Electromagnetic Functionalized and Core−Shell Micro/Nanostructured Polypyrrole Composites

Abstract

Core-shell micro/nanostructured and electromagnetic functionalized polypyrrole (PPy) composites were prepared by a self-assembly process associated with the template method in the presence of p-toluenesulfonate acid (p-TSA) as the dopant, in which the spherical hydroxyl iron (Fe[OH], 0.5-5 microm in diameter) functioned not only as the hard template, but also as the "core" of the micro/nanostructure, and the self-assembled PPy-p-TSA nanofibers (20-30 nm in diameter) acted as the "shell" (50-100 nm in thickness) of the microspheres. We found that the core-shell micro/nanostructures exhibit controllable electromagnetic properties by adjusting the mass ratio of Fe[OH] to pyrrole monomer. The micelle model was proposed to interpret the self-assembly of the core-shell micro/nanostructured composites.

Synthesis of hollow poly(aniline-co-pyrrole)–Fe3O4 composite nanospheres and their microwave absorption behavior

“…Among them, polyaniline (PANI) and polypyrrole (PYY) are promising materials for practical applications because of their controllable conductivity, environmental stability, ease of preparation and favorable physiochemical properties, In addition, the inorganic magnetic micro/nanoparticles can co-structure with a monomer to form micro/nanostructured composites via a self-assembly process [7][8][9][10][11]. Fe 3 O 4 nanoparticles have unique magnetic properties and facile synthesis routes.…”

Chemical One Step Method to Prepare Polyaniline Nanofibers with Electromagnetic Function

“…Especially, typical ''core-shell'' structured micro/nanostructures of polypyrrole (PPy) has been also prepared by the template-free method using micro-spherical hydroxyl iron as the template, [6] where the self-assembled PPy nanofibers formed on the surface of the hydroxyl iron microspheres reduces the inter-resistance between the micro/nanostructure. As a result, a maximum conductivity at a certain amount of magnetic particles is observed that differs from previously reported results, where the conductivity usually decreases with increasing the content of magnetic particles in the composites.…”

Self-Assembly of Gold Nanoparticles on Gold Core-Induced Polypyrrole Nanohybrids for Electrochemical Sensor of Dopamine

“…The peaks at around 1560 cm À1 and 1480 cm À1 are assigned to the antisymmetric ring stretching mode and symmetric mode of Py ring. 39 A large and descending baseline appears in the spectral region of 1700-2800 cm À1 , which is attributed to the freeelectron conduction in PPy. 40 Previously, Menon et al have reported that longer conjugation length critically led to higher conductivity and experimentally the e®ective conjugation length was inversely proportional to the ratio of the peak areas at 1560 cm À1 and 1470 cm À1 (A 1560 /A 1470 Þ.…”