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Opportunities from energy-loss near-edge fine structure analysis to track chemical and structural damage in zircon 利用能量损失近边缘精细结构分析追踪锆石化学和结构损伤的机会。
IF 2.2 3区 工程技术
Micron Pub Date : 2026-01-01 Epub Date: 2025-10-10 DOI: 10.1016/j.micron.2025.103928
M. Bugnet , P.-M. Zanetta , S. Sao Joao , A.-M. Seydoux-Guillaume , E. Balan , G.A. Botton , D. Cabaret , G. Radtke
{"title":"Opportunities from energy-loss near-edge fine structure analysis to track chemical and structural damage in zircon","authors":"M. Bugnet ,&nbsp;P.-M. Zanetta ,&nbsp;S. Sao Joao ,&nbsp;A.-M. Seydoux-Guillaume ,&nbsp;E. Balan ,&nbsp;G.A. Botton ,&nbsp;D. Cabaret ,&nbsp;G. Radtke","doi":"10.1016/j.micron.2025.103928","DOIUrl":"10.1016/j.micron.2025.103928","url":null,"abstract":"<div><div>Zircon (ZrSiO<sub>4</sub>) is the oldest-known mineral of Earth and an ubiquitous silicate in geochronology. More specifically, the accumulation of alpha decay damage in zircon over time significantly affects its physical and chemical properties, and can lead to a disturbance of the ages measured in this mineral. Therefore, analytical tools that enable comprehensive structural and chemical information at the nanoscale in this compound are highly sought after. In this context, we explore the electron energy-loss fine structures resulting from the excitation of O<!--> <!-->1<em>s</em> and Si<!--> <!-->2<em>p</em> core electrons in zircon, which are interpreted from <em>ab initio</em> calculations in a single-particle framework. An excellent agreement is obtained between the experimental and calculated fine structures, emphasizing the large distortion of the final electronic states induced by the core-hole potential. The O-K edge is particularly rich in information, with intense peaks dominated by O<!--> <span><math><mrow><mn>2</mn><mi>p</mi></mrow></math></span> - Zr<!--> <span><math><mrow><mn>4</mn><mi>d</mi></mrow></math></span> and O<!--> <span><math><mrow><mn>2</mn><mi>p</mi></mrow></math></span> - Si<!--> <span><math><mrow><mn>3</mn><mi>s</mi><mi>p</mi></mrow></math></span> hybrids. This work suggests that the near-edge structures from the O<!--> <span><math><mrow><mn>1</mn><mi>s</mi></mrow></math></span> and Si<!--> <span><math><mrow><mn>2</mn><mi>p</mi></mrow></math></span> excitations accessible from electron energy-loss spectroscopy or X-ray absorption spectroscopy could be used as tools to follow, interpret and understand structural and chemical modifications in zircon subject to natural radiation damage. We illustrate the potential of this approach through the evolution of near-edge fine structures in a zircon sample that exhibits a locally amorphized zone formed by ultrafast laser excitation.</div></div>","PeriodicalId":18501,"journal":{"name":"Micron","volume":"200 ","pages":"Article 103928"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145308519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Thymol enhances the acaricidal effects of cypermethrin through the disruption of oocyte development in Rhipicephalus microplus (Acari: Ixodidae) 百里香酚通过破坏微小蜱螨的卵母细胞发育来增强氯氰菊酯的杀螨效果。
IF 2.2 3区 工程技术
Micron Pub Date : 2026-01-01 Epub Date: 2025-10-15 DOI: 10.1016/j.micron.2025.103940
Matheus Nobate-Gomes , Patrícia Rosa de Oliveira , Isabella Chaves Sousa , Dauana Mesquita-Sousa , Tássia Lopes do Vale , Olga Oliveira dos Anjos , Caio Marcio Oliveira Monteiro , Livio Martins Costa Junior , Caio Pavão Tavares
{"title":"Thymol enhances the acaricidal effects of cypermethrin through the disruption of oocyte development in Rhipicephalus microplus (Acari: Ixodidae)","authors":"Matheus Nobate-Gomes ,&nbsp;Patrícia Rosa de Oliveira ,&nbsp;Isabella Chaves Sousa ,&nbsp;Dauana Mesquita-Sousa ,&nbsp;Tássia Lopes do Vale ,&nbsp;Olga Oliveira dos Anjos ,&nbsp;Caio Marcio Oliveira Monteiro ,&nbsp;Livio Martins Costa Junior ,&nbsp;Caio Pavão Tavares","doi":"10.1016/j.micron.2025.103940","DOIUrl":"10.1016/j.micron.2025.103940","url":null,"abstract":"<div><div>The cattle tick <em>Rhipicephalus microplus</em> is one of the most important ectoparasites in tropical and subtropical regions. Synthetic pyrethroids are widely used to control this tick, although the selection of resistant populations is a worldwide concern. Thymol, a natural monoterpene, alone or combined with other compounds, has shown efficacy against tick