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New conducting inks based on poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) modified with an oxetane reagent

Príncipe, C. ; Silva, S. ; Matos, M. ; Santos, L. ; Morgado, J. ; Charas, A.

New conducting inks based on poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) modified with an oxetane reagent, Proc Sociedade Portuguesa de Química EuChemS Chemistry Congress (ECC8) ECC8, Lisbon, Portugal, Vol. , pp. - , August, 2022.

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Abstract
Printed electronics, making use of organic conducting inks, enables the easy and versatile fabrication of electronic circuits over mechanically flexible and stretchable surfaces. This represents a remarkable benefit for applications in the areas of wearable electronics and biomedical electronics. Poly(3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) is one of the most interesting conducting polymers due to being commercially available as aqueous dispersion that can be processed, as a conducting ink, by diverse solution deposition techniques, such as spin-coating, spray coating, ink-jet printing, etc. However, PEDOT:PSS still presents low conductivity and structural instability for some applications, for example, for performing as electrode interfacing aqueous/biologic media. In this communication, we present the study of new PEDOT:PSS aqueous formulations, containing an oxetane reagent, 3-oxetanemethanol, which result in printed PEDOT:PSS thin layers with enhanced electrical conductivity and better structural resistance to water. The improved properties were obtained for conducting films deposited by both spin-coating and ink-jet printing methods over glass and on flexible plastic (PET) substrates.