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Probing the Nucleation and Growth Kinetics of Bismuth Nanoparticles via In-situ Transmission Electron Microscopy
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作者 王浪 李超凡 +3 位作者 RAN Maojin YUAN Manman 胡执一 LI Yu 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2024年第4期877-887,共11页
The nucleation and growth mechanism of nanoparticles is an important theory,which can guide the preparation of nanomaterials.However,it is still lacking in direct observation on the details of the evolution of interme... The nucleation and growth mechanism of nanoparticles is an important theory,which can guide the preparation of nanomaterials.However,it is still lacking in direct observation on the details of the evolution of intermediate state structure during nucleation and growth.In this work,the evolution process of bismuth nanoparticles induced by electron beam was revealed by in-situ transmission electron microscopy(TEM)at atomic scale.The experimental results demonstrate that the size,stable surface and crystallographic defect have important influences on the growth of Bi nanoparticles.Two non-classical growth paths including single crystal growth and polycrystalline combined growth,as well as,corresponding layer-by-layer growth mechanism along{012}stable crystal plane of Bi nanoparticles with dodecahedron structure were revealed by in-situ TEM directly.These results provide important guidance and a new approach for in-depth understanding of the nucleation and growth kinetics of nanoparticles. 展开更多
关键词 bismuth nanoparticles crystal growth transmission electron microscopy in-situ electron microscopy
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Ultrafast photoemission electron microscopy:A multidimensional probe of nonequilibrium physics
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作者 戴亚南 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第3期24-57,共34页
Exploring the realms of physics that extend beyond thermal equilibrium has emerged as a crucial branch of condensed matter physics research.It aims to unravel the intricate processes involving the excitations,interact... Exploring the realms of physics that extend beyond thermal equilibrium has emerged as a crucial branch of condensed matter physics research.It aims to unravel the intricate processes involving the excitations,interactions,and annihilations of quasi-and many-body particles,and ultimately to achieve the manipulation and engineering of exotic non-equilibrium quantum phases on the ultrasmall and ultrafast spatiotemporal scales.Given the inherent complexities arising from many-body dynamics,it therefore seeks a technique that has efficient and diverse detection degrees of freedom to study the underlying physics.By combining high-power femtosecond lasers with real-or momentum-space photoemission electron microscopy(PEEM),imaging excited state phenomena from multiple perspectives,including time,real space,energy,momentum,and spin,can be conveniently achieved,making it a unique technique in studying physics out of equilibrium.In this context,we overview the working principle and technical advances of the PEEM apparatus and the related laser systems,and survey key excited-state phenomena probed through this surface-sensitive methodology,including the ultrafast dynamics of electrons,excitons,plasmons,spins,etc.,in materials ranging from bulk and nano-structured metals and semiconductors to low-dimensional quantum materials.Through this review,one can further envision that time-resolved PEEM will open new avenues for investigating a variety of classical and quantum phenomena in a multidimensional parameter space,offering unprecedented and comprehensive insights into important questions in the field of condensed matter physics. 展开更多
关键词 ultrafast photoemission electron microscopy ultrafast momentum microscopy excited state physics
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Revealing the microstructures of metal halide perovskite thin films via advancedtransmission electron microscopy
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作者 Yeming Xian Xiaoming Wang Yanfa Yan 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第9期30-41,共12页
Metal halide perovskites (MHPs) are excellent semiconductors that have led to breakthroughs in applications in thinfilmsolar cells, detectors, and light-emitting diodes due to their remarkable optoelectronic propertie... Metal halide perovskites (MHPs) are excellent semiconductors that have led to breakthroughs in applications in thinfilmsolar cells, detectors, and light-emitting diodes due to their remarkable optoelectronic properties and defect tolerance.However, the performance and stability of MHP-based devices are significantly influenced by their microstructures includingthe formation of defects, composition fluctuations, structural inhomogeneity, etc. Transmission electron microscopy(TEM) is a powerful tool for direct observation of microstructure at the atomic-scale resolution and has been used to correlatethe microstructure and performance of MHP-based devices. In this review, we highlight the application of TEMtechniques in revealing the microstructures of MHP thin films at the atomic scale. The results provide critical understandingof the performance of MHP devices and guide the design of strategies for improving the performance and stability ofMHP devices. 展开更多
