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学者姓名：王立华
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摘要 ：
Polymeric carbon nitride (C3N4) is a very attractive candidate to produce photocatalytic hydrogen peroxide (H2O2) due to its low-cost, metal-free characteristics. However, the low efficiency would limit its development to higher yields because of insufficient light absorption and electron-hole separation. Here, we developed a simple method to anchor CN quantum dots (QDs) onto g-C3N4 nanosheets to form a homojunction structure (HJ-C3N4), which could improve photocatalytic performance largely without introducing metal elements. Its superior efficiency is a result of the band alignment by the homojunction structure providing excellent electron-hole separation and QDs providing suppressed recombination. Simultaneously, the light responsiveness of QDs endows a wide spectrum-responsive adsorption and enhances the adsorption intensity. The H2O2 yield of the HJ-C3N4 reached 115 mu mol L-1 h(-1) in pure water by visible light, which has an 8.6x higher production than g-C3N4 nanosheets. The material design of 0D/2D homojunction could be extended to other materials with specific band alignment.
关键词 ：
Band alignment Band alignment Carbon nitride Carbon nitride H2O2 H2O2 Homojunction Homojunction Quantum dots Quantum dots
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| GB/T 7714 | Ma, Peijie , Zhang, Xu , Wang, Cong et al. Band alignment of homojunction by anchoring CN quantum dots on g-C3N4 (0D/2D) enhance photocatalytic hydrogen peroxide evolution [J]. | APPLIED CATALYSIS B-ENVIRONMENTAL , 2022 , 300 . |
| MLA | Ma, Peijie et al. "Band alignment of homojunction by anchoring CN quantum dots on g-C3N4 (0D/2D) enhance photocatalytic hydrogen peroxide evolution" . | APPLIED CATALYSIS B-ENVIRONMENTAL 300 (2022) . |
| APA | Ma, Peijie , Zhang, Xu , Wang, Cong , Wang, Zhiwei , Wang, Kaiwen , Feng, Yibo et al. Band alignment of homojunction by anchoring CN quantum dots on g-C3N4 (0D/2D) enhance photocatalytic hydrogen peroxide evolution . | APPLIED CATALYSIS B-ENVIRONMENTAL , 2022 , 300 . |
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摘要 ：
纳米Ir薄膜中缺陷结构的原子尺度研究
关键词 ：
缺陷 缺陷 多重孪晶 多重孪晶 面心立方 面心立方 位错 位错 原子尺度 原子尺度 孪晶界 孪晶界
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| GB/T 7714 | 韦如建 , 贺昕 , 王兴权 et al. 纳米Ir薄膜中缺陷结构的原子尺度研究 [J]. | 韦如建 , 2021 , 40 (2) : 101-107 . |
| MLA | 韦如建 et al. "纳米Ir薄膜中缺陷结构的原子尺度研究" . | 韦如建 40 . 2 (2021) : 101-107 . |
| APA | 韦如建 , 贺昕 , 王兴权 , 熊晓东 , 罗俊锋 , 闻明 et al. 纳米Ir薄膜中缺陷结构的原子尺度研究 . | 韦如建 , 2021 , 40 (2) , 101-107 . |
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摘要 ：
金属铱(Ir)因具有高密度,高熔点,高硬度等特点而被广泛应用于航空航天、军工等高新科技领域.但Ir的塑性差,严重影响其进一步广泛应用.金属自身的结构及缺陷对其力学性能具有重要影响,研究Ir的原子尺度微观结构可为其力学性能优化提供重要参考.本文主要利用透射电子显微镜(TEM)对纳米Ir薄膜中的缺陷类型和缺陷密度进行了研究.发现薄膜中存在高密度的孪晶以及位错.其中,薄膜中的孪晶密度为1.6×103(1/μm2).此外,研究还发现薄膜中有两大类缺陷的相互作用:位错与孪晶相互作用以及孪晶与孪晶相互作用.前者包括层错与孪晶相互作用以及全位错对孪晶的钉扎作用;孪晶之间的相互作用形态包括头对头对接式,三重孪晶和五重孪晶等多种形态.
