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Highly Stable and Conductive PEDOT:PSS/Graphene Nanocomposites for Biosensor Application in Aqueous Medium

Abstract

In this article, we demonstrated the development of highly water-stable and conductive poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS)/graphene nanoplatelets (GNPs) [PPG] composites on fluorine-doped tin oxide (FTO) electrode for the detection of dopamine (DA) in the presence of ascorbic acid (AA) and uric acid (UA) in aqueous medium. The PPG was deposited on FTO by electrospray technique from the mixture solution of PEDOT:PSS and GNPs, which was subsequently treated with sulfuric acid (H2SO4, 98 %). Acid treatment enabled stabilisation of the GNPs on FTO in water, due to the removal of insulating and hydrophilic PSS (68 %) from the composites, and concurrently increased the conductivity (105 S/cm), owing to the presence of a high percentage of hydrophobic and conductive PEDOT, as well as strong π–π interaction between PEDOT and GNPs. The untreated PPG electrode exhibited low water stability of GNPs and low conductivity (23 S/cm). Accordingly, the acid-treated PPG/FTO electrode showed very high electrochemical stability, low charge transfer resistance (Rct) at the electrodeelectrolyte interface, and improved catalytic activity for the oxidation of DA in aqueous buffer solution with very high sensitivity. It showed sufficiently high anodic peak-to-peak potential separation (ΔEpa) between DA–AA (0.27 V) and DA–UA (0.11 V) for the interference-free detection of DA with the detection limit (S/N = 3) and sensitivity of ca. 105 nM and 27.7 μA/(μM•cm2), respectively.

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Publication details

The article was received on 06 Sep 2017, accepted on 06 Nov 2017 and first published on 09 Nov 2017


Article type: Paper
DOI: 10.1039/C7NJ03330C
Citation: New J. Chem., 2017, Accepted Manuscript
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    Highly Stable and Conductive PEDOT:PSS/Graphene Nanocomposites for Biosensor Application in Aqueous Medium

    D. Liu, Md. M. Rahman, C. Ge, J. Kim and J. Lee, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ03330C

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