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Possible structural origin of superconductivity in Sr-doped Bi2Se3

Physical Review materials 2018年第1期2卷 014201-014201页

作者： Zhuojun Li Meng Wang Dejiong Zhang Nan Feng Wenxiang Jiang Chaoqun Han Weijiong Chen Mao Ye Chunlei Gao Jinfeng Jia Jixue Li Shan Qiao Dong Qian Ben Xu He Tian Bo Gao CAS Center for Excellence in Superconducting Electronics (CENSE) Shanghai 200050 China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences 865 Changning Road Shanghai 200050 China University of Chinese Academy of Sciences Beijing 100049 China Center of Electron Microscopy and State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Hangzhou 310027 China State Key Laboratory of New Ceramics and Fine Processing Department of Materials Science and Engineering Tsinghua University Beijing 100084 People's Republic of China Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education) School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China State Key Laboratory of Surface Physics and Department of Physics Fudan University Shanghai 200433 China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093 China

Doping bismuth selenide (Bi2Se3) with elements such as copper and strontium (Sr) can induce superconductivity, making the doped materials interesting candidates to explore potential topological superconducting behaviors. It was thought that the superconductivity of doped Bi2Se3 was induced by dopant atoms intercalated in van der Waals gaps. However, several experiments have shown that the intercalation of dopant atoms may not necessarily make doped Bi2Se3 superconducting. Thus, the structural origin of superconductivity in doped Bi2Se3 remains an open question. Herein, we combined material synthesis and characterization, high-resolution transmission electron microscopy, and first-principles calculations to study the doping structure of Sr-doped Bi2Se3. We found that the emergence of superconductivity is strongly related with n-type dopant atoms. Atomic-level energy-dispersive x-ray mapping revealed various n-type Sr dopants that occupy intercalated and interstitial positions. First-principles calculations showed that the formation energy of a specific interstitial Sr doping position depends strongly on the Sr doping level. This site changes from a metastable position at low Sr doping level to a stable position at high Sr doping level. The calculation results explain why quenching is necessary to obtain superconducting samples when the Sr doping level is low and also why slow furnace cooling can yield superconducting samples when the Sr doping level is high. Our findings suggest that Sr atoms doped at interstitial locations, instead of those intercalated in van der Waals gaps, are most likely to be responsible for the emergence of superconductivity in Sr-doped Bi2Se3.

关键词： Dopants Impurities in superconductors

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Uranium Extraction: Significantly Enhanced Uranium Extraction from Seawater with Mass Produced Fully Amidoximated Nanofiber Adsorbent (Adv. Energy Mater. 33/2018)

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advanced Energy materials 2018年第33期8卷

作者： Dong Wang Jianan Song Jun Wen Yihui Yuan Zhenglian Liu Sen Lin Haiyang Wang Haolun Wang Shilei Zhao Xuemei Zhao Minghao Fang Ming Lei Bo Li Ning Wang Xiaolin Wang Hui Wu State Key Laboratory of Marine Resource Utilization in South China Sea Hainan University Haikou 570228 China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing 100084 China Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics Mianyang 621900 China School of Materials Science and Technology China University of Geosciences Beijing 100083 China State Key Laboratory of Information Photonics and Optical Communications School of Science Beijing University of Posts and Telecommunications Beijing 100876 China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu 610054 China

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Pressure-temperature phase diagram of vanadium dioxide

arXiv

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arXiv 2017年

作者： Chen, Yabin Zhang, Shuai Ke, Feng Ko, Changhyun Lee, Sangwook Liu, Kai Chen, Bin Ager, Joel W. Jeanloz, Raymond Eyert, Volker Wu, Junqiao Department of Materials Science and Engineering University of California BerkeleyCA94720 United States Department of Earth and Planetary Science University of California BerkeleyCA94720 United States Center for High Pressure Science and Technology Advanced Research Shanghai201203 China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing100084 China Materials Sciences Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Materials Design SARL Montrouge92120 France

