I am working with PVDF films, which I prepare using DMF at 65°C. sometime, in the FTIR analysis of these films, a flat curve appears in the region where the beta phase peak is expected. What could be the reason for this flat curve? i am attaching the IR spectra for the reference.
Dear Anshika Passi,
From what I understand, you are measuring the spectrum using the transmission technique, specifically the thin-film method. As you can see, in this region, the transmittance is zero, indicating that the sample absorbs all radiation within this range of wavenumbers. Your film is likely too thick. If it were thinner, you would be able to record the spectrum. If reducing the thickness is not feasible, you could also use the ATR technique, which would avoid this issue.
Hello Anshika,
The reply of Król is correct. Another alternative is weight 1/4 when you prepare the film with the same amount of DMF use initial. If you see that the signal touch the 0%T dilute more the sample.
Best
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