چكيده لاتين :
Nover polypyrrole (PPy) hollow micrometer-sized V-junctions and capsules were
selectively prepared via in-situ polymerization. The rod junctions or particles of
benzyl orange (BO) precipitates were used as reactive templates which were
obtained by adding HCI or FeCI3 to 80 aqueous solution, respectively. PPy formed on
the surface of the templates and the templates could be removed easily by routine
washing with water for BO-HCr or by direct self-degradation for BO-FeCI3 .
Transmission electron microscopy (TEM) and scanning electron microscopy (SEM)
results showed that, the PPy hollow V-junctions and capsules with morphologies similar
to those of templates were obtained after templates removal. The effects of pH, the
speed of the oxidant addition and the reaction temperature on morphology of the PPy
microstructures were investigated and the special hollow structures could be observed
always under the appropriate conditions. It was found that more PPy V-junctions or capsules
were obtained when the polymerization rate was decreased either by controlling
the speed of oxidant addition or the reaction temperature, implying that the formation
of PPy micro/nanostructures by this 80 template method is a relatively slow process.
Moreover, the structure and property of the PPy microstructures have been characterized
by Fourier transform infrared spectrometry (FTIR) and X-ray diffraction (XRD)
techniques and electric conductivity measurements.
