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学者姓名：李昂
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Abstract ：
The investigation of active site evolution and reaction intermediates during the catalytic oxidation process has paramount importance for the development of highly efficient catalysts for soot oxidation. Nevertheless, soot oxidation involves complex gas-solid-solid reaction pathways, and challenges persist in precisely investigating the active sites and intermediates. Herein, single-atom Ag1O5 catalysts with uniform active sites were constructed from Ag nanoparticles assisted by the interplay between the surface defects of Mn2O3 and temperature-induced diffusion. Based on the use of Ag1/Mn2O3 as a model catalyst and in situ environmental electron microscopy results, the soot particles show diffusion behavior toward the Ag1/Mn2O3 catalyst, and the Ag single-atom active sites significantly decrease the required reaction temperature for soot oxidation. Consequently, the oxidation reaction occurs at the active sites of the individual Ag atoms, leading to the formation of AgC intermediates. This research provides critical insights for the design and fabrication of highly efficient and stable catalysts for soot oxidation.
Keyword ：
Atomic dispersion Atomic dispersion In situ TEM In situ TEM Soot oxidation Soot oxidation
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| GB/T 7714 | Lv, Qian , Jin, Baofang , Xu, Hengyue et al. Atomic dispersion of Ag on Mn2O3 for soot catalytic oxidation: Dispersion mechanism and catalytic intermediate identification [J]. | MATERIALS TODAY NANO , 2025 , 29 . |
| MLA | Lv, Qian et al. "Atomic dispersion of Ag on Mn2O3 for soot catalytic oxidation: Dispersion mechanism and catalytic intermediate identification" . | MATERIALS TODAY NANO 29 (2025) . |
| APA | Lv, Qian , Jin, Baofang , Xu, Hengyue , Wu, Xiaodong , Zhang, Ningqiang , Pang, Dawei et al. Atomic dispersion of Ag on Mn2O3 for soot catalytic oxidation: Dispersion mechanism and catalytic intermediate identification . | MATERIALS TODAY NANO , 2025 , 29 . |
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Abstract ：
AuCu nanoalloys are typical multicompent catalysts that have been widely used because of their highly reduced cost. The oxidation is a highly common reaction mode during catalysis, in which the material morphology, composition, and surface defects can affect the initiation of oxidation and aggravate the oxidation. The effects of the atomic-scale oxidation process on the adsorption, nucleation and growth of the AuCu nanocrystalline films were observed by in situ environmental transmission electron microscopy. The structural impacts of different types of defects on the oxide nucleation process have been revealed, and the preferred oxidation sequence is surface grain boundaries first, then surface zigzag edges, and, finally, the orderly crystal surface. Such a structural oxidation sequence can be attributed to the coordination number of AuCu nanoalloys, with those with large numbers tending to adsorb more oxygen atoms and preferring to nucleate in this region. Nucleation and growth on the newly formed oxide crystal were disordered, resulting in structural order. The oxidation process prompts oxide particle rotation, and this rotation accelerates the combination of particles. An in situ study of the microstructures of a AuCu alloy subjected to oxidation provides key evidence for studying the failure mechanism of the catalytic properties of nanoalloys.
