Flexible Conductive Polymer Film Grafted with Azo-Moieties and Patterned by Light Illumination with Anisotropic Conductivity

0518757 - ÚJF 2020 RIV CH eng J - Journal Article
Kalachyova, Y. - Guselnikova, O. - Hnatowicz, Vladimír - Postnikov, P. - Švorčík, V. - Lyutakov, O.
Flexible Conductive Polymer Film Grafted with Azo-Moieties and Patterned by Light Illumination with Anisotropic Conductivity.
Polymers. Roč. 11, č. 11 (2019), č. článku 1856. E-ISSN 2073-4360
Institutional support: RVO:61389005
Keywords : PEDOT * PSS * flexible film * light pattering * electrical properties * resistance anisotropy
OECD category: Polymer science
Impact factor: 3.426, year: 2019
Method of publishing: Open access
https://doi.org/10.3390/polym11111856

In this work, we present the method for the creation of an anisotropic electric pattern on thin poly(3,4-ethylenedioxythiophene): polystyrene sulfonate (PEDOT:PSS) films through PSS grafting by azo-containing moieties followed by light-induced polymers redistribution. Thin PEDOT:PSS films were deposited on the flexible and biodegradable polylactic acid (PLLA) substrates. The light-sensitive azo-groups were grafted to PSS using the diazonium chemistry followed by annealing in methanol. Local illumination of azo-grafted PEDOT:PSS films through the lithographic mask led to the conversion of azo-moieties in Z-configuration and further creation of the lateral gradient of azo-isomers along the film surface. The concentration gradient led to the migration of PSS away from the illuminated area, increasing the PEDOT chains' concentration and the corresponding increase of local electrical conductivity in the illuminated place. Utilization of mask with linear pattern results in the appearance of conductive PEDOT-rich and non-conductive PSS-rich lines on the film surface, and final, lateral anisotropy of electric properties. Our work gives an optical lithography-based alternative to common methods for the creation of anisotropic electric properties, based on the spatial confinement of conductive polymer structures or their mechanical strains.
Permanent Link: http://hdl.handle.net/11104/0303822