The correct sample preparation is a crucial and very important step for the quality and reproducibility of results in electron microscopy, especially transmission electron microscopy (TEM).
Depending on the sample material and the question, there are numerous and sometimes very complex preparation methods. Sample preparation for electron microscopic examinations is literally a "science in itself" and sometimes requires extensive experience and know-how.
We would be happy to advise you on which preparations or preparation procedures are most suitable for your samples.