Hollow Self‐Doped Polyaniline Micro/Nanostructures: Microspheres, Aligned Pearls, and Nanotubes

Abstract

Hollow self‐doped polyaniline (SPAN) micro/nanostructures, such as hollow microspheres, aligned pearls, and nanotubes, have been synthesized by a one‐step chemical oxidation copolymerization of aniline (AN) and m‐aminobenzenesulfonic acid (SAN) using ammonium peroxydisulfate (APS) as the oxidant in aqueous solution. The process is facile and free of any template, surfactant, and external dopants. The shapes and sizes of the hollow SPAN micro/nanostructures can be controlled by adjusting the synthetic parameters, such as the molar ratios of AN and SAN, the concentrations of monomers, and the molar ratios of the monomer and APS. The formation of hollow SPAN micro/nanostructures is possibly related to the self‐assembly of SPAN oligomers at the early stage of the copolymerization reaction. The molecular structures of the SPAN micro/nanostructures were determined by FT‐IR spectroscopy, which reveales that SO groups are bonded to the aromatic rings in SPAN chains.magnified image

Electrodeposition of self-doped copolymers of aniline with aminobenzensulfonic acids on stainless steel. Morphological and electrochemical characterization

“…It was previously suggested that copolymerization occurs due to a promoting effect of An cation radicals, which are first formed and then attack ABSA to yield dimers [28]. Moreover, depending on the An:ABSA molar ratio, selfassembly of oligomers at early stages of copolymerization is also possible since ABSA has the function of surfactant, dopant, and a monomer/crosslinker [33]. The following acid-base equilibrium exists across the interface for the An:ABSA mixtures used in this study,…”

1H NMR Determination of the Doping Level of Doped Polyaniline

“…This group of 1 H NMR signals was initially observed in our previous work for further investigation of the fine structures and the structure‐property relations of the PANI samples,18 which were synthesized in the alkali‐guided system and this innovative synthesis method has attracted much attention of researchers and academics due to that it not only opens up a new way for the fabrication of PANI micro‐ and nanostructures, but also brings interesting insight for the mechanism discussion 19–25. The 1 H NMR detection is a common but important method to obtain some fine information about polymer.…”

Study on property of PANI/PET composite conductive fabric

“…During in situ polymerization, polyester fabric is introduced into acid solution with oxidant and aniline and a film made of polyaniline is formed on the surface of fabric. The in situ polymerization has many advantages, such as good spinnability, cost savings, good conductivity, and simple process (Cheng, 2002;Li, Zhang, Peng, Chen, Zhang, 2008;Marie Claude Bernard, 1999).…”