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Analysis of the Minute Differences between the Internal Structures of Green-Emitting Quantum Dots Via Synchrotron-Based X-Ray Photoelectron Spectroscopy 认领 引用
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作者 Dong-Jin Yun Nayoun Won +10 位作者 Young Mo Sung Tae-Gon Kim Taekhoon Kim Ane Etxebarria Kyungjae Lee SooHwan Sul Hyokeun Park SungJun Park Jung-Hwa Kim Shinae Jun Ethan Crumlin 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2025年第1期313-322,共10页
The development of an analytical method for determining the properties of quantum dots(QDs)is crucial for improving the optical performance of QD-based displays.Therefore,synchrotron-based X-ray photoelectron spectros... The development of an analytical method for determining the properties of quantum dots(QDs)is crucial for improving the optical performance of QD-based displays.Therefore,synchrotron-based X-ray photoelectron spectroscopy(XPS)is designed here to accurately characterize the chemical and structural differences between different QDs.This method enables the determination of the reason for the minimal differences between the optical properties of different QDs depending on the synthesis process,which is difficult to determine using conventional methods alone.Combined with model simulations,the XPS spectra obtained at different photon energies reveal the internal structures and chemical-state distributions of the QDs.In particular,the QD synthesized under optimal conditions demonstrates a relatively lower degree of oxidation of the core and more uniformly stacked ZnSe/ZnS shell layers.The internal structures and chemical-state distributions of QDs are closely related to their optical properties.Finally,the synchrotron-based XPS proposed here can be applied to compare nearly equivalent QDs with slightly different optical properties. 展开更多
关键词 chemical state indium phosphide-based quantum dot inelastic mean free path internal structure synchrotron-based X-ray photoelectron spectroscopy
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Uncovering the Critical Role of Ni on Surface Lattice Stability in Anionic Redox Active Li1.2Ni0.2Mn0.6O2 认领 引用 被引量：2
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作者 Peirong Li Yande Li +14 位作者 Qi Liang Yize Niu Shun Zheng Zengqing Zhuo Yunhong Luo Bocheng Liang Dong Yang Jixiang Yin Supeng Chen Wanneng Ye Yuanyuan Pan Qinghao Li Pengfei Yu Xiaosong Liu Qiang Li 《Carbon Energy》 SCIE EI CSCD 2025年第6期160-170,共11页
Anionic redox reaction(ARR)can provide extra capacity beyond transition metal(TM)redox in lithium-rich TM oxide cathodes.Practical ARR application is much hindered by the structure instability,particularly at the surf... Anionic redox reaction(ARR)can provide extra capacity beyond transition metal(TM)redox in lithium-rich TM oxide cathodes.Practical ARR application is much hindered by the structure instability,particularly at the surface.Oxygen release has been widely accepted as the ringleader of surficial structure instability.However,the role of TM in surface stability has been much overlooked,not to mention its interplay with oxygen release.Herein,TM dissolution and oxygen release are comparatively investigated in Li1.2Ni0.2Mn0.6O2.Ni is verified to detach from the lattice counter-intuitively despite the overwhelming stoichiometry of Mn,facilitating subsequent oxygen release of the ARR process.Intriguingly,surface reorganization occurs following regulated Ni dissolution,enabling the stabilization of the surface and elimination of oxygen release in turn.Accordingly,a novel optimization strategy is proposed by adding a relaxation step at 4.50 V within the first cycle procedure.Battery performance can be effectively improved,with voltage decay suppressed from 3.44 mV/cycle to 1.60 mV/cycle,and cycle stability improved from 66.77%to 90.01%after 100 cycles.This work provides new perspectives for clarifying ARR surface instability and guidance for optimizing ARR performance. 展开更多
关键词 anionic redox reaction oxygen release surface reorganization TM dissolution
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Aging impairs the osteocytic regulation of collagen integrity and bone quality 认领 引用 被引量：7
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作者 Charles A.Schurman Serra Kaya +12 位作者 Neha Dole Nadja M.Maldonado Luna Natalia Castillo Ryan Potter Jacob P.Rose Joanna Bons Christina D.King Jordan B.Burton Birgit Schilling Simon Melov Simon Tang Eric Schaible Tamara Alliston 《Bone Research》 SCIE CAS CSCD 2024年第1期78-94,共17页
