Atom probe instrument for the imaging of hydrogen in materials – laser pulsing / detector upgrade

用于材料中氢成像的原子探针仪器 â 激光脉冲/探测器升级

• 批准号: 516600907
• 金额: --
• 依托单位: Friedrich-Alexander-Universität Erlangen-Nürnberg
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2023
• 资助国家: 德国
• 起止时间: 2022-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/516600907?language=en
• 关键词: Atom; probe; instrument; imaging; hydrogen

APT has been widely used to study a range of high-strength structural alloys, semiconductor materials and oxides. It is uniquely suited for the imaging and analysis of all chemical elements in a sample without bias and with equal sensitivity. At FAU we aim to be on the forefront of atom probe tomography research. This includes in-house developed systems with special capabilities. Up to recently, APT excluded the imaging and analysis of hydrogen due to contamination from the stainless-steel chambers used. The in-house developed systems include a high-end instrument with titanium interior and chamber, resulting in an ultra-low hydrogen background for direct detection of hydrogen1. This instrument is the first and currently only one world-wide to achieve this. It can provide imaging and analysis for all chemical elements with equal sensitivity. This is especially important for the research on materials for the hydrogen economy. In this proposal we seek the upgrade of this ultra-low H atom probe system to state-of-the-art laser assisted field evaporation with an adequate digital front-end detector. This will serve multiple purposes. Firstly, it will allow the analysis of hydrogen in non-conductive materials and greatly increase the data yield on conductive specimens. Secondly, it will improve the detection efficiency of non-random detector hits, which are especially prevalent in laser-assisted atom probe tomography and therefore increase the analysis accuracy. Thirdly, it will enable us to analyse non-conductive materials with high detection efficiency (> 80% of all atoms), complementary to our existing instrument, which provides < 40 % detection efficiency albeit at high mass resolution. The upgrade consists of: (i) a tuneable deep-UV fs laser with < 300 nm minimum wavelength, > 1000 pJ pulse energy and a pulse repetition rate > 200 kHz, including optics for diffraction limited focussing and spot positioning. (ii) A delayline detector (detector head, high voltage power supply and pre-amplifier) with at least one redundant delayline and direct digitization with ≥ 2.5 GSa/s/ch on at least one channel per delayline endpoint. The atom probe laser upgrade applied for here will used in a broad research environment of materials research at FAU. The starting point is the Institute for General Materials Properties (WW1), where the fascinating possibilities of the atom probe are used very profitably in different areas (e.g. lightweight construction materials, catalysis, particle technology) and together with our collaboration partners (TU Wien, MU Leoben / Uni Innsbruck, Paul Scherrer Institute, Oak Ridge National Lab and more). The atom probe upgrade will also continue to enrich research at important FAU institutes, such as the Central Institute for New Materials and Process Technology, ZMP, and the Helmholtz Institute Erlangen-Nuremberg, which focuses on materials research for renewable energies.

APT已被广泛用于研究一系列高强度结构合金，半导体材料和氧化物。它独特地适合对样品中所有化学元件的成像和分析，没有偏见和同样的灵敏度。在FAU，我们的目标是在Atom探针断层扫描研究的最前沿。这包括具有特殊功能的内部开发系统。直到最近，APT除了使用不锈钢腔室的污染而排除了对氢的成像和分析。内部开发的系统包括带有钛内部和腔室的高端仪器，导致直接检测氢1的超低氢背景。该乐器是第一个实现这一目标的仪器，目前只有一个仪器。它可以为所有具有相同灵敏度的化学元素提供成像和分析。这对于氢经济材料的研究尤其重要。在此提案中，我们寻求通过足够的数字前端探测器来升级该超低H原子探针系统，以辅助实地经济。这将有多种目的。首先，它将允许对非导电材料中的氢分析，并大大增加导电样本的数据产量。其次，它将提高非随机检测器命中的检测效率，这在激光辅助原子探针断层扫描中尤为普遍，因此提高了分析精度。第三，这将使我们能够分析具有高检测效率的非导电材料（>所有原子的80％），这是我们现有仪器的完整材料，该仪器可提供<40％的检测效率，尽管质量分辨率很高。升级包括：（i）最小波长<300 nm，> 1000 pj脉冲能量和脉冲重复率> 200 kHz的可调深VS激光器，包括用于衍射有限的聚焦和斑点定位的光学。 （ii）具有至少一个冗余延迟线和直接数字化的延迟线检测器（检测器头，高压电源和预放大器），每个延迟线端点至少一个通道上的一个通道上的直接数字化。此处适用的原子探针激光升级将用于FAU的材料研究的广泛研究环境。起点是通用材料特性研究所（WW1），在该研究所在不同领域（例如，轻量级的建筑材料，催化，粒子技术）以及我们的合作伙伴（Tu Wien，Mu Leoben / Uni / Uni Innsbruck，Paul Scherrer Institute，Paul Scherrer Institute，Oaak ridge National）在不同领域（例如，轻量级建筑材料，催化，粒子技术）都非常使用原子探针的可能性。原子探针升级还将继续在重要的粮农组织研究所进行丰富研究，例如中央新材料与过程技术研究所，ZMP和Helmholtz Institute Erlangen-Nuremberg，重点是可再生能源的材料研究。