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Self-supporting, eutectic-like, nanoporous biphase bismuth-tin film for high-performance magnesium storage

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Nano Research 2019年第4期12卷 801-808页

作者： Meijia Song Jiazheng Niu Kuibo Yin Hui Gao Chi Zhang Wensheng Ma Fakui Luo Zhangquan Peng Zhonghua Zhang Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education) School of Materials Science and Engineering Shandong University Jingshi Road 17923 Jinan 250061 China SEU-FEI Nano-pico center Key Lab of MEMS of Ministry of Education Southeast University Nanjing 210096 China School of Applied Physics and Materials Wuyi University Dongcheng Village 22 Jiangmen 529020 China State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China

Magnesium ion batteries are emerging as promising alternatives to lithium ion batteries because of their advantages including high energydensity,dendrite-free features and low ***,one of the major challenges for magnesium ion batteries is the kinetically sluggishmagnesium insertion/extraction and diffusion in electrode *** at this issue,biphase eutectic-like bismuth-tin film is designedherein to construct a self-supporting anode with interdigitated phase distribution and hierarchically porous structure,and further fabricated bya facile one-step magnetron cosputtering *** benchmarked with single-phase bismuth or tin film,the biphase bismuth-tin film delivershigh specific capacity (538 mAh/g at 50 mA/g),excellent rate performance (417 mAh/g at 1,000 mA/g) and good cycling stability (233 mAh/gat the 200th cycle).The superior magnesium storage performance of the sputtered bismuth-tin film could be attributed to the synergetic effectof the interdigitated bismuth/tin phase distribution,hierarchically porous structure and biphase buffering matrices,which could increase ionictransport channels,shorten diffusion lengths and reduce total volume changes.

关键词： magnesiumion batteries alloying-type anode biphase bismuth-tin film hierarchically porous structure magnetron cosputtering

Ultrasensitive graphene-Si position-sensitive detector for motion tracking

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InfoMat 2020年第4期2卷 761-768页

作者： Wenhui Wang Kaiyang Liu Jie Jiang Ruxia Du Litao Sun Wei Chen Junpeng Lu Zhenhua Ni School of Physics and Key Laboratory of MEMS of the Ministry of Education Southeast UniversityNanjingChina Centre for Functional Materials National University of Singapore(Suzhou)Research InstituteSuzhou Industrial ParkJiangsuChina Department of Basic Teaching Nanjing Tech University Pujiang InstituteNanjingChina SEU-FEI Nano-pico center Key Laboratory of MEMS of Ministry of EducationCollaborative Innovation Center for Micro/Nano FabricationDevice and SystemSoutheast UniversityNanjingChina Department of Chemistry National University of SingaporeSingaporeSingapore

Motion tracking has attracted great attention in the fields of real-time tracking,nanorobotics,and targeted *** achieving more accurate motion tracking,the highly sensitive position-sensitive detector(PSD)is ***,we demonstrate a meliorated PSD based on graphene-Si heterojunction for motion *** position sensitivity of PSD was improved by employing surface engineering of *** modulating the transport property of graphene,nearly 20-fold increase of sensitivity was achieved under weak light,and at the same time,the detection limit power was reduced to^2 nW.A motion tracking system was developed based on the improved PSD,and human arm swing was tracked,which demonstrated high sensitivity and real-time tracking capabilities of the *** addition,the PSD can support up to^10 kHz high-frequency *** work provides a new strategy for improving the performance of PSD,and promotes the development of two-dimensional materials in novel optoelectronic devices.

关键词： graphene heterojunction motion tracking oxygen plasma position-sensitive detectors

Liquid dynamics and glass formation of Gd_(55)Co_(20)Al_(25)metallic glass with minor Si addition

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Journal of Materials Science & Technology 2021年第18期77卷 28-37页

作者： Lin Xue Liliang Shao Qiang Luo Lina Hu Yunbo Zhao Kuibo Yin Mingyun Zhu Litao Sun Baolong Shen Xiufang Bian School of Materials Science and Engineering Jiangsu Key Laboratory of Advanced Metallic MaterialsSoutheast UniversityNanjing 211189China School of Materials Science and Engineering Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education)Shandong UniversityJinan 250061China SEU-FEI Nano-pico center Key Laboratory of MEMS of Ministry of EducationSchool of Electronic Science and EngineeringSoutheast UniversityNanjing 210018China Institute of Massive Amorphous Metal Science.China University of Mining and Technology.Xuzhou 221116 China