Poor bone quality is a major factor in skeletal fragility in elderly individuals.The molecular mechanisms that establish and maintain bone quality,independent of bone mass,are unknown but are thought to be primarily d... Poor bone quality is a major factor in skeletal fragility in elderly individuals.The molecular mechanisms that establish and maintain bone quality,independent of bone mass,are unknown but are thought to be primarily determined by osteocytes.We hypothesize that the age-related decline in bone quality results from the suppression of osteocyte perilacunar/canalicular remodeling(PLR),which maintains bone material properties.We examined bones from young and aged mice with osteocyte-intrinsic repression of TGFβsignaling(TβRIIocy−/−)that suppresses PLR.The control aged bone displayed decreased TGFβsignaling and PLR,but aging did not worsen the existing PLR suppression in male TβRIIocy−/−bone.This relationship impacted the behavior of collagen material at the nanoscale and tissue scale in macromechanical tests.The effects of age on bone mass,density,and mineral material behavior were independent of osteocytic TGFβ.We determined that the decline in bone quality with age arises from the loss of osteocyte function and the loss of TGFβ-dependent maintenance of collagen integrity. 展开更多
关键词 maintain primarily integrity
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Photon-in/photon-out endstation for studies of energy materials at beamline 02B02 of Shanghai Synchrotron Radiation Facility 认领 引用 被引量：4
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作者 Guoxi Ren Nian Zhang +6 位作者 Xuefei Feng Hui Zhang Pengfei Yu Shun Zheng Deng Zhou Zongwang Tian Xiaosong Liu 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第1期62-69,共8页
A new photon-in/photon-out endstation at beamline 02B02 of the Shanghai Synchrotron Radiation Facility for studying the electronic structure of energy materials has been constructed and fully opened to users.The endst... A new photon-in/photon-out endstation at beamline 02B02 of the Shanghai Synchrotron Radiation Facility for studying the electronic structure of energy materials has been constructed and fully opened to users.The endstation has the capability to perform soft x-ray absorption spectroscopy in total electron yield and total fluorescence yield modes simultaneously.The photon energy ranges from 40 eV to 2000 eV covering the K-edge of most low Z-elements and the L-edge of 3d transition-metals.The new self-designed channeltron detector allows us to achieve good fluorescence signals at the low photon flux.In addition,we synchronously collect the signals of a standard reference sample and a gold mesh on the upstream to calibrate the photon energy and monitor the beam fluctuation,respectively.In order to cross the pressure gap,in situ gas and liquid cells for soft x-ray absorption spectroscopy are developed to study the samples under realistic working conditions. 展开更多
关键词 soft x-ray absorption energy materials photon-in/photon-out in situ cell
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Dual-shell silicate and alumina coating for long lasting and high capacity lithium ion batteries 认领 引用 被引量：3
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作者 Marcos Lucero Tucker M.Holstun +7 位作者 Yudong Yao Ryan Faase Maoyu Wang Alpha T.N’Diaye David P.Cann Joe Baio Junjing Deng Zhenxing Feng 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第5期314-323,共10页
Here we demonstrate a theory-driven, novel dual-shell coating system of Li2SrSiO4 and Al2O3, achieved via a facile and scalable sol-gel technique on LiCoO2 electrode particles. The optimal thickness of ... Here we demonstrate a theory-driven, novel dual-shell coating system of Li2SrSiO4 and Al2O3, achieved via a facile and scalable sol-gel technique on LiCoO2 electrode particles. The optimal thickness of each coating can lead to increased specific capacity(~185 m Ah/g at 0.5 C-rate) at a cut-off potential of 4.5 V, and greater cycling stability at very high C rates(up to 10 C) in half-cells with lithium metal. The mechanism of this superior performance was investigated using a combination of X-ray and electron characterization methods. It shows that the results of this investigation can inform future studies to identify still better dual-shell coating schemes, achieved by such industrially feasible techniques, for application on similar, nickel-rich cathode materials. 展开更多
关键词 Lithium cobalt oxide Surface coating Sol-gel Silicate Alumina X-ray absorption spectroscopy