The complexity of strongly correlated electron physics in vanadium dioxide is exemplified as its rich phase diagrams of all kinds, which in turn shed light on the mechanisms behind its various phase transitions. In this work, we map out the hydrostatic pressure - temperature phase diagram of vanadium dioxide nanobeams by independently varying pressure and temperature with a diamond anvil cell. In addition to the well-known insulating M1 (monoclinic) and metallic R (tetragonal) phases, the diagram identifies the existence at high pressures of the insulating M1' (monoclinic, more conductive than M1) phase, and two metallic phases of X (monoclinic) and O (orthorhombic, at high temperature only). Systematic optical and electrical measurements combined with density functional calculations allow us to delineate their phase boundaries as well as reveal some basic features of the transitions. Copyright © 2017, The Authors. All rights reserved.

关键词： Hydrostatic pressure

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Biodegradable Batteries: A Fully Biodegradable Battery for Self-Powered Transient Implants (Small 28/2018)

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Small 2018年第28期14卷

作者： Xueying Huang Dan Wang Zhangyi Yuan Wensheng Xie Yixin Wu Rongfeng Li Yu Zhao Deng Luo Liang Cen Binbin Chen Hui Wu Hangxun Xu Xing Sheng Milin Zhang Lingyun Zhao Lan Yin School of Materials Science and Engineering The Key Laboratory of Advanced Materials of Ministry of Education State Key Laboratory of New Ceramics and Fine Processing Tsinghua University Beijing 100084 P. R. China Department of Electronic Engineering Tsinghua University Beijing 100084 P. R. China Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA Hefei National Laboratory for Physical Sciences at the Microscale Department of Polymer Science and Engineering University of Science and Technology of China Hefei Anhui 230026 P. R. China

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Electrical properties of Y0.06Sr0.94Ti0.6Fe0.4O3-δ -YSZ composites as electrode materials 9th

Electrical properties of Y0.06Sr0.94Ti0.6Fe0.4O3-δ -YSZ com...

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9th China International Conference on High-Performance Ceramics, CICC 2015

作者： Shan, Ke Guo, Xing-Min Zhai, Fengrui Yi, Zhong-Zhou Laboratory of New Materials for Power Sources College of Science Honghe University Yunnan Province661199 China State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing Beijing100083 China

ISBN: (纸本)9783035710656

Y0.06Sr0.94Ti0.6Fe0.4O3-δ-YSZ composites were prepared by mixing Y, Fe co-doped SrTiO3 (Y0.06Sr0.94Ti0.6Fe0.4O3-δ, YSTF) and 8 mol% Y2O3 stabilized ZrO2 (YSZ) in different weight fractions. The phase stability, phase compatibility, microstructure and mixed ionic-electronic conductivity of the composites were investigated. XRD analysis showed no detectable secondary phases. The electrical conductivity measurement showed a drastic decrease in total conductivities when more than 10 wt% of YSZ was used in the composites. The total electrical conductivity was 0.102 S/cm for Y0.06Sr0.94Ti0.6Fe0.4O3-δ and 0.043 S/cm for YSTF-20YSZ at 700°C, respectively. The value at 700°C is approximately 2.4 times higher than that of YSTF-20YSZ. The ionic conductivity of Y0.06Sr0.94Ti0.8Fe0.2O3-δ varies from 0.015S/cm at 700°C to 0.02 S/cm at 800°C, respectively. The value at 800°C is approximately 12.5 times higher than YSTF-20YSZ. The ion transference numbers of YSTF-YSZ composites vary from 0.14 to 0.28 at 800°C. © 2016 Trans Tech Publications, Switzerland.

