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Elimination of Voids at Interface of β-SiC Films and Si Substrate by Laser CVD

Journal of Wuhan University of technology(materials Science) 2018年第2期33卷 356-362页

作者：朱佩佩 XU Qingfang GUO Han 涂溶 ZHANG Song YANG Meijun ZHANG Lianmeng GOTO Takashi YAN Jiasheng LI Shusen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University oJ Technology Wuhan 430070 China International School of Material Science and Engineering Wuhan University of Technology Wuhan 430070 China Institute for Materials Research Tohoku University 2-1-1 Katahira Aoba-ku Sendai 980-8577 Japan Tech Semiconductors Ltd. Xiangyang 441021 China

Void-free β-SiC films were deposited on Si（001） substrates by laser chemical vapor deposition using hexamethyldisilane（HMDS） as the precursor. The effect of the time of introducing HMDS, i e, the substrate temperature when HMDS introduced（T_（in））, on the preferred orientation, surface microstructure and void was investigated. The orientation of the deposited SiC films changed from 〈001〉 to random to 〈111〉 with increasing T_（in）. The surface showed a layer-by-layer microstructure with voids above T_（in） ≥ 773 K, and then transformed into mosaic structure without voids at T_（in）= 298 K. The mechanism of the elimination of voids was discussed. At T_（in） =298 K, Si surface can be covered by an ultrathin SiC film, which inhibits the out-diffusion of Si atoms from substrate and prohibites the formation of the voids.

关键词： voids HMDS β-SiC laser CVD

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Author Correction: Thermally activated delayed fluorescence (TADF) organic molecules for efficient X-ray scintillation and imaging

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Nature materials 2022年第7期21卷 836页

作者： Wenbo Ma Yirong Su Qisheng Zhang Chao Deng Luca Pasquali Wenjuan Zhu Yue Tian Peng Ran Zeng Chen Gaoyuan Yang Guijie Liang Tianyu Liu Haiming Zhu Peng Huang Haizheng Zhong Kangwei Wang Shaoqian Peng Jianlong Xia Huafeng Liu Xu Liu Yang Michael Yang State Key Laboratory of Modern Optical Instrumentation Institute for Advanced Photonics College of Optical Science and Engineering Zhejiang University Hangzhou China. Intelligent Optics & Photonics Research Center Jiaxing Institute of Zhejiang University Jiaxing China. MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou China. Dipartimento di Ingegneria E. Ferrari Università di Modena e Reggio Emilia Modena Italy. CNR-IOM Basovizza Trieste Italy. Department of Physics University of Johannesburg Auckland Park South Africa. State Key Laboratory of Modern Optical Instrumentation Key Laboratory of Excited-State Materials of Zhejiang Province Department of Chemistry Zhejiang University Hangzhou China. Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and Science Xiangyang China. MIIT Key Laboratory for Low Dimensional Quantum Structure and Devices School of Materials & Engineering Beijing Institute of Technology Beijing China. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices Wuhan University of Technology Wuhan China. State Key Laboratory of Modern Optical Instrumentation Institute for Advanced Photonics College of Optical Science and Engineering Zhejiang University Hangzhou China. yangyang15@***. Intelligent Optics & Photonics Research Center Jiaxing Institute of Zhejiang University Jiaxing China. yangyang15@***.

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Two-Second-Annealed 2D/3D Perovskite Films with Graded Energy Funnels and Toughened Heterointerfaces for Efficient and Durable Solar Cells

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Angewandte Chemie 2023年第38期135卷