Keyword ：
AuCu alloy AuCu alloy In situ In situ Environmental transmission electron Environmental transmission electron Atomic structure Atomic structure Oxidation Oxidation microscopy microscopy
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| GB/T 7714 | Pei, Xingfei , Wang, Zhanxin , Chen, Yanhui et al. Surface structure-dependent nucleation and rotated sintering of an initially oxidized AuCu nanoalloy [J]. | APPLIED SURFACE SCIENCE , 2025 , 693 . |
| MLA | Pei, Xingfei et al. "Surface structure-dependent nucleation and rotated sintering of an initially oxidized AuCu nanoalloy" . | APPLIED SURFACE SCIENCE 693 (2025) . |
| APA | Pei, Xingfei , Wang, Zhanxin , Chen, Yanhui , Liu, Mingzhe , Lu, Hui , Li, Ang et al. Surface structure-dependent nucleation and rotated sintering of an initially oxidized AuCu nanoalloy . | APPLIED SURFACE SCIENCE , 2025 , 693 . |
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Abstract ：
Supported alloy catalysts have been extensively applied to many significant industrial chemical processes due to the abundant active sites with distinguishable geometry and electron states. However, a detailed in situ investigation of the interaction between support and alloy nanoparticles is still lacking. Here, a subversive 'tearing effect' on the interface of TiO2-supported NiRu alloy nanoparticles is in situ discovered by environmental transmission electron microscopy (ETEM) with a dramatic redispersion process of alloy nanoparticles from similar to 25 nm to 2-3 nm under the repeated hydrogen reduction. Dual-driven by the distinct alloy-support interaction involving the restructuring of alloy nanoparticles and growth of TiOx overlayer, larger NiRu alloy nanoparticles spontaneously disintegrate into atoms migrating on support. Atoms are finally captured by the defects generated on TiO2 during the repeat reduction, which also confines the further growth of the newly alloy nanoparticles. Owing to this specific alloy-support interaction, smaller alloy nanoparticles on TiO2 support are much more stable than the bigger ones, which holds promise for industrial applications as durable catalysts. This novel metal-support interaction with the 'tearing effect' revealed on supported alloy catalysts provides new knowledge on the structure-performance relationships in all the alloy catalysts for hydrogenation reactions.
Keyword ：
metal-support interaction metal-support interaction heterogeneous catalysis heterogeneous catalysis mechanism mechanism alloy alloy redispersion redispersion
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| GB/T 7714 | Zou, Sibei , Cao, Liwei , Zhang, Xingmo et al. 'Tearing Effect' of Alloy-Support Interaction for Alloy Redispersion in NiRu/TiO2 Hydrogenation Catalysts [J]. | ANGEWANDTE CHEMIE-INTERNATIONAL EDITION , 2025 , 64 (16) . |
| MLA | Zou, Sibei et al. "'Tearing Effect' of Alloy-Support Interaction for Alloy Redispersion in NiRu/TiO2 Hydrogenation Catalysts" . | ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 64 . 16 (2025) . |
| APA | Zou, Sibei , Cao, Liwei , Zhang, Xingmo , Chen, Chaoqi , Tada, Mizuki , Muratsugu, Satoshi et al. 'Tearing Effect' of Alloy-Support Interaction for Alloy Redispersion in NiRu/TiO2 Hydrogenation Catalysts . | ANGEWANDTE CHEMIE-INTERNATIONAL EDITION , 2025 , 64 (16) . |
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Abstract ：
Grain boundary (GB) plastic deformation is a critical deformation mode that can significantly affect the microstructure and mechanical properties of metals. Given its importance, numerous studies have been conducted over the past few decades to investigate the atomistic mechanism of GB plasticity, which includes GB migration, GB sliding, and grain rotation. These three deformation modes typically occur simultaneously and interact cooperatively. Despite substantial advancements in understanding the atomic-scale mechanisms of GB plasticity, there is a scarcity of review papers addressing the in situ atomic-scale mechanisms of GB plasticity. This work aims to provide a comprehensive overview of the atomistic mechanisms of GB plasticity in metals, detailing modes predicted by theoretical models and molecular dynamics (MD) simulations, as well as discussing mechanisms verified by in situ atomic-scale experiments. Additionally, it examines the factors influencing GB deformation. The authors intend for this review to serve not only as a valuable resource for researchers in the field of nanocrystalline (NC) metals but also as a textbook for educating graduate students.