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Precisely quantifying bulk transition metal valence evolution in conventional battery electrode by inverse partial fluorescence yield 认领 引用 被引量：1
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作者 Kehua Dai Weiwei Shao +7 位作者 Beibei Zhao Wenjuan Zhang Yan Feng Wenfeng Mao Guo Ai Gao Liu Jing Mao Wanli Yang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第6期363-368,I0010,共6页
Precisely quantifying transition metal(TM) redox in bulk is a key to understand the fundamental of optimizing cathode materials in secondary batteries. At present, the commonly used methods to probe TM redox are hard ... Precisely quantifying transition metal(TM) redox in bulk is a key to understand the fundamental of optimizing cathode materials in secondary batteries. At present, the commonly used methods to probe TM redox are hard X-ray absorption spectroscopy(hXAS) and soft X-ray absorption spectroscopy(sXAS).However, they are both facing challenges to precisely quantify the valence states of some transition metals such as Mn. In this paper, Mn-L iPFY(inverse partial fluorescence yield) spectra extracted from Mn-L m RIXS(mapping of resonant inelastic X-ray scattering) is adopted to quantify Mn valence states. Mn-L i PFY spectra has been considered as a bulk-sensitive, non-distorted probe of TM valence states.However, the exact precision of this method is still unclear in quantifying practical battery electrodes.Herein, a series of LiMn2O4 electrodes with different charge and discharge states are prepared. Based on their electrochemical capacity(generally considered to be very precise), the precision of Mn iPFY in quantifying bulk Mn valence state is confirmed, and the error range is unraveled. Mn-L mRIXS iPFY thus is identified as one of the best methods to quantify the bulk Mn valence state comparing with hXAS and sXAS. 展开更多
关键词 Cathode materials Valence state of transition metals Lithium-ion batteries Mapping of resonant inelastic X-ray scattering Inverse partial fluorescence yield
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Electronic structure and spatial inhomogeneity of iron-based superconductor FeS 认领 引用 被引量：1
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作者 Chengwei Wang Meixiao Wang +12 位作者 Juan Jiang Haifeng Yang Lexian Yang Wujun Shi Xiaofang Lai Sung-Kwan Mo Alexei Barinov Binghai Yan Zhi Liu Fuqiang Huang Jinfeng Jia Zhongkai Liu Yulin Chen 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第4期110-115,共6页
Iron-based superconductor family FeX(X=S,Se,Te)has been one of the research foci in physics and material science due to their record-breaking superconducting temperature(FeSe film)and rich physical phenomena.Recently,... Iron-based superconductor family FeX(X=S,Se,Te)has been one of the research foci in physics and material science due to their record-breaking superconducting temperature(FeSe film)and rich physical phenomena.Recently,FeS,the least studied Fe X compound(due to the difficulty in synthesizing high quality macroscopic crystals)attracted much attention because of its puzzling superconducting pairing symmetry.In this work,combining scanning tunneling microscopy and angle resolved photoemission spectroscopy(ARPES)with sub-micron spatial resolution,we investigate the intrinsic electronic structures of superconducting FeS from individual single crystalline domains.Unlike FeTe or FeSe,FeS remains identical tetragonal structure from room temperature down to 5 K,and the band structures observed can be well reproduced by our ab-initio calculations.Remarkably,mixed with the 1×1 tetragonal metallic phase,we also observe the coexistence of √5×√5 reconstructed insulating phase in the crystal,which not only helps explain the unusual properties of FeS,but also demonstrates the importance of using spatially resolved experimental tools in the study of this compound. 展开更多
关键词 angle-resolved photoemission with spatially resolution scanning tunneling microscopy iron-based superconductor electronic band structure
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Charge compensation and capacity fading in LiCoO2 at high voltage investigated by soft x-ray absorption spectroscopy 认领 引用 被引量：1
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作者 Xing-Hui Long Yan-Ru Wu +10 位作者 Nian Zhang Peng-Fei Yu Xue-Fei Feng Shun Zheng Jia-Min Fu Xiao-Song Liu Na Liu Meng Wang Lei-Min Xu Jin-Ming Chen Jenn-Min Lee 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第10期590-597,共8页