关键词 PEROVSKITE DEFECT INHOMOGENEITY transmission electron microscopy
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Recent progress about transmission electron microscopy characterizations on lithium-ion batteries
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作者 Yihang Liu Qiuyun Li Ziqiang Wang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2024年第8期39-56,I0002,共19页
With the rapid development of portable electronics,new energy vehicles,and smart grids,ion batteries are becoming one of the most widely used energy storage devices,while the safety concern of ion batteries has always... With the rapid development of portable electronics,new energy vehicles,and smart grids,ion batteries are becoming one of the most widely used energy storage devices,while the safety concern of ion batteries has always been an urgent problem to be solved.To develop a safety-guaranteed battery,the characterization of the internal structure is indispensable,where electron microscopy plays a crucial role.Based on this,this paper summarizes the application of transmission electron microscopy(TEM)in battery safety,further concludes and analyzes the aspects of dendrite growth and solid electrolyte interface(SEI)formation that affect the safety of ion batteries,and emphasizes the importance of electron microscopy in battery safety research and the potential of these techniques to promote the future development of this field.These advanced electron microscopy techniques and their prospects are also discussed. 展开更多
关键词 electron microscopy characterizations Lithium-ion batteries DENDRITES SEI
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Characterization of local chemical ordering and deformation behavior in high entropy alloys by transmission electron microscopy
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作者 Qiuhong Liu Qing Du +7 位作者 Xiaobin Zhang Yuan Wu Andrey A.Rempel Xiangyang Peng Xiongjun Liu Hui Wang Wenli Song Zhaoping Lü 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2024年第5期877-886,共10页
Short-range ordering(SRO)is one of the most important structural features of high entropy alloys(HEAs).However,the chemical and structural analyses of SROs are very difficult due to their small size,complexed composit... Short-range ordering(SRO)is one of the most important structural features of high entropy alloys(HEAs).However,the chemical and structural analyses of SROs are very difficult due to their small size,complexed compositions,and varied locations.Transmission electron microscopy(TEM)as well as its aberration correction techniques are powerful for characterizing SROs in these compositionally complex alloys.In this short communication,we summarized recent progresses regarding characterization of SROs using TEM in the field of HEAs.By using advanced TEM techniques,not only the existence of SROs was confirmed,but also the effect of SROs on the deformation mechanism was clarified.Moreover,the perspective related to application of TEM techniques in HEAs are also discussed. 展开更多
关键词 high entropy alloys transmission electron microscopy short-range ordering deformation mechanisms
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Capturing the non-equilibrium state in light–matter–free-electron interactions through ultrafast transmission electron microscopy
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作者 汪文韬 孙帅帅 +5 位作者 李俊 郑丁国 黄思远 田焕芳 杨槐馨 李建奇 《Chinese Physics B》 SCIE EI CAS CSCD 2024年第1期88-101,共14页
Ultrafast transmission electron microscope(UTEM) with the multimodality of time-resolved diffraction, imaging,and spectroscopy provides a unique platform to reveal the fundamental features associated with the interact... Ultrafast transmission electron microscope(UTEM) with the multimodality of time-resolved diffraction, imaging,and spectroscopy provides a unique platform to reveal the fundamental features associated with the interaction between free electrons and matter. In this review, we summarize the principles, instrumentation, and recent developments of the UTEM and its applications in capturing dynamic processes and non-equilibrium transient states. The combination of the transmission electron microscope with a femtosecond laser via the pump–probe method