wuhan University Suzhou 215123China Wuhan University Shenzhen Research Institute Shenzhen 518057China

Spreading twins throughout nano metals has been proved to effectively mediate the mechanical behaviors in face-centered-cubic(fcc)metals.However,the experimental investigation concerning the roles of twin boundary(TB)during deformation is rarely reported.Here,with the joint efforts of in-situ nanomechani-cal testing and theoretical studies,we provide a systematic investigation regarding the effects of TB orien-tation(θ,the angle between tensile loading direction and the normal of TB)and spacing on deformation mechanisms in Ni nanowires(NWs).As compared with single-crystalline counterparts,it is found that nano-twinned(nt)NWs withθ∼0°exhibit limited ductility,whereas TB can serve as an effective block-age to the dislocation propagation.In contrast,in nt NWs withθ∼20°and 55°,TB migration/detwinning induced by TB-dislocation reaction or partial dislocation movement dominates the plasticity,which con-tributes to enhanced NW ductility.Regarding nt NWs withθ∼90°,dislocations are found to be able to transmit through the TBs,suggesting the limited effect of TB on the NW stretchability.Furthermore,de-creasing TB spacing(λ)can facilitate the detwinning process and thus greatly enhance the ductility of NW withθ∼55°.This study uncovers the distinct roles that TB can play during mechanical deforma-tions in fcc NWs and provides an atomistic view into the direct linkage between macroscopic mechanical properties and microscopic deformation modes.

关键词： In-situ tension test Twin orientation Twin boundary migration Ductility Nano-twinned Ni nanowires

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Electronic Coupling of Single Atom and FePS_3 Boosts Water Electrolysis

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Energy & Environmental Materials 2022年第3期5卷 899-905页

作者： Chongyang Tang Dong He Nan Zhang Xianyin Song shuangfeng jia Zunjian Ke jiangchao Liu jianbo Wang Changzhong jiang Ziyu Wang Xiaoqing Huang Xiangheng Xiao School of Physics and Technology Wuhan UniversityWuhan 430072China The Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122China Institute of Technological Sciences Wuhan UniversityWuhan 430072China State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

Engineering the electronic structure of surface active sites at the atomic level can be an efficient way to modulate the reactivity of catalysts.Herein,we report the rational tuning of surface electronic structure of FePS_(3) nanosheets(NSs)by anchoring atomically dispersed metal atom.Theoretical calculations predict that the strong electronic coupling effect in single-atom Ni-FePS_(3) facilitates electron aggregation from Fe atom to the nearby Ni-S bond and enhances the electron-transfer of Ni and S sites,which balances the oxygen species adsorption capacity,reinforces water adsorption and dissociation process to accelerate corresponding oxygen evolution reaction(OER)and hydrogen evolution reaction(HER).The optimal Ni-FePS_(3)NSs/C exhibits outstanding electrochemical water-splitting activities,delivering an overpotential of 287 mV at the current density of 10 mA cm^(-2) and a Tafel slope of 41.1 mV dec^(-1) for OER;as well as an overpotential decrease of 219 mV for HER compared with pure FePS_(3)NSs/C.The concept of electronic coupling interaction between the substrate and implanted single active species offers an additional method for catalyst design and beyond.

关键词： electronic coupling iron thiophosphates nanosheet single atom water electrolysis

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General synthesis of 2D rare-earth oxide single crystals with tailorable facets

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National Science Review 2022年第5期9卷 22-29页

作者： Linyang Li Fangyun Lu Wenqi Xiong Yu Ding Yangyi Lu Yao Xiao Xin Tong Yao Wang shuangfeng jia jianbo Wang Rafael G.Mendes Mark H.Rümmeli Shengjun Yuan Mengqi Zeng Lei Fu College of Chemistry and Molecular Sciences Wuhan University Key Laboratory of Artificial Micro-and Nano-Structures of Ministry of Education and School of Physics and Technology Wuhan University The Institute for Advanced Studies Wuhan University College of Physics Optoelectronics and Energy and Collaborative Innovation Center of Suzhou Nano Science and TechnologySoochow University Institute for Complex Materials IFW Dresden Centre of Polymer and Carbon Materials Polish Academy of Sciences Institute of Environmental Technology VSB-Technical University of Ostrava

Two-dimensional(2D) rare-earth oxides(REOs) are a large family of materials with various intriguing applications and precise facet control is essential for investigating new properties in the 2D limit.However,a bottleneck remains with regard to obtaining their 2D single crystals with specific facets because of the intrinsic non-layered structure and disparate thermodynamic stability of different facets.Herein,for the first time,we achieve the synthesis of a wide variety of high-quality 2D REO single crystals with tailorable facets via designing a hard-soft-acid-base couple for controlling the 2D nucleation of the predetermined facets and adjusting the growth mode and direction of crystals.Also,the facet-related magnetic properties of 2D REO single crystals were revealed.Our approach provides a foundation for further exploring other facet-dependent properties and various applications of 2D REO,as well as inspiration for the precise growth of other non-layered 2D materials.