species. In <em>R. microplus</em> engorged females, thymol increases cypermethrin concentration in various tissues by enhancing its penetration at the cuticular level. Data on internal organ histopathological changes from the thymol–cypermethrin combination remain limited in different <em>R. microplus</em> populations. This study evaluated the combined effects of cypermethrin and thymol on ovarian morphology of engorged females from two populations with low or high susceptibility to cypermethrin. Combinations of cypermethrin at different concentrations with a fixed thymol concentration (1.3 mg/mL) were tested. Eight treatment groups (n = 20 engorged females) were tested, including cypermethrin alone, thymol alone, and combinations. Ovarian changes induced by the combination were more pronounced than those caused by either compound alone, suggesting a synergistic effect. The main alterations in oocytes II–V included large peripheral vacuoles, reduced yolk granules, altered oocyte shape, chorion irregularities, and fragmented yolk granules, resulting in incomplete vitellogenesis. These findings provide histological evidence that thymol enhances cypermethrin efficacy by impairing ovarian development, supporting its potential as an adjuvant in tick control strategies.</div></div>","PeriodicalId":18501,"journal":{"name":"Micron","volume":"200 ","pages":"Article 103940"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145318567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Scratch-induced microstructure of Ni single crystal: A FIB-TEM study Ni单晶划痕诱导微观结构的FIB-TEM研究
IF 2.2 3区 工程技术
Micron Pub Date : 2026-01-01 Epub Date: 2025-09-24 DOI: 10.1016/j.micron.2025.103919
Chenbang Zhu, Ying Chen, Keduo Xia, Liankui Wu, Fahe Cao, Qingqing Sun
{"title":"Scratch-induced microstructure of Ni single crystal: A FIB-TEM study","authors":"Chenbang Zhu,&nbsp;Ying Chen,&nbsp;Keduo Xia,&nbsp;Liankui Wu,&nbsp;Fahe Cao,&nbsp;Qingqing Sun","doi":"10.1016/j.micron.2025.103919","DOIUrl":"10.1016/j.micron.2025.103919","url":null,"abstract":"<div><div>Revealing the scratch-induced microstructural evolution of metals is important to establish the mechanism and model of wear and/or tribology. In this work, substructure evolution of the region between scratch track and the unaffected metal of Ni single crystal was fully characterized by using advanced electron microscopy techniques such as FIB, TEM and TKD. A 30 μm × 30 μm electron transparent foil at the area of interest was fabricated by FIB technique. Four ‌characteristic substructures are identified as approaching to the scratch track direction: Area I predominantly contains dislocation cells and dislocation tangles; Area II features refined dislocation cells and cell blocks; Area III comprises ultrafine grains (UFG); Area IV consists of nanolaminates (NL). This work provides key experimental basis for relevant simulations in the field of friction and wear.</div></div>","PeriodicalId":18501,"journal":{"name":"Micron","volume":"200 ","pages":"Article 103919"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145134864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Temperature-dependent microstructural evolution and phase transformation mechanism of LiNbO3 bicrystal interfaces LiNbO3双晶界面温度相关的微观结构演化及相变机制。
IF 2.2 3区 工程技术
Micron Pub Date : 2026-01-01 Epub Date: 2025-10-11 DOI: 10.1016/j.micron.2025.103937
Kailin Chen , Xuexi Yan , Hao Wang , Min Tian , Xi Cao , Xiang Li , Tingting Yao , Yixiao Jiang , Zhiqing Yang , Hengqiang Ye , Chunlin Chen
{"title":"Temperature-dependent microstructural evolution and phase transformation mechanism of LiNbO3 bicrystal interfaces","authors":"Kailin Chen ,&nbsp;Xuexi Yan ,&nbsp;Hao Wang ,&nbsp;Min Tian ,&nbsp;Xi Cao ,&nbsp;Xiang Li ,&nbsp;Tingting Yao ,&nbsp;Yixiao Jiang ,&nbsp;Zhiqing Yang ,&nbsp;Hengqiang Ye ,&nbsp;Chunlin Chen","doi":"10.1016/j.micron.2025.103937","DOIUrl":"10.1016/j.micron.2025.103937","url":null,"abstract":"<div><div>Lithium niobate (LiNbO<sub>3</sub>), with its superior chemical inertness, intrinsic strong optical nonlinearity, and electro-optic coupling, serves as a core functional material in optoelectronic integrated devices, optical fiber communication systems, acousto-optic modulation components, and surface acoustic wave devices in the interdisciplinary field of condensed matter physics and optoelectronic