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PT-symmetry-protected Dirac states in strain-induced hidden MoS2 monolayer

Physical Review B 2019年第23期100卷 235435-235435页

作者： Meiling Xu Guohui Zhan Siyu Liu Dongqin Zhang Xin Zhong Ziyang Qu Yinwei Li Aijun Du Haijun Zhang Yanchao Wang Laboratory of Quantum Materials Design and Application School of Physics and Electronic Engineering Jiangsu Normal University Xuzhou 221116 China State Key Laboratory of Superhard Materials & Innovation Center for Computational Physics Methods and Software College of Physics Jilin University Changchun 130012 China National Laboratory of Solid State Microstructures School of Physics Nanjing University Nanjing 210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China Department of Physics China Jiliang University Hangzhou Zhejiang 310018 People's Republic of China Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education Jilin Normal University Changchun 130103 China School of Chemistry Physics and Mechanical Engineering Queensland University of Technology Gardens Point Campus Brisbane QLD 4001 Australia

Two-dimensional (2D) materials have recently attracted significant interest in condensed-matter physics and materials science due to rich intriguing physics and potential applications. Here, by first-principles calculations, we discover a phase of transition-metal dichalcogenides (MoS2 and its family) named the 1H′ phase. We demonstrate that 1H′MoS2 monolayer has multiple topological phase transitions from a topologically trivial insulator state to a 2D type-II Dirac semimetal state, and then to a 2D ideal type-I semimetal state under a moderate tensile strain. The Dirac points are protected by the coexistence of space-inversion (P) and time-reversal (T) symmetry. Our results highlight a family of nonhoneycomb 2D Dirac semimetals with potential application in nanoelectronics.

关键词： Edge states First-principles calculations Topological materials

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Preparation and Characterization of Singlehanded Helical Carbonaceous Nanofibers using 1,4-Phenylene Bridged Polybissilsesquioxanes

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Journal of Wuhan University of Technology(Materials Science) 2016年第5期31卷 1149-1154页

作者：肖泽丽 GUO Yongmin 李宝宗 LI Yi Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application Department of Polymer Science and Engineering College of Chemistry Chemical Engineering and Materials Science Sooehow University Suzhou 215123 China

Single-handed helical carbonaceous materials attracted much attention for varieties of potential applications. Herein, single-handed helical 1, 4-phenylene bridged polybissilsesquioxane nanofibers were prepared through a supramolecular templating approach using a pair of enantiomers. After carbonization at 700 ℃ for 2.0 h and removal of silica using HF aqueous solution, single-handed helical carbonaceous nanofibers were obtained. The obtained samples were characterized using the field-emission scanning electron microscopy, transmission electron microscopy, N_2 sorptions, X-ray diffraction, Raman spectroscopy and diffuse reflectance circular dichroism（DRCD）. The Raman spectrum indicated that the carbon was amorphous. The DRCD spectra indicated that the carbonaceous nanofibers exhibited optical activity. The surface area of the left-handed helical carbonaceous nanofibers was 907 m^2/g. Such material has potential applications as chirality sensor and supercapacitor electrode.

关键词： helicity carbon optical activity nanofibers

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Conformational Chirality of the Biphenyl Groups Induced by the Aggregation of Poly {bis[4-(4＇-(S)-2-methylbutoxy)- Biphenoxy] Phosphazene}

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Journal of Wuhan University of Technology(Materials Science) 2016年第5期31卷 1162-1166页

作者：唐贤慧 LI Baozong 李艺 YANG Yonggang Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application Department of Polymer Science and Engineering College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 China

Poly{bis[4-（4＇-（S）-2-methylbutoxy）biphenyloxy]phosphazene}（PP-C） was designed and successfully synthesized, and then characterized by means of FT-IR spectroscopy, ~1H- and ^（31）P-NMR, GPC spectroscopy, wide angle X-ray diffraction and differential scanning calorimetry. The results indicated that for PP-C, the M_w is 2.18×10~5 and the PDI is 1.96. PP-C was a kind of crystallized polymer with a crystallizing point of -2.0 ℃ and a melting point of 28 ℃. The conformational chirality of the PP-C molecules was studied using circular dichroism spectrum. It was found that in dilute THF solution, the biphenyl groups in the PP-C molecules twisted randomly. However, when the PP-C formed aggregates, the biphenyl groups tended to twist single-handedly, which was controlled by the adjacent chiral alkoxy groups.