Liquid dynamics plays an essential role in glass *** we observed a distinct change of liquid dynamics in Gd_(55)Co_(20)Al_(25)metallic glass induced by microalloying Si *** the equilibrium melt,minor Si(0.5 at.%)addition leads to a more fragile liquid behavior and a smaller strength of liquid-liquid transition with the transition strength(F)decreasing from 0.76 to ***,in the supercooled liquid,Si-doped liquid exhibits a remarkable enhanced fragile-to-strong transition(FST),and the value of FST factor f increases sharply from 1.63 to 3.84,resulting in a stronger liquid behavior and more sluggish crystallization kinetics for Gd_(55)Co_(20)Al_(24.5)Si_(0.5)metallic ***,minor Si addition promotes the formation of a crystal-like structure with a size of 1-2 *** interactions between the crystal-like structures and other local favored clusters frustrate the further growth of crystal-like phases,thus stabilizes the amorphous *** a result,the glass-forming ability(GFA)was largely *** critical diameter of Gd_(55)Co_(20)Al_(25)metallic glass increased from 2 to 7 mm with 0.5 at.%Si addition without deterioration of the magnetocaloric *** study provides valuable insight for understanding the distinct effect of microalloying on GFA of metallic glasses from the aspect of the evolution of the liquid.

关键词： Glass-forming ability Liquid-liquid transition Fragile-to-strong transition Viscosity Relaxation

Dual-channel type tunable field-effect transistors based on vertical bilayer WS2(1−x)Se2x/SnS2 heterostructures

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InfoMat 2020年第4期2卷 752-760页

作者： Biyuan Zheng Dong Li Chenguang Zhu Jianyue Lan Xingxia Sun Weihao Zheng Huawei Liu Xuehong Zhang Xiaoli Zhu Yexin Feng Tao Xu Litao Sun Gengzhao Xu Xiao Wang Chao Ma Anlian Pan Key Laboratory for Micro-Nano Physics and Technology of Hunan Province State Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Materials Science and EngineeringHunan UniversityChangshaChina School of Physics and Electronics Hunan UniversityChangshaChina Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of SciencesSuzhouChina SEU-FEI Nano-pico center Key Laboratory of MEMS of Ministry of EducationSoutheast UniversityNanjingChina

Layered semiconductor heterostructures are essential elements in modern electronic and optoelectronic *** engineering the composition of these heterostructures may enable the flexible design of the properties of heterostructure-based electronics and optoelectronics as well as their ***,we report for the first time a two-step chemical vapor deposition approach for a series of WS2(1−x)Se2x/SnS2 vertical heterostructures with high-quality and large *** steady-state photoluminescence results exhibit an obvious composition-related quenching ratio,revealing a strong coherence between the band offset and the charge transfer efficiency at the junction *** on the achieved heterostructures,dual-channel backgate field-effect transistors were successfully designed and exhibited typical composition-dependent transport behaviors,and pure n-type unipolar transistors to ambipolar transistors were realized in such *** direct vapor growth of these novel vertical WS2(1−x)Se2x/SnS2 heterostructures could offer an interesting system for probing new physical properties and provide a series of layered heterostructures for high-quality devices.

关键词： dual channel field-effect transistor heterostructure semiconductor alloy two-dimensional materials

Freeze-thaw cycles and associated geomorphology in a post-glacial environment:current glacial,paraglacial,periglacial and proglacial scenarios at pico de Orizaba volcano,Mexico

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Journal of Mountain Science 2024年第6期21卷 1954-1977页

作者： Víctor SOTO Carlos M.WELSH R. Kenji YOSHIKAWA Hugo DELGADO GRANADOS Centro de Ciencias de la Tierra Universidad VeracruzanaCircuito Gonzalo Aguirre BeltránS/NZona Universitaria91090XalapaMéxico Water and Environmental Research center University of Alaska FairbanksFairbanksAlaska 99775USA Instituto de Geofísica Universidad Nacional Autónoma de MéxicoCiudad de México 04150México Department of Earth and Environmental Sciences Ludwig Maximilians UniversitätMunich 80333Germany