Keyword ：
atomic-scale atomic-scale deformation mechanism deformation mechanism GB plasticity GB plasticity
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| GB/T 7714 | Zhang, Zihao , Feng, Yuanyuan , Zhang, Xu et al. In Situ Atomic-Scale Experiments Reveal the Atomistic Mechanisms of Grain Boundary Plasticity [J]. | ADVANCED FUNCTIONAL MATERIALS , 2024 , 35 (1) . |
| MLA | Zhang, Zihao et al. "In Situ Atomic-Scale Experiments Reveal the Atomistic Mechanisms of Grain Boundary Plasticity" . | ADVANCED FUNCTIONAL MATERIALS 35 . 1 (2024) . |
| APA | Zhang, Zihao , Feng, Yuanyuan , Zhang, Xu , Yang, Chengpeng , Ma, Yan , Li, Zhipeng et al. In Situ Atomic-Scale Experiments Reveal the Atomistic Mechanisms of Grain Boundary Plasticity . | ADVANCED FUNCTIONAL MATERIALS , 2024 , 35 (1) . |
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Abstract ：
过渡金属硫族化合物(TMDCs)材料具有优异的电学和光电性能,在下一代光电子器件中具有广阔的应用前景.然而,大面积均匀生长单层的TMDCs仍然具有相当大的挑战.本工作提出了一种简单而有效的利用化学气相沉积(CVD)制备大面积单层二硫化钼(MoS_2)的方法,并通过调整氧化物前驱体的比例,调整MoS_2单晶/薄膜生长.随后,利用叉指电极掩膜板制备出单层MoS_2薄膜光电探测器.最后,在405 nm激光激发下,不同电压和不同激光功率条件下均表现出高稳定和可重复的光电响应,响应时间可达毫秒(ms)量级.此外,该光电探测器实现了405—830 nm的可见光到近红外的宽光谱检测范围,光响应度(R)高达291.7 mA/W,光探测率(D~*)最高达1.629×10~9 Jones.基于该CVD制备的单层MoS2薄膜光电探测器具有成本低、能大规模制备,且在可见光到近红外的宽光谱范围内具有良好的稳定性和重复性的优点,为未来电子和光电子器件的应用提供了更多的可能性.
Keyword ：
光电响应 光电响应 MoS_2 MoS_2 光电探测器 光电探测器 化学气相沉积 化学气相沉积
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| GB/T 7714 | 武鹏 , 谈论 , 李炜 et al. 大面积单层二硫化钼的制备及其光电性能 [J]. | 物理学报 , 2023 , 72 (11) : 302-308 . |
| MLA | 武鹏 et al. "大面积单层二硫化钼的制备及其光电性能" . | 物理学报 72 . 11 (2023) : 302-308 . |
| APA | 武鹏 , 谈论 , 李炜 , 曹立伟 , 赵俊博 , 曲尧 et al. 大面积单层二硫化钼的制备及其光电性能 . | 物理学报 , 2023 , 72 (11) , 302-308 . |
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Abstract ：
The research and development of high-performance NH3 sensors are of great significance for environment monitoring and disease diagnosis applications. Two-dimensional (2D) MoS2 nanomaterials have exhibited great potential for building room-temperature (RT) NH3 sensors but still suffer from relatively low sensitivity. Herein, the TiO2-modified monolayer MoS2 films with controllable TiO2 loading contents are fabricated by a facile approach. A remarkable enhancement in the RT NH3 sensing performance is achieved after the n-n hetero-compositing of the TiO2/MoS2 system. The device with 95% surface coverage of TiO2 shows enhanced sensor response, low detection limit (0.5 ppm), wide detection range (0.5-1000 ppm), good repeatability, and superior selectivity against other gases. In situ Kelvin potential force microscopy results revealed that the TiO2 modification not only improved the surface reactivity of the sensing layers but also contributed to the NH3 sensing performance by serving as the "gas-gating" layers that modulated the electron depletion layer and the conductivity of the MoS2 films. Such an n-n hetero-compositing strategy can provide a simple and cost-effective approach for developing high-performance NH3 sensors based on 2D semiconductors.
