Helical Polyaniline Nanofibers Induced by Chiral Dopants by a Polymerization Process

Abstract

Dopant‐induced helical conformations of polyaniline (PANI) nanofibers are presented. Right‐ and left‐handed helical nanofibers of conducting PANI are produced using respectively D‐ and L‐camphorsulfonic acid as the dopant, it is reported, as proved by the mirror‐image chiral dichroism spectra (see figure). The authors suggest a mechanism for the formation of nanofibrillar bundles of helical nanofibers.

Conducting polymer nanostructures and their application in biosensors

“…Using an aniline oligomer as a guiding template, PANI nanofibers with high optical activity were prepared in the presence of enantiomeric camphor sulfonic acid (CSA) [102]. Recently, Wei et al [103] prepared PANI nanostructures with two different morphologies, submicrometer tubes and helical nanofibers, by a polymerization process in the presence of chiral D-or L-CSA as the dopant. In this method, monomer-filled micelles acted as soft-templates in the formation of sub-micrometer tubes, while nanofibers were produced by preventing the overgrowth of PANI nanofibers by a high concentration of CSA.…”

Preparation of optical active polydiacetylene through gelating and the control of supramolecular chirality

“…In order to fabricate the chiral polymers, the general way is by using the chiral monomer unit or polymerized in certain chiral catalyst. Recently, the supramolecular control on the conformation of polymers by non-covalent bond proved to be an alternative way to obtain the optically active polymers [4][5][6][7]. Polydiacetylene (PDA), as one of the most investigated polymers, exhibited many potential applications as biosensors, pathogenic agents, and functional materials [8][9][10][11].…”

Single‐Handed Helical Carbonaceous Nanotubes: Preparation, Optical Activity, and Applications

“…Organic polypyrrole nanotubes have also been prepared using an external templating approach. [14] The handedness is determined by that of the templates. Helical polyaniline nanofibers have been prepared by adding chiral dopants.…”