I am wondering how the thermal transport properties of 2D materials impacting the S/N ratio of Raman measurements when 2D material is used as a Raman substrate. How is graphene's higher thermal conductivity is beneficial compared to other 2D materials as a substrate in Raman measurements for achieving a higher signal-to-noise ratio in particular?
Jeewan Ranasinghe,
This is an interesting and complex question, which I'll try to give some insight. To begin, 2D materials are inherently difficult to quantify regardless of characterization technique. This being said, Raman spectroscopy measures the Raman shift, which inherently relies on the vibration of bonds between atoms where a change in the polarizability is present. Knowing this, all bonds vibrate differently under various circumstances (i.e. like temperature), similar to masses connected by a spring. Therefore, preparation technique, laser power, laser wavelength, objective, optics etc. all play a major role in the S/N ratio.
All together, thermal transport properties will vary with composition and phase, i.e. the bonds in the 2D framework which will inherently effect the S/N ratio of the spectra. For example, C-C bonds in graphitic materials have a very strong Raman response, but each spectra is inherently different due to the amount of disorder. This is outlined in this RSC paper (Article Raman spectroscopy of graphene-based materials and its appli...
). Mn-O bonds in comparison have an inherently weak Raman response, and the materials all resemble each other due to the similarities in structure between phases. This is outlined in detail how this changes with temperature with a paper I have co-authored (Article Hierarchical porosity via layer-tunnel conversion of macropo...
).I've not seen any paper directly linking the thermal transport properties with the S/N ratio. However, the carbon based materials is probably an ideal system to test this on based on the amount of literature available.
Cheers and hope this helps!
Alec Ladonis thank you so much for your detailed explanation. As you mentioned this could be a complex question due to several factors and I couldn't also see any literature correlating thermal transport properties of 2D materials with the S/N ratio.
Hi Jeewan
I would like to thank Alec Ladonis for his detailed answer.
Actually, I can't add more on his answer. But I think the following two papers can help
https://doi.org/10.3389/fmats.2020.578791
doi: 10.3390/molecules24010088
Have a good day
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