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| GB/T 7714 | Tan, Lun , Liu, Xianzhen , Wu, Peng et al. TiO2-modified MoS2 monolayer films enable sensitive NH3 sensing at room temperature [J]. | NANOSCALE , 2023 , 15 (35) : 14514-14522 . |
| MLA | Tan, Lun et al. "TiO2-modified MoS2 monolayer films enable sensitive NH3 sensing at room temperature" . | NANOSCALE 15 . 35 (2023) : 14514-14522 . |
| APA | Tan, Lun , Liu, Xianzhen , Wu, Peng , Cao, Liwei , Li, Wei , Li, Ang et al. TiO2-modified MoS2 monolayer films enable sensitive NH3 sensing at room temperature . | NANOSCALE , 2023 , 15 (35) , 14514-14522 . |
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Abstract ：
Transition metal dichalcogenide (TMDC) monolayers exhibit enhanced electrical and optoelectrical properties, which are promising for next-generation optoelectronic devices. However, large-scale and uniform growth of TMDC monolayers with large grain size is still a considerable challenge. Presented in this work is a simple and effective approach to fabricating largescale molybdenum (MoS2) disulfide monolayers by chemical vapor deposition (CVD) method. It is found that MoS2 grows from single crystal into thin film with the increase of oxide precursor proportion. The photodetector of large scale monolayer layer MoS2 film is fabricated by depositing metal electrodes on the interdigital electrode mask through using thermal evaporation coating. Finally, the highly stable and repeatable photoelectric responses under the conditions of different voltages and different laser power are characterized under 405-nm laser excitation, with response time decreasing down to the order of milliseconds (ms). In addition, the photodetector achieves a wide spectral detection range from 405 nm to 830 nm, that is, from visible light to near-infrared light wavelength range, with optical response (R) of 291.7 mA/W and optical detection rate (D*) of 1.629x109 Jones. The monolayer MoS2 thin film photodetector demonstrated here has the advantages of low cost, feasibility of large-scale preparation, and good stability and repeatability in the wide spectrum range from visible light to near infrared light wavelength, providing the possibilities for future applications of electronic and optoelectronic devices .
Keyword ：
photoelectric response photoelectric response chemical vapor deposition chemical vapor deposition MoS2 MoS2 photodetector photodetector
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| GB/T 7714 | Peng, Wu , Lun, Tan , Wei, Li et al. Preparation and photoelectric property of large scale monolayer MoS2 [J]. | ACTA PHYSICA SINICA , 2023 , 72 (11) . |
| MLA | Peng, Wu et al. "Preparation and photoelectric property of large scale monolayer MoS2" . | ACTA PHYSICA SINICA 72 . 11 (2023) . |
| APA | Peng, Wu , Lun, Tan , Wei, Li , Li-Wei, Cao , Jun-Bo, Zhao , Yao, Qu et al. Preparation and photoelectric property of large scale monolayer MoS2 . | ACTA PHYSICA SINICA , 2023 , 72 (11) . |
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Abstract ：
The outstanding corrosion resistance of stainless-steel is from its passive oxide. Environmental transmission electron microscope was used in a modern atomic-scale in situ initial oxidation analysis process to reveal the microstructural and elemental variation on its breakdown. An amorphous oxide layer was the main oxide when temperatures is lower than 500 degrees C, and pits formed from 500 degrees C, and a porous structure formed from 700 degrees C. The protective passive films on the oxide/alloy interface were damaged by priority structural oxidation and prompted further alloy failure. The study provides direct experimental data beyond that of traditional research.
