Control of morphology and electromagnetic properties of polypyrrole synthesized by the template method

Abstract

This article presents a contribution to a better understanding of the effects of pH value on the morphology, conductivity, and reflection loss of polypyrrole (PPy) prepared at different pH values using indigo carmine (IC) as the synthesis template. The results indicate that the morphology of PPy changes from spiral rods to nonspiral rods, then to particles, which is attributed to the gradual morphological change of IC micelle templates from prismatic structure to rugby-like structure, and finally to spherical structure. Further study demonstrates that the conductivity of PPy decreases with the gradual decrease of the pH value, as a result of gradually increased contact resistance and the degree of electron delocalization. With the decrease of the pH value, the maximum reflection loss of PPy gradually increases and the corresponding loss peak moves to higher frequency points simultaneously.

Morphology control of conducting polypyrrole nanostructures via operational conditions in the emulsion polymerization

“…In this regard, dispersions of PPy nanoparticles can be used in molecular electronics and microelectronic circuits whereas nanosized particles lead to better processability of PPy. A variety of methods to produce ICP nanomaterials have been reported such as in situ chemical oxidative polymerization, electrochemical polymerization, templates, electrospinning, interfacial polymerization, self‐assembly, seeding growth, oligomer‐assisted polymerization, and emulsion polymerization . Among these approaches, emulsion polymerization technique has attracted considerable interest due to its procedure simplicity .…”

Structural characterization, electrical properties and gas sensing applications of polypyrrole/Cu-Al2O3 hybrid nanocomposites

“…Polyaniline (PANI), polypyrrole (PPy), polyindole (PIN), and polythiophene (PT) are important class of conducting polymers. 1 –4 Among them, an interesting choice to the conducting polymer is PPy due to its unchallenging mode of synthesis (when compared with PANI, PIN, and PT), slender weight, and enormous biocompatibility as well as environmental stability. 5,6 However, the deficiency of the mechanical, electrical, and thermal stabilities makes PPy unhandy for many industrial applications.…”

Recent Advances in Nanostructured Conducting Polymers: from Synthesis to Practical Applications

“…In addition, insoluble complex templates with lamellar mesostructures were formed with a noble metal compound and a cationic surfactant such as CTAB [70]. Other surfactants that have been investigated include indigo carmine [71] and Pluronic ® F127 [72].…”

“…In addition, insoluble complex templates with lamellar mesostructures were formed with a noble metal compound and a cationic surfactant such as CTAB [70]. Other surfactants that have been investigated include indigo carmine [71] and Pluronic ® F127 [72]. As a possible milestone for industrial fabrication of colloidal crystal templates, Choi et al [61] demonstrated an efficient method to fabricate large-area two-dimensional (2D) colloidal crystals as a template for nanopatterning of CPs; this method involves the electrophoretic deposition of negatively charged polystyrene colloidal particles and the assembly of the colloidal particles to 2D colloidal crystals at the air-water interface.…”