A highly sensitive morin sensor based on PEDT–Au/rGO nanocomposites modified glassy carbon electrode

Abstract

In this work, we fabricated a sensitive electrochemical sensor based on a PEDT-Au/reduced graphene oxide nanocomposites (PEDT-Au/rGO) modified glassy carbon electrode (PEDT-Au/rGO/GCE) for electrochemical determination of morin. A facile, effective and high-efficiency one-pot method was employed to synthesize the PEDT-Au/rGO nanocomposites. The morphology and structure of asprepared PEDT-Au/rGO nanocomposites were characterized by using a scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray spectroscopy (EDS), and its electrochemical characteristics were studied by EIS, CV and SWV. The PEDT-Au/rGO nanocomposites modified electrode exhibited excellent catalytic activities for morin oxidation, which was attributed to the synergistic catalytic effect that occurred at the interface of PEDT-Au and rGO layers. The effects of square wave voltammetry (SWV) parameters, accumulation time, accumulation potential and pH of the supporting electrolyte for morin were optimized. At the optimal experimental conditions, the PEDTAu/rGO/GCE presented a high sensitivity of 0.0083 mmol dm À3 and a wide linear range from 1 to 150 mmol dm À3 toward morin oxidation with satisfactory selectivity and stability.

Unique Host Matrix to Disperse Pd Nanoparticles for Electrochemical Sensing of Morin: Sustainable Engineering Approach

“…This result suggests oxidation of morin to be an adsorption-controlled electrochemical process . On the basis of the Laviron formula shown in eq for an irreversible adsorption system, − the number of electrons ( n ) transferred during the oxidation process can be calculated where F is Faraday’s constant, Q is equal to the peak area (0.0180971 m 2 ), ν is the scan rate (V/s), R is the gas constant (J/mol/K), and T is the experimental temperature (K). n was calculated to be around 2 indicating that two electrons were involved in the electron transfer.…”

“…This result suggests oxidation of morin to be an adsorptioncontrolled electrochemical process. 12 On the basis of the Laviron formula shown in eq 5 for an irreversible adsorption system, 52−54 the number of electrons (n) transferred during the oxidation process can be calculated 12…”

“…Also, these methods are cost-effective in terms of the equipment, time, and the amount of sample for detection. Electrochemical sensing can attain high sensitivity through signal amplification using suitable electrode modifications. ,− …”

Determination of morin on an electrochemically activated carbon-paste electrode

“…To determine morin, a number of voltammetric sensors were proposed. These sensors are based on a glassy carbon electrode modified with carboxylated nanotubes; 9 a composite of graphene oxide, poly-3,4-ethylenedioxythiophene, and gold nanoparticles; 10 1-butyl-3-methylimidazoliumhexafluorophosphat and chitosan; 11 poly(tetrafluroethylene)-deoxyribonucleate acid; 12 and vanadium pentoxide. 13 Sensors developed based on a mixture of carbon nanotubes and paraffin oil, 14 renewable pencil electrodes 15 , and carbon fiber paper electrode modified with poly(2,5-dimercapto-1,3,4-thiadiazole) 16 were also proposed (comparative characteristics of the proposed sensors are presented in Table 1).…”

Application of novel nanocomposite-modified electrodes for identifying rice wines of different brands

“…[1][2][3] In previous studies, glassy carbon electrode-modied chemically active materials showed high sensitivity to organic substances. [4][5][6] Metal nanoparticle materials have attracted much research interest because of their good electrical conductivity and excellent catalytic properties, and electrochemical sensor-modied metal nanoparticles worked well in the determination of DNA, proteins, neurotransmitters, phytohormones and organic pollutants. [7][8][9][10] However, these metal nanoparticles are unstable due to their high activity, easy oxidation and easy agglomeration due to van der Waals interactions.…”