利用冷冻原子探针断层扫描分析纳米多孔铜针中的水冰
Analysis of water ice in nanoporous copper needles using cryo atom probe tomography
AI总结：
本研究提出使用纳米多孔Cu针作为物理框架承载水冰，克服了冷冻液体样品制备的困难，通过APT分析揭示了其微观结构及简化质谱的优势。
摘要：
将原子探针断层扫描（APT）应用于冷冻液体受到样品制备困难的限制。在此，我们报告了使用纳米多孔Cu针作为物理框架来承载水冰，以供APT研究。纳米多孔Cu针是通过Cu-Mn火柴头前驱体的电解抛光和脱合金制备的。冷冻扫描电子显微镜和聚焦离子束铣削显示了一种分层、树枝状、高度可润湿的微观结构。原子探针质谱主要由Cu+和H(H2O)n+（n <= 3）的峰主导，重建体积显示了Cu韧带向充满冰的孔隙中的突出。连续的Cu韧带网络在电学上将针尖连接到冷台，导致针尖处电场增强和冷却增加，与以前的报告相比，这两者都简化了质谱。
英文摘要：
The application of atom probe tomography (APT) to frozen liquids is limited by difficulties in specimen preparation. Here, we report on the use of nanoporous Cu needles as a physical framework to hold water ice for investigation using APT. Nanoporous Cu needles are prepared by the electropolishing and dealloying of Cu-Mn matchstick precursors. Cryogenic scanning electron microscopy and focused-ion beam milling reveal a hierarchical, dendritic, highly-wettable microstructure. The atom probe mass spectrum is dominated by peaks of Cu+ and H(H2O)n+ up to n <= 3, and the reconstructed volume shows the protrusion of a Cu ligament into an ice-filled pore. The continuous Cu ligament network electrically connects the apex to the cryostage, leading to enhanced electric field at the apex and increased cooling, both of which simplify the mass spectrum compared to previous reports.
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