Fondazione Bruno Kessler, Povo, Italy.
J Synchrotron Radiat. 2011 Sep;18(Pt 5):773-81. doi: 10.1107/S0909049511019364. Epub 2011 Jul 8.
The ability to probe morphology and phase distribution in complex systems at multiple length scales unravels the interplay of nano- and micrometer-scale factors at the origin of macroscopic behavior. While different electron- and X-ray-based imaging techniques can be combined with spectroscopy at high resolutions, owing to experimental time limitations the resulting fields of view are too small to be representative of a composite sample. Here a new X-ray imaging set-up is proposed, combining full-field transmission X-ray microscopy (TXM) with X-ray absorption near-edge structure (XANES) spectroscopy to follow two-dimensional and three-dimensional morphological and chemical changes in large volumes at high resolution (tens of nanometers). TXM XANES imaging offers chemical speciation at the nanoscale in thick samples (>20 µm) with minimal preparation requirements. Further, its high throughput allows the analysis of large areas (up to millimeters) in minutes to a few hours. Proof of concept is provided using battery electrodes, although its versatility will lead to impact in a number of diverse research fields.
在多尺度下探测复杂体系的形貌和相分布，揭示了宏观行为起源处纳米和微米尺度因素的相互作用。虽然不同的基于电子和 X 射线的成像技术可以与高分辨率光谱相结合，但由于实验时间的限制，得到的视场太小，无法代表复合材料样品。在这里，提出了一种新的 X 射线成像装置，将全视野透射 X 射线显微镜（TXM）与 X 射线吸收近边结构（XANES）光谱相结合，以高分辨率（数十纳米）跟踪大体积的二维和三维形貌和化学变化。TXM XANES 成像在具有最小制备要求的厚样品（>20 μm）中提供纳米尺度的化学物质形态。此外，其高通量允许在几分钟到几个小时内分析大区域（可达毫米）。使用电池电极提供了概念验证，尽管其多功能性将在许多不同的研究领域产生影响。