engineering. However, the excellent properties of LiNbO<sub>3</sub> are intimately associated with its phase structure. Here, LiNbO<sub>3</sub> bicrystals were fabricated by the thermal diffusion bonding method at different temperatures. The atomic structure and phase transition of the LiNbO<sub>3</sub> at the bicrystal interfaces were characterized using aberration-corrected transmission electron microscopy. It was found that when the sintering temperature was lower than 700 ℃, the LiNb<sub>3</sub>O<sub>8</sub> phase would be formed at the interface of LiNbO<sub>3</sub>. As the temperature increased, the LiNb<sub>3</sub>O<sub>8</sub> phase gradually grew along the interface and connected to a thin layer. When the temperature was higher than 900 ℃, the LiNb<sub>3</sub>O<sub>8</sub> phase on the interface disappears. The two LiNbO<sub>3</sub> substrates were sintered into a perfect single crystal. According to the Nb<sub>2</sub>O<sub>5</sub>-Li<sub>2</sub>O equilibrium phase diagram, the generation of LiNb<sub>3</sub>O<sub>8</sub> phase is mainly caused by the volatilization of Li<sub>2</sub>O on the interface during low-temperature sintering. When the sintering temperature increases, the Li<sub>2</sub>O in the bulk quickly replenishes to the interface, and the interface is transformed into the normal LiNbO<sub>3</sub> phase. Our findings provide guidance for the stable preparation of high-performance optoelectronic devices based on LiNbO<sub>3</sub>. Our findings shed light on the regulation of LiNbO<sub>3</sub> phase structure.</div></div>","PeriodicalId":18501,"journal":{"name":"Micron","volume":"200 ","pages":"Article 103937"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145313354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Advancing time-resolved spectroscopies with custom scanning units and event-based electron detection 推进时间分辨光谱与自定义扫描单元和基于事件的电子检测。
IF 2.2 3区 工程技术
Micron Pub Date : 2026-01-01 Epub Date: 2025-10-10 DOI: 10.1016/j.micron.2025.103925
Yves Auad , Florian Castioni , Jassem Baaboura , Malo Bézard , Jean-Denis Blazit , Xiaoyan Li , Adrien Teutrie , Michael Walls , Odile Stéphan , Luiz H.G. Tizei , Francisco de La Peña , Mathieu Kociak
{"title":"Advancing time-resolved spectroscopies with custom scanning units and event-based electron detection","authors":"Yves Auad ,&nbsp;Florian Castioni ,&nbsp;Jassem Baaboura ,&nbsp;Malo Bézard ,&nbsp;Jean-Denis Blazit ,&nbsp;Xiaoyan Li ,&nbsp;Adrien Teutrie ,&nbsp;Michael Walls ,&nbsp;Odile Stéphan ,&nbsp;Luiz H.G. Tizei ,&nbsp;Francisco de La Peña ,&nbsp;Mathieu Kociak","doi":"10.1016/j.micron.2025.103925","DOIUrl":"10.1016/j.micron.2025.103925","url":null,"abstract":"<div><div>Direct electron detection is revolutionizing electron microscopy by offering lower noise, reduced point-spread function, and increased quantum efficiency. Among these advancements, the Timepix3 hybrid-pixel direct electron detector stands out for its unique ability to output temporal information about individual hits within its pixel array. Its event-based architecture enables data-driven detection, where individual events are immediately read out from the chip. While recent studies have demonstrated the potential of event-based detectors in various applications in the context of continuous-gun scanning transmission electron microscopes (STEM), the use of such detectors with standard scanning units remains underdeveloped. In this work, we present a custom-designed, Timepix3-compatible scanning unit specifically developed to leverage the advantages of event-based detection. We explore its performance in enabling spatially and temporally resolved experiments, as well as its seamless interfacing with other time-resolved instruments, such as pulsed lasers and electron beam blankers. Additionally, we examine the prospects for achieving enhanced temporal resolution in time-resolved experiments using continuous-gun electron microscopes, identifying key challenges and proposing solutions to improve performance. This combination of custom hardware with advanced detection technology promises to expand the capabilities of electron microscopy in both fundamental research and practical applications.</div></div>","PeriodicalId":18501,"journal":{"name":"Micron","volume":"200 ","pages":"Article 103925"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145313308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Validation, application, and practical use of the origami-based Foldscope microscope for biomonitoring soil and litter arthropods 基于折纸的折叠显微镜在土壤和凋落物节肢动物生物监测中的验证、应用和实际应用
