Electrosynthesis of polypyrrole nano/micro structures using an electrogenerated oriented polypyrrole nanowire array as framework

Abstract

of polypyrrole nano/micro structures using an electrogenerated oriented polypyrrole nanowire array as framework. Electrochimica Acta, Elsevier, 2018Elsevier, , 268, pp.66 -72. <10.1016Elsevier, /j.electacta.2018.02.092>. <hal-01745694> M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT AbstractThe purpose of this paper is to show that it is possible to increase the diameter and the length of the nanostructures of a framework formed of oriented polypyrrole nanowires that has been prepared by a templateless electrochemical method based on the use of a pyrrole solution containing a high concentration of weak-acid anion and a low concentration of non-acidic anion. The dimensions of the initial nanowires are increased by performing an additional electrosynthesis in a 'classical' monomer solution. Depending on the polarization time of this last synthesis (a few tens of seconds), wires with various diameters, from one hundred up to several hundred nanometers, are obtained. In addition to the variation of the nanowire size, these findings confirm, as outlined in the reaction mechanism we have proposed, that the base of the nanowires is surrounded by a thin non-conductive polymer i.e. by an overoxidized polypyrrole film. Actually this paper shows a proof-of-concept. Indeed one can imagine that the second polymeric electrodeposit could be performed using an organic monomer solution, using functionalized pyrrole monomer to fabricate a biosensor having large specific area, and/or using anions which could be drugs.

Templateless Electrodeposition of Conducting Polymer Nanotubes on Mesh Substrates

“…In literature, the electropolymerization of pyrrole in water (H 2 O) has been extensively studied. [15][16][17][18][19][20][21][22][23][24][25] The interest to use water is the possibility to release different gases (O 2 and/or H 2 ) depending on the polymerization method, for example, by cyclic voltammetry and at constant potential. However, a surfactant is necessary to stabilize the gas bubbles and induce the polymer growth around them.…”

“…[15][16][17][18][19][20] Other works also showed the possibility to release O 2 bubbles from H 2 O at constant potential. [21][22][23][24][25] Very recently, by a judicious choice in monomer and H 2 O content, the templateless electropolymerization process in organic solvent such as dichloromethane (CH 2 Cl 2 ) has been proposed as an efficient method to prepare extremely well-controlled porous nanostructures such as vertically aligned nanotubes. [26][27][28][29][30][31][32][33] Trace H 2 O naturally present in solution are responsible for the formation of gas bubbles (O 2 and/or H 2 ).…”

“…[ 15–20 ] Other works also showed the possibility to release O 2 bubbles from H 2 O at constant potential. [ 21–25 ]…”

Templateless Electropolymerization for Controlled Growth of Polymeric Nanotubes on Micropatterned Surfaces

“…Gas bubbles (soft template) released during the process ( in‐situ ) are the basis of the nanotube growth inducing the formation of porous structures. In literature, the electropolymerization of pyrrole directly in water (H 2 O) has been extensively studied . Depending on the polymerization range, different gases can be released from H 2 O: O 2 during the anodic scans and H 2 during the cathodic scans, if the deposition is performed for example by cyclic voltammetry.…”

“…In literature, the electropolymerization of pyrrole directly in water (H 2 O) has been extensively studied. [11][12][13][14][15][16] Depending on the polymerization range, different gases can be released from H 2 O: O 2 during the anodic scans and H 2 during the cathodic scans, if the deposition is performed for example by cyclic voltammetry. Different structures such as ordered nanotubes and nanocups have been reported.…”