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学者姓名：韩晓东
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Abstract ：
目的 阴极荧光（CL）成像是一种以电子束为激发源的高分辨荧光成像技术，但生物材料对电子束的敏感性限制了CL技术在生命科学中的广泛应用。为了研究和发展CL技术在生物样品中的应用，本文旨在通过探究电子辐照引起碳基材料的结构损伤、有机基团的降解及荧光猝灭等问题，深入理解电子源对有机荧光团的激发特性。方法 本研究应用扫描电镜（SEM）和阴极荧光谱仪系统（SEM-CL），研究电子源对有机荧光团及荧光探针标记细胞的激发特性，观测了有机物的CL信号的发射特性、强度衰减、成像方式及特点。结果 实验结果显示，在低能量（2.5～5 keV）和低束流（～10 pA）电子辐照下，有机荧光微珠发射出较强的荧光，CL像分辨率达到～30 nm。荧光微珠经过12 min辐照，信号强度衰减了25%,CL像仍保持了可接受的发光强度和足够的信噪比。此外，还获得了从细胞表面到内部一定深度内，荧光标记的亚细胞结构信息。结论 在SEM-CL系统中，可以同时获得由电子束激发产生的电子像和CL像，实现阴极荧光与电子显微镜关联（CCLEM）成像。本实验的研究结果为CCLEM技术应用于生物结构研究提供了数据及技术支持。
Keyword ：
扫描电镜 扫描电镜 亚细胞结构 亚细胞结构 有机荧光团 有机荧光团 阴极荧光 阴极荧光
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| GB/T 7714 | 李长硕 , 李硕果 , 季刚 et al. 有机荧光团及荧光标记细胞的阴极荧光成像研究 [J]. | 生物化学与生物物理进展 , 2023 , 50 (08) : 2006-2017 . |
| MLA | 李长硕 et al. "有机荧光团及荧光标记细胞的阴极荧光成像研究" . | 生物化学与生物物理进展 50 . 08 (2023) : 2006-2017 . |
| APA | 李长硕 , 李硕果 , 季刚 , 王丽 , 李劲涛 , 王莉 et al. 有机荧光团及荧光标记细胞的阴极荧光成像研究 . | 生物化学与生物物理进展 , 2023 , 50 (08) , 2006-2017 . |
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Abstract ：
弯曲变形是金属纳米材料最常见的变形方式之一。揭示金属纳米材料弯曲状态下的变形机制，建立微观结构、变形机制与力学性质之间的关联性，可为材料设计提供重要的理论依据。本文综述了面心立方(FCC)单晶金属纳米线在弯曲变形下力学性质与变形机制研究的主要进展：介绍了尺寸效应对弯曲应变下的材料力学性能的影响，概述了弯曲应变的大小对变形机制的影响；总结了金属纳米线中孪晶厚度对位错滑移，相变等塑性变形机制的影响；对比了金属纳米线弯曲与拉伸，压缩中变形机制的异同。最后对金属纳米线弯曲塑性变形机制研究所面临的难题以及有望解决该难题的原位实验技术的发展进行了展望。
Keyword ：
变形机制 变形机制 孪晶结构 孪晶结构 原子分辨率 原子分辨率 金属纳米线 金属纳米线 弯曲 弯曲
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| GB/T 7714 | 赵玉峰 , 李雪峤 , 王立华 et al. 面心立方结构金属纳米线弯曲变形机制研究进展 [J]. | 电子显微学报 , 2023 , 42 (02) : 238-251 . |
| MLA | 赵玉峰 et al. "面心立方结构金属纳米线弯曲变形机制研究进展" . | 电子显微学报 42 . 02 (2023) : 238-251 . |
| APA | 赵玉峰 , 李雪峤 , 王立华 , 韩晓东 . 面心立方结构金属纳米线弯曲变形机制研究进展 . | 电子显微学报 , 2023 , 42 (02) , 238-251 . |
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Abstract ：
In situ TEM mechanical stages based on micro-electromechanical systems (MEMS) have developed rapidly over recent decades. However, image-based quantification of MEMS mechanical stages suffers from the trade-off between spatial and temporal resolutions. Here, by taking in situ TEM nanoindentation as an example, we developed a novel method for image-based quantified in situ TEM mechanical tests with both high spatial and temporal resolutions. A reference beam was introduced to the close vicinity of the indenter-sample region. By arranging the indenter, the sample, and the reference beam in a micron-sized area, the indentation depth and load can be directly and dynamically acquired from the relative motion of markers on the three components, while observing the indentation process at a relatively high magnification. No alteration of viewing area is involved throughout the process. Therefore, no deformation events will be missed, and the collection rate of quantification data can be raised significantly.