作者： Dr. Xueqing Chang Dr. Jun-Xing Zhong Sibo Li Dr. Qin Yao Yuxuan Fang Guo Yang Ying Tan Prof. Qifan Xue Prof. Longbin Qiu Dr. Qingqian Wang Prof. Yong Peng Prof. Wu-Qiang Wu MOE Key Laboratory of Bioinorganic and Synthetic Chemistry Lehn Institute of Functional Materials School of Chemistry Sun Yat-sen University Guangzhou 510006 P. R. China School of chemistry and Materials Science Guangdong University of Education Guangzhou 510303 P.R. China SUSTech Energy Institute for Carbon Neutrality Department of Mechanical and Energy Engineering Southern University of Science and Technology Shenzhen 518055 P. R. China School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 P. R. China State Key Laboratory of Luminescent Materials and Devices Institute of Polymer Optoelectronic Materials and Devices School of Materials Science and Engineering South China University of Technology 381 Wushan Road Guangzhou 510640 P. R. China Institute of Physics Henan Academy of Sciences Mingli Road 266-38 Zhengzhou 450046 P. R. China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 Hubei P. R. China Contribution: Conceptualization (lead) Project administration (lead) Supervision (lead) Writing - review & editing (lead)

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One-pot synthesis of Bio-inspired Layered materials of 3D Graphene Network/Calcium Carbonate

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Journal of Wuhan University of technology(materials Science) 2017年第4期32卷 795-799页

作者：张晶 YAO Bin PING Hang YU Hongjian ZHANG Fan ZHANG Jinyong WANG Yucheng WANG Hao WANG Weimin 傅正义 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

A bio-inspired layered material of reduced graphene oxide（RGOs） and calcium carbonate was synthesized via a one-pot strategy in DMF/H2O mixed solvent. The experimental results show that the product is a layered material of wrinkled RGOs networks and micron-sized calcium carbonate particles with uniform granular diameter and homogeneous morphology, which are distributed between the layered gallery of the graphene scaffold. The polymorph and the morphology of the in-situ produced calcium carbonate particles can be manipulated by simply changing the temperature scheme. Besides, the graphene oxide was reduced to a certain extent, and the hierarchical wrinkles were generated in the RGOs layer by the in-situ formation of the calcium carbonate particles. This work provides a facile and controllab.e strategy for synthesizing layered material of RGOs and carbonates, and also presents a platform for making three-dimensional porous wrinkled RGOs networks.

关键词： bio-inspired layered structure one-pot synthesis graphene calcium carbonate

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Dimensional control of octahedral tilt in SrRuO3 via infinite-layered oxides

arXiv

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arXiv 2021年

作者： Lin, Shan Zhang, Qinghua Sang, Xiahan Zhao, Jiali Cheng, Sheng Huon, Amanda Jin, Qiao Chen, Shuang Chen, Shengru Guo, Haizhong He, Meng Ge, Chen Wang, Can Wang, Jia-Ou Fitzsimmons, Michael R. Gu, Lin Zhu, Tao Jin, Kui-Juan Guo, Er-Jia Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Nanostructure Research Center Wuhan University of Technology 122 Luoshi Rd. Wuhan430070 China Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Spallation Neutron Source Science Center Dongguan523803 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100190 China Neutron Scattering Division Oak Ridge National Laboratory Oak RidgeTN37831 United States School of Physical Engineering Zhengzhou University Zhengzhou450001 China Songshan Lake Materials Laboratory DongguanGuangdong523808 China

Manipulation of octahedral distortion at atomic length scale is an effective means to tune the physical ground states of functional oxides. Previous work demonstrates that epitaxial strain and film thickness are variable parameters to modify the octahedral rotation and tilt. However, selective control of bonding geometry by structural propagation from adjacent layers is rarely studied. Here we propose a new route to tune the ferromagnetic response in SrRuO3 (SRO) ultrathin layers by oxygen coordination of adjacent SrCuO2 (SCO) layers. The infinite-layered CuO2 in SCO exhibits a structural transformation from "planar-type" to "chain-type" as reducing film thickness. These two orientations dramatically modify the polyhedral connectivity at the interface, thus altering the octahedral distortion of SRO. The local structural variation changes the spin state of Ru and hybridization strength between Ru 4d and O 2p orbitals, leading to a significant change in the magnetoresistance and anomalous Hall resistivity of SRO layers. These findings could launch further investigations into adaptive control of magnetoelectric properties in quantum oxide heterostructures using oxygen coordination. © 2021, CC BY.