guarantees the high spatiotemporal resolution, allowing the investigation of the transient process in real, reciprocal and energy spaces. Ultrafast structural dynamics can be studied by diffraction and imaging methods, revealing the coherent acoustic phonon generation and photoinduced phase transition process. In the energy dimension, time-resolved electron energy-loss spectroscopy enables the examination of the intrinsic electronic dynamics of materials, while the photon-induced near-field electron microscopy extends the application of the UTEM to the imaging of optical near fields with high real-space resolution. It is noted that light–free-electron interactions have the ability to shape electron wave packets in both longitudinal and transverse directions, showing the potential application in the generation of attosecond electron pulses and vortex electron beams. 展开更多
关键词 ultrafast transmission electron microscopy non-equilibrium structural dynamics photo-induced phase transition free-electron–photon interactions
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Scanning Electron Microscopy of Antennae of Aphidoletes aphidimyza (Diptera: Cecidomyiidae) 被引量:6
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作者 张洁 杨茂发 《Zoological Research》 CAS CSCD 北大核心 2008年第1期108-112,共5页
The morphology of antennae of Aphidoletes aphidimyza was observed with a scanning electron microscope. The results showed that both male and female were fourteen segmented, the male was approximately 2000 μm and the ... The morphology of antennae of Aphidoletes aphidimyza was observed with a scanning electron microscope. The results showed that both male and female were fourteen segmented, the male was approximately 2000 μm and the female was 1050μm. Six types of sensillae on the antenna were observed, viz. chaetica (Ch), trichoidea (Tr), basiconica (Ba), cavity (Ca), styloid (St) and circumfila (Ci) on the antennae of A. aphidimyza. Sensillae Ch had a long external-process, with a base surrounded by membranous sockets and a length of about 67.5 μm. Sensillae Tr were distally curved and inserted into a depression, 61.0μm long. Sensillae Ba were peg-like and 4.7μm long on the antennae. Sensillae Ca were pit-like in appearance and the diameter of the pit was 1.2μm. Sensilla St was found on the second sub-segment flagellum of the male antennae. The length of the sensilla was about 21 μm and the diameter was 1.5μm. The circurnfila, which are a unique type of sensilla found only on cecidomyiid antennae, formed loops around each of the antennal sub-segments, and were attached to the surface by a series of stalks. Sensilla St was only present on male antenna. The number of Ba and Tr was almost the same in both sexes. There were more Sensilla Ca on the male antenna than on the female, while there was more Ch on the female. 展开更多
关键词 Aphidoletes aphidimyza Scanning electron microscopy ANTENNA Sensillae ULTRASTRUCTURE
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Recent progress on advanced transmission electron microscopy characterization for halide perovskite semiconductors 被引量:1
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作者 Xiaomei Wu Xiaoxing Ke Manling Sui 《Journal of Semiconductors》 EI CAS CSCD 2022年第4期67-81,共15页
Halide perovskites are strategically important in the field of energy materials. Along with the rapid development of the materials and related devices, there is an urgent need to understand the structure–property rel... Halide perovskites are strategically important in the field of energy materials. Along with the rapid development of the materials and related devices, there is an urgent need to understand the structure–property relationship from nanoscale to atomic scale. Much effort has been made in the past few years to overcome the difficulty of imaging limited by electron dose,and to further extend the investigation towards operando conditions. This review is dedicated to recent studies of advanced transmission electron microscopy(TEM) characterizations for halide perovskites. The irradiation damage caused by the interaction of electron beams and perovskites under conventional imaging conditions are first summarized and discussed. Low-dose TEM is then discussed, including electron diffraction and emerging techniques for high-resolution TEM(HRTEM) imaging. Atomic-resolution imaging, defects identification and chemical mapping on halide perovskites are reviewed. Cryo-TEM for halide perovskites is discussed, since it can readily suppress irradiation damage and has been rapidly developed in the past few years. Finally, the applications of in-situ TEM in the degradation study of perovskites under environmental conditions such as heating,biasing, light illumination and humidity are reviewed. More applications of emerging TEM characterizations are foreseen in the coming future, unveiling the structural origin of halide perovskite’s unique properties and degradation mechanism under operando conditions, so to assist the design of a more efficient and robust energy material. 展开更多
