The analysis and testing business of Ou Botong Materials Analysis Research Center was officially launched at the beginning of the year and received extensive attention in the industry. Recently, the center received consultations from many customers and asked about the preparation methods or solutions for some special samples. Based on customer consultation and feedback, we have compiled relevant cases to share with you, hoping to give you some ideas.
1. Micro-nanoparticles (for samples below 200μm)
Applications: Internal structure analysis of micro/nano materials
For example: lithium battery anode materials, micro-nano particles
Most of the samples of the granules use scanning electron microscopy to detect morphology, particle size statistics, energy spectrum and some length measurements, but it is difficult to meet the requirements of ordinary sample preparation when it comes to internal structure observation.
Disadvantages of sample preparation
Grinding/blade crushing can only see the situation of the section, and the success rate is not high, the electron microscope observation needs time-consuming search
Mosaic embedding requires mechanical polishing, easy to fall off; time consuming; need to consider the influence of the insert on the sample
For example, Figure 1 shows the customer's requirement to observe the surface and cross-section of the particles. After grinding, the results are not satisfactory. A large number of broken particles can be seen in the field of view, and the cross-section conditions are different and measurement is impossible.
figure 1
Figure 2 shows the results of polishing with Gatan Ilion II equipment. The particles in the visible field are all cut open, the section is flat, and easy to observe and measure. Figure 3 is a partial enlargement, and the internal structure of the particles is unobstructed.
figure 2
image 3
Second, multi-layer composite / coating / polymer film
Applications: Layered materials, films or other flexible materials
For example: lithium battery separator, plating, etc.
Multi-layer composites are extremely widely used in our lives, such as various touch screens. This kind of material mainly depends on the stratification of the section, but due to its large flexibility, common methods such as shearing, liquid nitrogen brittle fracture, etc. will lead to problems such as layering distortion and uneven section, which will affect the subsequent stratified measurement by electron microscope. For example - the sample is a battery plate (Figure 4, Figure 5):
Figure 4 shows the results of electron microscopy after shearing. It can be seen that due to the influence of shearing force, the level is not clear enough to make accurate measurements and cannot provide effective information.
Figure 4
Figure 5 shows the results of polishing the Gatan Ilion II with clear levels for accurate measurements.
Figure 5
Third, electronic components
Applications: All types of micro components
As electronic components become smaller and more complex, they are difficult to locate when they fail, and it is difficult to see their internal structure by ordinary means (Fig. 6). The results in the figure are processed by Ilion II, and the partially magnified image can see dozens of nm structures, which is greatly facilitated by subsequent analysis.
Image 6
Let's look at another example (Figure 7)
Figure 7
The red frame 1 is partially enlarged, and there are 10 layers of structure.
Figure 8
Red box 2 is partially enlarged, at a glance
Figure 9
postscript
The above is a small series of content shared this time, I hope to help everyone, and finally the advertising time.
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