Author/Authors :
Maser، نويسنده , , W.K. and Benito، نويسنده , , A.M and Callejas، نويسنده , , M.A and Seeger، نويسنده , , T and Mart??nez، نويسنده , , M.T and Schreiber، نويسنده , , J and Muszynski، نويسنده , , J and Chauvet، نويسنده , , O and Osv?th، نويسنده , , Z and Ko?s، نويسنده , , A.A and Bir?، نويسنده , , L.P، نويسنده ,
Abstract :
New polyaniline/nanotube (PANI/NT) composites have been synthesized by “in situ” polymerization processes using both multi-wall carbon nanotubes (MWNTs) and single-wall carbon nanotubes (SWNTs) in concentrations ranging from 2 to 50 wt.%. Although no structural changes are observed using MWNTs above a concentration of 20 wt.%, the in situ synthesis results in electronic interactions between nanotubes and the quinoid ring of PANI leading to enhanced electronic properties and thus to the formation of a genuine PANI/MWNT composite material. On the other hand, using SWNTs favors the formation of inhomogeneous mixtures rather than of a homogeneous composite materials, independent of the SWNT concentration. X-ray diffraction, Raman and transport measurements show the different behavior of both classes of nanotubes in PANI/NT materials. The difficulties in the formation of a true PANI/SWNT composite are related to the far more complex structure of the SWNT material itself, i.e. to the presence of entangled bundles of SWNTs, amorphous carbon and even catalytic metal particles.