Keyword ：
in situ TEM in situ TEM mechanical quantification mechanical quantification nanoindentation nanoindentation MEMS chip MEMS chip focused ion beam focused ion beam
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| GB/T 7714 | Zhang, Jiabao , Yang, Xudong , Li, Zhipeng et al. Novel Method for Image-Based Quantified In Situ Transmission Electron Microscope Nanoindentation with High Spatial and Temporal Resolutions [J]. | MICROMACHINES , 2023 , 14 (9) . |
| MLA | Zhang, Jiabao et al. "Novel Method for Image-Based Quantified In Situ Transmission Electron Microscope Nanoindentation with High Spatial and Temporal Resolutions" . | MICROMACHINES 14 . 9 (2023) . |
| APA | Zhang, Jiabao , Yang, Xudong , Li, Zhipeng , Cai, Jixiang , Zhang, Jianfei , Han, Xiaodong . Novel Method for Image-Based Quantified In Situ Transmission Electron Microscope Nanoindentation with High Spatial and Temporal Resolutions . | MICROMACHINES , 2023 , 14 (9) . |
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Abstract ：
Focused ion beam (FIB) has been adopted extensively for transmission electron microscope (TEM) sample preparation during the past decades. However, ion beam- and deposition-induced damage during transferring and mounting of the sample cannot be effectively avoided, limiting the application of FIB in ion-beam illumination-sensitive samples. A transferring device called the FIB shield is designed and fabricated to greatly reduce the damage and contamination of the sample during transfer and mounting under Ga+ beam imaging, milling and Pt deposition. Nearly damage-free transfer and precise positioning and attachment of beam-sensitive in situ TEM nanoindentation samples are achieved. The effectiveness of the shielding plate to block Ga+ radiation damage during Ga+ beam imaging and milling and that of the buffer region to alleviate sputtering damage during Pt deposition are verified by corresponding experiments.
Keyword ：
FIB FIB TEM sample preparation TEM sample preparation Pt contamination Pt contamination FIB-shield FIB-shield Ga+ damage Ga+ damage
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| GB/T 7714 | Zhang, Jiabao , Yang, Xudong , Li, Zhipeng et al. FIB-shield: a structure to safely transfer and precisely mount beam-sensitive TEM specimens under focused ion beam [J]. | PHYSICA SCRIPTA , 2023 , 98 (12) . |
| MLA | Zhang, Jiabao et al. "FIB-shield: a structure to safely transfer and precisely mount beam-sensitive TEM specimens under focused ion beam" . | PHYSICA SCRIPTA 98 . 12 (2023) . |
| APA | Zhang, Jiabao , Yang, Xudong , Li, Zhipeng , Cai, Jixiang , Zhang, Jianfei , Han, Xiaodong . FIB-shield: a structure to safely transfer and precisely mount beam-sensitive TEM specimens under focused ion beam . | PHYSICA SCRIPTA , 2023 , 98 (12) . |
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Abstract ：
Metal nanowires show promise in a broad range of applications and can be fabricated via a number of methods, such as vapor-liquid-solid process and template-based electrodeposition. However, the synthesis of Al nanowires (NWs) is still challenging from the stable alumina substrate. In this work, the Ni-catalyzed fabrication of Al NWs has been realized using various Al2O3 substrates. The growth dynamics of Al NWs on Ni/Al2O3 was studied using in situ transmission electron microscopy (TEM). The effect of alumina structures, compositions, and growth temperature were investigated. The growth of Al NWs correlates with the Na addition to the alumina support. Since no eutectic mixture of nickel aluminide was formed, a mechanism of Ni-catalyzed reduction of Al2O3 for Al NWs growth has been proposed instead of the vapor-liquid-solid mechanism. The key insights reported here are not restricted to Ni-catalyzed Al NWs growth but can be extended to understanding the dynamic change and catalytic performance of Ni/Al2O3 under working conditions.
