A Brief Comment on Atom Probe Tomography Applications
A Brief Comment on Atom Probe Tomography Applications
复制标题
原子探针断层扫描应用简评
DOI：
--
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Chan‐Gyung Park
中科院分区：
文献类型：
--
作者：
J. Seol;Young‐Tae Kim;Chan‐Gyung Park
原子探针层析成像（APT）技术已广泛应用于金属、金属合金、陶瓷、半导体等多种材料中，用于研究微量元素的三维分布、偏析或分配。例如，这种高分辨率表征技术有助于理解光元素的漫射（例如，硼和碳）、界面偏析、第二相沉淀颗粒和它们的基质相之间的化学组成梯度（Bang等，2015; Kim等人，2015; Park等人，2015; Seol等人，2010、2011、2012、2013 a、2013 b、2013 c、2016 a）。脉冲激光APT系统的最新显著进展现在使得能够分析生物材料以获得细胞离子的3D空间分布（Gordon & Joester，2011; Karlsson等人，2015; Narayan等人，2012年）。通过对曲率半径小于50 nm的非常尖锐的样品施加高的正电压，样品最表面的原子几乎一个原子一个原子地、一个原子一个原子地被场蒸发。场蒸发的原子在针尖表面电离，并加速朝向位置敏感探测器，该位置敏感探测器同时记录它们的飞行时间（ToF）和撞击位置。离子的ToF与其动能和势能直接相关，因此通过使两种能量相等，可以如下确定离子的质荷比（m/n），并且它能够识别元素种类。可以从收集的数据重建3D元素图。在以下参考文献中描述了原理的更多细节（Gault等人，2012; Kelly &米勒，2007; Larson等人，2013 b;米勒和福布斯，2014）。
Atom probe tomography (APT) has been widely applied to wide range of materials including metals, metal alloys, ceramics, and semiconductors for going through threedimensional distribution, segregation or partitioning of trace elements. For example, this high-resolution characterization technique helps to understand diffusion of light element (e.g., boron and carbon), segregation at inter faces, gradients in chemical composition between second phase precipitate particles and their host matrix phase (Bang et al., 2015; Kim et al., 2015; Park et al., 2015; Seol et al., 2010, 2011, 2012, 2013a, 2013b, 2013c, 2016a). Recent significant advances of pulsedlaser APT system now enable analysis of biological material to obtain 3D spatial distributions of cellular ions (Gordon & Joester, 2011; Karlsson et al., 2015; Narayan et al., 2012). By applying high positive voltage to a very sharp specimen having a radius of curvature under 50 nm, the atoms at the very surface of specimen are field-evaporated almost atomby-atom and atomic-layer after atomic-layer. The fieldevaporated atoms are ionized on tip surface and accelerated towards a position sensitive detector that records their time of flight (ToF) and impact position, simultaneously. The ToF of the ion is directly related to its kinetic energy and potential energy, so by equating the two energies, the mass-to-charge ratio (m/n) of the ion can be determined as below and it enables the identification of elemental species. A 3D elemental map can be reconstructed from the collected data. More details of principle are described in following reference (Gault et al., 2012; Kelly & Miller, 2007; Larson et al., 2013b; Miller & Forbes, 2014).
影响因子：
3.2
作者：
Choi, Pyuck-Pa;Cojocaru-Miredin, Oana;Raabe, Dierk
通讯作者：
Raabe, Dierk