The influence of hydrochloric acid doping on the microstructure and thermoelectric properties of poly(p-phenylenediamine) nanoparticles

摘要

Conductive poly(p-phenylenediamine) (PpPD) nanopowders doped with different-concentration hydrochloric acid (HCI) were synthesized by a typical chemical oxidative polymerization method. The PpPD powders were characterized by the Fourier transform infrared spectroscopy, UV-vis spectroscopy, H-1 nuclear magnetic resonance spectroscopy and transmission electron microscope. The results showed that the morphology of the products changed from mainly spherical nanoparticles of the pure PpPD to rod-like nanoparticles of HCI doped PpPD. The pure PpPD showed n-type conduction whereas the HCI doped PpPD exhibited p-type conduction. The PpPD doped by 1 M HCI showed a maximum power factor of about 0.56 mu W m(-1) K-2 at room temperature. The mechanism of the change of the conduction type has also been discussed. (C) 2017 Elsevier B.V. All rights reserved.