MXene-based composite electrodes for efficient electrochemical sensing of glucose by non-enzymatic method

A recently discovered 2D transition titanium metal carbides also called as MXenes (Ti3C2Tx)-based nanocomposite was prepared with Cu2O through wet precipitation technique, and these materials were further developed as the electrode for sensing glucose by chronoamperometry technique. The prepared MXene-Cu2O (Ti3C2Tx-Cu2O) nanocomposite was characterized by XRD, FTIR, UV-Vis spectroscopy, FESEM, EDAX, and Raman spectroscopy. Morphological studies of the composites revealed that the micro-octahedral shape of Cu2O is distributed on the surface of MXene with size larger than bare Cu2O. Further, the prepared composite material was fabricated as a sensing probe, and the electrochemical activities were examined by cyclic voltammetric analysis (CV) and chronoamperometric (CA) methods. From the CV and CA investigation, the current response was higher for the composite than the bare material (Cu2O & MXene) in the presence of glucose. The amperometric investigation of MXene-Cu2O composite for the detection of glucose shows a broad linear range (0.01-30 mM) with a sensitivity of 11.061/mAmM cm(-2) and a detection limit of 2.83 mM. Further, the fabricated sensor exhibits good selectivity with interfering species like NaCl, fructose, sucrose, urea, ascorbic acid, lactose, short response time, stability, good reproducibility, and compatibility with human serum sample. From the investigation, the prepared MXene-Cu2O composite is a good candidate for the direct detection of glucose molecules and is also well suitable for clinical diagnosis. (C)& nbsp;2022 Elsevier Ltd. All rights reserved.

Automated summary

A MXene-Cu2O (Ti3C2Tx-Cu2O) nanocomposite was prepared using the wet precipitation technique and developed as a glucose-sensing electrode. The composite showed higher current response and a broad linear range for the detection of glucose compared to bare Cu2O and MXene. The fabricated sensor exhibited good selectivity, short response time, stability, reproducibility, and compatibility with human serum samples. The MXene-Cu2O composite is a promising candidate for direct glucose detection and clinical diagnosis.