In order to obtain an in-depth insight into the mechanism of charge compensation and capacity fading in LiCoO2, the evolution of electronic structure of LiCoO2 at different cutoff voltages and after different cycles a... In order to obtain an in-depth insight into the mechanism of charge compensation and capacity fading in LiCoO2, the evolution of electronic structure of LiCoO2 at different cutoff voltages and after different cycles are studied by soft x-ray absorption spectroscopy in total electron（TEY） and fluorescence（TFY） detection modes, which provide surface and bulk information, respectively. The spectra of Co L2,3-edge indicate that Co contributes to charge compensation below 4.4 V.Combining with the spectra of O K-edge, it manifests that only O contributes to electron compensation above 4.4 V with the formation of local O 2 p holes both on the surface and in the bulk, where the surficial O evolves more remarkably. The evolution of the O 2 p holes gives an explanation to the origin of O2^-or even O2. A comparison between the TEY and TFY of O K-edge spectra of LiCoO2 cycled in a range from 3 V to 4.6 V indicates both the structural change in the bulk and aggregation of lithium salts on the electrode surface are responsible for the capacity fading. However, the latter is found to play a more important role after many cycles. 展开更多
关键词 soft x-ray absorption LiCoO2 charge compensation capacity degradation
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Electronic structure of correlated topological insulator candidate YbB6 studied by photoemission and quantum oscillation 认领 引用
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作者 T Zhang G Li +9 位作者 S C Sun N Qin L Kang S H Yao H M Weng S K Mo L Li Z K Liu L X Yang Y L Chen 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第1期70-75,共6页
Angle-resolved photoemission spectroscopy(ARPES)and torque magnetometry(TM)measurements have been carried out to study the electronic structures of a correlated topological insulator(TI)candidate Yb B6.We observed cle... Angle-resolved photoemission spectroscopy(ARPES)and torque magnetometry(TM)measurements have been carried out to study the electronic structures of a correlated topological insulator(TI)candidate Yb B6.We observed clear surface states on the[001]surface centered at theГ^- and М^- points of the surface Brillouin zone.Interestingly,the fermiology revealed by the quantum oscillation of TM measurements agrees excellently with ARPES measurements.Moreover,the band structures we observed suggest that the band inversion in Yb B6 happens between the Yb5 dand B2bands,instead of the Yb5dand Yb4fbands as suggested by previous theoretical investigation,which will help settle the heavy debate regarding the topological nature of samarium/ytterbium hexaborides. 展开更多
关键词 topological insulator electronic structure surface states
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Carbon decorated Li3V2(PO4)3 for high-rate lithium-ion batteries:Electrochemical performance and charge compensation mechanism 认领 引用 被引量：5
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作者 Manling Ding Chen Cheng +7 位作者 Qiulong Wei Yue Hu Yingying Yan Kehua Dai Jing Mao Jinghua Guo Liang Zhang Liqiang Maig 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2021年第2期124-131,I0005,共8页
Fast charging and high-power delivering batteries are highly demanded in mobile electronics,electric vehicles and grid energy storage,but there are full of challenges.The star-material Li3V2(PO4)3 is demon... Fast charging and high-power delivering batteries are highly demanded in mobile electronics,electric vehicles and grid energy storage,but there are full of challenges.The star-material Li3V2(PO4)3 is demonstrated as a promising high-rate cathode material meeting the above requirements.Herein,we report the carbon decorated Li3V2(PO4)3 (LVP/C) cathode prepared via a facile method,which displays a remarkable high-rate capability and long-term cycling performance.Briefly,the prepared LVP/C delivers a high discharge capacity of 122 mAh g-1(-93% of the theoretical capacity) at a high rate up to 20 C and a superior capacity retention of 87.1% after 1000 cycles.Importantly,by applying a combination of X-ray absorption spectroscopy and full-range mapping of resonant inelastic X-ray scattering,we clearly elucidate the structural and chemical evolutions of LVP upon various potentials and cycle numbers.We show unambiguous spectroscopic evidences that the evolution of the hybridization strength between V and O in LVP/C as a consequence of lithiation/delithiation is highly reversible both in the bulk and on the surface during the discharge-charge processes even over extended cycles,which should be responsible for the remarkable electrochemical performance of LVP/C.Our present study provides not only an effective synthesis strategy but also deeper insights into the surface and bulk electrochemical reaction mechanism of LVP,which should be beneficial for the further design of high-performance LVP electrode materials. 展开更多
