METHOD FOR MANUFACTURING SENSORS BASED ON SUBSTITUTED POLY(3,4-ETHYLENEDIOXYTHIOPHENE) Russian patent published in 2022 - IPC G01N27/30 

FIELD: chemistry.

SUBSTANCE: group of inventions relates to electroanalytical chemistry, namely, to electrochemical sensors based on conductive polymers for determining redox-active substances in liquid media, and also acts as the basis for creating biological sensors. Method for manufacturing sensors for determining redox-active substances in an aqueous medium includes synthesising derivatives of poly(3,4-ethylenedioxythiophene) on the surface of an electrode from monomers as a result of electropolymerisation in an aqueous solution of an acid while constantly increasing the monomer oxidation rate at a maximum anode potential. According to the invention, redox-active substances are determined in an aqueous medium using a sensor manufactured by the proposed method by immersing the sensor in the studied medium, recording a linear, cyclic, differential-pulse, or square-wave voltamperogram, and therefrom determining the current density of the peak of oxidation or reduction of the substance, followed by determining the concentration of the sought compound by means of a calibration graph prebuilt for the substance being determined.

EFFECT: possibility of producing electrochemical sensors with the potential difference of the peaks of oxidation and reduction of potassium hexacyanoferrate in an aqueous medium at a pH of 1.1 to 7.0 not exceeding 70 mV (scanning speed 40 mV/s), and sensitivity of determining redox-active substances in the mode of square-wave voltammetry not exceeding 0.2 A·M^-1·cm^-2.

8 cl, 4 dwg