Try to collect the particles, make a pellet. I would suggest to use Raman instead of IR to identify the amount and type of carbon present in the precipitate. (As Raman depends on polarizability changes rather than on dipolar changes, it is better for nonpolar atomic bond based lattices). If you have Raman microscopy, you can get additional information on the distribution. The Raman frequency depends on the carbon type, sometimes even on mechanical stress (e.g. in the case of carbon nanotubes).
Thank you for your response and sugestions. I have alredy donne the KBR pellets and the equipment used for FTIR analysis was a Thermo Nicolet 6700. I would like to know the typical value of the absortion band for the elemental carbon
Not new, but comprehensive: http://web.anl.gov/PCS/acsfuel/preprint%20archive/Files/15_1_LOS%20ANGELES_03-71_0123.pdf
graphene: http://web.anl.gov/PCS/acsfuel/preprint%20archive/Files/15_1_LOS%20ANGELES_03-71_0123.pdf
soot. http://patarnott.com/pdf/AIDA/web-editions-2.pdf
A PhD thesis: https://tspace.library.utoronto.ca/bitstream/1807/17246/1/Williams_Shazam_200811_PhD_thesis.pdf
I think it will be enough for beginning ...
Thank you again for your precious help and for the links that you have send me.
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