electrical conductivity of carbon/multi -walled carbon nanotube xerogel composites

Carbon/multi-walled carbon nanotube(MWNT) xerogel composites were prepared through sol-gel polymerization of resorcinol-formaldehyde(RF) in aqueous MWNT suspension in the presence of sodium dodecyl benzene sulfonate (NaDBS) followed by drying and pyrolysis of the gels. The morphology of carbon nanotube(CNT) dispersion was studied by X-ray microtomography, optical microscopy, SEM and TEM. The results of electrical conductivity measurements of the composites showed a drastic enhancement of electrical conduction coefficient .This increase can be explained by formation of strings of connected CNT clusters in carbon gel matrix, which is in perfect agreement with effective medium theory (EMT).

کلیدواژه ها:

Carbon xerogel ، Carbon nanotube ، Porosity ، Dispersion state ، Electrical conductivity