关键词 Lithium-ion batteries Li3V2(PO4)3 Charge compensation mechanism X-ray absorption spectroscopy Resonant inelastic X-ray scattering
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Nanostructured Polyelectrolyte-surfactant Complex Pervaporation Membranes for Ethanol Recovery:the Relationship between the Membrane Structure and Separation Performance 认领 引用 被引量：3
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作者 Pei-Yao Zheng Ping Zhang +2 位作者 Zhi-Wei Sun Chen-Hui Zhu Quan-Fu An 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2018年第1期25-33,共9页
Polyelectrolyte-surfactant complexes（PESCs） were fabricated through the interaction of poly（acrylic acid） and four different cationic surfactants or their mixtures. PESC membranes were prepared by solution casting... Polyelectrolyte-surfactant complexes（PESCs） were fabricated through the interaction of poly（acrylic acid） and four different cationic surfactants or their mixtures. PESC membranes were prepared by solution casting method and were applied in ethanol recovery from aqueous solution via pervaporation. Elemental analysis（EA）, Fourier transform infrared spectroscopy（FTIR）, water contact angle（CA） measurement, differential scanning calorimetry（DSC） and X-ray scattering were employed to characterize the composition, structure and properties of PESCs. The results reveal that the investigated PESCs are similar in hydrophobicity but different in hierarchical nanostructures. In separating 5 wt% ethanol/water mixture, PESC membranes with high crystallinity will have both low flux and ethanol selectivity because of the high packing density and low permeability of crystalline regions. Meanwhile, the hierarchical nanostructures of PESC membranes change under pervaporation environment as was revealed by in situ synchrotron radiation X-ray scattering measurement. That is, the crystalline region could melt at high temperature in swelling state, thus consequently enhancing the ethanol selectivity. 展开更多
关键词 Polyelectrolyte-surfactant complex Pervaporation Ethanol recovery Crystallinity
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Achieving 20.1% Efficiency in Organic Solar Cells Through Interconnected Fibrillar Networks via Local Molecular Stacking 认领 引用
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作者 Junying Wu Wanqing You +9 位作者 Xuanang Luo Xiaojing Wang Zhiyuan Yang Junhao Zeng Jingchuan Chen Cheng Wang Lei Ying Wenkai Zhong Zhicai He Yong Cao 《Aggregate》 EI CAS CSCD 2026年第3期298-308,共11页
The performance of organic solar cells(OSCs)is governed by how molecular packing evolves into interconnected networks that facilitate exciton dissociation and charge transport.Using an all-small-molecule blend DR3TSBD... The performance of organic solar cells(OSCs)is governed by how molecular packing evolves into interconnected networks that facilitate exciton dissociation and charge transport.Using an all-small-molecule blend DR3TSBDT:Y6 as a model system,we study how local molecular stacking evolves into performance-relevant morphology during solvent vapor annealing(SVA)and subsequent thermal annealing(TA).SVA promotes end-to-end stacking of amorphous acceptors to form interconnected fibrils,while TA compacts inter-fibril spacing without disrupting favorable local order.Such molecular-to-morphological refinements broaden light absorption,enhance charge transport,and markedly improve device efficiency.Extending this approach to additional blend systems(D18:Y6,D18:L8-BO,and DR3TSBDT:L8-BO)yields similar structural evolution and performance gains,with the D18:L8-BO system achieving up to 20.10%PCE.Our study establishes control over local stacking in amorphous acceptors into fibrillar networks as a general and effective route to realize high-performance OSCs. 展开更多
关键词 amorphous molecular stacking morphology organic solar cells post-treatments
A Multicenter Metal–Organic Framework for Quantitative Detection of Multicomponent Organic Mixtures 认领 引用 被引量：10
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作者 Zongsu Han Kunyu Wang +5 位作者 Yinlin Chen Jiangnan Li Simon JTeat Sihai Yang Wei Shi Peng Cheng 《CCS Chemistry》 CSCD 2022年第10期3238-3245,共8页
