Hi, I'd like to measure the C-H bonds in graphene oxide in suspension in any liquid but can't find a solvent with very small absorption to that ~3000cm-1 region.
Do you think there is any?
thanks a lot!
Dear Carles Ros , a good idea would be to use some solvent without C-H bonds, such as CCl4
https://webbook.nist.gov/cgi/cbook.cgi?ID=C56235&Type=IR-SPEC&Index=4
Bear in mind that CCl4 is very toxic.
https://en.wikipedia.org/wiki/Carbon_tetrachloride
May be D2O might be useful too, it has a strong band at around 2500cm-1.
Hope this helps. (And thanks for your nice talk at the ICFO school! )
Carbontetrachloride is a standard solvent to observe CH and OH regions since the solvent is transparent above 2000 cm-1. If you want to suspend a fine powder in a more viscous liquid, rather than a low viscosity liquid like carbon tetrachloride (in case your suspension precipitates during the experiment), you can use a material called fluorolube. This is a fluorinated hydrocarbon without any CH groups and thus again, above 2000 cm-1, it is transparent.
Unless good solvency is required for use of toxic CCl4 or CS2, you will probably want to employ perfluoroethers. The PFPEs are fully transparent in mid-IR at wavenumbers above 1500 cm-1. The low-molecular-weight Fomblin Y06/6 (the one used for rotary vacuum pumps) might be worth giving a go. It is rather viscous at r.t. but gets considerably thinner at elevated temperatures (water-like at 150'C). If you find it feasible to disperse the GO in hot PFPE (straightforward with sonication), you can take advantage of the viscosity rise following cooling down to r.t. to obtain a very stable dispersion.
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