高校化学工程学报2024，Vol.38Issue(6)：932-940,9.DOI:10.3969/j.issn.1003-9015.2024.06.011
差分相位衬度技术解析催化剂表/界面电场潜在假象探讨
Investigation of possible illusion in catalyst surface/interface electric fields resolved by differential phase contrast
申嘉岳 1李超 1刘锐锐1
作者信息
- 1. 天津理工大学 材料科学与工程学院,新能源与低碳技术研究院先进功能多孔材料实验室电子显微镜中心,天津 300384
- 折叠
摘要
Abstract
In order to address electron inaccuracies in analyzing surface electric field of catalysts using differential phase contrast(DPC)technique,an electron microscopy image simulation method was proposed.DPC imaging simulations were performed on heterogeneous interfaces and irregular particle edges to analyze electric field information through DPC and electric field relationship.Subsequently,the DPC results of particle edges and heterogeneous interfaces under different defocus and astigmatism were simulated with real imaging parameters using a FEl-Titan Themis Cubed G2 60-300 microscope.The results reveal that the scattering differences of heterogeneous atoms by electron beam causes additional displacement of atomic electric field at the interface.For samples with irregular interfaces,the irregular surface shape results in additional beam deflections and leads to inaccurate determination of electric fields at the interface.As sample thickness increases,the electron beam generates phase shift,and leads to inaccuracies in atomic inter-electrostatic field measured by DPC.Moreover,reducing defocus amount during DPC imaging is necessary to avoid false electric field inversion or displacement caused by defocus.The value of third-fold astigmatism during imaging processes needs to be focused and adjustments should be made in a timely manner to obtain more accurate DPC results.关键词
差分相位衬度技术/Au颗粒/Au-Pt异质界面/厚度/欠焦/像散Key words
differential phase contrast/Au particles/Au-Pt heterogeneous interfaces/sample thickness/defocus/astigmatism分类
化学化工引用本文复制引用
申嘉岳,李超,刘锐锐..差分相位衬度技术解析催化剂表/界面电场潜在假象探讨[J].高校化学工程学报,2024,38(6):932-940,9.