关键词 ：
位错 位错 多重孪晶 多重孪晶 原子尺度 原子尺度 面心立方 面心立方 孪晶界 孪晶界 缺陷 缺陷
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| GB/T 7714 | 韦如建 , 贺昕 , 王兴权 et al. 纳米Ir薄膜中缺陷结构的原子尺度研究 [J]. | 电子显微学报 , 2021 , 40 (2) : 101-107 . |
| MLA | 韦如建 et al. "纳米Ir薄膜中缺陷结构的原子尺度研究" . | 电子显微学报 40 . 2 (2021) : 101-107 . |
| APA | 韦如建 , 贺昕 , 王兴权 , 熊晓东 , 罗俊锋 , 闻明 et al. 纳米Ir薄膜中缺陷结构的原子尺度研究 . | 电子显微学报 , 2021 , 40 (2) , 101-107 . |
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摘要 ：
为探究城市韧性恢复能力与空间形态特征的关系,选取长江中下游地区的20个城市作为研究对象,利用17个韧性评价指标和3个空间形态指标构建评价体系.通过因子分析提取6个韧性评价指标公共因子,利用FCM聚类算法将20个城市划分为4个等级,并分析不同等级城市的空间形态特征.研究发现:城市韧性恢复能力与空间形态特征之间存在相关关系;一级至四级韧性城市的紧凑度递减、形状分维数递增、信息熵相近.这说明城市构成要素的布局越紧凑,不同功能用地的规划越合理,韧性恢复能力越强;同时,城市韧性恢复能力越强,其避难场所、交通网络、生命线工程等设施的规划建设越合理,越能优化城市空间形态特征.
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| GB/T 7714 | 王丽华 , 马东辉 . 城市韧性恢复能力与空间形态特征相互关系研究 [J]. | 武汉理工大学学报（信息与管理工程版） , 2021 , 43 (3) : 197-202 . |
| MLA | 王丽华 et al. "城市韧性恢复能力与空间形态特征相互关系研究" . | 武汉理工大学学报（信息与管理工程版） 43 . 3 (2021) : 197-202 . |
| APA | 王丽华 , 马东辉 . 城市韧性恢复能力与空间形态特征相互关系研究 . | 武汉理工大学学报（信息与管理工程版） , 2021 , 43 (3) , 197-202 . |
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摘要 ：
本文利用原位实验技术,在透射电镜中对AuAg纳米晶薄膜裂纹扩展以及裂纹前端塑性机制进行了原位原子尺度观察。原位观察发现,在初期,裂纹在晶界处形核并沿着晶界扩展,在裂纹前端晶粒内部有形变孪晶的形核与长大。随着应变的增加,逐渐转为穿晶断裂,此时晶粒内的生长孪晶及变形孪晶均展现出良好的塑性变形能力。本实验对人们理解面心立方合金纳米晶材料的裂纹扩展机制具有一定借鉴意义。
关键词 ：
合金 合金 孪晶 孪晶 晶间裂纹 晶间裂纹 纳米晶薄膜 纳米晶薄膜 裂纹扩展 裂纹扩展 退孪晶 退孪晶
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| GB/T 7714 | 杨成鹏 , 符立波 , 郭谊忠 et al. AuAg纳米晶薄膜裂纹扩展的原位原子尺度观察 [J]. | 电子显微学报 , 2021 , 40 (05) : 489-495 . |
| MLA | 杨成鹏 et al. "AuAg纳米晶薄膜裂纹扩展的原位原子尺度观察" . | 电子显微学报 40 . 05 (2021) : 489-495 . |
| APA | 杨成鹏 , 符立波 , 郭谊忠 , 王立华 , 张泽 , 韩晓东 . AuAg纳米晶薄膜裂纹扩展的原位原子尺度观察 . | 电子显微学报 , 2021 , 40 (05) , 489-495 . |
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摘要 ：
Previous molecular simulations and experiments suggest that grain boundaries (GBs) serve as dislocation sources in nanocrystalline metals. Although a large number of studies have been carried out, direct experimental evidence of dislocation nucleation from GBs has rarely been achieved. In this work, we performed in situ transmission electron microscopy (TEM) observations for a Pt nanocrystalline film with an average grain size of -10 nm during tensile deformation. This study revealed direct evidence of dislocation nucleation at the GBs at the atomic scale. This is different from the common hypothesis predicted by molecular dynamic simulations that only partial dislocations are emitted from GBs in small-grained structures.
