MXene improves the stability and electrochemical performance of electropolymerized PEDOT films
El Demellawi, Jehad K.
Zhang, Yi Zhou
KAUST DepartmentBiological and Environmental Sciences and Engineering (BESE) Division
Material Science and Engineering Program
Material Science and Engineering
Physical Science and Engineering (PSE) Division
KAUST Grant NumberOSR-2018-CRG7-3709
Permanent link to this recordhttp://hdl.handle.net/10754/666626
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AbstractPoly(3,4-ethylenedioxythiophene) (PEDOT) doped with poly(styrene sulfonate) (PSS) is the most commonly used conducting polymer in organic bioelectronics. However, electrochemical capacitances exceeding the current state-of-the-art are required for enhanced transduction and stimulation of biological signals. The long-term stability of conducting polymer films during device operation and storage in aqueous environments remains a challenge for routine applications. In this work, we electrochemically synthesize a PEDOT composite comprising the water dispersible two-dimensional conducting material Ti3C2 MXene. We find that incorporating MXene as a co-dopant along with PSS leads to PEDOT:PSS:MXene films with remarkably high volumetric capacitance (607.0 ± 85.3 F cm−3) and stability (capacity retention = 78.44% ± 1.75% over 500 cycles), outperforming single dopant-comprising PEDOT films, i.e., PEDOT:PSS and PEDOT:MXene electropolymerized under the same conditions on identical surfaces. The stability of microfabricated PEDOT:PSS:MXene electrodes is evaluated under different conditions, i.e., when the films are exposed to sonication (∼100% retention over 6 min), upon immersion in cell culture media for 14 days (∆|Z| = 2.13%), as well as after continuous electrical stimulation. Furthermore, we demonstrate the use of a PEDOT:PSS:MXene electrode as an electrochemical sensor for sensitive detection of dopamine (DA). The sensor exhibited an enhanced electrocatalytic activity toward DA in a linear range from 1 μM to 100 μM validated in mixtures containing common interferents such as ascorbic acid and uric acid. PEDOT:PSS:MXene composite is easily formed on conductive substrates with various geometries and can serve as a high performance conducting interface for chronic biochemical sensing or stimulation applications.
CitationWustoni, S., Saleh, A., El-Demellawi, J. K., Koklu, A., Hama, A., Druet, V., … Inal, S. (2020). MXene improves the stability and electrochemical performance of electropolymerized PEDOT films. APL Materials, 8(12), 121105. doi:10.1063/5.0023187
SponsorsThis work was supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under Award Nos. OSR-2018-CRG7-3709 and IAFREI/1/4229-01.
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