关键词： Strontium titanates

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Drug-nanoencapsulated PLGA microspheres prepared by emulsion electrospray with controlled release behavior

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Regenerative Biomaterials 2016年第5期3卷 309-317页

作者： Shenglian Yao Huiying Liu Shukui Yu Yuanyuan Li Xiumei Wang Luning Wang School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Department of Oral and Maxillofacial Surgery School of StomatologyDalian Medical UniversityDalian 116044China Institute for Neuroscience Capital Medical UniversityBeijing 100069China

The development of modern therapeutics has raised the requirement for controlled drug delivery system which is able to efficiently encapsulate bioactive agents and achieve their release at a desired rate satisfying the need of the practical *** this study,two kind of aqueous model drugs with different molecule weight,Congo red and albumin from bovine serum(BSA)were nanoencapsulated in poly(DL-lactic-co-glycolic acid)(PLGA)microspheres by emulsion *** the preparation process,the aqueous phase of drugs was added into the PLGA chloroform solution to form the emulsion *** emulsion was then electrosprayed to fabricate drugnanoencapsulated PLGA *** morphology of the PLGA microspheres was affected by the volume ratio of aqueous drug phase and organic PLGA phase(V_(w)/V_(o))and the molecule weight of model *** laser scanning microcopy showed the nanodroplets of drug phase were scattered in the PLGA microspheres homogenously with different distribution patterns related to V_(w)/V_(o).With the increase of the volume ratio of aqueous drug phase,the number of nanodroplets increased forming continuous phase gradually that could accelerate drug release ***,BSA showed a slower release rate from PLGA microspheres comparing to Congo red,which indicated the drug release rate could be affected by not only V_(w)/V_(o)but also the molecule weight of model *** brief,the PLGA microspheres prepared using emulsion electrospray provided an efficient and simple systemto achieve controlled drug release at a desired rate satisfying the need of the practices.

关键词： PLGA microspheres drug nanoencapsulation emulsion electrospray controlled drug release

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Regulating the active species of Ni(OH)2 using CeO2: 3D CeO2/Ni(OH)2/carbon foam as an efficient electrode for the oxygen evolution reaction

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Chemical science 2017年第4期8卷 3211-3217页

作者： Zhengqing Liu Na Li Hongyang Zhao Yi Zhang Yunhui Huang Zongyou Yin Yaping Du Frontier Institute of Science and Technology Jointly with College of Science State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University 99 Yanxiang Road Yanta District Xi'an Shaanxi Province 710054 China . Email: ypdu2013@***. Collaborative Innovation Center of Intelligent New Energy Vehicle School of Materials Science and Engineering Tongji University Shanghai 201804 P. R. China. State Key Laboratory of Material Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan Hubei 430074 P. R. China. Research School of Chemistry The Australian National University Canberra Australian Capital Territory 2601 Australia. Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA.

Three dimensional (3D) N, O and S doped carbon foam (NOSCF) is prepared as a substrate for vertically grown Ni(OH) nanosheets. As designed Ni(OH)/NOSCF possesses strong electrostatic interactions with OH ions due to many C[double bond, length as m-dash]O groups existing in NOSCF, which can facilitate the formation of crucial NiOOH intermediates during the OER process. CeO nanoparticles (NPs) of ∼3.3 nm in size are decorated on Ni(OH) nanosheets to design a highly efficient CeO/Ni(OH)/NOSCF electrocatalyst for the oxygen evolution reaction (OER). The CeO NP decorated Ni(OH)/NOSCF not only exhibits a remarkably improved OER performance with an onset potential of 240 mV, outperforming most reported non-noble metal based OER electrocatalysts, but also possesses a small Tafel slope of 57 mV dec and excellent stability under different overpotentials. The synergistic effect of producing more active species of Ni and accelerating the charge transfer for Ni(OH)/NOSCF by the introduction of CeO NPs is also investigated. These results demonstrate the possibility of designing energy efficient OER catalysts with the assistance of earth abundant CeO-based catalysts.

