Charge transport and structure of nanocomposites of polyaniline and inorganic clay

Citation
Bh. Kim et al., Charge transport and structure of nanocomposites of polyaniline and inorganic clay, J KOR PHYS, 36(6), 2000, pp. 366-370
Citations number
18
Categorie Soggetti
Physics
Journal title
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
ISSN journal
03744884 → ACNP
Volume
36
Issue
6
Year of publication
2000
Pages
366 - 370
Database
ISI
SICI code
0374-4884(200006)36:6<366:CTASON>2.0.ZU;2-5
Abstract
We report the charge transport and the structural properties of nanocomposi tes of polyaniline (PAN) with inorganic clay (Na+-montmorillonite), which w ere synthesized by using a emulsion polymerization method. Dodecylbenzenesu lfonic acid (DBSA) and camphorsulfonic acid (CSA) were used to dope the PAN samples. In the X-ray diffraction patterns of the systems, we observed tha t the layer of conducting PAN-DBSA or PAN-CSA between the clay layers was i n nanoscale layers (< 10 Angstrom). The de conductivity (sigma(dc)) of PAN- DBSA with the clay was similar to 10(-1) S/cm and that of PAW-CSA with the clay was similar to 1 S/cm, at room temperature. The temperature dependence of both systems followed a quasi-one-dimensional variable-range-hopping mo del. In electron paramagnetic resonance (EPR) experiments, we measured the temperature dependence of the EPR linewidth (Delta Hp-p) and of the signal intensity of the systems. The doping level of the systems was obtained from the ratio of the area of the nitrogen X-ray photoelectron spectroscopy (XP S) peak to that of the sulfur XPS peak. The charge transport, the spin dyna mics, and the structure properties of PAN-DBSA without the clay, which was synthesized through the same emulsion polymerization method, were compared to the PAN-DBSA samples with clay samples.