关键词： polyphosphazene biphenyl chirality aggregates

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Novel Molecular Composites Based on Poly(esterimide)s

Novel Molecular Composites Based on Poly(esterimide)s

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第二十一届国际复合材料大会

作者： Qingbao Guan Li Yuan Aijuan Gu Guozheng Liang Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application Department of Materials Science and EngineeringCollege of Chemistry Chemical Engineering and Materials ScienceSoochow University

We are currently exploring all-aromatic copoly（ester-imide）s based on N-（3'-hydroxyphenyl）trimellitimide（IM） and 4-hydroxybenzoic acid（HBA）.Two different crystal phase polymers with molar ratio of IM/HBA as 0.3/0.7（semi-crystalline） and 0.7/0.3（amorphous） were obtained from a one-step melt polymerization method, namely 3-IM/7-HBA and 7-IM/3-HBA, *** both cases, thermoplastic polymers were obtained with a high volume fraction of infusible crystalline poly（HBA） or amorphous poly（IM）.Composite films prepared by melt pressing are brittle but upon stretching（stretch ratios of 4 are possible） above their glass transition temperature（T） their ductility improves *** to different reinforcement mechanisms, the two molecular composites exhibit different thermo-mechanical properties.3-IM/7-HBA composite films show a strong dependence of the T on the stretch *** as prepared films exhibit a T of 205 ℃ and the T increased to 248 ℃ after stretching the films 3 times above *** tensile strength and elongation at break of the film increased by 0%（78 MPa） and 5%（3% elongation）, respectively after one stretching *** the case of 7-IM/3-HBA, an increasing trend was observed in storage modulus（E'）.The room temperature storage modulus increased from 7 to 28 GPa after 3 stretching *** this case, however, there is no effect on *** as-prepared films could not be handled（too brittle） but after stretching the film once above T, a tensile strength of 161 MPa and elongation of 9% was *** the best of our knowledge, such improvements in thermo-mechanical properties in all-aromatic main-chain polymers have not been reported before.

关键词： polyesterimide molecular composite stretched films

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Frontispiece: Fabricating Dual-Atom Iron Catalysts for Efficient Oxygen Evolution Reaction: A Heteroatom Modulator Approach

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Angewandte Chemie International Edition 2020年第37期59卷

作者： Dr. Yong-Sheng Wei Dr. Liming Sun Miao Wang Dr. Jinhua Hong Dr. Lianli Zou Hongwen Liu Dr. Yu Wang Dr. Mei Zhang Dr. Zheng Liu Prof. Yinwei Li Prof. Satoshi Horike Prof. Kazu Suenaga Prof. Qiang Xu AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory (ChEM-OIL) National Institute of Advanced Industrial Science and Technology (AIST) Sakyo-ku Kyoto 606-8501 Japan Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials Department of Chemistry School of Chemistry and Materials Science Jiangsu Normal University Xuzhou 221116 P. R. China Nanomaterials Research Institute National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba 305-8565 Japan Innovative Functional Materials Research Institute National Institute of Advanced Industrial Science and Technology (AIST) 2266-98 Anagahora Shimoshidami Moriyamaku Nagoya Aichi 463-8560 Japan Laboratory of Quantum Materials Design and Application School of Physics and Electronic Engineering Jiangsu Normal University Xuzhou 221116 P. R. China Institute for Integrated Cell-Material Sciences (WPI-iCeMS) Institute for Advanced Study Kyoto University Sakyo-ku Kyoto 606-8501 Japan Research Institute of Electrochemical Energy National Institute of Advanced Industrial Science and Technology (AIST) Ikeda Osaka 563-8577 Japan

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Frontispiz: Fabricating Dual‐Atom Iron Catalysts for Efficient Oxygen Evolution Reaction: A Heteroatom Modulator Approach

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Angewandte Chemie 2020年第37期132卷

作者： Yong‐Sheng Wei Liming Sun Miao Wang Jinhua Hong Lianli Zou Hongwen Liu Yu Wang Mei Zhang Zheng Liu Yinwei Li Satoshi Horike Kazu Suenaga Qiang Xu AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory (ChEM-OIL) National Institute of Advanced Industrial Science and Technology (AIST) Sakyo-ku Kyoto 606-8501 Japan Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials Department of Chemistry School of Chemistry and Materials Science Jiangsu Normal University Xuzhou 221116 P. R. China Nanomaterials Research Institute National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba 305-8565 Japan Innovative Functional Materials Research Institute National Institute of Advanced Industrial Science and Technology (AIST) 2266-98 Anagahora Shimoshidami Moriyamaku Nagoya Aichi 463-8560 Japan Laboratory of Quantum Materials Design and Application School of Physics and Electronic Engineering Jiangsu Normal University Xuzhou 221116 P. R. China Institute for Integrated Cell-Material Sciences (WPI-iCeMS) Institute for Advanced Study Kyoto University Sakyo-ku Kyoto 606-8501 Japan Research Institute of Electrochemical Energy National Institute of Advanced Industrial Science and Technology (AIST) Ikeda Osaka 563-8577 Japan