Keyword ：
in situ transmission electron microscopy (TEM) in situ transmission electron microscopy (TEM) Al nanowires Al nanowires nanowire growth nanowire growth alumina reduction alumina reduction
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| GB/T 7714 | Wang, Zichun , Wang, Dan , Li, Ang et al. Interface catalytic reduction of alumina by nickle for the aluminum nanowire growth: Dynamics observed by in situ TEM [J]. | NANO RESEARCH , 2023 . |
| MLA | Wang, Zichun et al. "Interface catalytic reduction of alumina by nickle for the aluminum nanowire growth: Dynamics observed by in situ TEM" . | NANO RESEARCH (2023) . |
| APA | Wang, Zichun , Wang, Dan , Li, Ang , Wang, Lizhuo , Han, Xiaodong , Jiang, Yijiao et al. Interface catalytic reduction of alumina by nickle for the aluminum nanowire growth: Dynamics observed by in situ TEM . | NANO RESEARCH , 2023 . |
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In recent years, lead halide perovskites have shown excellent performance in photovoltaic devices and photodetectors due to its excellent semiconductor properties and have become a hot spot in materials science.Doping rare earth elements is a promising way to improve the performances of lead halide perovskites. In this paper, we review the latest research progress of rare earths doped lead halide perovskite materials in the preparation, structures, properties, as well as radiation detectors. The doped rare earths introduce new luminescent centers and energy levels for new luminescence properties, improving the crystallinity and semiconductor performances of perovskite crystals. Therefore, rare earth doping can further improve the performance of lead halide perovskite radiation detectors.
Keyword ：
photoluminescence photoluminescence radiation detection radiation detection rare earth doping rare earth doping lead halide perovskites lead halide perovskites
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| GB/T 7714 | Chen, Weiran , Ma, Lin , Zhao, Ting et al. Rare EarthDoped Lead Halide Perovskites: Synthesis, Properties and RadiationDetectors [J]. | PROGRESS IN CHEMISTRY , 2023 , 35 (12) : 1864-1880 . |
| MLA | Chen, Weiran et al. "Rare EarthDoped Lead Halide Perovskites: Synthesis, Properties and RadiationDetectors" . | PROGRESS IN CHEMISTRY 35 . 12 (2023) : 1864-1880 . |
| APA | Chen, Weiran , Ma, Lin , Zhao, Ting , Yan, Zhengguang , Xiao, Jiawen , Wang, Zhenzhong et al. Rare EarthDoped Lead Halide Perovskites: Synthesis, Properties and RadiationDetectors . | PROGRESS IN CHEMISTRY , 2023 , 35 (12) , 1864-1880 . |
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Magnetoelasticity is the bond between magnetism and mechanics, but the intricate mechanisms via which magnetic states change due to mechanical strain remain poorly understood. Here, we provide direct nanoscale observations of how tensile strain modifies magnetic domains in a ferromagnetic Ni thin plate using in situ Fresnel defocus imaging, off-axis electron holography and a bimetallic deformation device. We present quantitative measurements of magnetic domain wall structure and its transformations as a function of strain. We observe the formation and dissociation of strain-induced periodic 180 & DEG; magnetic domain walls perpendicular to the strain axis. The magnetization transformation exhibits stress-determined directional sensitivity and is reversible and tunable through the size of the nanostructure. In this work, we provide direct evidence for expressive and deterministic magnetic hardening in ferromagnetic nanostructures, while our experimental approach allows quantifiable local measurements of strain-induced changes in the magnetic states of nanomaterials. When strain is applied to some magnetic materials, the magnetic properties and magnetization can change drastically. This coupling is referred to as magnetoelasticity, and while its history of study is long, it is still not a well-understood phenomenon. In this work, Kong et al. shed light on magnetoelasticity using a variety of experimental probes.
