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Influence of Chemical and Structural Properties of Functionalized Polythiophene‐Based Layers on Electrochemical Sensing of Atrazine
Author(s) -
Lattach Youssef,
Garnier Francis,
Remita Samy
Publication year - 2012
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201100599
Subject(s) - polythiophene , cyclic voltammetry , detection limit , thiophene , conductive polymer , pedot:pss , fourier transform infrared spectroscopy , electrochemistry , polymer , materials science , chemical engineering , chemistry , analytical chemistry (journal) , organic chemistry , electrode , chromatography , engineering
Sensitive layers based on conducting homopolymer [poly(3,4‐ethylenedioxythiophene), denoted PEDOT] and copolymers [molecularly imprinted and non‐imprinted poly(EDOT‐ co ‐3‐thiophene acetic acid), denoted MICP and NICP, respectively] are electrosynthesized on gold substrates and used for the electrochemical detection of atrazine. These layers are characterized by cyclic voltammetry, ATR‐FTIR spectroscopy, optical profilemetry, and AFM microscopy in order to study the effect of the chemical functionalities and of the structural properties of these conducting polymers on the physical chemistry of the interaction with atrazine targets and with the aim to improve the sensitivity of the recognition process. In particular, due to the presence in their backbones of preshaped functionalized cavities which keep the molecular memory of the targets, MICP layers show remarkable sensitivity, a low detection limit (10 −9 mol L −1 ), and a large linear range of detection (10 −8 to 10 −4 mol L −1 ), as demonstrated by square‐wave voltammetry.