The glacial history of pico de Orizaba indicates that during the Last Glacial Maximum,its icecap covered up to~3000 m asl;due to the air temperature increasing,its main glacier has retreated to 5050 m *** retraction of the glacier has left behind an intense climatic instability that causes a high frequency of freeze-thaw cycles of great intensity;the resulting geomorphological processes are represented by the fragmentation of the bedrock that occupies the upper parts of the *** is a notable lack of studies regarding the fragmentation and erosion occurring in tropical high mountains,and the associated geomorphological risks;for this reason,as a first stage of future continuous research,this study analyzes the freezing and thawing cycles that occur above 4000 m asl,through continuous monitoring of surface ground *** results allow us to identify and characterize four zones:glacial,paraglacial,periglacial and *** was found that the paraglacial zone presents an intense drop of temperature,of up to~9℃ in only sixty *** rock fatigue and intense freeze-thaw cycles that occur in this area are responsible for the high rate of rock disintegration and represent the main factor of the constant slope dynamics that occur at the *** activity decreases,both in frequency and intensity,according to the distance to the glacier,which is where the temperature presents a certain degree of stability,until reaching the proglacial zone,where cycles are almost non-existent,and therefore there is no gelifraction *** geomorphological processes have resulted in significant alterations to the mountain slopes,which can have severe consequences in terms of risk and water.

关键词： Freeze-Thaw Gelifraction Mountain mechanical erosion Periglacial geomorphology Postglacial scenarios

Single-element amorphous palladium nanoparticles formed via phase separation

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Nano Research 2022年第6期15卷 5575-5580页

作者： Dong Sheng He Yi Huang Benjamin D.Myers Dieter Isheim Xinyu Fan Guang-Jie Xia Yunsheng Deng Lin Xie Shaobo Han Yang Qiu Yang-Gang Wang Junhua Luan Zengbao Jiao Li Huang Vinayak P.Dravid Jiaqing He pico center and Department of Physics Southern University of Science and TechnologyShenzhen 518055China Department of Materials Science and Engineering Northwestern UniversityEvanstonIL 60208USA Department of Chemistry and Guangdong Provincial Key Laboratory of Catalytic Chemistry Southern University of Science and TechnologyShenzhen 518055China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Materials Science and Engineering City University of Hong KongHong KongChina Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina

Physically vitrifying amorphous single-element metal requires ultrahigh cooling rates,which are still unachievable for most of the closest-packed ***,we report a facile chemical synthetic strategy for single-element amorphous palladium nanoparticles with a purity of 99.35 at.%±0.23 at.%from palladium–silicon liquid ***-situ transmission electron microscopy directly detected the solidification of palladium and the separation of *** hydrogen absorption experiment showed that the amorphous palladium expanded little upon hydrogen uptake,exhibiting a great potential application for hydrogen *** results provide insight into the formation of amorphous metal at nanoscale.

关键词： Pd single-element metallic glass nanoparticle phase separation undercooling

Stoichiometric effect on electrical and near-infrared photodetection properties of full-composition-range GaAs1−xSbx nanowires

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Nano Research 2021年第11期14卷 3961-3968页

作者： Jiamin Sun Mingming Han Meng Peng Lei Zhang Dong Liu Chengcheng Miao Jiafu Ye Zhiyong Pang Longbing He Hailu Wang Qing Li Peng Wang Lin Wang Xiaoshuang Chen Chongxin Shan Litao Sun Weida Hu Zai-xing Yang School of Physics and School of Microelectronics Shandong UniversityJinan250100China State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai200083China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan430074China SEU-FEI Nano-pico center Key Lab of MEMS of Ministry of EducationCollaborative Innovation Center for Micro/Nano FabricationDevice and SystemSoutheast UniversityNanjing210096China School of Physics and Photoelectric Engineering Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou310024China Henan Key Laboratory of Diamond Optoelectronic Materials and Devices School of Physics and EngineeringZhengzhou UniversityZhengzhou450001China

As one of the most important narrow bandgap ternary semiconductors, GaAs1−xSbx nanowires (NWs) have attracted extensive attention recently, due to the superior hole mobility and the tunable bandgap, which covers the whole near-infrared (NIR) region, for technological applications in next-generation high-performance electronics and NIR photodetection. However, it is still a challenge to the synthesis of high-quality GaAs1−xSbx NWs across the entire range of composition, resulting in the lack of correlation investigation among stoichiometry, microstructure, electronics, and NIR photodetection. Here, we demonstrate the success growth of high-quality GaAs1−xSbx NWs with full composition range by adopting a simple and low-cost surfactant-assisted solid source chemical vapor deposition method. All of the as-prepared NWs are uniform, smooth, and straight, without any phase segregation in all stoichiometric compositions. The lattice constants of each NW composition have been well correlated with the chemical stoichiometry and confirmed by high-resolution transmission electron microscopy, X-ray diffraction, and Raman spectrum. Moreover, with the increase of Sb concentration, the hole mobility of the as-fabricated field-effect-transistors and the responsivity and detectivity of the as-fabricated NIR photodetectors increase accordingly. All the results suggest a careful stoichiometric design is required for achieving optimal NW device performances.