关键词： Ruthenium compounds

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Direct visualization of orbital electron occupancy

Research Square

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Research Square 2021年

作者： Shang, Tongtong Xiao, Dongdong Meng, Fanqi Rong, Xiaohui Liu, Xiaozhi Li, Xinyan Zhang, Qinghua Wen, Yuren Wang, Xuefeng Su, Dong Hu, Yong-Sheng Li, Hong Yu, Qian Zhang, Ze Petricek, Vaclav Wu, Lijun Gu, Lin Zuo, Jian-Min Zhu, Yimei Nan, Ce-Wen Zhu, Jing Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100049 China Songshan Lake Materials Laboratory Guangdong Dongguan523808 China State Key Lab of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Beijing100084 China School of Materials Science and Engineering University of Science and Technology Beijing Beijing100083 China Department of Materials Science and Engineering Center of Electron Microscopy State Key Laboratory of Silicon Materials Zhejiang University Hangzhou310027 China Institute of Physics Academy of Sciences of the Czech Republic Praha 8180 40 Czech Republic Condensed Matter Physics and Materials Science Division Brookhaven National Laboratory UptonNY11973 United States Department of Materials Science and Engineering University of Illinois at Urbana Champaign 1304 W Green St UrbanaIL61801 United States Beijing National Center for Electron Microscopy Laboratory of Advanced Materials Department of Materials Science and Engineering Tsinghua University Beijing100084 China

Orbital is one of the primary physical parameters that determine materials’ properties. Currently, experimentally revealing the electron occupancies of orbitals under the control of external field remains a big challenge due to the stringent requirements for samples such as the atomically sharp surface or defect-free large-size single crystals. Here, we developed a method with the combination of quantitative convergent-beam electron diffraction and synchrotron powder X-ray diffraction, and demonstrated the visualization of the real-space orbital occupancy by choosing LiCoO2 as a prototype. Through multipole modelling of the accurately measured structure factors, we found the opposite changes of Co t2g and eg orbital occupancies under different electrochemical states which can be well-correlated with the CoO6 octahedra distortion. This robust method provides a feasible route to quantify the real-space orbital occupancy on small-sized particles, and opens up a new avenue for exploring the orbital origin of physical properties for functional materials. © 2021, CC BY.

关键词： Electron diffraction

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2020 roadmap on two-dimensional materials for energy storage and conversion

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Chinese Chemical Letters 2019年第12期30卷 2053-2064页

作者： Baolin Xu Shihan Qi Mengmeng Jin Xiaoyi Cai Linfei Lai Zhouting Sun Xiaogang Han Zifeng Lin Hui Shao Peng Peng Zhonghua Xiang Johan E.ten Elshof Rou Tan Chen Liu Zhaoxi Zhang Xiaochuan Duan Jianmin Ma School of Physics and Electronics Hunan UniversityChangsha 410082China Key Laboratory of Flexible Electronics&Institute of Advanced Materials(IAM) Jiangsu National Synergistic Innovation Center for Advanced Materials(SICAM)Nanjing Tech UniversityNanjing 210009China School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore 637371Singapore State Key Lab of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'an 710049China College of Materials Science and Engineering Sichuan UniversityChengdu 610065China UniversitéPaul Sabatier Laboratoire CIRIMAT UMR CNRS 5085Toulouse 31062France Réseau sur le Stockage Electrochimique de l’Energie(RS2E) CNRS 3459AmiensFrance State Key Laboratory of Organic–Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China University of Twente AE Enschede 7500the Netherlands Pen-Tung Sah Institute of Micro-Nano Science and Technology Xiamen UniversityXiamen 361005China Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationZhengzhou UniversityZhengzhou 450002China

Energy storage and conversion have attained significant intere st owing to its important applications that reduce CO2 emission through employing green *** promising technologies are included metalair batteries,metal-sulfur batteries,metal-ion batteries,electrochemical capacitors,***,metal elements are involved with lithium,sodium,and *** these devices,electrode materials are of importance to obtain high ***-dimensional(2 D) materials are a large kind of layered structured materials with promising future as energy storage materials,which include graphene,black phosporu s,MXenes,covalent organic frameworks(COFs),2 D oxides,2 D chalcogenides,and *** progress has been achieved to go ahead for 2 D materials in energy storage and *** researchers will join in this research *** the background,it has motivated us to contribute with a roadmap on ’two-dimensional materials for energy storage and conversion.