IF 2.2 3区 工程技术
Micron Pub Date : 2026-01-01 Epub Date: 2025-09-27 DOI: 10.1016/j.micron.2025.103920
Sonar Indira , Chettri Arati , Dorshon Chakravarty Mimangsha , Abdelgani Gumaa Abdelmuala Baraka , Ahmed-Laskar Saeed , Malik Smita Shruti , Rabha Chiranjeeb , Chakma Sonia , Maurya Khushboo , Lalremruata Andy , Vikas Kumar Roy , Nachimuthu Senthil Kumar , Guruswami Gurusubramanian
{"title":"Validation, application, and practical use of the origami-based Foldscope microscope for biomonitoring soil and litter arthropods","authors":"Sonar Indira ,&nbsp;Chettri Arati ,&nbsp;Dorshon Chakravarty Mimangsha ,&nbsp;Abdelgani Gumaa Abdelmuala Baraka ,&nbsp;Ahmed-Laskar Saeed ,&nbsp;Malik Smita Shruti ,&nbsp;Rabha Chiranjeeb ,&nbsp;Chakma Sonia ,&nbsp;Maurya Khushboo ,&nbsp;Lalremruata Andy ,&nbsp;Vikas Kumar Roy ,&nbsp;Nachimuthu Senthil Kumar ,&nbsp;Guruswami Gurusubramanian","doi":"10.1016/j.micron.2025.103920","DOIUrl":"10.1016/j.micron.2025.103920","url":null,"abstract":"<div><div>The purpose of this study was to evaluate the potential of the origami-based Foldscope microscope, supplemented with smartphone cameras, as a practical, affordable, and field-ready tool for monitoring soil and litter arthropod diversity in tropical forest ecosystems of Mizoram, India (Aizawl, Lunglei, and Mamit). We surveyed arthropod diversity across multiple taxa—including Protura, Diplura, Collembola, Orthoptera, Coleoptera, Hymenoptera, Diptera, Araneae, and others—and compared image quality with conventional student microscopes. We hypothesized that the Foldscope, when coupled with smartphone imaging, would generate diagnostically useful images of soil and litter arthropods comparable to those obtained with conventional microscopes, thereby serving as a practical tool for biodiversity monitoring in field conditions. To test this, our objectives were: (i) to survey soil and litter arthropod diversity in three tropical forest regions using Foldscope; (ii) to compare its imaging performance with conventional microscopes; and (iii) to examine the broader implications of low-cost, field-based microscopy for biodiversity monitoring and scientific equity. Our results demonstrate that the Foldscope reliably produced diagnostically useful images of key soil and litter arthropod groups under natural field conditions, underscoring its utility as a low-cost, portable alternative to conventional laboratory instruments. Beyond documenting biodiversity patterns, this study highlights the role of accessible instrumentation in advancing ecological research and education. In resource-constrained contexts, the scarcity of laboratory-grade microscopes often limits opportunities for field-based inquiry. By enabling in situ collection and analysis, the Foldscope lowers barriers to participation in biodiversity monitoring, environmental education, and citizen science. We further argue that this work underscores the responsibility of instrument developers to address the needs of under-resourced scientific communities. Foldscope’s adoption, compared with other open-source platforms such as UC2 and OpenFlexure, illustrates the importance of intuitive design, compatibility with digital tools, and potential integration with open-source artificial intelligence for image analysis. By presenting this work as both a validation study and a perspective from a resource-limited research setting, we establish Foldscope not only as a validated tool for ecological monitoring but also as a model of how affordable instruments can strengthen resource-limited research, bridge global inequities, and expand participation in biodiversity science.</div></div>","PeriodicalId":18501,"journal":{"name":"Micron","volume":"200 ","pages":"Article 103920"},"PeriodicalIF":2.2,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The analysis approach for high collection efficiency of secondary electron using Wien filter and in-lens collection system based on differential algebra method 基于微分代数方法的维恩滤光片和透镜内收集系统对二次电子高收集效率的分析方法
IF 2.2 3区 工程技术
Micron Pub Date : 2025-12-01 Epub Date: 2025-08-26 DOI: 10.1016/j.micron.2025.103909
Hangfeng Hu, Fu Liu, Jie Li, Yongfeng Kang