Instant recognition and quantification of multicomponent organicmixtures,especially the oneswith similar characteristics,remains a key challenge in the chemical industry.Although luminescence sensing is considered a r... Instant recognition and quantification of multicomponent organicmixtures,especially the oneswith similar characteristics,remains a key challenge in the chemical industry.Although luminescence sensing is considered a rapid and facile method for the detection of various chemical substances,the simultaneous and quantitative detection of three or more components has not yet been achieved.Herein,we report a rationally designed white-light-emitting metal–organic framework(MOF)EuTb@NKU-102,and demonstrate its application in the simultaneous discrimination of multicomponent organic mixtures. 展开更多
关键词 multicenter emission multicomponent mixture isomer sensing material metal–organic framework
Random forest machine learning models for interpretable X-ray absorption near-edge structure spectrum-property relationships 认领 引用 被引量：15
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作者 Steven B.Torrisi Matthew R.Carbone +5 位作者 Brian A.Rohr Joseph H.Montoya Yang Ha Junko Yano Santosh K.Suram Linda Hung 《npj Computational Materials》 SCIE EI CSCD 2020年第1期743-753,共11页
X-ray absorption spectroscopy(XAS)produces a wealth of information about the local structure of materials,but interpretation of spectra often relies on easily accessible trends and prior assumptions about the structur... X-ray absorption spectroscopy(XAS)produces a wealth of information about the local structure of materials,but interpretation of spectra often relies on easily accessible trends and prior assumptions about the structure.Recently,researchers have demonstrated that machine learning models can automate this process to predict the coordinating environments of absorbing atoms from their XAS spectra.However,machine learning models are often difficult to interpret,making it challenging to determine when they are valid and whether they are consistent with physical theories.In this work,we present three main advances to the data-driven analysis of XAS spectra:we demonstrate the efficacy of random forests in solving two new property determination tasks(predicting Bader charge and mean nearest neighbor distance),we address how choices in data representation affect model interpretability and accuracy,and we show that multiscale featurization can elucidate the regions and trends in spectra that encode various local properties. 展开更多
关键词 property structure spectrum
Detecting lithium plating dynamics in a solid-state battery with operando X-ray computed tomography using machine learning 认领 引用 被引量：9
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作者 Ying Huang David Perlmutter +5 位作者 Andrea Fei-Huei Su Jerome Quenum Pavel Shevchenko Dilworth Y.Parkinson Iryna V.Zenyuk Daniela Ushizima 《npj Computational Materials》 SCIE EI CSCD 2023年第1期1402-1410,共9页
Operando X-ray micro-computed tomography(µCT)provides an opportunity to observe the evolution of Li structures inside pouch cells.Segmentation is an essential step to quantitatively analyzingµCT datasets but... Operando X-ray micro-computed tomography(µCT)provides an opportunity to observe the evolution of Li structures inside pouch cells.Segmentation is an essential step to quantitatively analyzingµCT datasets but is challenging to achieve on operando Li-metal battery datasets due to the low X-ray attenuation of the Li metal and the sheer size of the datasets.Herein,we report a computational approach,batteryNET,to train an Iterative Residual U-Net-based network to detect Li structures.The resulting semantic segmentation shows singular Li-related component changes,addressing diverse morphologies in the dataset.In addition,visualizations of the dead Li are provided,including calculations about the volume and effective thickness of electrodes,deposited Li,and redeposited Li.We also report discoveries about the spatial relationships between these components.The approach focuses on a method for analyzing battery performance,which brings insight that significantly benefits future Li-metal battery design and a semantic segmentation transferrable to other datasets. 展开更多
关键词 battery lithium state
Persistent surface states with diminishing gap in MnBi2Te4/Bi2Te3 superlattice antiferromagnetic topological insulator 认领 引用 被引量：6