关键词： Graphene Black phosphorus MXenes Covalent organic frameworks Oxides Chalcogenides Metal-air batteries Metal-sulfur batteries Metal-ion batteries Electrochemical capacitors

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Eco-friendly high-performance silicide thermoelectric materials

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National Science Review 2017年第4期4卷 611-626页

作者： Wei Liu Kang Yin Qingjie Zhang Ctirad Uher Xinfeng Tang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Department of Physics University of Michigan

Silicide-based thermoelectrics are examples of cost-efficient and environmentally friendly new energy materials, which can be used for power-generation applications in the range of 500–800 K. We review the research focusing on the exploration of n-type Mg2IV-based solid solutions(IV = Si, Ge and Sn) and summarize the most prominent discoveries achieved so far in their studies. Owing to their superior performance compared to other silicides, including p-type Mg2IV, higher manganese silicides(HMS) are commonly considered as a suitable p-type material to be used in thermoelectric modules in conjunction with n-type Mg2IV-based solid solutions for mid-temperature power-generation applications. We describe the strategies used to improve the thermal and electronic transport properties of n-type Mg2IV-based solid solutions and mention some key features of HMS. We also point out the importance of mechanical properties and thermal stability of this family of materials and offer perspectives on the future research work to further improve their performance.

关键词： silicides band convergence carrier doping composition manipulation mechanical properties thermal stability

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Fast Mineralization of Densely Packed Hydroxyapatite Layers in the Presence of Over-expressed Recombinant Amelogenin

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Journal of Wuhan University of technology(materials Science) 2017年第2期32卷 256-263页

作者：王梦湖 XIE Hao XIE Jingjing PING Hang TAN Tiening JI Wei 傅正义 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology School of Science Wuhan University of Technology

Learning from the process of biominerals formation provides tremendous ideas for developing advanced synthesis techniques. According to the structure formation of tooth enamel, a recombinant amelogenin his-Amel X was designed and constructed. The protein was over-expressed and could be conveniently purified in one-step heat treatment. The mineralization process of hydroxyapatite was initiated by enzyme AP and regulated by the recombinant amelogenin. Effects of solution pH value and mineralization duration were studied. It was demonstrated that his-Amel X could induce the nucleation of apatite and quicken the growth rate at pH 7.0-7.4, while impeded hydroxyapatite growth at pH 6.8. Moreover, a much denser layer of hydroxyapatite was achieved with the addition of his-Amel X. The present study may not only provide insight into the formation of natural biomaterials but also open a new path to prepare materials under environmentally benign conditions.

关键词： biomineralization recombinant amelogenin hydroxyapatite bioprocess inspired synthesis

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Accelerated life-time test of MEA durability under vehicle operating conditions in PEM fuel cell

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Frontiers in Energy 2017年第3期11卷 326-333页

作者： Tian TIAN Jianjun TANG Wei GUO Mu PAN State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Hubei Provincical Key Laboratory of Fuel Cell Wuhan University of Technology Wuhan 430070 China

In this paper, a novel accelerated test method was proposed to analyze the durability of MEA, considering the actual operation of the fuel cell vehicle. The proposed method includes 7 working conditions： open circuit voltage （OCV）, idling, rated output, overload, idling-rated cycle, idling-overload cycle, and OCV-idling cycle. The experimental results indicate that the proposed method can effectively destroy the MEA in a short time （165 h）. Moreover, the degradation mechanism of MEA was analyzed by measuring the polarization curve, CV, SEM and TEM. This paper may provide a new research direction for improving the durability of fuel cell.

关键词： polymer electrolyte membrane fuel cell accelerated life-time test load cycling test durability

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