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Experimental Investigation of the Electronic Structure of Ca_(0.83)La_(0.17)Fe_(2)As_(2)

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Chinese physics Letters 2013年第1期30卷 180-183页

作者： HUANG Yao-Bo RICHARD Pierre WANG Ji-Hui WANG Xiao-Ping SHI Xun XU Nan wu Zheng LI Ang YIN Jia-Xin QIAN Tian LV Bing chu ching-wu PAN Shu-Heng SHI Ming DING Hong Beijing National Laboratory for Condensed Matter physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190 texas center for superconductivity and department of physics University of HoustonTX 77204-5002USA Paul Scherrer Institut Swiss Light SourceCH-5232 Villigen PSISwitzerland

We performed a combined angle-resolved photoemission spectroscopy and scanning tunneling microscopy study of the electronic structure of electron-doped Ca_(0.83)La_(0.17)Fe_(2)As_(2).A surface reconstruction associated with the dimerization of As atoms is observed directly in the real space,as well as the consequent band folding in the momentum *** this band folding effect,the Fermi surface topology of this material is similar to that reported previously for BaFe_(1.85)Co_(0.15)As_(2),with Γ-centered hole pockets quasi-nested to M-centered electron pockets by the antiferromagnetic wave *** no superconducting gap is observed by ARPES possibly due to low superconducting volume fraction,a gap-like density of states depression of 7.7±2.9 meV is determined by scanning tunneling microscopy.

关键词： vector. space

Flexible atomic buckling and homogeneous edge states in few-layer Bi(110)films

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Nano Research 2022年第3期15卷 2374-2381页

作者： Yanfeng Lyu Samira Daneshmandi Shuyuan Huyan chingwu chu department of physics and texas center for superconductivity University of HoustonHoustonTexas 77204USA Lawrence Berkeley National Laboratory BerkeleyCalifornia 94720USA

The structure and edge states of two-dimensional few-layer Bi(110)films grown on a graphene/SiC substrate were studied by low-temperature scanning tunneling microscopy and *** found that the local density of states of few-layer Bi(110)films are layer-dependent and that the films transition from exhibiting semiconducting characteristics to metallic ones as the number of layers *** in-plane lattice structure has numerous displacements and inversions,which implies that the atomic arrangement and atomic buckling in ultrathin Bi(110)films are *** edges formed between 4-monolayer Bi(110)and graphene are reconstructed and distorted,and the corresponding edge states are topographically *** from the substrate and domain boundaries also modify the electronic structures and induce additional defect-dependent *** also found that the zigzag-shaped step edges in few-layer Bi(110)films are nonreconstructed and possess layer-dependent homogeneous edge states,providing a very likely platform for further research on quantum interference of the edge mode in order to confirm the topology in Bi(110).

关键词： few-layer Bi(110)films lattice displacement and inversion distortion zigzag edge edge states

Recent Advances in Self-Supported Layered Double Hydroxides for Oxygen Evolution Reaction

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Research 2020年第1期2020卷 635-651页

作者： Libo wu Luo Yu Xin Xiao Fanghao Zhang Shaowei Song Shuo Chen Zhifeng Ren department of physics and texas center for superconductivity(TcSUH) University of HoustonHoustonTX 77204USA Materials Science and Engineering Program University of HoustonHoustonTX 77204USA College of Physical Science and Technology Central China Normal UniversityWuhan 430079China wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China department of Chemistry University of HoustonHoustonTexas 77204USA

Electrochemical water splitting driven by clean and sustainable energy sources to produce hydrogen is an efficient and environmentally friendly energy conversion *** splitting involves hydrogen evolution reaction(HER)and oxygen evolution reaction(OER),in which OER is the limiting factor and has attracted extensive research interest in the past few *** noble-metal-based OER electrocatalysts like IrO_(2) and RuO_(2) suffer from the limitations of high cost and scarce *** innovative alternative nonnoble metal electrocatalysts with high catalytic activity and long-term durability to boost the OER process remains a significant *** all of the candidates for OER catalysis,selfsupported layered double hydroxides(LDHs)have emerged as one of the most promising types of electrocatalysts due to their unique layered structures and high electrocatalytic *** this review,we summarize the recent progress on self-supported LDHs and highlight their electrochemical catalytic ***,synthesis methods,structural and compositional parameters,and influential factors for optimizing OER performance are discussed in ***,the remaining challenges facing the development of self-supported LDHs are discussed and perspectives on their potential for use in industrial hydrogen production through water splitting are provided to suggest future research directions.

