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Polymer Degradation and Stability

Polymer Degradation and Stability

IF: 6.29
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Stabilization of electronic properties of (1R)-(?)-10-camphorsulfonic acid doped polyaniline by UV irradiation

Published:1 July 2007 DOI: 10.1016/j.polymdegradstab.2007.02.021
Isao Sasaki, Ji?í Janata, Mira Josowicz

Abstract

Stability of electronic parameters of conducting polymers affects the overall performance of organic electronics. We show that UV light (254?nm) treatment of polyaniline (PANI) films, containing camphorsulfonic acid (CSA) as a dopant and cast from formic acid, decreases the film resistance and keeps their improved resistance stable for at least 4 months. It has been found that due to the different origins of these electronic properties, the resistance and work function of the PANI·CSA films are affected differently by the UV treatment. The long-term stability of the resistance is governed by morphological changes of the material. On the other hand the stability of the threshold voltage of the field-effect transistor (FET) which is an indirect measure of the work function, originates from the charge density equilibration at the PANI·CSA film/insulator interface. The FT-IR, UV–vis and circular dichroism data provide the evidence that after the UV treatment the polymer molecular structure remains intact, but some secondary structural re-arrangements of the PANI·CSA take place. These re-arrangements are resulting from the strong donor–acceptor interactions between the imine and/or amine groups of the PANI chains and the CO and SO3? groups of the doping CSA-anion. These interactions enhance significantly the mechanical rigidity of the PANI matrix. The increasing broad absorption band of the “free-carrier tail” in the FT-IR spectra correlates with the conductivity increase of the UV treated PANI·CSA film.

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Related products
Procduct Name CAS Molecular Formula Supplier Price
Formic acid 64-18-6 CH2O2 1231 suppliers $7.62-$5923.38
(1S)-(+)-Camphor-10-sulphonic acid 3144-16-9 C10H16O4S 699 suppliers $5.00-$1270.00
(1R)-(-)-10-Camphorsulfonic acid 35963-20-3 C10H16O4S 641 suppliers $6.00-$2055.90
Polyaniline 25233-30-1 C6H7N 150 suppliers $6.00-$1539.00
(+)-(1R)-4-methyl-cyclohex-3-enecarboxylic acid 121424-36-0 C8H12O2 5 suppliers Inquiry

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