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作者 Lixuan Xu Yuanhao Mao +23 位作者 Hongyuan Wang Jiaheng Li Yujie Chen Yunyouyou Xia Yiwei Li Ding Pei Jing Zhang Huijun Zheng Kui Huang Chaofan Zhang Shengtao Cui Aiji Liang Wei Xia Hao Su Sungwon Jung Cephise Cacho Meixiao Wang Gang Li Yong Xu Yanfeng Guo Lexian Yang Zhongkai Liu Yulin Chen Mianheng Jiang 《Science Bulletin》 SCIE EI CAS CSCD 2020年第24期2086-2093,M0005,共8页
Magnetic topological quantum materials(TQMs) provide a fertile ground for the emergence of fascinating topological magneto-electric effects. Recently, the discovery of intrinsic antiferromagnetic(AFM) topological insu... Magnetic topological quantum materials(TQMs) provide a fertile ground for the emergence of fascinating topological magneto-electric effects. Recently, the discovery of intrinsic antiferromagnetic(AFM) topological insulator MnBi2Te4 that could realize quantized anomalous Hall effect and axion insulator phase ignited intensive study on this family of TQM compounds. Here, we investigated the AFM compound Mn Bi4 Te7 where Bi2Te3 and MnBi2Te4 layers alternate to form a superlattice. Using spatial-and angleresolved photoemission spectroscopy, we identified ubiquitous(albeit termination dependent) topological electronic structures from both Bi2Te3 and MnBi2Te4 terminations. Unexpectedly, while the bulk bands show strong temperature dependence correlated with the AFM transition, the topological surface states with a diminishing gap show negligible temperature dependence across the AFM transition.Together with the results of its sister compound MnBi2Te4, we illustrate important aspects of electronic structures and the effect of magnetic ordering in this family of magnetic TQMs. 展开更多
关键词 Spatially resolved angle-resolved photoemission spectroscopy Electronic band structure Quantum anomalous Hall effect Magnetic topological insulator
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Synthesis of new two-dimensional titanium carbonitride Ti2C0.5N0.5TxMXene and its performance as an electrode material for sodium-ion battery 认领 引用 被引量：4
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作者 Kun Liang Anika Tabassum +6 位作者 Ahmad Majed Chaochao Dun Feipeng Yang Jinghua Guo Kaitlyn Prenger Jeffrey JUrban Michael Naguib 《InfoMat》 SCIE CSCD 2021年第12期1422-1430,共9页
Two-dimensional(2D)layered transition metal carbidesitrides,called MXenes,are attractive alternative electrode materials for electrochemical energy storage.Owing to their metallic electrical conductivity and low ion d... Two-dimensional(2D)layered transition metal carbidesitrides,called MXenes,are attractive alternative electrode materials for electrochemical energy storage.Owing to their metallic electrical conductivity and low ion dif-fusion barrier,MXenes are promising anode materials for sodium-ion batteries(SIBs).Herein,we report on a new 2D carbonitride MXene,viz.,Ti2C0.5N0.5Tx(Tx stands for surface terminations),and the only second carbonitride after Ti3 CNTx so far.A new type of in situ HF(HCl/KF)etching condition was employed to synthesize multilayer Ti2C0.5N0.5Tx powders from Ti2AlC0.5N0.5.Spontaneous intercalation of tetramethylammonium followed by sonication in water allowed for large-scale delamination of this new titanium carbonitride into 2D sheets.Multilayer Ti2C0.5N0.5Tx powders showed higher specific capac-ities and larger electroactive surface area than those of Ti2CTx powders.Multi-layer Ti2C0.5N0.5Tx powders show a specific capacity of 182 mAh g-1 at 20 mA g-1,the highest among all reported MXene electrodes as SIBs with excellent cycling stability. 展开更多
关键词 MXene sodium-ion battery titanium carbonitride two-dimensional
Autonomous scanning probe microscopy investigations over WS2and Au{111} 认领 引用 被引量：7
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作者 John C.Thomas Antonio Rossi +14 位作者 Darian Smalley Luca Francaviglia Zhuohang Yu Tianyi Zhang Shalini Kumari Joshua A.Robinson Mauricio Terrones Masahiro Ishigami Eli Rotenberg Edward S.Barnard Archana Raja Ed Wong D.Frank Ogletree Marcus M.Noack Alexander Weber-Bargioni 《npj Computational Materials》 SCIE EI CSCD 2022年第1期916-922,共7页