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| GB/T 7714 | Kong, Deli , Kovacs, Andras , Charilaou, Michalis et al. Direct observation of tensile-strain-induced nanoscale magnetic hardening [J]. | NATURE COMMUNICATIONS , 2023 , 14 (1) . |
| MLA | Kong, Deli et al. "Direct observation of tensile-strain-induced nanoscale magnetic hardening" . | NATURE COMMUNICATIONS 14 . 1 (2023) . |
| APA | Kong, Deli , Kovacs, Andras , Charilaou, Michalis , Zheng, Fengshan , Wang, Lihua , Han, Xiaodong et al. Direct observation of tensile-strain-induced nanoscale magnetic hardening . | NATURE COMMUNICATIONS , 2023 , 14 (1) . |
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Objective The correlative cathodoluminescence (CL) imaging is a high-resolution fluorescence imaging technique using electron beam as excitation source. However, the sensitivity of biomaterials to electron irradiation limits the wide application of CL technique in life science. In order to study and develop the application of CL technology in biological samples, this paper aims to deeply understand the excitation characteristics of organic fluorophore by electron source by exploring the structural damage of carbon substrate, degradation of organic groups and fluorescence quenching caused by electron irradiation. Methods We used a CL and electron microscopy (CCLEM) technique in a field emission scanning electron microscope (SEM) to observe organic fluorophores and fluorescently labeled cells. Results We studied excitation and emitting characteristics of organic fluorophores by electron beam. Under the irradiation of low energy symbolscript keV) and low current (similar to 10 pA), the fluorescent microbeads had the stronger and stable CL emission, the resolution of CL image reached similar to 30 nm. After 12 min irradiation, fluorescence intensity of microbeads decreased by 25%, and CL image still maintained acceptable fluorescence intensity and adequate signal to noise ratio. Further, fluorescently labeled subcellular structures were identified from cell surface to a certain depth inside the cell. The nuclei and organelles were well observed with a bulk-sample imaging setup, while membrane proteins, that are widely localized on the cell surface, were clearly identified with a home-made imaging setup of thin-sample. Conclusion Results provide data and technical support for the application of CCLEM in the study of biological structures. CCLEM bioimaging can also be used as an important supplement to correlative light and electron microscopy (CLEM) technique.
Keyword ：
cathodoluminescence (CL) cathodoluminescence (CL) scanning electron microscope (SEM) scanning electron microscope (SEM) subcellular structure subcellular structure organic fluorophore organic fluorophore
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| GB/T 7714 | Li, Chang-shuo , Li, Shuo-guo , Ji, Gang et al. Cathodoluminescence Imaging of Organic Fluorophores and Fluorescently Labeled Cells [J]. | PROGRESS IN BIOCHEMISTRY AND BIOPHYSICS , 2023 , 50 (8) : 2006-2017 . |
| MLA | Li, Chang-shuo et al. "Cathodoluminescence Imaging of Organic Fluorophores and Fluorescently Labeled Cells" . | PROGRESS IN BIOCHEMISTRY AND BIOPHYSICS 50 . 8 (2023) : 2006-2017 . |
| APA | Li, Chang-shuo , Li, Shuo-guo , Ji, Gang , Wang, Li , Li, Jin-tao , Jia, Xing et al. Cathodoluminescence Imaging of Organic Fluorophores and Fluorescently Labeled Cells . | PROGRESS IN BIOCHEMISTRY AND BIOPHYSICS , 2023 , 50 (8) , 2006-2017 . |
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Understanding how topologically close-packed phases (TCPs) transform between one another is one of the challenging puzzles in solid-state transformations. Here we use atomicresolved tools to dissect the transition among TCPs, specifically the mu and P (or sigma) phases in nickel-based superalloys. We discover that the P phase originates from intrinsic (110) faulted twin boundaries (FTB), which according to first-principles calculations is of extraordinarily low energy. The FTB sets up a pathway for the diffusional in-flux of the smaller 3d transition metal species, creating a Frank interstitial dislocation loop. The climb of this dislocation, with an unusual Burgers vector that displaces neighboring atoms into the lattice positions of the product phase, accomplishes the structural transformation. Our findings reveal an intrinsic link among these seemingly unrelated TCP configurations, explain the role of internal lattice defects in facilitating the phase transition, and offer useful insight for alloy design that involves different complex phases.