关键词 organic–inorganic hybrid perovskite solar cell materials energy materials scanning electron microscopy transmission electron microscopy irradiation damage
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A Higher Plant Myosin in Luffa cylindrica: Electron Microscopic Visualization
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作者 赵发清 阎隆飞 《Acta Botanica Sinica》 CSCD 2002年第1期22-28,共7页
The molecular structure of a higher plant myosin with two 174 kD heavy chains purified from the tendrils of Luffa cylindrica (L.) Roem. was viewed by electron microscopy. The myosin exhibited actin_activated MgATP... The molecular structure of a higher plant myosin with two 174 kD heavy chains purified from the tendrils of Luffa cylindrica (L.) Roem. was viewed by electron microscopy. The myosin exhibited actin_activated MgATPase activity and could be recognized immunologically by a monoclonal antibody against the skeletal muscle myosin. Electron micrographs of rotary shadowed images of this protein revealed that it had two heads with size and shape similar to those of the skeletal muscle myosin and a relatively short tail in comparison with the conventional myosin. Luffa tendril actin filaments were also visualized and occasionally other Luffa myosin_like proteins with globular structure at the tail ends were also observed. The structural similarity and immunological cross reactivity with antibodies against muscle myosin demonstrate that the 174 kD Luffa tendril myosin is a double_headed myosin. The possible involvement of myosin_actin interactions in Luffa tendril contact coiling will be the subject of further research. 展开更多
关键词 MYOSIN STRUCTURE electron microscopy PURIFICATION Luffa cylindrica
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Mssbauer and electron microscopy study of martensitic transformations in an Fe-Mn-Mo alloy
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作者 T.Kirindi U.Sari M.Kurt 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2010年第4期448-452,共5页
The kinetic,morphological,crystallographic,and magnetic characteristics of thermally induced martensites in Fe-13.4wt% Mn-5.2wt%Mo alloy were investigated by scanning electron microscopy(SEM),transmission electron m... The kinetic,morphological,crystallographic,and magnetic characteristics of thermally induced martensites in Fe-13.4wt% Mn-5.2wt%Mo alloy were investigated by scanning electron microscopy(SEM),transmission electron microscopy(TEM),and M(o|¨)ssbauer spectroscopy.The experimental results reveal that two types of thermal-induced martensites,e(hcp) andα'(bcc) martensites,are formed in the as-quenched condition,and these transformations have athermal characters.Mo addition to the Fe-Mn alloy does not change the coexistence ofεandα' martensites with the Mn content between 10wt%and 15wt%.Besides,M(o|¨)ssbauer spectra reveal a paramagnetic character with a singlet for theγ(fcc) austenite andεmartensite phases and a ferromagnetic character with a broad sextet for theα' martensite phase. The volume fraction ofα' martensite forming in the quenched alloy is much more than that of theεmartensite. 展开更多
关键词 Fe-Mn alloy MOLYBDENUM martensitic transformation scanning electron microscopy(SEM) transmission electron microscopy(TEM) Mossbauer spectroscopy
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AN ENZYMOCYTOCHEMICAL STUDY OF ALKALINE PHOSPHATASE ISOENZYMES IN GASTRIC CANCER-LIGHT AND ELECTRON MICROSCOPIC OBSERVATIONS
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作者 苏英豪 杨光霖 +3 位作者 董聿明 张红 吴继锋 王道斌 《Chinese Journal of Cancer Research》 SCIE CAS CSCD 1995年第2期141-147,共7页
By using light and electron microscopic cytochemical technique, the activities and distributions of AP isoenzymes in gastric cancers and benign gastric diseases were examined.The results showed: Nagao, Regan and Kasah... By using light and electron microscopic cytochemical technique, the activities and distributions of AP isoenzymes in gastric cancers and benign gastric diseases were examined.The results showed: Nagao, Regan and Kasahara isoenzymes, which were not expressed in normal gastric mucosae and non-malignant lesions, might be considered as tumor markers of gastric cancer;The epithelium of intestinal metaplasia exhibited intestinal-type AP only,which was one of the markers of well-differentiated intestinal metaplasia.In the view-point of the gene expression of AP isoenzymes, two mutation hypothesis and recessive-gene mutation hypothesis might be fit for gastric cancer. 展开更多
关键词 Alkaline phospbatase isoenzymes Gastric cancer CYTOCHEMISTRY Light microscopy electron microscopy.
