检索结果-内蒙古大学图书馆

Understanding the role of interface in advanced semiconductor nanostructure and its interplay with wave function overlap

引用

Nano Research 2020年第6期13卷 1536-1543页

作者： Chenyuan Cai Yunhao Zhao Faran Chang Xuebing Zhao Liting Yang Chongyun Liang Guowei Wang Zhichuan Niu Yi Shi Xianhu Liu Yuesheng Li Renchao Che Laboratory of Advanced Materials Department of Materials ScienceCollaborative Innovation Center of Chemistry for Energy MaterialsFudan UniversityShanghai200438China State Key Laboratory for Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing100083China National Laboratory of Solid-State Microstructures School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210093China Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationZhengzhou UniversityZhengzhou450002China

As the proportion of interfaces increases rapidly in nanomaterials,properties and quality of interfaces hugely impact the performance of advanced ***,the effect of interfaces is explored by comparatively studying two InAs/AlSb superlattices with and without the thin InAsSb layers inserted inside each InAs *** strain mapping,it indicates that the addition of interfaces leads to an increase of local strain both near interfaces and inside ***,owing to the creation of hole potential wells within the original electron wells,the charge distribution undergoes an extra electron-hole alternating arrangement in the structure with inserted layers than the uninserted *** a feature is verified to enhance electron-hole wave function overlap by theoretical simulations,which is a must for better optical ***,with an elaborate design of the inserted layers,the wave function overlap could be boosted without sacrificing other key device performances.

关键词： interface engineering energy band alignment charge distribution strain distribution semiconductor multilayer nanostructures

来源：评论

学校读者我要写书评

暂无评论

Manipulating Piezoelectric and Electro-Strain Properties of BiFeO3-BaTiO3-Based Ceramics Through Chemical Doping-Controlled Domain-Size engineering

SSRN

引用

SSRN 2025年

作者： Lin, Jiamin Liu, Bing Liu, Mengxiang Yang, Shan Zhou, Linming Hong, Zijian Zhu, Xiaoli Wu, Yongjun Li, Juan Huang, Yuhui School of Materials Science and Engineering State Key Laboratory of Silicon and Advanced Semiconductor Materials Cyrus Tang Center for Sensor Materials and Applications Institute of Fundamental and Transdisciplinary Research Zhejiang University Hangzhou310027 China Nanhu Brain-computer Interface Institute Zhejiang Hangzhou311100 China College of Electronic Information and Engineering Hangzhou Dianzi University Zhejiang Hangzhou310018 China Zhejiang Key Laboratory of Advanced Solid State Energy Storage Technology and Applications Taizhou Institute of Zhejiang University Zhejiang Taizhou318000 China School of Engineering Hangzhou City University Zhejiang Hangzhou310015 China College of Materials and Science Engineering Zhejiang University of Technology Zhejiang Hangzhou310006 China

Ferroelectric domains are crucial for the performance of piezoelectric ceramics, as the size and switching dynamics affect polarization response directly, manipulating both ferroelectric and piezoelectric properties. In this study, we achieved BiFeO3-BaTiO3 ceramics with domain sizes from macroscopic to nanoscale by incorporating a small amount of antiferroelectric phase. Contrary to the long-standing belief that smaller ferroelectric domains own lower polarization switching barriers and yield higher piezoelectricity, we found that in chemical doping-controlled domain size engineering, the smaller the domain size, the more difficult it is for polarization switching. Ceramics with the largest domain exhibited superior positive piezoelectric performance due to the sufficient polarization switching and reduced domain wall pinning, achieving a piezoelectric coefficient (d33) of 460 pC/N at 350°C. Middle-sized domains achieved optimal electro-strain performance determined by the trade-off between the domain walls pinning and the increased local tetragonal or orthorhombic symmetries, with a strain (0.29%) and an excellent piezoelectric strain coefficient (d33*) of 726.4 pm/V at 160°C. This work provides novel insights into how domain-size engineering affects domain switching and local distortion, offering guidance for performance optimization of piezoelectric ceramics. © 2025, The Authors. All rights reserved.

