I was trying to imaging the 2D materials with aberration corrected TEM, including MoS2, ReS2 and graphene.
However, I found serious carbon contamination when zoom in at the region of interest.
I just follow the standard procedure to prepare the specimen: preparing 2D material/ethanol suspension, and disperse them onto a copper grid with lacey Carbon film after 30mins sonication.
How can get rid of the contamination given the beam sensitive nature of the 2D materials?
Hi, friend, i suggest you can change the TEM grid from carbon grid to pure Cu grid. because the pure Cu grid doesn't contain any carbon substrate. For HRTEM and STEM, pure Cu grid is much better, i think.
Simply mix by shaking your very diluted suspension in alcohol. Let her settle. Take for the mesh the smallest tiles that are on the surface.
Do not use C as a substrate.
https://www.emsdiasum.com/microscopy/products/grids/si_window.aspx
https://www.tedpella.com/grids_html/silicon-dioxide.htm
And use cold trap in your TEM.
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