关键词： splitting layered Oxygen

Hierarchical Interconnected NiMoN with Large Specific Surface Area and High Mechanical Strength for Efficient and Stable Alkaline Water/Seawater Hydrogen Evolution

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Nano-Micro Letters 2023年第9期15卷 520-535页

作者： Minghui Ning Yu Wang Libo wu Lun Yang Zhaoyang Chen Shaowei Song Yan Yao Jiming Bao Shuo Chen Zhifeng Ren department of physics and texas center for superconductivity at the university of houston(TcSUH) University of HoustonHoustonTX 77204USA Cullen College of Engineering and TcSUH University of HoustonHoustonTX 77204USA School of Materials Science and Engineering Hubei Normal UniversityHuangshi 435002HubeiPeople’s Republic of China department of Electrical and Computer Engineering and TcSUH University of HoustonHoustonTX 77204USA

NiMo-based nanostructures are among the most active hydrogen evolution reaction(HER)catalysts under an alkaline environment due to their strong water dissociation ***,these nanostructures are vulnerable to the destructive effects of H_(2) production,especially at industry-standard current ***,developing a strategy to improve their mechanical strength while maintaining or even further increasing the activity of these nanocatalysts is of great interest to both the research and industrial ***,a hierarchical interconnected NiMoN(HW-NiMoN-2h)with a nanorod-nanowire morphology was synthesized based on a rational combination of hydrothermal and water bath ***-NiMoN-2h is found to exhibit excellent HER activity due to the accomodation of abundant active sites on its hierarchical morphology,in which nanowires con-nect free-standing nanorods,concurrently strengthening its structural stability to withstand H_(2) production at 1 A cm^(−2).Seawater is an attractive feedstock for water electrolysis since H_(2) generation and water desalination can be addressed simultaneously in a single *** HER performance of HW-NiMoN-2h in alkaline seawater suggests that the presence of Na+ions interferes with the reation kinetics,thus lowering its activity ***,benefiting from its hierarchical and interconnected characteristics,HW-NiMoN-2h is found to deliver outstanding HER activity of 1 A cm^(−2) at 130 mV overpotential and to exhibit excellent stability at 1 A cm^(−2) over 70 h in 1 M KOH seawater.

关键词： Hydrogen evolution reaction(HER) Nanoarchitecture NiMo catalysts Direct seawater electrolysis Nanostructural stability

A Study of Surface Modification of Poly(lactic-co-glycolic) Acid Using Argon Ion Irradiation

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Journal of Surface Engineered Materials and Advanced Technology 2014年第6期4卷 326-331页

作者： Ananta Raj Adhikari Buddhi Prasanga Tilakaratne Dharshana Wijesundera Wei-Kan chu texas center for superconductivity University of Houston Houston USA department of physics University of Houston Houston USA

The effect of Argon ion irradiation to the surface properties of poly(lactic-co-glycolic) acid (PLGA) was studied. A beam of 170 keV Argon ions was implanted at different fluencies (1 × 1012, 1 × 1013, 1 × 1014, and 1 × 1015 ions/cm2). X-ray photoelectron spectroscopy (XPS) was used to analyze the evolution of the bonding microstructure of PLGA due to irradiation. Surface morphology was monitored using atomic force microscopy (AFM). AFM analysis shows that film roughness increased to maximum at the dose of 1 × 1014 ions/cm2 where the formations of hillocks were also detected. Hydrophilicity of PLGA is important for their applications in biomedicine such as bioscaffolds. Hydrophilicity was monitored using water contact angle measurements for both unmodified and ion-modified PLGA. It was observed that hydrophilicity of PLGA changes with the ion irradiation. This demonstrates that ion irradiation can be an alternative approach to control hydrophilicity of PLGA. PLGA scaffolds modified with ion irradiation could therefore be more suitable for the biomedical applications.

关键词： Poly(lactic-co-glycolic) Acid Scaffold Surface Modification Ion Irradiation

Search for electron-antineutrinos associated with gravitational-wave events GW150914,GW151012,GW151226,GW170104,GW170608,GW170814,and GW170817 at Daya Bay

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Chinese physics C 2021年第5期45卷 190-201页