关键词： Piezoelectricity

来源：评论

学校读者我要写书评

暂无评论

Novel Dopamine-Derived Carbon Modified Fe-Based Metal-Organic Framework Enhanced Aptasensor Rendering Ultrasensitive Electrochemical Detection of Oxytetracycline

SSRN

引用

SSRN 2024年

作者： Song, Jialing Fan, Xiaoxuan Ee, Liang Ying Lin, Xuanhao Li, Sam Fong Yau Huang, Manhong Singapore Donghua University China Shanghai University College of Science Department of Chemistry International Joint Laboratory Catalyst Chemistry Shanghai200444 China College of Environmental Science and Engineering State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry Donghua University Shanghai201620 China National University of Singapore Department of Chemistry 3 Science Drive 3 Singapore117543 Singapore Advanced Membranes and Porous Materials Center Physical Science and Engineering Division King Abdullah University of Science and Technology Thuwal23955-6900 Saudi Arabia Chemical Engineering Program Physical Science and Engineering Division King Abdullah University of Science and Technology Thuwal23955-6900 Saudi Arabia National University of Singapore Environmental Research Institute T Lab Building 5A Engineering Drive 1 Singapore117411 Singapore

In the present work, an aptasensor with dual binding sites based on Au NPs modified with self-polymerized polydopamine (PDA) and Fe-MOF is successfully constructed. In terms of standard electron transfer, the cyclic voltammetry (CV) analysis showcases a rate constant (ks) of 96.0 s-1, signifying an exceptional electron transfer rate of oxytetracycline at the sensor interface of Apt/Au@PDA@NH2-MIL-101(Fe)/GCE. Further deepening the investigation into electrochemical kinetics using chronoamperometry (CA), we investigated the electrocatalytic parameters (Kcat) of Au@PDA@NH2-MIL-101(Fe) in relation to oxytetracycline. The results divulged an impressive average Kcat value of 3.06×105 M-1 S-1. This evidence robustly suggests the superior electrocatalytic activity of Au@PDA@NH2-MIL-101(Fe) when it comes to oxytetracycline oxidation. A custom-designed portable rapid detection platform was developed, achieving detection limits of 6.88 nM under static water flow conditions and 5.56 nM under dynamic conditions. Remarkably, the self-polymerization of PDA on Au NPs not only refines their size but also boosts their interaction with biomolecules, thereby promising excellent biocompatibility. Moreover, the abundance of -COOH groups and unsaturated Fe3+ sites on the NH2-MIL-101(Fe) surface furnishes a considerable number of grafting sites for the aptamer. More importantly, the redox interplay between Au@PDA and NH2-MIL-101(Fe) accelerates electron movement, thus amplifying the electrochemical signal and the detection sensitivity for oxytetracycline. © 2024, The Authors. All rights reserved.

关键词： Rate constants

来源：评论

学校读者我要写书评

暂无评论

A Systematic Study on Wear Behavior of Ticrnbtawx Refractory High-Entropy: Inducing Amorphization to Achieve Anti-Wear

SSRN

引用

SSRN 2024年

作者： You, Xin Li, Tao Song, Junjie Du, Yin Wang, Haifeng Lin, Pengyu Zhou, Wei Zhang, Yongsheng Hu, Litian State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal Materials Northwestern Polytechnical University Xi’an710072 China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou730000 China School of Mechanical and Aerospace Engineering Nanyang Technological University 50 Nanyang Avenue 639798 Singapore Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai Yantai264006 China School of Materials Science and Engineering China

Refractory high-entropy alloys (RHEAs) possess exceptional properties at elevated temperatures. However, their limited wear resistance at room temperature (RT) hinders their widespread application. In this work, based on compositional modulation and surface engineering strategies, two TiCrNbTaWx (x = 0, 0.5) RHEAs were prepared using spark plasma sintering. The results show that the addition of W can effectively improve the hardness (10.3 GPa) and deformation resistance of the BCC matrix, alleviating the severe adhesion and the fracture behavior. In addition, the friction-induced oxidized amorphous layer with high hardness (12.3 GPa) can further improve the anti-wear properties. Because of these, the TiCrNbTaW0.5 alloy has a low wear rate of 9×10-5 mm-3·N-1·m-1, which is 67% lower than the pristine TiCrNbTa alloy. © 2024, The Authors. All rights reserved.

