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Advanced optical micro-imaging methods for determining the structural and chemical state of materials: development of, and access to equipment

用于确定材料结构和化学状态的先进光学显微成像方法：设备的开发和获取

基本信息

批准号：
EP/F065272/1
负责人：
Nigel Poolton
金额：
$ 27.58万
依托单位：
Aberystwyth University
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2008
资助国家：
英国
起止时间：
2008 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FF065272%2F1
关键词：
Advanced optical micro imaging methods

项目摘要

Studying the luminescence emission properties of materials can be richly rewarding in terms of understanding the processes that give rise to light emission, providing a wealth of information concerning the presence and nature of defects that may be present within the material matrix. Applications are widespread from, for example, being an essential component in the development of technologically important materials for optoelectronic devices, to the geological dating of rocks. Depending on how a sample is excited, luminescent photons are capable of carrying with them information about their origin. If the core-levels of the atoms present in the material matrix are probed with synchrotron light, the chemistry and structure of the material from which the photon was emitted can be analysed, since the photons carry with them the X-ray absorption signatures of the host. Optical detection of x-ray absorption spectroscopy (OD-XAS) is therefore potentially one of the most important measurement methods available for materials science research, whereby a direct and unequivocal link needs to be established between the luminescent properties of a sample, and its structure and chemistry. Furthermore, in the case of heterogeneous samples, the ability to provide spatial resolution of the x-ray absorption signatures and optical emission is essential. Normally, such XAS imaging requires highly sophisticated synchrotron beam-line instrumentation. However, in OD-XAS lies an alternative and much more flexible possibility: since x-ray absorption spectra are available via the visible photon emission, this means that, in principle, relatively simple optical microscopy methods can be deployed to determine the spatial variation of the chemistry and structure of a sample's surface. In 2005, EPSRC provided funds for the construction of a unique instrument, CLASSIX (Chemistry Luminescence And Structure of Surfaces via micro-Imaging X-ray absorption) to exploit this elegant XAS imaging alternative. The investment has turned out to be extremely worthwhile, with the instrument yielding rich dividends in a truly multi-disciplinary arena, and establishing a new science area rich for exploitation. The basis for the current grant application derives from a convergence of a number of relevant issues. In 2008, the synchrotron radiation source at Daresbury will close after 26 years of operation. However, CLASSIX is in rising demand, and after 2008, this portable instrument will need to travel to synchrotrons across Europe, including the Diamond Light Source in the UK. As the original CLASSIX was a first generation prototype designed for use primarily at its home ground of Daresbury Laboratory, there is need for an upgrade to make this international mobility feasible. However, this also provides an ideal opportunity for the incorporation of new measurement methods that have been identified during the 2 years usage since construction, including (i) the addition of Raman micro-imaging capability, to complement the micro-imaged X-ray absorption spectroscopy, (ii) the replacement of the slow-scanning emission monochromator with advanced rapid-scan systems for image analysis and (iii) facilities for off-line x-ray excitation of the sample surfaces.CLASSIX (and its non-imaging counterpart MOLES), will transfer from Daresbury to Aberystwyth University mid-way in 2008, where it will be an essential component of the evolving research activities there. However, the demand for this unique instrument remains high for many UK research groups. This application thus makes the case for a modest investment to facilitate the continuing open access to CLASSIX (and MOLES) for both off-line and on-line research, and to implement the upgrades identified above. This will allow the UK to consolidate and enhance its current world-lead in these rapidly-evolving analysis methods.

研究材料的发光发射特性对于理解产生光发射的过程是非常有益的，可以提供有关材料基体中可能存在的缺陷的存在和性质的大量信息。应用范围很广，例如，作为光电设备重要技术材料开发的重要组成部分，到岩石的地质年代测定。根据样品的激发方式，发光光子能够携带有关其起源的信息。如果用同步加速器光探测材料基质中原子的核心能级，则可以分析发射光子的材料的化学和结构，因为光子携带主体的 X 射线吸收特征。因此，X 射线吸收光谱 (OD-XAS) 的光学检测可能是材料科学研究中最重要的测量方法之一，其中需要在样品的发光特性及其结构和化学性质之间建立直接且明确的联系。此外，在异质样品的情况下，提供 X 射线吸收特征和光学发射的空间分辨率的能力至关重要。通常，此类 XAS 成像需要高度精密的同步加速器束线仪器。然而，OD-XAS 存在另一种更灵活的可能性：由于可通过可见光子发射获得 X 射线吸收光谱，这意味着原则上可以采用相对简单的光学显微镜方法来确定样品表面化学和结构的空间变化。 2005 年，EPSRC 提供资金建造了独特的仪器 CLASSIX（通过微成像 X 射线吸收进行化学发光和表面结构），以利用这种优雅的 XAS 成像替代方案。事实证明，这项投资非常值得，该仪器在真正的多学科领域产生了丰厚的回报，并建立了一个可供开发的新科学领域。当前赠款申请的基础源于许多相关问题的汇集。 2008 年，达斯伯里的同步辐射源将在运行 26 年后关闭。然而，CLASSIX 的需求不断增长，2008 年之后，这种便携式仪器将需要前往欧洲各地的同步加速器，包括英国的钻石光源。由于最初的 CLASSIX 是第一代原型机，设计主要用于其达斯伯里实验室的主场，因此需要进行升级以使这种国际流动性可行。然而，这也为纳入自建造以来的两年使用期间确定的新测量方法提供了理想的机会，包括（i）增加拉曼显微成像功能，以补充显微成像X射线吸收光谱，（ii）用先进的快速扫描系统替换慢扫描发射单色仪进行图像分析，以及（iii）样品离线X射线激发设施 Surfaces.CLASSIX（及其非成像对应的 MOLES）将于 2008 年中期从达斯伯里转移到阿伯里斯特威斯大学，在那里它将成为那里不断发展的研究活动的重要组成部分。然而，许多英国研究小组对这种独特仪器的需求仍然很高。因此，该应用程序需要适度的投资，以促进对 CLASSIX（和 MOLES）的持续开放访问，以进行离线和在线研究，并实施上述升级。这将使英国能够巩固和增强其目前在这些快速发展的分析方法方面的世界领先地位。