Cu(I) Coordination Complex Precursor for Randomized CuO_x Microarray Loaded on Carbon Nanofiber with Excellent...

Area of Science:

• Electrochemistry
• Materials Science
• Nanotechnology

Background:

• Development of advanced electrode materials is crucial for sensitive and selective electrochemical detection.
• Carbon-based nanomaterials, like carbon nanofibers, offer excellent electrical conductivity and high surface area.
• Copper oxide nanomaterials are known for their electrocatalytic properties.

Purpose of the Study:

• To synthesize and characterize a novel copper oxide/carbon nanofiber (CuO_x/CNF) electrode.
• To evaluate the electrocatalytic activity of the CuO_x/CNF electrode for glucose oxidation.
• To optimize glucose detection using electrochemical techniques and a preconcentration step.

Main Methods:

• Synthesis of a homoleptic ionic Cu(I) coordination complex with 2,2'-biquinoline ligand (Cu(I)-C18).
• Modification of carbon nanofiber paste electrode with Cu(I)-C18 precursor.
• Electrochemical treatment using cyclic voltammetry (CV) to form CuO_x/CNF.
• Characterization using Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM).
• Electrochemical measurements including CV, square wave voltammetry (SWV), and multiple-pulsed amperometry (MPA).

Main Results:

• The CuO_x/CNF electrode demonstrated high electrocatalytic activity for glucose oxidation at +0.6 V and +1.2 V vs. Ag/AgCl.
• Optimized conditions using SWV with a 10-minute preconcentration step yielded the lowest limit of detection.
• Achieved the highest sensitivity reported to date for Cu-based glucose sensors (5419.77 µA·mM^-1·cm^-2 at +1.1 V vs. Ag/AgCl).

Conclusions:

• The developed CuO_x/CNF electrode exhibits excellent performance for glucose sensing.
• The combination of nanomaterials and electrochemical treatment provides a highly sensitive platform.
• This research offers a significant advancement in the field of electrochemical biosensors for glucose detection.