You may perhaps find useful to check previous somewhat related RG discussions: https://www.researchgate.net/post/What_will_be_the_best_solvent_other_than_acetone_to_disperse_CNT https://www.researchgate.net/post/hi_which_will_be_the_best_solvent_for_dispersing_the_single_wall_CNT_o-DCB_chloroform_acetone_methanol_NMP_pls_help_TQ https://www.researchgate.net/post/what_chemical_reaction_happen_when_mixing_of_CNT_powder_and_PVDF_into_the_organic_solvent_Ethanol_and_DMF

I have idea for deposition of reinforcement. Are you want to deposit CNT or CNT with matrix(ex. polymer)?

Before dip coating you should disperse the CNT in solvent of matrix (dispersion is tricky).

First do ultrasonication of the CNTs in DMF and then start the dip coating.