关键词： High-entropy alloys

来源：评论

学校读者我要写书评

暂无评论

Phonon resonance enabled Cu(I) valence pinning in hydroxyapatite for photothermal CO2 hydrogenation

引用

science Bulletin 2025年

作者： Gao, Wanguo Lu, Zhe Leng, Yecheng Wu, Chengyang Yao, Yingfang Zhu, Xi Sun, Junchuan Yu, Xiwen Wang, Cheng Wu, Congping Wu, Wenlei Wang, Bing Wang, Lu Zou, Zhigang National Laboratory of Solid State Microstructures School of Physics Nanjing University Nanjing210008 China Eco-materials and Renewable Energy Research Center Jiangsu Key Laboratory for Nano Technology College of Engineering and Applied Sciences Nanjing University Nanjing210008 China School of Science and Engineering The Chinese University of Hong Kong Shenzhen Shenzhen518172 China Nanjing Stomatological Hospital Medicine School of Nanjing University Nanjing University Nanjing210008 China Macau Institute of Systems Engineering Macau University of Science and Technology Macau999078 China

Cu-based catalysts attract considerable attention because of their exceptional CO2 photo-/electro-/thermo-reduction capacities, where Cu(I) is generally treated as the active species. However, a significant problem hindering the large-scale applications of Cu-based catalysts is the inactivation of Cu(I) via irreversible redox to Cu(II)/Cu(0). This study proposes a Cu(I) valence pinning method based on hydroxyapatite (HAP). Experimental and theoretical studies demonstrate that the phonon resonance among the Cu(I) ions, their adjacent heteroatoms, and the intermediates adsorbed at the Cu(I) sites yields Cu(I) valence electrons in their lowest energy states. Thus, Cu(I) is stabilized, stable, and efficient photothermal CO2 hydrogenation is promoted. However, because of the change of Cu(I) coordination environment during the CO2 hydrogenation reaction, Cu(I) ions migrate into the bulk phase, leading to activity attenuation. Nevertheless, Cu(I) ions can be pulled out to the surface of HAP under the oxidative humid air condition, and the catalytic activity can be easily recovered. Thus, we propose a simple cyclic reaction/regeneration process. This enables the Ca5(FeCuCe)5-HAP catalyst to achieve the CO yield of 402.8 mmol g−1 h−1 and a CO2 conversion rate of 27.7%, which is close to the thermodynamic equilibrium. This catalyst also displays a selectivity of approximately 100% and cycle stability of 156 h at 500 °C under a pressure of 1 atmospheric. Our study provides a viable method for the scale applications of Cu(I) based catalysts in the "negative carbon" industries. © 2025 science China Press

关键词： Hydrogenolysis

来源：评论

学校读者我要写书评

暂无评论

Successive electric polarization transitions induced by high magnetic field in the single-crystal antiferromagnet Co2Mo3O8

引用

Physical Review B 2022年第6期105卷 064108-064108页

作者： Y. S. Tang G. Z. Zhou L. Lin R. Chen J. F. Wang C. L. Lu L. Huang J. H. Zhang Z. B. Yan X. M. Lu X. K. Huang X. P. Jiang J.-M. Liu Laboratory of Solid State Microstructures and Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China Department of Applied Physics College of Science Nanjing Forestry University Nanjing 210037 China Wuhan National High Magnetic Field Center and School of Physics Huazhong University of Science and Technology Wuhan 430074 China School of Materials Science and Engineering Jingdezhen Ceramic Institute Jingdezhen 333403 China

The polar antiferromagnet Co2Mo3O8 was recently reported as a new multiferroic material exhibiting remarkable second-order magnetoelectric (ME) coupling effect while no other metamagnetic transitions occurred at low magnetic field. Herein, we have investigated the ME phenomena under high magnetic field (up to 60 T) in Co2Mo3O8 single crystals and observed unique ME response associated with the changes in the hidden magnetic moment on the honeycomb lattice. Two spin-flop transitions are unambiguously defined at Hc1∼27T and Hc2∼31T under H along the c axis at 1.7 K, accompanied by two successive colossal changes of electric polarization. The results on the anisotropy of magnetoelectricity as well as the angular-dependent polarization are well consistent with the ME tensor prediction, providing a better approach to understand the evolution of magnetic structures under high magnetic field. Therefore, the hidden magnetic transitions and distinctive magnetoelectricity provide a unique platform on which the ME coupling mechanism in the presence of rich magnetic phase transitions can be explored in this 238 family.

