Construction of amperometric biosensor modified with conducting polymer/carbon dots for the analysis of catechol

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Yaşa M., Deniz A., Forough M., Yildirim E., Cetinkol O. P., Arslan Udum Y., ...More

JOURNAL OF POLYMER SCIENCE, vol.58, pp.3336-3348, 2020 (SCI-Expanded)

  • Publication Type: Article / Article
  • Volume: 58
  • Publication Date: 2020
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.3336-3348
  • Middle East Technical University Affiliated: Yes


Phenolic compounds used in food industries and pesticide industry, are environmentally

toxic and pollute the rivers and ground water. For that reason, detection

of phenolic compounds such as catechol by using simple, efficient and

cost-effective devices have been becoming increasingly popular. In this study, a

suitable and a novel matrix was composed using a novel conjugated

polymer, namely poly[1-(5-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b']

dithiophen-2-yl)furan-2-yl)-5-(2-ethylhexyl)-3-(furan-2-yl)-4H thieno[3,4-c]pyrrole-

4,6(5H)-dione] (PFTBDT) and carbon dots (CDs) to detect catechol. PFTBDT and

CDs were synthesized and the optoelectronic properties of PFTBDT were investigated

via electrochemical and spectroelectrochemical studies. Laccase enzyme

was immobilized onto the constructed film matrix on the graphite electrode.

The proposed biosensor was found to have a low detection limit (1.23 μM) and a

high sensitivity (737.44 μA/−2) with a linear range of 1.25–175 μM.

Finally, the applicability of the proposed enzymatic biosensor was evaluated in a

tap water sample and a satisfactory recovery (96–104%) was obtained for catechol