Keyword ：
ETEM ETEM Atomic scale Atomic scale In situ In situ Stainless steel Stainless steel Oxidation Oxidation
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| GB/T 7714 | Chen, Yanhui , Tang, Pengfei , Qiao, Shihang et al. Dynamic breakdown of passive films on stainless steel during in situ thermal oxidation [J]. | CORROSION SCIENCE , 2022 , 209 . |
| MLA | Chen, Yanhui et al. "Dynamic breakdown of passive films on stainless steel during in situ thermal oxidation" . | CORROSION SCIENCE 209 (2022) . |
| APA | Chen, Yanhui , Tang, Pengfei , Qiao, Shihang , Liu, Shanshan , Yang, Xiaomeng , Li, Ang . Dynamic breakdown of passive films on stainless steel during in situ thermal oxidation . | CORROSION SCIENCE , 2022 , 209 . |
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Abstract ：
In order to use III-V compound semiconductors as active channel materials in advanced electronic and quantum devices, it is important to achieve a good epitaxial growth on silicon substrates. As a first step toward this, we report on the selective-area growth of GaP/InGaP/InP/InAsP buffer layer nanotemplates on GaP substrates which are closely lattice-matched to silicon, suitable for the integration of in-plane InAs nanowires. Scanning electron microscopy reveals a perfect surface selectivity and uniform layer growth inside 150 and 200 nm large SiO2 mask openings. Compositional and structural characterization of the optimized structure performed by transmission electron microscopy shows the evolution of the major facet planes and allows a strain distribution analysis. Chemically uniform layers with well-defined heterointerfaces are obtained, and the topmost InAs layer is free from any dislocation. Our study demonstrates that a growth sequence of thin layers with progressively increasing lattice parameters is effective to efficiently relax the strain and eventually obtain high quality in-plane InAs nanowires on large lattice-mismatched substrates.
Keyword ：
InAs InAs in-plane nanowires in-plane nanowires selective-area epitaxy selective-area epitaxy
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| GB/T 7714 | Zannier, Valentina , Li, Ang , Rossi, Francesca et al. Selective-Area Epitaxy of InGaAsP Buffer Multilayer for In-Plane InAs Nanowire Integration [J]. | MATERIALS , 2022 , 15 (7) . |
| MLA | Zannier, Valentina et al. "Selective-Area Epitaxy of InGaAsP Buffer Multilayer for In-Plane InAs Nanowire Integration" . | MATERIALS 15 . 7 (2022) . |
| APA | Zannier, Valentina , Li, Ang , Rossi, Francesca , Yadav, Sachin , Petersson, Karl , Sorba, Lucia . Selective-Area Epitaxy of InGaAsP Buffer Multilayer for In-Plane InAs Nanowire Integration . | MATERIALS , 2022 , 15 (7) . |
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Abstract ：
In situ environmental transmission electron microscope (ETEM) could provide intuitive and solid proof for the local structure and chemical evolution of materials under practical working conditions. In particular, coupled with atmosphere and thermal field, the behavior of nano catalysts could be directly observed during the catalytic reaction. Through the change of lattice structure, it can directly correlate the relationship between the structure, size and properties of materials in the nanoscale, and further directly and accurately, which is of great guiding value for the study of catalysis mechanism and the optimization of catalysts. As an outstanding catalytic material in the application of methane reforming, molybdenum oxide (MoO3)-based materials and its deoxidation process were studied by in situ ETEM method. The corresponding microstructures and components evolution were analyzed by diffraction, high-resolution transmission electron microscopy (HRTEM) and electron energy loss spectrum (EELS) techniques. MoO3 had a good directional deoxidation process accompanied with the process of nanoparticles crushing and regrowth in hydrogen (H-2) and thermal field. However, in the absence of H-2, the samples would exhibit different structural evolution.
Keyword ：
MoO3 MoO3 TEM TEM deoxidation deoxidation in situ in situ
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| GB/T 7714 | Ma, Peijie , Li, Ang , Wang, Lihua et al. Investigation of Deoxidation Process of MoO3 Using Environmental TEM [J]. | MATERIALS , 2022 , 15 (1) . |
| MLA | Ma, Peijie et al. "Investigation of Deoxidation Process of MoO3 Using Environmental TEM" . | MATERIALS 15 . 1 (2022) . |
| APA | Ma, Peijie , Li, Ang , Wang, Lihua , Zheng, Kun . Investigation of Deoxidation Process of MoO3 Using Environmental TEM . | MATERIALS , 2022 , 15 (1) . |
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