RETRACTED: Advanced Binder-Free Electrode Based on CuCo2O4 Nanowires Coated with Polypyrrole Layer as a High-Performance Nonenzymatic Glucose Sensing Platform

Abstract

In this work, the CuCo2O4 nanowires (CuCo2O4 NWs) were grown on carbon cloth electrode (CCE) and then coated with polypyrrole (pPy) layer (CuCo2O4 NWs-pPy@CCE). The morphology and structure characterization of as-prepared CuCo2O4 NWs-pPy@CCE were carried out using Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), field-emission scanning electron microscope (FESEM), thermogravimetric analysis (TGA), and transmission electron microscope (TEM). The CuCo2O4 NWs-pPy@CCE was applied directly as an electrocatalyst toward nonenzymatic glucose oxidation. Due to the advantages of this 3D structure, it offer high availability to the analyte/electrolyte, abundant electrochemical-active sites, and high stability and conductivity. As a glucose sensor, the CuCo2O4 NWs-pPy@CCE shows wide linear range (0.01 to 21.3 mM), excellent sensitivity (4.41 μA μM−1 cm−2), good selectivity, low detection limit (0.2 μM), and rapid response time (<1 s) toward glucose detection. Furthermore, the designed sensor shows a great ability in detection of glucose in biological real samples.

RETRACTED: Hatshan et al. Advanced Binder-Free Electrode Based on CuCo2O4 Nanowires Coated with Polypyrrole Layer as a High-Performance Nonenzymatic Glucose Sensing Platform. Coatings 2021, 11, 1462

“…The Coatings Editorial Office retracts the article entitled "Advanced Binder-Free Electrode Based on CuCo 2 O 4 Nanowires Coated with a Polypyrrole Layer as a High-Performance Nonenzymatic Glucose Sensing Platform" [1], cited above.…”

“…Following the publication, concerns were brought to the attention of the Editorial Office regarding concerns relating to the relevancy of references and authorship in this publication [1].…”

“…Furthermore, following communications with the authorship group, the Editorial Office was unable to verify the accuracy of the originally listed authorship list. As a result, the Editorial Board has lost confidence in the integrity of the findings and decided to retract this publication [1], as per MDPI's retraction policy (https://www.mdpi.com/ethics# _bookmark30 (accessed on 8 May 2024)) and in line with the Committee on Publication Ethics retraction guidelines (https://publicationethics.org/retraction-guidelines (accessed on 8 May 2024)).…”