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Application of electron microscopy in gastroenterology
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作者 Masaya Iwamuro Haruo Urata +1 位作者 Takehiro Tanaka Hiroyuki Okada 《World Journal of Gastrointestinal Pathophysiology》 2022年第2期41-49,共9页
Electron microscopy has long been used in research in the fields of life sciences and materials sciences.Transmission and scanning electron microscopy and energy-dispersive X-ray spectroscopy(EDX)analyses have also be... Electron microscopy has long been used in research in the fields of life sciences and materials sciences.Transmission and scanning electron microscopy and energy-dispersive X-ray spectroscopy(EDX)analyses have also been performed in the field of gastroenterology.Electron microscopy and EDX enable(1)Observation of ultrastructural differences in esophageal epithelial cells in patients with gastroesophageal reflux and eosinophilic esophagitis;(2)Detection of lanthanum deposition in the stomach and duodenum;(3)Ultrastructural and elemental analyses of enteroliths and bezoars;(4)Detection and characterization of microorganisms in the gastrointestinal tract;(5)Diagnosis of gastrointestinal tumors with neuroendocrine differentiation;and(6)Analysis of gold nanoparticles potentially used in endoscopic photodynamic therapy.This review aims to foster a better understanding of electron microscopy applications by reviewing relevant clinical studies,basic research findings,and the state of current research carried out in gastroenterology science. 展开更多
关键词 Transmission electron microscopy Scanning electron microscopy Energydispersive X-ray spectrometry Gastrointestinal disease gastroesophageal reflux disease PATHOGENS
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18,X,Y aneuploidies and transmission electron microscopy studies in spermatozoa from five carriers of different reciprocal translocations 被引量:4
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作者 Elena Moretti Nicola Antonio Pascarelli +3 位作者 Valentina Giannerini Michela Geminiani Cecilia Anichini Giulia Collodel 《Asian Journal of Andrology》 SCIE CAS CSCD 2009年第3期325-332,共8页
We analysed ejaculated spermatozoa from five infertile men with different balanced reciprocal translocations to contribute to the study of meiotic segregation of chromosomes 18, X and Y and also to evaluate sperm morp... We analysed ejaculated spermatozoa from five infertile men with different balanced reciprocal translocations to contribute to the study of meiotic segregation of chromosomes 18, X and Y and also to evaluate sperm morphology by transmission electron microscopy (TEM) analysis. Conventional lymphocyte karyotype analyses highlighted dif- ferent reciprocal balanced translocations: t(12; 13), t(4;9), t(X;8), t(8; 10) and t(3; 16). Semen analysis was performed by light and TEM. Fluorescence in situ hybridization was performed directly on sperm nuclei using centromeric probes for chromosomes 18, X and Y. The carriers of the balanced reciprocal translocations considered in the present study showed a very similar pattern of sperm pathologies: diffused presence of apoptosis and immaturity. All patients showed meiotic segregation derangements, highlighted by the presence of sperm diploidies and sex chromosome disomies particularly related to the failure of the first meiotic division. However, an increased incidence of chromosome 18 aneuploidy was detected in spermatozoa from t(X;8) and t(8;10) carriers. We have also reported values from sex chromosomes such as t(X;8), although the X chromosome was involved in translocation. Since patients with reciprocal translocations and spermatogenetic impairment are candidates for intracytoplasmic sperm injection cycles, the study of sperm parameters, and particularly of the level of aneuploidy rates, would provide better information for couples at risk and would contribute to the data in the literature for a better understanding of the effects of chromosomal rearrangement on the whole meiotic process and, in particular, on chromosomes not involved in translocation. 展开更多
关键词 electron microscopy fluorescence in situ hybridization altered karyotype SPERMATOZOA reciprocal translocation
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A transmission electron microscopy study of the diversity of Candida albicans cells induced by Euphorbia hirta L.leaf extract in vitro 被引量:3
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作者 Abu Arra Basma Zakaria Zuraini Sreenivasan Sasidharan 《Asian Pacific Journal of Tropical Biomedicine》 SCIE CAS 2011年第1期20-22,共3页
