{"title":"Electron Beam-Assisted Au Nanocrystal Shear and Rotation","authors":"Jiajian Guan, Wuxin Yang, Weidong Zhang, Wei Gao, Zhen He, Ziyun Wang","doi":"10.1021/acs.nanolett.4c05820","DOIUrl":null,"url":null,"abstract":"Understanding metastable structural transitions under beam irradiation is essential for the phase engineering of nanomaterials. However, in situ studies of beam-induced structural transitions remain challenging. This work uses an electron beam in aberration-corrected high-angle annular dark-field scanning transmission electron microscopy to irradiate Au nanocrystals at room temperature. The electron beam-induced thermal spike is estimated by electron energy loss spectroscopy and the two-temperature model. The thermal spike drives a transition in the Au lattice from nonclose-packed (311) and (220) planes to close-packed (111) planes through nonrandom lattice rotation. This transition is attributed to the gradient distribution of shear strain at the grain boundaries, with a critical shear strain of approximately 0.2 for the shift from the (220) to the (111) planes. These insights reveal the origins of nanocrystal shear and rotation under electron beam irradiation, providing strategies for precise nanocrystal manipulation using beam-assisted techniques.","PeriodicalId":53,"journal":{"name":"Nano Letters","volume":"180 1","pages":""},"PeriodicalIF":9.1000,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nano Letters","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1021/acs.nanolett.4c05820","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Understanding metastable structural transitions under beam irradiation is essential for the phase engineering of nanomaterials. However, in situ studies of beam-induced structural transitions remain challenging. This work uses an electron beam in aberration-corrected high-angle annular dark-field scanning transmission electron microscopy to irradiate Au nanocrystals at room temperature. The electron beam-induced thermal spike is estimated by electron energy loss spectroscopy and the two-temperature model. The thermal spike drives a transition in the Au lattice from nonclose-packed (311) and (220) planes to close-packed (111) planes through nonrandom lattice rotation. This transition is attributed to the gradient distribution of shear strain at the grain boundaries, with a critical shear strain of approximately 0.2 for the shift from the (220) to the (111) planes. These insights reveal the origins of nanocrystal shear and rotation under electron beam irradiation, providing strategies for precise nanocrystal manipulation using beam-assisted techniques.
期刊介绍：
Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including:
- Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale
- Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies
- Modeling and simulation of synthetic, assembly, and interaction processes
- Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance
- Applications of nanoscale materials in living and environmental systems
Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.
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