作者： F.P.An A.B.Balantekin H.R.Band M.Bishai S.Blyth G.F.Cao J.Cao J.F.Chang Y.Chang H.S.Chen S.M.Chen Y.Chen Y.X.Chen J.Cheng Z.K.Cheng J.J.Cherwinka M.C.chu J.P.Cummings O.Dalager F.S.Deng Y.Y.Ding M.V.Diwan T.Dohnal J.Dove M.Dvorak D.A.Dwyer J.P.Gallo M.Gonchar G.H.Gong H.Gong W.Q.Gu J.Y.Guo L.Guo X.H.Guo Y.H.Guo Z.Guo R.W.Hackenburg S.Hans M.He K.M.Heeger Y.K.Heng A.Higuera Y.K.Hor Y.B.Hsiung B.Z.Hu J.R.Hu T.Hu Z.J.Hu H.X.Huang X.T.Huang Y.B.Huang P.Huber D.E.Jaffe K.L.Jen X.L.Ji X.P.Ji R.A.Johnson D.Jones L.Kang S.H.Kettell S.Kohn M.Kramer T.J.Langford J.Lee J.H.C.Lee R.T.Lei R.Leitner J.K.C.Leung F.Li J.J.Li Q.J.Li S.Li S.C.Li W.D.Li X.N.Li X.Q.Li Y.F.Li Z.B.Li H.Liang C.J.Lin G.L.Lin S.Lin J.J.Ling J.M.Link L.Littenberg B.R.Littlejohn J.C.Liu J.L.Liu C.Lu H.Q.Lu J.S.Lu K.B.Luk X.B.Ma X.Y.Ma Y.Q.Ma C.Marshall D.A.Martinez Caicedo K.T.MeDonald R.D.McKeown Y.Meng J.Napolitano D.Naumov E.Naumova J.P.Ochoa-Ricoux A.OIshevskiy H.-R.Pan J.Park S.Patton J.C.Peng C.S.J.Pun F.Z.Qi M.Qi X.Qian N.Raper J.Ren C.Morales Reveco R.Rosero B.Roskovec X.C.Ruan H.Steiner J.L.Sun T.Tmej K.Treskov W.-H.Tse C.E.Tull B.Viren V.Vorobel C.H.Wang J.Wang M.Wang N.Y.Wang R.G.Wang W.Wang W.Wang X.Wang Y.Wang Y.F.Wang Z.Wang Z.Wang Z.M.Wang H.Y.Wei L.H.Wei L.J.Wen K.Whisnant C.G.White H.L.H.Wong E.Worcester D.R.wu F.L.wu Q.wu W.J.wu D.M.Xia Z.Q.Xie Z.Z.Xing J.L.Xu T.Xu T.Xue C.G.Yang L.Yang Y.Z.Yang H.F.Yao M.Ye M.Yeh B.L.Young H.Z.Yu Z.Y.Yu B.B.Yue S.Zeng Y.Zeng L.Zhan C.Zhang F.Y.Zhang H.H.Zhang J.W.Zhang Q.M.Zhang X.T.Zhang Y.M.Zhang Y.X.Zhang Y.Y.Zhang Z.J.Zhang Z.P.Zhang Z.Y.Zhang J.Zhao L.Zhou H.L.Zhuang J.H.Zou Instiute of Modern physics East China University of Science and TechnologyShanghai 200237 university of Wisconsin MadisonWisconsin 53706 Wright Laboratory and department of physics Yale UniversityNew HavenConnecticut 06520 Brookhaven National Laboratory UptonNew York 11973 department of physics National Taiwan UniversityTaipei Institute of High Energy physics Beijing 100049 National United university Miao-Li department of Engineering physics Tsinghua UniversityBejing 100084 Shenzhen university Shenzhen 518060 Sun Yat-Sen(Zhongshan)university Guangzhou North China Electric Power university Bejjing 102206 Chinese university of Hong Kong Hong Kong 999077 Siena College LoudonvilleNew York 12211 department of physics and Astronomy University of CaliforniaIrvineCaliformia 92697 university of Science and Technology of China Hefei 230026 Charles university Faculty of Mathematics and PhysicsPrague department of physics University of llinois at Urbana-ChampaignUrbanaIlinois 61801 Lawrence Berkeley National Laboratory BerkeleyCalifornia 94720 department of physics Illinois Institute of TechnologyChicagoIllinois 60616 Joint Institute for Nuclear Research DubnaMoscow Region Beijing Normal university Beijing 100875 department of Nuclear Science and Technology School of Energy and Power EngineeringXi'an Jiaotong UniversityXi'an 710049 department of physics University of HoustonHoustonTexas 77204 China Institute of Atomic Energy Beijing 102413 Shandong university Jinan 250100 Guangxi university Nanning 530004 center for Neutrino physics Virginia TechBlacksburgVirginia 24061 Institute of physics National Chiao-Tung UniversityHsinchu department of physics University of CincinnatiCincinnatiOhio 45221 department of Physies Collge of Science and TechnologyTemple UniversityPhiladelphiaPennsylvania 19122 Dongguan university of Technology Dongguan 523808 department of physics University of CaliforniaBerkeleyCalifornia 94720 department of physics The University of Hong KongPokfulamHong Kong 999077 School

The establishment of a possible connection between neutrino emission and gravitational-wave(GW)bursts is important to our understanding of the physical processes that occur when black holes or neutron stars *** the Daya Bay experiment,using the data collected from December 2011 to August 2017,a search was per-formed for electron-antineutrino signals that coincided with detected GW events,including GW150914,GW151012,GW151226,GW170104,GW170608,GW 170814,and GW *** used three time windows of±10,±500,and±1000 s relative to the occurrence of the GW events and a neutrino energy range of 1.8 to 100 MeV to search for correlated neutrino *** detected electron-antineutrino candidates were consistent with the expected background rates for all the three time *** monochromatic spectra,we found upper limits(90%confidence level)of the electron-antineutrino fluence of(1.13-2.44)×10^(11)cm^(-2)at 5 MeV to 8.0×10^(7)cm^(-2)at 100 MeV for the three time w *** the assumption of a Fermi-Dirac spectrum,the upper limits were found to be(5.4-7.0)×10^(9)cm^(2)for the three time windows.

关键词： grav itational waves electron-antineutrinos fluence upper limit