{"title":"The analysis approach for high collection efficiency of secondary electron using Wien filter and in-lens collection system based on differential algebra method","authors":"Hangfeng Hu,&nbsp;Fu Liu,&nbsp;Jie Li,&nbsp;Yongfeng Kang","doi":"10.1016/j.micron.2025.103909","DOIUrl":"10.1016/j.micron.2025.103909","url":null,"abstract":"<div><div>In this work, an analysis approach based on the differential algebra method is proposed to achieve high collection efficiency of secondary electron (SE) using Wien filter in retarding field SEM. In the approach, the influence of Wien filter on electron optical properties of primary electron (PE) is also comprehensively considered. Due to the unmatched fringe fields in Wien filter, the optical axis of primary electron will be deviated from the central axis, but it can be deflected back to the central axis again by the developed Wien condition. And the electron optical properties are calculated and analyzed referred to this curved optical axis. Then, based on the calculation results of SE at detector plane, the expressions about orientation angle and excitations of Wien filter for high SE collection efficiency are derived. By further considering the influence of Wien filter on electron optical properties of PE, the optimized orientation angle and excitations can be obtained. Taking a retarding field SEM with Wien filter as an example, high SE collection efficiency is achieved by optimizing the appropriate orientation angle and excitations of Wien filter, with the analysis of the proposed approach. Finally, experiments are carried out with varying excitations of the Wien filter, and the experimental results are well explained by the calculated current density distributions of SE and the electron optical properties of PE, which validates the proposed analysis approach.</div></div>","PeriodicalId":18501,"journal":{"name":"Micron","volume":"199 ","pages":"Article 103909"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144919846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Momentum-dispersion calibration and measurement of a surface layer dielectric constant using momentum-resolved electron energy-loss spectroscopy in the optical region 利用动量分辨电子能量损耗谱在光学区对表层介电常数进行动量色散校准和测量
IF 2.2 3区 工程技术
Micron Pub Date : 2025-12-01 Epub Date: 2025-09-08 DOI: 10.1016/j.micron.2025.103907
Misa Hayashida (林田美咲) , Makoto Tokoro Schreiber , Heiko Müller , Yoshifumi Taniguchi (谷口佳史) , John Canlas , Charles Soong , Kai Cui , Ray Egerton , Marek Malac
{"title":"Momentum-dispersion calibration and measurement of a surface layer dielectric constant using momentum-resolved electron energy-loss spectroscopy in the optical region","authors":"Misa Hayashida (林田美咲) ,&nbsp;Makoto Tokoro Schreiber ,&nbsp;Heiko Müller ,&nbsp;Yoshifumi Taniguchi (谷口佳史) ,&nbsp;John Canlas ,&nbsp;Charles Soong ,&nbsp;Kai Cui ,&nbsp;Ray Egerton ,&nbsp;Marek Malac","doi":"10.1016/j.micron.2025.103907","DOIUrl":"10.1016/j.micron.2025.103907","url":null,"abstract":"<div><div>Momentum-resolved electron energy loss spectroscopy (<span><math><mi>q</mi></math></span>EELS) in the low-loss (from 0 to <span><math><mo>≈</mo></math></span>10 eV) region provides means for measurement of sample optical properties at the nanoscale. When both energy loss <span><math><mrow><mi>Δ</mi><mi>E</mi><mo>=</mo><mo>ħ</mo><mi>ω</mi></mrow></math></span> and momentum transfer <span><math><mi>q</mi></math></span> are measured, the dispersion relation of surface-plasmon polaritons (SPP) can be studied. However, the momentum (<span><math><mi>q</mi></math></span>) dispersion calibration is challenging due to the small scattering angles involved, and the consequent lack of suitable calibration samples and methods. Here, we discuss how by fitting the experimental data to a simplified SPP dispersion formula, the momentum dispersion can be calibrated and the dielectric constant <span><math><msub><mrow><mi>ϵ</mi></mrow><mrow><mi>r</mi></mrow></msub></math></span> of a thin surface layer measured. The dielectric constant measured by SPP fitting is robust to small sample tilts and stays within <span><math><mo>±</mo></math></span>11% over a −6 ° to +13.3 ° sample tilt relative to the incident-beam direction. Methods such as electron diffraction and chemical mapping, can be applied to the same area as examined by <span><math><mi>q</mi></math></span>EELS, potentially providing insights in materials structure and composition with its optical properties.</div></div>","PeriodicalId":18501,"journal":{"name":"Micron","volume":"199 ","pages":"Article 103907"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145109631","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