Individual atomic defects in 2D materials impact their macroscopic functionality.Correlating the interplay is challenging,however,intelligent hyperspectral scanning tunneling spectroscopy(STS)mapping provides a feasib... Individual atomic defects in 2D materials impact their macroscopic functionality.Correlating the interplay is challenging,however,intelligent hyperspectral scanning tunneling spectroscopy(STS)mapping provides a feasible solution to this technically difficult and time consuming problem.Here,dense spectroscopic volume is collected autonomously via Gaussian process regression,where convolutional neural networks are used in tandem for spectral identification.Acquired data enable defect segmentation,and a workflow is provided for machine-driven decision making during experimentation with capability for user customization.We provide a means towards autonomous experimentation for the benefit of both enhanced reproducibility and user-accessibility.Hyperspectral investigations on WS2sulfur vacancy sites are explored,which is combined with local density of states confirmation on the Au{111}herringbone reconstruction.Chalcogen vacancies,pristine WS2,Au face-centered cubic,and Au hexagonal close-packed regions are examined and detected by machine learning methods to demonstrate the potential of artificial intelligence for hyperspectral STS mapping. 展开更多
关键词 autonomous consuming packed
Coupled deep-mantle carbon-water cycle: Evidence from lower-mantle diamonds 认领 引用 被引量：5
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作者 Wenzhong Wang Oliver Tschauner +4 位作者 Shichun Huang Zhongqing Wu Yufei Meng Hans Bechtel Ho-Kwang Mao 《The Innovation》 EI 2021年第2期47-53,共7页
Diamonds form in a variety of environments between subducted crust,lithospheric and deep mantle.Recently,deep source diamonds with inclusions of the high-pressure H2O-phase ice-VII were discovered.By correlating the p... Diamonds form in a variety of environments between subducted crust,lithospheric and deep mantle.Recently,deep source diamonds with inclusions of the high-pressure H2O-phase ice-VII were discovered.By correlating the pressures of ice-VII inclusions with those of other high-pressure inclusions,we assess quantitatively the pressures and temperatures of their entrapment.We show that the iceVII-bearing diamonds formed at depths down to 800±60 km but at temperatures 200–500 K below average mantle temperature that match the pressure-temperature conditions of decomposing dense hydrous mantle silicates.Our work presents strong evidence for coupled recycling of water and carbon in the deep mantle based on natural samples. 展开更多
关键词 diamond deep mantle water and carbon cycle first-principles calculations
Visualization of the electronic phase separation in superconducting KxFe2−ySe2 认领 引用 被引量：3
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作者 Yujie Chen Juan Jiang +6 位作者 Haifeng Yang Pavel Dudin Alexey Barinov Zhongkai Liu Haihu Wen Lexian Yang Yulin Chen 《Nano Research》 SCIE EI CSCD 2021年第3期823-828,共6页
Type-II iron-based superconductors(Fe-SCs),the alkali-metal-intercalated iron selenide AxFe2−ySe2(A=K,Tl,Rb,etc.)with a superconducting transition temperature of 32 K,exhibit unique properties such as high N&... Type-II iron-based superconductors(Fe-SCs),the alkali-metal-intercalated iron selenide AxFe2−ySe2(A=K,Tl,Rb,etc.)with a superconducting transition temperature of 32 K,exhibit unique properties such as high Néel temperature,Fe-vacancies ordering,antiferromagnetically ordered insulating state in the phase diagram,and mesoscopic phase separation in the superconducting materials.In particular,the electronic and structural phase separation in these systems has attracted intensive attention since it provides a platform to unveil the insulating parent phase of type-II Fe-SCs that mimics the Mott parent phase in cuprates.In this work,we use spatial-and angle-resolved photoemission spectroscopy to study the electronic structure of superconducting KxFe2−ySe2.We observe clear electronic phase separation of KxFe2−ySe2 into metallic islands and insulating matrix,showing different K and Fe concentrations.While the metallic islands show strongly dispersive bands near the Fermi level,the insulating phase shows an energy gap up to 700 meV and a nearly flat band around 700 meV below the Fermi energy,consistent with previous experimental and theoretical results on the superconducting K1−xFe2Se2(122 phase)and Fe-vacancy ordered K0.8Fe1.6Se2(245 phase),respectively.Our results not only provide important insights into the mysterious composition of phase-separated superconducting and insulating phases of KxFe2−ySe2,but also present their intrinsic electronic structures,which will shed light on the comprehension of the unique physics in type-II Fe-SCs. 展开更多
关键词 spatial-and angle-resolved photoemission spectroscopy(µ-ARPES) iron-based superconductors phase separation electronic structure
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