关键词 ：
Dislocations Dislocations Grain boundary-mediated plasticity Grain boundary-mediated plasticity Nanocrystalline metal Nanocrystalline metal Transmission electron microscopy Transmission electron microscopy
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| GB/T 7714 | Li, Xiaochen , Long, Haibo , Zhang, Jianfei et al. Direct observation of the grain boundaries acting as dislocation sources in nanocrystalline platinum [J]. | MATERIALS CHARACTERIZATION , 2021 , 181 . |
| MLA | Li, Xiaochen et al. "Direct observation of the grain boundaries acting as dislocation sources in nanocrystalline platinum" . | MATERIALS CHARACTERIZATION 181 (2021) . |
| APA | Li, Xiaochen , Long, Haibo , Zhang, Jianfei , Ma, Dongfeng , Kong, Deli , Lu, Yan et al. Direct observation of the grain boundaries acting as dislocation sources in nanocrystalline platinum . | MATERIALS CHARACTERIZATION , 2021 , 181 . |
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摘要 ：
The results of a study on the electronic states and valence band offset (VBO) in heterostructures of the transition metal oxide LaNiO3 (LNO)/SrRuO3 (SRO) grown on (001) SrTiO3 (STO) substrates are reported. X-ray photoelectron spectroscopy (XPS) data reveal the presence of Ni2+ states in LNO layer that can develop a reduced bandwidth of O-2p and Ni-3d. Further analysis of XPS data confirms the presence of a VBO, and the value of VBO is found to be +0.02 eV and -0.38 eV for the bilayers of STO/LaNiO3/SrRuO3 (BL-1) and STO/SrRuO3/LaNiO3 (BL-2), respectively. Distinct signs of VBO are noticed between the bilayers due to the relative shift of the valence band of the top layer with respect to the bottom layer. Such band shifts can lead to the charge transfer across the (3d-4d) interface, which significantly modifies the global electronic transport and magnetic properties of the bilayers. A detailed discussion on the underlying physical phenomena of electrical transport and magnetic responses triggered by the interface is also incorporated herein.
关键词 ：
electrical transport electrical transport interfacial charge transfer interfacial charge transfer LaNiO3/SrRuO3 heterostructures LaNiO3/SrRuO3 heterostructures valence band offsets valence band offsets
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| GB/T 7714 | Tanguturi, Ranganadha Gopalarao , Zhou, Peng , Yan, Zhuo et al. Study of Electronic States in LaNiO3/SrRuO3 Bilayers: Interface-Induced Magnetism and Charge Transfer [J]. | PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS , 2021 , 258 (8) . |
| MLA | Tanguturi, Ranganadha Gopalarao et al. "Study of Electronic States in LaNiO3/SrRuO3 Bilayers: Interface-Induced Magnetism and Charge Transfer" . | PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS 258 . 8 (2021) . |
| APA | Tanguturi, Ranganadha Gopalarao , Zhou, Peng , Yan, Zhuo , Qi, Yajun , Xia, Zhengcai , Liu, Yong et al. Study of Electronic States in LaNiO3/SrRuO3 Bilayers: Interface-Induced Magnetism and Charge Transfer . | PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS , 2021 , 258 (8) . |
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摘要 ：
Detwinning is an important plastic deformation mechanism that can significantly affect the mechanical properties of twin-structured metals. Although many detwinning mechanisms have been proposed for pure metals, it is unclear whether such a deformation model is valid for nanocrystalline alloys because of the lack of direct evidence. Here, the atomic-scale detwinning deformation process of a nanocrystalline AuAg alloy with an average grain size of similar to 15 nm was investigated in situ. The results show that there are three types of detwinning mechanisms in nanocrystalline AuAg alloys. The first type of detwinning results from grain boundary migration. The second type of detwinning occurs through combined layer-by-layer thinning and incoherent twin boundary migration. The last one occurs through incoherent twin boundary migration, which results from the collective motion of partial dislocations in an array.
关键词 ：
atomic scale atomic scale detwinning detwinning in situ in situ transmission electron microscopy transmission electron microscopy twin-structured twin-structured
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| GB/T 7714 | Fu, Libo , Yang, Chengpeng , Lu, Yan et al. In situ atomistic mechanisms of detwinning in nanocrystalline AuAg alloy [J]. | SCIENCE CHINA-MATERIALS , 2021 . |
| MLA | Fu, Libo et al. "In situ atomistic mechanisms of detwinning in nanocrystalline AuAg alloy" . | SCIENCE CHINA-MATERIALS (2021) . |
| APA | Fu, Libo , Yang, Chengpeng , Lu, Yan , Teng, Jiao , Kong, Deli , Guo, Yizhong et al. In situ atomistic mechanisms of detwinning in nanocrystalline AuAg alloy . | SCIENCE CHINA-MATERIALS , 2021 . |
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摘要 ：
Negative magnetoresistance (MR) is not only of great fundamental interest for condensed matter physics and materials science, but also important for practical applications, especially magnetic data storage and sensors. However, the microscopic origin of negative MR is still elusive and the nature of the negative MR in magnetic topological insulators has still not been completely elucidated. Here, we report magnetotransport studies on Cr doped (Bi1-xSbx)(2)Te-3 topological insulator thin films grown by magnetron sputtering. At the temperature of 2 K, a giant negative MR reaching 61% is observed at H = 2 T. We show that the negative MR is closely related to the position of the Fermi level, and it reaches the maximum when the Fermi level is gated near the charge neutral point. We attribute these results to the Coulomb potential due to the random composition fluctuations in Cr doped (Bi1-xSbx)(2)Te-3. Our results provide a deeper insight into the mechanism of negative MR, and are helpful to realize the quantum anomalous Hall effect in the sputtered Cr-(Bi1-xSbx)(2)Te-3 thin-film systems by tuning the Fermi level and reducing disorder effects.
