Sourty Erwan, van Bavel Svetlana, Lu Kangbo, Guerra Ralph, Bar Georg, Loos Joachim
Laboratory of Materials and Interface Chemistry and Soft-Matter CryoTEM Research Unit, Eindhoven University of Technology, PO Box 513, NL-5600 MB Eindhoven, The Netherlands.
Microsc Microanal. 2009 Jun;15(3):251-8. doi: 10.1017/S1431927609090278.
Two purely carbon-based functional polymer systems were investigated by bright-field conventional transmission electron microscopy (CTEM) and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). For a carbon black (CB) filled polymer system, HAADF-STEM provides high contrast between the CB agglomerates and the polymer matrix so that details of the interface organization easily can be revealed and assignment of the CB phase is straightforward. For a second system, the functional polymer blend representing the photoactive layer of a polymer solar cell, details of its nanoscale organization could be observed that were not accessible with CTEM. By varying the camera length in HAADF-STEM imaging, the contrast can be enhanced between crystalline and amorphous compounds due to diffraction contrast so that nanoscale interconnections between domains are identified. In general, due to its incoherent imaging characteristics HAADF-STEM allows for reliable interpretation of the data obtained.
通过明场常规透射电子显微镜（CTEM）和高角度环形暗场扫描透射电子显微镜（HAADF-STEM）研究了两种纯碳基功能聚合物体系。对于炭黑（CB）填充的聚合物体系，HAADF-STEM在CB团聚体和聚合物基体之间提供了高对比度，因此可以轻松揭示界面组织的细节，并且CB相的识别很直接。对于第二个体系，即代表聚合物太阳能电池光活性层的功能聚合物共混物，可以观察到其纳米级组织的细节，而这些细节是CTEM无法获取的。通过在HAADF-STEM成像中改变相机长度，由于衍射对比度，可以增强晶体和非晶化合物之间的对比度，从而识别出域之间的纳米级互连。一般来说，由于其非相干成像特性，HAADF-STEM能够对所获得的数据进行可靠的解释。
