Hello Everyone, I am making some grapheme film, and exposing it to different gases. After that I am doing ATR(Attenuated Total reflectance) to see the effect. The problem is When I am exposing to Acetone and Ethanol it is showing a dip at 2400 cm-1, which you will find in the picture added. I don't know how to explain the dip and other portion of the curve. help appreciated. Thanks
Hello!
In the FT-IR-ATR spectroscopy, the sharp band from 2360-2400 cm-1 is attributed to carbon dioxide which is present in air and from your breath. This band is always excluded from discussions and also you can break the spectrum in this range using different spectrum programs (I use OriginPro8). I have also observed that your sample has no good contact with crystal because the spectrum is too noisy, and the ratio between the noise and the transmittance bands is too high. Try to improve the contact between crystal and sample.
Best regards,
PhD.eng. Andreia Molea.
Hello!
In the FT-IR-ATR spectroscopy, the sharp band from 2360-2400 cm-1 is attributed to carbon dioxide which is present in air and from your breath. This band is always excluded from discussions and also you can break the spectrum in this range using different spectrum programs (I use OriginPro8). I have also observed that your sample has no good contact with crystal because the spectrum is too noisy, and the ratio between the noise and the transmittance bands is too high. Try to improve the contact between crystal and sample.
Best regards,
PhD.eng. Andreia Molea.
Good Afternoon,
I agree with Andreia on the poor contact with the sample. I'm assuming you are using a diamond crystal by the looks of the noise increase between 2000-2500. Diamond has lower throughput in this region and commonly shows an increase in noise over that region as well as below 500. Also the spike around 2400 is indeed Carbon dioxide.
Hello
let us see the spectrum of unexposed film in order to compare between exposed and unexposed films. if this dip could detected in the unexposed film I completely agree with Andreia and you should neglect this dip part of the spectrum.
I suggest that you can repeat collecting the data with making possible pursuing for your spectrometer with N2 Gas to avoid the noise
- Badges
- Science topic
- Similar topics
- Engineering
- Materials Engineering