关键词： GaAs1−xSbx nanowire stoichiometry effect full-composition-range field-effect hole mobility near-infrared photodetection

Dealloying-constructed hierarchical nanoporous bismuth-antimony anode for potassium ion batteries

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Fundamental Research 2021年第4期1卷 408-417页

作者： Hui Gao Kuibo Yin Zhiyuan Guo Ying Zhang Wensheng Ma Wanfeng Yang Ke Sun Zhangquan Peng Zhonghua Zhang Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJingshi Road 17923Jinan 250061China SEU-FEI Nano-pico center Key Lab of MEMS of Ministry of EducationSoutheast UniversityNanjing 210096China Laboratory of Advanced Spectro-electrochemistry and Li-ion Batteries Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

Bi-Sb alloys are appealing anode materials for potassium ion batteries(PIBs)but challenged by their enormous volumetric variation during ***,a facile one-step dealloying protocol was devised and utilized to prepare the Bi-Sb alloys that manifest an exotic bicontinuous hierarchical nanoporous(np)microstructure ideal for volume-change mitigation and K+transport *** growth mechanism fostering the peculiar morphology of the np-(Bi,Sb)alloys was investigated and clarified via operando X-ray(XRD)and ex-situ scanning electron microscopy(SEM).In particular,the np-Bi6Sb2 electrode,optimized for comprehensive electrochemical performance,achieves decent reversible capacities and a superior lifespan,as benchmarked with the monometallic references and other Bi-Sb alloy ***(de)potassiation mechanism of the np-(Bi,Sb)alloys was studied by operando XRD and further rationalized by density functional theory(DFT)calculations,whereby a homogeneous(segregation-free)and robust two-step electrochemically-driven phase transformations’catenation of(Bi,Sb)↔K(Bi,Sb)2↔K3(Bi,Sb)was reliably established to substantiate the outstanding reversibility of the np-(Bi,Sb)anodes in PIBs.

关键词： Potassium ion battery Bismuth-antimony anodes Density functional theory Dealloying Operando X-ray diffraction

In situ atomic-scale observation of monolayer graphene growth from SiC

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Nano Research 2018年第5期11卷 2809-2820页

作者： Kaihao Yu Wen Zhao Xing Wu Jianing Zhuang Xiaohui Hu Qiubo Zhang Jun Sun Tao Xu Yang Chai Feng Ding Litao Sun SEU-FEI Nano-pico center Key Laboratory of MEMS of Ministry of Education School of Electronic Science and Engineering Southeast University Nanjing 210096 China center for Multidimensional Carbon Materials Institute for Basic Science Ulsan 689-798 Republic of Korea School of Materials Science and Engineering Ulsan National Institute of Science and Technology Ulsan 689-798 Republic of Korea Institute of Textiles and Clothing The Hong Kong Polytechnic University Hong Kong 999077 China Shanghai Key Laboratory of Multidimensional Information Processing Department of Electrical Engineering East China Normal University Shanghai 200241 China College of Materials Science and Engineering Nanjing Tech University Nanjing 210009 China center for Advanced Carbon Materials Southeast University and Jiangnan Graphene Research Institute Changzhou 213100 China center for Advanced Materials and Manufacture Joint Research Institute of Southeast University and Monash University Suzhou 215123 China Department of Applied Physics The Hang Kong Polytechnic University Hang Kong 999077 China

Because of its high compatibility with conventional microfabrication processing technology, epitaxial graphene （EG） grown on SiC shows exceptional promise for graphene-based electronics. However, to date, a detailed understanding of the transformation from three-layer SiC to monolayer graphene is still lacking. Here, we demonstrate the direct atomic-scale observation of EG growth on a SiC （11^-00） surface at 1,000℃ by in situ transmission electron microscopy in combination with ab initio molecular dynamics （AIMD） simulations. Our detailed analysis of the growth dynamics of monolayer graphene reveals that three SiC （11^-00） layers decompose successively to form one graphene layer. Sublimation of the first layer causes the formation of carbon clusters containing short chains and hexagonal rings, which can be considered as the nuclei for graphene growth. Decomposition of the second layer results in the appearance of new chains connecting to the as-formed clusters and the formation of a network with large pores. Finally, the carbon atoms released from the third layer lead to the disappearance of the chains and large pores in the network, resulting in a whole graphene layer. Our study presents a clear picture of the epitaxial growth of the monolayer graphene from SiC and provides valuable information for future developments in SiC-derived EG technology.

关键词： graphene epitaxial growth in situ transmissionelectron microscopy