关键词： Magnetoelectric effect Antiferromagnets Multiferroics Single crystal materials Magnetization measurements Susceptibility measurements

来源：评论

学校读者我要写书评

暂无评论

Effect of hot rolling on microstructure and tribology behaviors of Ti-50.8Ni alloy

引用

Transactions of Nonferrous Metals Society of China 2021年第4期31卷 967-979页

作者： Rui YANG Wei MA Chao WANG Ting-mei WANG Qi-hua WANG State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

We link different microstructures to tribological behaviors of Ti-50.8 Ni(mole fraction, %) in reciprocating mode at room temperature(20 ℃). Hot-rolled alloys with B2 phase exhibit lower coefficient of friction and wear rate compared to the ones with B19?. Stress-induced martensitic transformation occurs during sliding. However, multi-pass hot rolling weakens the wear resistance. In this study, microstructures were characterized through electron backscatter diffraction and transmission electron microscopy(EBSD/TEM). From the concept of energy conservation, the effects of weak intensity of hot-rolled textures on the wear resistance are minimal. Based on the result that the alloy with a higher portion of coincidence site lattice boundaries shows lower martensitic start transformation temperature in the DSC curves than that with higher KAM values, the delay on B2-B19? transformation from {112}B2 twins outweighs dislocations. Moreover, widely distributed small-angle grain boundaries owing to dynamic recovery improve the wear resistance effectively compared to those that are well-recrystallized.

关键词： Ti-50.8Ni alloy tribological performance small angle grain boundaries coincidence site lattice(CSL)boundary

来源：评论

学校读者我要写书评

暂无评论

Zwitterionic Polymer Brush-Functionalized Dual-Crosslinked Hydrogel Via Subsurface-Initiated Atom Transfer Radical Polymerization for Anti-Fouling Applications

SSRN

引用

SSRN 2023年

作者： Wang, Biwen Wang, Peng He, Baoluo Ma, Shuanhong Liu, Shujuan Ye, Qian Zhou, Feng Northwestern Polytechnical University China State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal Materials School of Materials Science and Engineering Northwestern Polytechnical University Xi'An710072 China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou730000 China

In this work, a double-network (DN) hydrogel embedded with initiator (HHy-Br) was prepared and then reinforced with Fe3+, after which the antifouling polymer (poly-sulfobetaine vinyl imidazole, PSBVI) was successfully grafted onto the HHy-Br substrate via subsurface-initiated atom transfer radical polymerization (sSI-ATRP) to obtain PSBVI-functionalized HHy-Br (HHy-PSBVI). It has been demonstrated that Fe3+ can increase the crosslinking density of HHy-Br;as a result, the tensile strength of the as-prepared hydrogel was increased from 0.07 to 1.75 MPa, as well as its anti-swelling properties were improved (from 648% to 219%). In addition, the presence of Fe3+ can efficiently promote the sSI-ATRP process. Compared with HHy-Br, the PSBVI-functionalized HHy-Br manifested a significant decrease in friction coefficient, as the grafted high-thickness PSBVI brush (about 200 µm) has excellent hydrophilicity and can form a strong hydration layer for lubrication. Furthermore, the as-prepared HHy-PSBVI also exhibits outstanding antibacterial properties against E. coli (nearly 100% were removed) and S. aureus (99% were removed), as well as a satisfactory antifouling effect against microalgae (93% Dunaliella and 92% Chlorella were removed), which is attributed to the synergistic effect between the strong hydration of the zwitterionic polymer and the good bactericidal effect of the cationic imidazole group. © 2023, The Authors. All rights reserved.

