Electrochemical synthesis of polypyrrole films doped with iodine by luminescent discharge plasma
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.25
Electrochemical synthesis of polypyrrole films doped with iodine by luminescent discharge plasma C. Hernández-Tenorio1, M. Villanueva-Castañeda1, J.N. Balderas-Gutiérrez1, H. MorenoSaavedra1 and J. H. Pacheco-Sánchez1 1 Tecnológico Nacional de México/Instituto Tecnológico de Toluca, Av. Tecnológico s/n, Agrícola Bellavista, Metepec, C. P. 52149, Edo. de México, México.
ABSTRACT
This work presents a study about synthesis of polypyrrole films electrochemically doped with iodine by luminescent discharge plasma in aqueous sodium sulfate solution, and its structural, morphological and electrical characterization. The synthesis is carried out at atmospheric pressure with square pulse from -1.06 to 1.16 V for 120 minutes. Doping times of the films are 10, 30 and 50 minutes. The films have thicknesses of 6, 12.7, 20.32 and 25.4 μm, and linear growth trend according to the time exposure of their synthesis. The main chemical groups exhibited in the films are C-H, N-H and CH2I, which are characteristics of film doped with Iodine. The electrical conductivity calculated of polypyrrole films is in the range 10-5-10-3 S/cm, and its activation energy is between 0.052 and 1.77 eV.
INTRODUCTION Nowadays, polymeric organic conductors have arisen interest in materials engineering for their varied applications to control thermal stability, optical properties, electrical conductivity, and catalytic activity, among others [1]. This let to establish a better control in the conductivity with variation of temperature, in a way that allows to design electronic devices in which electrical signals can be kept within an acceptable temperature range. Polymer structure such as pyrrole permits the formation of π-type bond, enabling greater mobility of electric charges within polymer chains. Doping of materials allow to alter the forbidden energy band, and this is seen in generation of electrons or holes, as free energy carriers. These makes possible to improve conductive characteristics of the polymer chains [2]. Then, polymers emerge as promising materials for manufacture of fuel cells, and solar cells, among others [3]. PPy presents high electrical conductivity, thermal stability, and resistance to oxidation. This can be formed
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from aqueous solutions in organic solvents [4]. It can also be obtained by either chemical or electrochemical polymerization, by considering that electropolymerization provides better thickness control [5] and morphology of the films, as shown in this work. We also present the process to obtain PPy films inside of I2-doped by plasma polymerization using RF luminescent discharge plasma in aqueous solution. We study the influence of the dopant, the synthesis parameters and electrical conductive properties. Both P
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