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Graphene Foams: A Bubble‐Derived Strategy to Prepare Multiple Graphene‐Based Porous materials (Adv. Funct. Mater. 23/2018)

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advanced Functional materials 2018年第23期28卷

作者： Rujing Zhang Ruirui Hu Xinming Li Zhen Zhen Zhenhua Xu Na Li Limin He Hongwei Zhu Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material Department 5 P.O. Box 81‐5 AECC Beijing Institute of Aeronautical Materials Beijing 100095 China State Key Lab of New Ceramics and Fine Processing School of Materials Science and Engineering and Center for Nano and Micro Mechanics Tsinghua University Beijing 100084 China International Center for Materials Nanoarchitectonics (WPI‐MANA) National Institute for Materials Science (NIMS) 1‐1 Namiki Tsukuba Ibaraki 305‐0044 Japan

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The electrical properties of epitaxial grown Sc-Doped (Na0.85K0.15)0.5Bi0.5TiO3 Thin film prepared by sol-gel method 9th

The electrical properties of epitaxial grown Sc-Doped (Na0.8...

引用

9th China International Conference on High-Performance Ceramics, CICC 2015

作者： Wu, Yunyi Wang, Xiaohui Zhong, Caifu Li, Longtu Department of Energy Materials and Technology Beijing General Research Institute for Nonferrous Metals Beijing100088 China State Key Laboratory of New Ceramics and Fine Processing Department of Materials Science and Engineering Tsinghua University Beijing100084 China

ISBN: (纸本)9783035710656

Sc-doped (Na0.85K0.15)0.5Bi0.5TiO3 (NKBT-Sc) thin film was deposited on electrical conductive Nb-doped SrTiO3 [100] (Nb: STO) single crystal substrate via an aqueous sol-gel method. Structure analysis by XRD and HRTEM proves the epitaxial growth relationship between the NKBT-Sc thin film and Nb: STO substrate. Well saturated ferroelectric hysteresis loops with remnant polarization of 26.14 μC/cm2 typical butterfly shape displacement-voltage loop with effective piezoelectric coefficient d33∗ of 92 pm/V were observed, which were much higher than the NKBT-Sc thin film deposited on platinized silicon substrate. The precision LCR Meter exhibits a butterfly shape of dielectric constant and electric field curve, which is typical nature for the ferroelectric characteristics of the [001]-epitaxial NKBT-Sc thin film. © 2016 Trans Tech Publications, Switzerland.

关键词： Thin films

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One-step synthesis of hierarchically porous hybrid TiO2 hollow spheres with high photocatalytic activity

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Frontiers of materials Science 2016年第1期10卷 15-22页

作者： Ruiping LIU Feng REN Jinlin YANG Weiming SU Zhiming SUN Lei ZHANG Chang-an WANG Department of Materials Science and Engineering China University of Mining & Technology (Beijing) Beijing 100083 China School of Chemical & Environmental Engineering China University of Mining & Technology (Beijing) Beijing 100083 China Department of Mechanical Engineering PO Box 755905 University of Alaska Fairbanks Fairbanks AK 99775 USA School of Materials Science and Engineering State Key Laboratory of New Ceramics and Fine Processing Tsinghua University Beijing 100084 China

Hierarchically porous hybrid TiO2 hollow spheres were solvothermally synthesized successfully by using tetrabutyl titanate as titanium precursor and hydrated metal sulfates as soft templates. The as-prepared TiO2 spheres with hierarchically pore structures and high specific surface area and pore volume consisted of highly crystallized anatase TiO2 nanocrystals hybridized with a small amount of metal oxide from the hydrated sulfate. The proposed hydrated-sulfate assisted solvothermal （HAS） synthesis strategy was demonstrated to be widely applicable to various systems. Evaluation of the hybrid TiO2 hollow spheres for the photo-decomposition of methyl orange （MO） under visible-light irradiation revealed that they exhibited excellent photocatalytic activity and durability.

关键词： titania hybrid composite hollow spheres photocatalytic property

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