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| GB/T 7714 | Guo, Qixun , Wu, Yu , Wang, Dongwei et al. Enhanced negative magnetoresistance near the charge neutral point in Cr doped topological insulator [J]. | RSC ADVANCES , 2021 , 11 (23) : 13964-13969 . |
| MLA | Guo, Qixun et al. "Enhanced negative magnetoresistance near the charge neutral point in Cr doped topological insulator" . | RSC ADVANCES 11 . 23 (2021) : 13964-13969 . |
| APA | Guo, Qixun , Wu, Yu , Wang, Dongwei , Han, Gang , Wang, Xuemin , Fu, Libo et al. Enhanced negative magnetoresistance near the charge neutral point in Cr doped topological insulator . | RSC ADVANCES , 2021 , 11 (23) , 13964-13969 . |
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摘要 ：
The platinum single-atom-catalyst is verified as a very successful route to approach the size limit of Pt catalysts, while how to further improve the catalytic efficiency of Pt is a fundamental scientific question and is challenging because the size issue of Pt is approached at the ultimate ceiling as single atoms. Here, a new route for further improving Pt catalytic efficiency by cobalt (Co) and Pt dual-single-atoms on titanium dioxide (TiO2 ) surfaces, which contains a fraction of nonbonding oxygen-coordinated Co-O-Pt dimers, is reported. These Co-Pt dimer sites originate from loading high-density Pt single-atoms and Co single-atoms, with them anchoring randomly on the TiO2 substrate. This dual-single-atom catalyst yields 13.4% dimer sites and exhibits an ultrahigh and stable photocatalytic activity with a rate of 43.467 mmol g-1 h-1 and external quantum efficiency of ≈83.4% at 365 nm. This activity far exceeds those of equal amounts of Pt single-atom and typical Pt clustered catalysts by 1.92 and 1.64 times, respectively. The enhancement mechanism relies on the oxygen-coordinated Co-O-Pt dimer coupling, which can mutually optimize the electronic states of both Pt and Co sites to weaken H* binding. Namely, the "mute" Co single-atom is activated by Pt single-atom and the activity of the Pt atom is further enhanced through the dimer interaction. This strategy of nonbonding interactive dimer sites and the oxygen-mediated catalytic mechanisms provide emerging rich opportunities for greatly improving the catalytic efficiency and developing novel catalysts with creating new electronic states.
关键词 ：
dual single-atoms dual single-atoms hydrogen evolution reaction hydrogen evolution reaction oxygen-coordination oxygen-coordination single-atomic-site catalysts single-atomic-site catalysts TiO2 photocatalysts TiO2 photocatalysts
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| GB/T 7714 | Wang Cong , Wang Kaiwen , Feng Yibo et al. Co and Pt Dual-Single-Atoms with Oxygen-Coordinated Co-O-Pt Dimer Sites for Ultrahigh Photocatalytic Hydrogen Evolution Efficiency. [J]. | Advanced materials , 2021 , 33 (13) : e2003327 . |
| MLA | Wang Cong et al. "Co and Pt Dual-Single-Atoms with Oxygen-Coordinated Co-O-Pt Dimer Sites for Ultrahigh Photocatalytic Hydrogen Evolution Efficiency." . | Advanced materials 33 . 13 (2021) : e2003327 . |
| APA | Wang Cong , Wang Kaiwen , Feng Yibo , Li Chong , Zhou Xiaoyuan , Gan Liyong et al. Co and Pt Dual-Single-Atoms with Oxygen-Coordinated Co-O-Pt Dimer Sites for Ultrahigh Photocatalytic Hydrogen Evolution Efficiency. . | Advanced materials , 2021 , 33 (13) , e2003327 . |
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