关键词： Atom transfer radical polymerization

来源：评论

学校读者我要写书评

暂无评论

Magnetically disordered ground state in the triangular-lattice antiferromagnets Rb3Yb(VO4)2 and Cs3Yb(VO4)2

arXiv

引用

arXiv 2025年

作者： Ma, Zhen Chen, Yingqi Fu, Zhongtuo Li, Shuaiwei Tong, Xin-An Du, Hong Embs, Jan Peter Zheng, Shuhan Zhang, Yongjun Liu, Meifeng Zhong, Ruidan Liu, Jun-Ming Wen, Jinsheng Hubei Key Laboratory of Photoelectric Materials and Devices School of Materials Science and Engineering Hubei Normal University Huangshi435002 China Tsung-Dao Lee Institute School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China PSI Center for Neutron and Muon Sciences PSI Villigen5232 Switzerland National Laboratory of Solid State Microstructures Department of Physics Nanjing University Nanjing210093 China Collaborative Innovation Center of Advanced Microstructures Jiangsu Physical Science Research Center Nanjing University Nanjing210093 China

Quantum spin liquids (QSLs) represent a unique quantum disordered state of matter that hosts long-range quantum entanglement and fractional excitations. However, structural disorder resulting from site mixing between different types of ions usually arises in real QSL candidates, which is considered as an obstacle to gain the insight into the intrinsic physics. Here, we have synthesized two new rare-earth compounds Rb3Yb(VO4)2 and Cs3Yb(VO4)2. X-ray diffractions reveal a perfect triangular-lattice structure with no detectable disorder. Magnetic susceptibility measurements do not capture any phase transition or spin freezing down to 1.8 K. A fit to low-temperature data indicates dominant antiferromagnetic interactions with the Curie-Weiss temperature of -1.40 K and -0.43 K for Rb3Yb(VO4)2 and Cs3Yb(VO4)2, respectively. Specific heat results show no sign of long-range magnetic order down to ∼0.1 K either, but only a Schottky anomaly that is continuously mediated by the external magnetic fields. Additionally, inelastic neutron scattering is employed to detect low-energy spin excitations in Rb3Yb(VO4)2. The absence of magnetic excitation signals as well as static magnetic order down to 97 mK aligns with the results from magnetic susceptibility and specific heat. Collectively, these findings point to a quantum disordered ground state with persistent spin dynamics, reminiscent of QSL behaviors. Our work provides a promising platform for further exploration of quantum magnetism in this new disorder-free system. Copyright © 2025, The Authors. All rights reserved.

关键词： Quantum entanglement

来源：评论

学校读者我要写书评

暂无评论

Direct Measurement of Acoustic Spectral Density and Fractional Topological Charge

引用

Physical Review Applied 2023年第3期19卷 034073-034073页

作者： Hao Ge Zi-Wei Long Xiang-Yuan Xu Jin-Guo Hua Yang Liu Bi-Ye Xie Jian-Hua Jiang Ming-Hui Lu Yan-Feng Chen National Laboratory of Solid State Microstructures & Department of Materials Science and Engineering Nanjing University Nanjing Jiangsu 210093 China Institute of Theoretical and Applied Physics School of Physical Science and Technology & Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University 1 Shizi Street Suzhou 215006 China Key Laboratory of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Laboratory of Modern Optical Technologies of Ministry of Education Soochow University Suzhou 215006 China School of Science and Engineering The Chinese University of Hong Kong Shenzhen 518172 China Jiangsu Key Laboratory of Artificial Functional Materials Nanjing University Nanjing Jiangsu 210093 China

LDOS is a fundamental spectral property that plays a central role in various physical phenomena, such as wave-matter interactions and spontaneous emissions. The role of LDOS in acoustics was uncovered only in recent years and the measurement of acoustic LDOS has not yet been achieved. Here, we report on the direct measurement of the LDOS in acoustic systems. The acoustic LDOS is quantified here through the measurement of the volume flow rate and the acoustic pressure with a local excitation-probe configuration. Based on this method, we detect the LDOS in the one-dimensional acoustic Su-Schrieffer-Heeger model and observe the fractional topological charge of the system. Our work unveils the role of the LDOS in acoustic phenomena and paves the way toward characterizing and tailoring the LDOS in acoustic systems, which holds promise for applications in acoustic emission control, energy localization, and wave-matter interaction.

关键词： Acoustic metamaterials Acoustic wave phenomena Density of states Metrology Spontaneous emission Topological phases of matter Acoustic techniques Particle image velocimetry

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：