Preparation of polypyrrole nanoparticles and their composites: effect of electronic properties on hydrogen adsorption

Abstract

A facile method for the preparation of electrically conducting polypyrrole nanoparticles and their nanocomposites with single-walled and multi-walled carbon nanotubes was developed. The polypyrrole nanoparticle size and conductivity varied as a function of reaction time with an average size of 143-195 nm and a conductivity range of 0.43-0.82 S/cm. The change in the electronic properties of the conducting nanocomposite and the influence of this change on the adsorption of hydrogen molecules onto the nanocomposite was investigated by considering the effect on π-electron system role on hydrogen adsorption mechanism. The nanocomposite materials were characterized by microscopic and spectroscopic techniques, thermal gravimetric analysis, and electrical conductivity measurements. The hydrogen adsorption was measured volumetrically by the commercial computer-controlled pressure-composition temperature method and found to be 1.14 to 2.75 wt.% at cryogenic conditions.

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