关键词： 2D materials cerium crystal engineering rare earth CVD

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Atomic-scale observation of a two-stage oxidation process in Cu2O

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Nano Research 2017年第7期10卷 2344-2350页

作者： Huihui Liu He Zheng Lei Li Huaping Sheng shuangfeng jia Fan Cao Xi Liu Boyun Chen Ru Xing Dongshan Zhao jianbo Wang School of Physics and Technology Center for Electron Microscopy and MOE Key Laboratory of Artificial Micro- and Nano-structures and Institute for Advanced Studies Wuhan University Wuhan 430072 China Middle School Attached to Huazhong University of Science and Technology Wuhan 430074 China Shuiguohu Senior Middle School Wuhan 430071 China The Department of Physics Science and Technology Baotou Normal College Baotou 014030 China Science and Technology on High Strength Structural Materials Laboratory Central South University Changsha 410083 China

Atomic-scale oxidation dynamics of Cu2O nanocrystallines （NCs） are directly observed by in situ high-resolution transmission electron microscopy. A two-stage oxidation process is observed：（1）The initial oxidation stage is dominated by the dislocation-mediated oxidation behavior of Cu2O NCs via solid-solid transformations, leading to the formation of a new intermediate CuOx phase. The possible crystal structure of the CuOx phase is discussed. （2） Subsequently, CuOx is transformed into CuO by layer-by-layer oxidation. These results will help in understanding the oxidation mechanisms of copper oxides and pave the way for improving their structural diversity and exploiting their potential industrial applications.

关键词： oxidation,in situ electron microscopy,Cu2O,intermediated phases

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Structural evolution of low-dimensional metal oxide semiconductors under external stress

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Journal of Semiconductors 2022年第4期43卷 60-66页

作者： Peili Zhao Lei Li Guoxujia Chen Xiaoxi Guan Ying Zhang Weiwei Meng Ligong Zhao Kaixuan Li Renhui jiang shuangfeng jia He Zheng jianbo Wang School of Physics and Technology Center for Electron MicroscopyMOE Key Laboratory of Artificial Micro-and Nano-structuresand Institute for Advanced StudiesWuhan UniversityWuhan 430072China Suzhou Institute of Wuhan University Suzhou 215123China Wuhan University Shenzhen Research Institute Shenzhen 518057China

Metal oxide semiconductors(MOSs) are attractive candidates as functional parts and connections in nanodevices.Upon spatial dimensionality reduction, the ubiquitous strain encountered in physical reality may result in structural instability and thus degrade the performance of MOS. Hence, the basic insight into the structural evolutions of low-dimensional MOS is a prerequisite for extensive applications, which unfortunately remains largely unexplored. Herein, we review the recent progress regarding the mechanical deformation mechanisms in MOSs, such as CuO and ZnO nanowires(NWs). We report the phase transformation of CuO NWs resulting from oxygen vacancy migration under compressive stress and the tensile strain-induced phase transition in ZnO NWs. Moreover, the influence of electron beam irradiation on interpreting the mechanical behaviors is discussed.

关键词： metal oxide semiconductor phase transition strain nanowire in-situ transmission electron microscopy

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Atomistic insight into ordered defect superstructures at novel grain boundaries in CuO nanosheets: From structures to electronic properties

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Nano Research 2019年第5期12卷 1099-1104页

作者： Lulu Zhao Lei Li Huaping Sheng He Zheng shuangfeng jia Weiwei Meng Huihui Liu Fan Cao Huayu Peng jianbo Wang School of Physics and Technology Center for Electron MicroscopyMOE Key Laboratory of Artificial Micro-and Nano-structuresand Institute for Advanced StudiesWuhan UniversityWuhan 430072China Science and Technology on High Strength Structural Materials Laboratory Central South UniversityChangsha 410083China

Determining atomistic structures of grain boundaries (GBs) is essential to understand structure--property interplay in oxides.Here,different GB superstructures in CuO nanosheets,including (111) and (114) twinning boundaries (TBs) and (002)/(223) GB,are investigated.Unlike the lower-energy stoichiometric (111) TB,both experimental and first-principles investigations reveal a severe segregation of Cu and O vacancies and a nonstoichiometric property at (114) TB,which may facilitate ionic transportation and provide space for elemental segregation.More importantly,the calculated electronic structures have shown the increased conductivity as well as the unanticipated magnetism in both (114) TB and (002)/(223) GB.These findings could contribute to the race towards the property-directing structural design by GB engineering.

关键词： grain boundarie satomistic structure electronic property scanning transmission electron microscopy (STEM) first-principles

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