Objective:To determine the major changes in the microstructure of Candida albicans(C. albicans) after treatment with Euphorbia hirta(E.hirta) L.leaf extract.Methods:Transmission electron microscopy was used to study t... Objective:To determine the major changes in the microstructure of Candida albicans(C. albicans) after treatment with Euphorbia hirta(E.hirta) L.leaf extract.Methods:Transmission electron microscopy was used to study the ultrastructural changes caused by E.hirta extract on C. albicans cells al various exposure time.Results:It was found that the main abnormalities were the alterations in morphology,lysis and complete collapse of the yeast cells after 36 h of exposure to the extract.Whereas the control cultures showed a typical morphology of Candida with a uniform central density,typically structured nucleus,and a cytoplasm with several elements of endomembrane system and enveloped by a regular,intact cell wall.Conclusions:The significant antifungal activity shown by this methanol extract of E.hirta L.suggests its potential against infections caused by C.albicans.The extract may be developed as an anticandidal agent. 展开更多
关键词 CANDIDA ALBICANS EUPHORBIA hirta L. Transmission electron microscopy Anticandidal agent
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Use of electron microscopy on microstructure characterization of high chromium cast irons 被引量:7
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作者 J.T.H. Pearce T. Chairuangsri +2 位作者 A. Wiengmoon N. Poolthong H. Nomura 《China Foundry》 SCIE CAS 2007年第1期38-43,共6页
The physical metallurgy underlying the development of cast microstructures in abrasion resistant high chromium cast irons, and their structural modification by thermal treatments is relatively complex. Structural char... The physical metallurgy underlying the development of cast microstructures in abrasion resistant high chromium cast irons, and their structural modification by thermal treatments is relatively complex. Structural characterisation via electron microscopy therefore has a key role to play in furthering our understanding of the phase transformations that control the microstructures and hence the service performances of these irons as wear parts. This paper shows how both scanning and especially transmission electron microscopy can provide valuable information on the nature of eutectic and secondary carbides and on the matrix structures in these irons. Particular attention is given to current characterisation research on conventionally cast 30%Cr irons that are used for applications involving corrosive wear e.g. slurry pumps and on a semi-solid cast 27%Cr iron that has a potential for applications in industry. 展开更多
关键词 high chromium cast iron electron microscopy MICROSTRUCTURE CHARACTERIZATION
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L-carnitine alleviates sciatic nerve crush injury in rats:functional and electron microscopy assessments 被引量:3
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作者 ümmü Zeynep Avsar Umit Avsar +5 位作者 Ali Aydin Muhammed Yayla Berna Ozturkkaragoz Harun Un Murat Saritemur Tolga Mercantepe 《Neural Regeneration Research》 SCIE CAS CSCD 2014年第10期1020-1024,共5页
Several studies have demonstrated that L-carnitine exhibits neuroprotective effects on injured sciatic nerve of rats with diabetes mellitus. It is hypothesized that L-carnitine exhibits neuro-protective effects on inj... Several studies have demonstrated that L-carnitine exhibits neuroprotective effects on injured sciatic nerve of rats with diabetes mellitus. It is hypothesized that L-carnitine exhibits neuro-protective effects on injured sciatic nerve of rats. Rat sciatic nerve was crush injured by a forceps and exhibited degenerative changes. After intragastric administration of 50 and 100 mg/kg L-carnitine for 30 days, axon area, myelin sheath area, axon diameter, myelin sheath diameter, and numerical density of the myelinated axons of injured sciatic nerve were similar to normal, and the function of injured sciatic nerve also improved signiifcantly. These ifndings suggest that L-carnitine exhibits neuroprotective effects on sciatic nerve crush injury in rats. 展开更多
关键词 nerve regeneration peripheral nerve injury sciatic nerve L-CARNITINE NEUROPROTECTION crush injury electron microscopy AXON myelin sheath neural regeneration
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CHARACTERIZATION OF NANOSTRUCTURED MATERIALS BY ANALYTICAL ELECTRON MICROSCOPY 被引量:2
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作者 L.D. He,G.Y Zeng,X.Liu H.S. Hu,D.Song and L.Z.Cheng(Electron Microscope Laboratory Northeastern University Shenyang 110006, China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1996年第4期279-282,共4页
The analytical electron microscopy has been used to characterize the morphology,structure and composition of the nanostructured material of Sn- Bi alloy prepared by a modified electrohydrodynamic technique. The electr... The analytical electron microscopy has been used to characterize the morphology,structure and composition of the nanostructured material of Sn- Bi alloy prepared by a modified electrohydrodynamic technique. The electron diffraction pattern and the corresponding contrast image for the discrete particles with a diameter smaller than 4 nm have been obtained.It is shown that the nanocrystalline Sn-Bi alloy particles comprise a single crystal of Bi-containing β-Sn solid solution or of Sn-containing Bi solid solution. A direct preparation procedure of the samples during the electrohydrodynamic rapid solidification process has been developed for electron microscopic observation. 展开更多
关键词 nanostructured material electrohydrodynamic technique analytical electron microscopy Sn-Bi alloy