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| GB/T 7714 | Jin, Huixin , Zhang, Jianxin , Li, Pan et al. Atomistic mechanism of phase transformation between topologically close-packed complex intermetallics [J]. | NATURE COMMUNICATIONS , 2022 , 13 (1) . |
| MLA | Jin, Huixin et al. "Atomistic mechanism of phase transformation between topologically close-packed complex intermetallics" . | NATURE COMMUNICATIONS 13 . 1 (2022) . |
| APA | Jin, Huixin , Zhang, Jianxin , Li, Pan , Zhang, Youjian , Zhang, Wenyang , Qin, Jingyu et al. Atomistic mechanism of phase transformation between topologically close-packed complex intermetallics . | NATURE COMMUNICATIONS , 2022 , 13 (1) . |
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Lead-free bismuth-based halide perovskites and their analogues have attracted research interest for their high stability and optoelectronic properties. However, the morphology-controlled synthesis of bismuth-based perovskite nanocrystals has been rarely demonstrated. Herein, we report the colloidal synthesis of zero-dimensional (0D) Cs3BiCl6 nanosheets (NSs), Cs3Bi2Cl9 NSs/nanoplates (NPs) and Cs4MnBi2Cl12 NPs through a hot-injection method. We demonstrate that the Cs3BiCl6 NSs, as an initial product of Cs3Bi2Cl9 and Cs4MnBi2Cl12 NPs, can transform into Cs3Bi2Cl9 NSs or Cs4MnBi2Cl12 NPs via Cl-induced metal ion insertion reactions under the templating effect of Cs3BiCl6. This growth mechanism is also applicable for the synthesis of Cs4CdBi2Cl12 nanoplates. Furthermore, the alloying of Cd2+ into Cs4MnBi2Cl12 lattice could weaken the strong coupling effect between Mn and Mn, which leads to a prolonged photoluminescence lifetime and an enhanced photoluminescence quantum yield (PLQY). As a proof of concept, the alloyed Cs4MnxCd1-xBi2Cl12 NPs are used as a scintillator, which show a lowest detection limit of 134.5 nGy/s. The X-ray imaging results display a high spatial resolution of over 20 line pairs per millimeter (lp/mm). These results provide new insights in the synthesis of anisotropic bismuth-based perovskite nanocrystals and their applications in radiation detection.
Keyword ：
scintillators scintillators bismuth-based perovskites bismuth-based perovskites layered double perovskite layered double perovskite nanoplates nanoplates morphology control morphology control
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| GB/T 7714 | Wang, Chao , Xiao, Jiawen , Yan, Zhengguang et al. Colloidal synthesis and phase transformation of all-inorganic bismuth halide perovskite nanoplates [J]. | NANO RESEARCH , 2022 , 16 (1) : 1703-1711 . |
| MLA | Wang, Chao et al. "Colloidal synthesis and phase transformation of all-inorganic bismuth halide perovskite nanoplates" . | NANO RESEARCH 16 . 1 (2022) : 1703-1711 . |
| APA | Wang, Chao , Xiao, Jiawen , Yan, Zhengguang , Niu, Xiaowei , Lin, Taifeng , Zhou, Yingchun et al. Colloidal synthesis and phase transformation of all-inorganic bismuth halide perovskite nanoplates . | NANO RESEARCH , 2022 , 16 (1) , 1703-1711 . |
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