Ultrasensitive voltammetric determination of catechol at a gold atomic cluster/poly(3,4-ethylenedioxythiophene) nanocomposite electrode

Abstract

A novel gold atomic cluster-poly(3,4-ethylenedioxythiophene) (AuAC/PEDOT/Au) nanocomposite modified gold electrode has been designed for the trace level sensing of catechol. The addition of copper(II) enhanced the electro-catalytic oxidation of catechol via the formation of copper(I). The electrochemically synthesized PEDOT/Au and the AuAC/PEDOT/Au hybrid films were characterized by electrochemical and morphological methods. Under optimal conditions the nanocomposite modified electrode offers a wider calibration range of 1 × 10(-4) to 10 μM with a lowest detection limit of 6.3 pM for catechol. Moreover, the developed electrochemical sensor exhibited good selectivity and acceptable reproducibility (1.23% for 1 nM of catechol) and could be used for the routine detection and quantification of catechol in natural water samples. To gain a better understanding of such an excellent sensor performance achieved with this electrode, studies were undertaken to pinpoint electrode kinetics of charge transfer processes.

A reagentless non-enzymatic hydrogen peroxide sensor presented using electrochemically reduced graphene oxide modified glassy carbon electrode

“…The figure indicates that H 2 O 2 reduction reaction is diffusion controlled electron transfer process and apparent rate constant (k) is determined by the following equation (4) [53].…”

Non-Enzymatic Selective Determination of Catechol Using Copper Microparticles Modified Polypyrrole Coated Glassy Carbon Electrodes

“…It is of importance to mention here that the mechanism of electrocatalytic oxidation of CC in the presence of Cu (II) ions can be considered analogous to the homogeneous solution phase catalysis mechanism. 65,[67][68][69] Selective non-enzymatic sensing of CC.-The non-enzymatic estimation of CC at Cu-PPy/GCE was studied using Differential Pulse Voltammetry and Chronoamperometry.…”

A novel Laccase Biosensor based on Laccase immobilized Graphene-Cellulose Microfiber Composite modified Screen-Printed Carbon Electrode for Sensitive Determination of Catechol

“…Moreover, the phenolic compounds are highly toxic organics, has been widely used in different industrial products and can easily accumulate in the environment and eco system23. Among different phenolic compounds, catechol (CC) is an ortho isomer of benzenediols, has classified as a periodic toxic pollutant by the US Environmental Protection Agency and the European Union due to its poor biodegradability and high toxicity on human health and eco system45. Therefore, a simple and real time detection of trace levels of CC in environmental samples is of great importance.…”