Highly Sensitive Temperature‐responsive Sensor Based on PS‐PDEA‐PS/C₆₀‐MWCNTs for Reversible Switch Detection of Catechol

Abstract

A new type of temperature‐responsive electrochemical sensor was constructed based on a glass carbon electrode modified by the composite containing temperature‐responsive polymer polystyrene‐poly N, N‐diethyl acrylamide‐polystyrene (PS‐PDEA‐PS) and fullerenes‐carboxylate multi‐walled carbon nanotubes (C60‐MWCNTs). The sensor was used for the electrochemical detection of catechol (CC). When the temperature is higher than the critical temperature (LCST) of PS‐PDEA‐PS, the electrochemical behavior of CC can be detected, which it is in the “on” state. When the temperature is lower than LCST, the composite modified film is in the “off” state and the electrochemical behavior of CC was not detected. Under the best experimental conditions, the sensor has a good detection range for catechol from 4.0 to 135.0 μM, with a LOD of 1.45 μM. In addition, the proposed sensor has good stability and reproducibility, and was successfully applied to the determination of catechol in real tap water.

Sensing platform for the highly sensitive detection of catechol based on composite coupling with conductive Ni3(HITP)2 and nanosilvers

“…The mechanism of electrochemical catalysis of catechol at the electrodes is shown in Scheme 1b. The electron transfer number n can be calculated according to the following equation: 34,35 Here, Q is the peak area of the CV curves at different scan rates ( v ). The value of n is calculated as 2, which is consistent with our earlier results.…”

“…Any hydroxylation or dimerization reactions are very slow because the catechol electrooxidation involves 1,4-Michael addition reactions, which use two electrons per molecule of catechol and convert it into its derivative o-benzoquinone. The mechanism of electrochemical catalysis of catechol at the electrodes is shown in Scheme 1b.The electron transfer number n can be calculated according to the following equation:34,35…”

Recent advances in electrochemical determination of anticancer drug 5-fluorouracil

“…Various multifunctional PNIPAM systems have revolutionized biomedical fields, such as controlled drug delivery, tissue engineering, and self-healing materials [ 37 ]. In the field of electroanalysis, thermo-sensitive conductive polymer forming a charged smart membrane by cycling “on-off” over the surface of the electrode allows for a “command interface” that selectively enhances or inhibits the electrochemical reaction [ 38 ].…”

Electrochemical Sensing Platforms of Dihydroxybenzene: Part 1 – Carbon Nanotubes, Graphene, and their Derivatives

“…Environmentally responsive electrochemical sensors have become an exciting development in electroanalytical chemistry to monitor changes in organic pollutant levels. Chen et al [116] . prepared a temperature‐sensitive, stable core‐shell macromolecule through covalent bonding between polystyrene (PS) and poly( N , N ‐dimethyl acrylamide) (PDEA).…”

“… PS‐PDEA‐PS/C 60 ‐MWCNTs interface‐based, temperature‐controlled reversible electrochemical response of CT. Reproduced with permission [116] . Copyright 2019, Wiley–VCH.…”