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Synthesis and properties of three novel rhodamine-based fluorescent sensors for Hg^(2+)

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Chinese Chemical Letters 2016年第6期27卷 989-992页

作者： Miao-Miao Hong Ai-Feng Liu Ying Xu Dong-Mei Xu College of Chemistry Chemical Engineering and Materials Science Soochow University Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application Soochow University Testing and Analysis Center Soochow University

Three novel rhodamine-based Hg^2＋ fluorescent sensors were designed and synthesized. The sensors could work in semi-aqueous solutions with nearly neutral p H and showed high selectivity and sensitivity to Hg^2＋ with remarkable fluorescence enhancement. For these three sensors, the linear working range broadened（0–80, 0–100 and 0–140 μmol/L, respectively） and the sensitivity increased（7.7, 15.5 and 17.6 folds of the fluorescence enhancement and 512, 66.2 and 37.6 ppb of the detection limit） with the rising of the thiourea-unit numbers. Furthermore the sensors exhibited excellent interference immunity to multiple environmentally and biologically relevant metal ions. Pond and tap water assay showed good practicability of the sensors. The number of the bound Hg^（2＋） equaling to that of the thiourea units and the irreversible recognition process implied a new interaction way between Hg^（2＋） and the sensor.

关键词： Rhodamine Polyethylenepolyamine Thiourea Fluorescent sensor Hg2＋

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Preface: The Fourth Symposium on Innovative polymers for Controlled Delivery, September 23-26, 2016, Suzhou, China

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Journal of controlled release : official journal of the Controlled Release Society 2017年 259卷 1-2页

作者： Zhiyuan Zhong Jan Feijen Biomedical Polymers Laboratory Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 P. R. China. Electronic address: zyzhong@***. Biomedical Polymers Laboratory Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application College of Chemistry Chemical Engineering and Materials Science Soochow University Suzhou 215123 P. R. China. Electronic address: j.feijen@utwente.nl.

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Titelbild: Single‐Atom Iron Catalysts on Overhang‐Eave Carbon Cages for High‐Performance Oxygen Reduction Reaction (Angew. Chem. 19/2020)

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Angewandte Chemie 2020年第19期132卷

作者： Chun‐Chao Hou Lianli Zou Liming Sun Kexin Zhang Zheng Liu Yinwei Li Caixia Li Ruqiang Zou Jihong Yu Qiang Xu AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory (ChEM-OIL) National Institute of Advanced Industrial Science and Technology (AIST) Sakyo-ku Kyoto 606-8501 Japan Graduate School of Engineering Kobe University Nada Ku Kobe Hyogo 657-8501 Japan Laboratory of Quantum Materials Design and Application School of Physics and Electronic Engineering Jiangsu Normal University Xuzhou 221116 P. R. China Beijing Key laboratory for Theory and Technology of Advanced Battery Materials Department of Materials Science and Engineering College of Engineering Peking University Beijing 100871 P. R. China Inorganic Functional Materials Research Institute National Institute of Advanced Industrial Science and Technology (AIST) 2266-98 Anagahora Shimoshidami Moriyamaku Nagoya Aichi 463-8560 Japan State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry International Center of Future Science Jilin University Changchun 130012 P. R. China

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Cover Picture: Single-Atom Iron Catalysts on Overhang-Eave Carbon Cages for High-Performance Oxygen Reduction Reaction (Angew. Chem. Int. Ed. 19/2020)

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Angewandte Chemie International Edition 2020年第19期59卷

作者： Dr. Chun-Chao Hou Dr. Lianli Zou Dr. Liming Sun Dr. Kexin Zhang Dr. Zheng Liu Prof. Yinwei Li Dr. Caixia Li Prof. Ruqiang Zou Prof. Jihong Yu Prof. Qiang Xu AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory (ChEM-OIL) National Institute of Advanced Industrial Science and Technology (AIST) Sakyo-ku Kyoto 606-8501 Japan Graduate School of Engineering Kobe University Nada Ku Kobe Hyogo 657-8501 Japan Laboratory of Quantum Materials Design and Application School of Physics and Electronic Engineering Jiangsu Normal University Xuzhou 221116 P. R. China Beijing Key laboratory for Theory and Technology of Advanced Battery Materials Department of Materials Science and Engineering College of Engineering Peking University Beijing 100871 P. R. China Inorganic Functional Materials Research Institute National Institute of Advanced Industrial Science and Technology (AIST) 2266-98 Anagahora Shimoshidami Moriyamaku Nagoya Aichi 463-8560 Japan State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry International Center of Future Science Jilin University Changchun 130012 P. R. China

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