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Transmission Electron Microscopy as a Powerful Tool for Investigating Lithium-ion Battery Materials 被引量:2
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作者 LIN Cong LI Jian-Yuan +1 位作者 WANG Chong-Min PAN Feng 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2019年第12期2015-2019,共5页
Transmission electron microscopy(TEM) stands out as one of the most powerful tools for characterizing materials at multiple scales and dimensions. This unique technique has nowadays been widely employed in investigati... Transmission electron microscopy(TEM) stands out as one of the most powerful tools for characterizing materials at multiple scales and dimensions. This unique technique has nowadays been widely employed in investigating the lithium-ion battery(LIB) materials. The present perspective paper focuses on several LIB related aspects that are recently revealed by using TEM. Finally, we present outlook on the future directions of TEM for LIB research and development. 展开更多
关键词 transmission electron microscopy lithium-ion batteries STRUCTURES PROPERTIES
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Scanning transmission electron microscopy: A review of high angle annular dark field and annular bright field imaging and applications in lithium-ion batteries 被引量:2
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作者 Yu-Xin Tong Qing-Hua Zhang Lin Gu 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第6期23-34,共12页
Scanning transmission electron microscopy(STEM) has been shown as powerful tools for material characterization,especially after the appearance of aberration-corrector which greatly enhances the resolution of STEM. H... Scanning transmission electron microscopy(STEM) has been shown as powerful tools for material characterization,especially after the appearance of aberration-corrector which greatly enhances the resolution of STEM. High angle annular dark field(HAADF) and annular bright field(ABF) imaging of the aberration-corrected STEM are widely used due to their high-resolution capabilities and easily interpretable image contrasts. However, HAADF mode of the STEM is still limited in detecting light elements due to the weak electron-scattering power. ABF mode of the STEM could detect light and heavy elements simultaneously, providing unprecedented opportunities for probing unknown structures of materials. Atomiclevel structure investigation of materials has been achieved by means of these imaging modes, which is invaluable in many fields for either improving properties of materials or developing new materials. This paper aims to provide a introduction of HAADF and ABF imaging techniques and reviews their applications in characterization of cathode materials, study of electrochemical reaction mechanisms, and exploring the effective design of lithium-ion batteries(LIBs). The future prospects of the STEM are also discussed. 展开更多
关键词 scanning transmission electron microscopy high angle annular dark field annular bright field lithium-ion batteries
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A review of in situ transmission electron microscopy study on the switching mechanism and packaging reliability in non-volatile memory 被引量:3
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作者 Xin Yang Chen Luo +7 位作者 Xiyue Tian Fang Liang Yin Xia Xinqian Chen Chaolun Wang Steve Xin Liang Xing Wu Junhao Chu 《Journal of Semiconductors》 EI CAS CSCD 2021年第1期62-76,共15页
Non-volatile memory(NVM)devices with non-volatility and low power consumption properties are important in the data storage field.The switching mechanism and packaging reliability issues in NVMs are of great research i... Non-volatile memory(NVM)devices with non-volatility and low power consumption properties are important in the data storage field.The switching mechanism and packaging reliability issues in NVMs are of great research interest.The switching process in NVM devices accompanied by the evolution of microstructure and composition is fast and subtle.Transmission electron microscopy(TEM)with high spatial resolution and versatile external fields is widely used in analyzing the evolution of morphology,structures and chemical compositions at atomic scale.The various external stimuli,such as thermal,electrical,mechanical,optical and magnetic fields,provide a platform to probe and engineer NVM devices inside TEM in real-time.Such advanced technologies make it possible for an in situ and interactive manipulation of NVM devices without sacrificing the resolution.This technology facilitates the exploration of the intrinsic structure-switching mechanism of NVMs and the reliability issues in the memory package.In this review,the evolution of the functional layers in NVM devices characterized by the advanced in situ TEM technology is introduced,with intermetallic compounds forming and degradation process investigated.The principles and challenges of TEM technology on NVM device study are also discussed. 展开更多
关键词 MEMORY transmission electron microscopy in situ characterization PACKAGE RELIABILITY
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