In Situ Domain-Confined Epitaxial Regrowth of Individual Nanoparticle: Implications for Nanofabrication
In Situ Domain-Confined Epitaxial Regrowth of Individual Nanoparticle: Implications for Nanofabrication
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DOI：
10.1021/acsanm.2c04164
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发表时间：
2022-12-07
影响因子：
5.9
通讯作者：
Sun，Litao
中科院分区：
文献类型：
--
作者：
Tang，Luping;Zhang，Yangyang;Sun，Litao
电子束辐照已成为设计材料结构和研究纳米结构生长到单个纳米颗粒（NP）水平的有力工具;该方法具有重要的基础研究意义和潜在的技术应用。然而，由于纳米粒子在纳米制造过程中的快速和不受约束的进化，在高能轰击下控制纳米粒子的生长是具有挑战性的。在此，使用在300 kV下操作的FEI Titan 80-300透射电子显微镜进行部分升华的NP的外延再生长的实时原位研究。通过在500 °C下电子束照射大（35 nm）CuAg NP获得粒径为2-20 nm的含有Ag、Cu和CuAg的混合NP。纳米粒子随着温度升高而升华。有趣的是，对于部分升华的NP，观察到Ag{111}和{100}面上的畴限制的逐层外延再生长。新生长的部分主要是银，使用能量色散X射线光谱法测定。电子束辐照是外延再生长的关键激活剂。这项研究提供了原子水平上的实时再生动力学信息，为气体环境中的纳米结构生长控制提供了新的见解，在纳米纤维中找到了有前途的应用。
Electron beam irradiation has become a powerful tool for designing material structures and studying nanostructure growth down to the individual nanoparticle (NP) level; the method has important fundamental research implications and potential technological applications. However, controlling NP growth under high-energy bombardment is challenging owing to the rapid and unconstrained evolution of NPs during nanofabrication. Herein, a real-time in situ study of epitaxial regrowth of partially sublimated NPs was performed using an FEI Titan 80–300 transmission electron microscope operated at 300 kV. Hybrid NPs containing Ag, Cu, and CuAg with particle sizes of 2–20 nm were obtained via electron beam irradiation of large (35 nm) CuAg NPs at 500 °C. NPs sublimed with increased temperature. Interestingly, domain-confined layer-by-layer epitaxial regrowth on the Ag{111} and {100} facets was observed for partially sublimated NPs. The newly grown part was mostly Ag, as determined using energy-dispersive X-ray spectroscopy. Electron beam irradiation was a key activator for epitaxial regrowth. This study provides real-time regrowth dynamics information at an atomic level, providing new insights into nanostructure growth control in gaseous environments, finding promising applications in nanofabrication.