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Solid-State rGO-PEDOT:PSS Transducing Material for Cost-Effective Enzymatic Sensing.

Firdaus Abd-Wahab1, Habibah Farhana Abdul Guthoos2, Wan Wardatul Amani Wan Salim3

  • 1Department of Biotechnology Engineering, Faculty of Engineering, International Islamic University Malaysia, Gombak 50728, Kuala Lumpur, Malaysia. firdaus@iium.edu.my.

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|March 6, 2019
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Summary

This study explores reduced graphene oxide-poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (rGO-PEDOT:PSS) as a transducer material for sensing devices. The composite shows enhanced electrochemical properties and sensitivity for glucose detection.

Keywords:
PEDOT:PSScyclic voltammetryelectrochemical reductionglucose oxidasereduced graphene oxidescreen-printed carbon electrodesurface characterization

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Biosensing

Background:

  • Sensing device performance relies heavily on transducer material characteristics.
  • Morphological and electrochemical properties are crucial for signal transduction.

Purpose of the Study:

  • To investigate the morphological and electrochemical properties of reduced graphene oxide interspersed with poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (rGO-PEDOT:PSS).
  • To evaluate the rGO-PEDOT:PSS composite as a transducer material for glucose detection on screen-printed carbon electrodes.

Main Methods:

  • Electron microscopy, Raman spectroscopy, and X-ray diffraction (XRD) were used to analyze material morphology and structure.
  • Cyclic voltammetry was employed to assess electrochemical behavior.
  • The composite material blended with glucose oxidase was tested for glucose detection sensitivity and limit.

Main Results:

  • PEDOT:PSS was observed to be interspersed between rGO layers, with PEDOT blending into the graphene structure via π-π interactions.
  • The rGO-PEDOT:PSS composite exhibited improved electrochemical behavior, with a higher peak current (1.184 mA) compared to rGO alone (0.522 mA).
  • The glucose sensor demonstrated a sensitivity of 57.3 µA/(mM·cm²) and a detection limit of 86.8 µM.

Conclusions:

  • The rGO-PEDOT:PSS composite material enhances the electrochemical performance of sensing devices.
  • This composite shows significant potential as a transducer material for sensitive and reliable glucose detection.