I am working on graphene nanoplatelets (GNP) and polymer composites. The thermogravimetric data if GNP shows a three-step weight loss when heated up to 900 C (please look at the attached curve). I have concerned about the second and the third weight loss. can anyone share their knowledge on this process?
Thank you Vadim S. Gorshkov
Hi Pralhad Lamichhane
Please provide the medium of the TGA analysis. If it was performed in the air then there will be a high chance of aerial oxidation to form CO2. Thus the mass loss can occur in the 2nd and 3rd stages. Please try to perform it in inert medium e.g., N2 medium, and tally with the previous result. This I can suggest from my side.
Regards
Hi,
These are attributed (in sequence) to (i) desorption of water molecules, (ii) labile oxygen groups (epoxides, hydroxyls) and (iii) stable oxygen-based groups (carboxyls). You might find that your thermograph is slightly different between runs in air and nitrogen depending on what you want to see.
Have a look at my study on this, might be useful: Article Structural and chemical comparison between moderately oxygen...
Regards
Thank you, everyone, for your valuable suggestions. This thermogram was the TGA that I performed in the air. I hope it will be different if I do it in an inert atmosphere.
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