while performing edx on powder MgB2 sample in TEM, i observe Cu and C intense peaks. I was thinking this might be because of the TEM grid i am using. But can anyone help me how to avoid these signals.
Of course you cannot " choose the elements you expect in your sample to be detected", you'll detect everything (comments above are wrong). If you use carbon or polymer support film, you cannot get rid of C peak. You can decrease/eliminate Cu peak generated by a grid:
- Remove objective aperture during EDS analysis.
- Use top hat aperture
- Use Be (instead of Cu) grid, but it is rather expensive.
Dear Sai srikanth Arvapalli
I think, you can easily chose which one of the elements you are interested in to be detected.
In addition, you can subtract the peak so that you will have a curve without the peak.
Yours Sincerely,
Masoud Tayefi
dear Sai srikanth Arvapalli ;
from my experience in EDX, you can choose the elements you expect in your sample to be detected. also you can exclude other elements if you expect it might be present in the polluted base of the device.
Of course you cannot " choose the elements you expect in your sample to be detected", you'll detect everything (comments above are wrong). If you use carbon or polymer support film, you cannot get rid of C peak. You can decrease/eliminate Cu peak generated by a grid:
- Remove objective aperture during EDS analysis.
- Use top hat aperture
- Use Be (instead of Cu) grid, but it is rather expensive.
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