In situ TEM and EELS analysis of Ni catalytic nanoparticles for dry reforming of methane Ni纳米颗粒催化甲烷干重整的原位TEM和EELS分析
IF 2.2 3区 工程技术
Micron Pub Date : 2025-12-01 Epub Date: 2025-08-12 DOI: 10.1016/j.micron.2025.103894
Yutain Han , Xiaobo Peng , Hideki Abe , Ayako Hashimoto
{"title":"In situ TEM and EELS analysis of Ni catalytic nanoparticles for dry reforming of methane","authors":"Yutain Han ,&nbsp;Xiaobo Peng ,&nbsp;Hideki Abe ,&nbsp;Ayako Hashimoto","doi":"10.1016/j.micron.2025.103894","DOIUrl":"10.1016/j.micron.2025.103894","url":null,"abstract":"<div><div>Dry reforming of methane (DRM, CH<sub>4</sub>+CO<sub>2</sub>→2CO+2H<sub>2</sub>) involves production of CO and H<sub>2</sub> using two kinds of greenhouse gases, CH<sub>4</sub> and CO<sub>2</sub>, without requiring an expensive and complicated gas separation process. Using a developed specimen holder, we observed the Ni nanoparticles on Al<sub>2</sub>O<sub>3</sub> supports during DRM catalysis through <em>in situ</em> transmission electron microscopy and electron energy loss spectroscopy by tracking each individual nanoparticle to elucidate the structural and chemical features of the working catalyst under practical conditions. The average value of the Ni L<sub>3</sub>/L<sub>2</sub> intensity ratio, which relates to the valence state (i.e., oxidation state), shows that the Ni nanoparticles were oxidized at 450 °C in the DRM gas and then slightly reduced at 650 °C as a whole. But the Ni nanoparticles actually exhibited a range of oxidation states under DRM conditions. In particular, some oxidized Ni nanoparticles were reduced at 550 °C and drastically changed in size, becoming much smaller. Compared with <em>in situ</em> observations under only CH<sub>4</sub> gas, without CO<sub>2</sub>, oxidation of the Ni surface was directly and locally observed, presumably due to the reaction with Al<sub>2</sub>O<sub>3</sub> and the decomposition of CO<sub>2</sub>. Additionally, the reduction of oxidized Ni was mainly due to hydrogen-containing gases. Furthermore, carbon deposition was observed at 350 °C, containing both amorphous carbon and graphene layers.</div></div>","PeriodicalId":18501,"journal":{"name":"Micron","volume":"199 ","pages":"Article 103894"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144852742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study of gas-based charge compensation in an open-cell environmental TEM by off-axis electron holography 用离轴电子全息技术研究开孔环境TEM中气基电荷补偿
IF 2.2 3区 工程技术
Micron Pub Date : 2025-12-01 Epub Date: 2025-08-19 DOI: 10.1016/j.micron.2025.103896
Makoto Tokoro Schreiber , Cathal Cassidy
{"title":"Study of gas-based charge compensation in an open-cell environmental TEM by off-axis electron holography","authors":"Makoto Tokoro Schreiber ,&nbsp;Cathal Cassidy","doi":"10.1016/j.micron.2025.103896","DOIUrl":"10.1016/j.micron.2025.103896","url":null,"abstract":"<div><div>Under electron bombardment, electrically insulating samples accumulate a net charge which can adversely affect measurements in electron microscopy. Here, we present a preliminary study on gas-based charge compensation in TEM quantified through off-axis electron holography. Based on the present data, it appears that the introduction of a gas flow reversibly reduces the degree of charge buildup and fluctuations on a dielectric sample. The use of gas may thus allow for the study of samples which would normally be strongly distorted, unstable, or damaged by the charging process; as well as further studies of the charging process itself. However, as the present results were obtained with low spatial resolution Lorentz optics and second-scale time resolutions, we caution that the effectiveness of gas-based charge compensation for high spatial and temporal resolutions is not yet demonstrated.</div></div>","PeriodicalId":18501,"journal":{"name":"Micron","volume":"199 ","pages":"Article 103896"},"PeriodicalIF":2.2,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144908393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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