A Facile Method for Synthesizing Cobalt Oxide Nanoparticles to Create a Highly Sensitive Non-Enzyme Glucose Sensor

Area of Science:

• Electrochemistry
• Materials Science
• Nanotechnology

Background:

• Development of non-enzymatic glucose sensors is crucial for diabetes management.
• Cobalt oxide materials offer potential for electrochemical sensing applications.
• Achieving high sensitivity and stability in non-enzymatic sensors remains a challenge.

Purpose of the Study:

• To develop a novel electrochemical non-enzymatic glucose sensor.
• To investigate the effect of electrochemical activation on cobalt oxide.
• To achieve enhanced glucose sensitivity and stability.

Main Methods:

• Chemical bath deposition for cobalt oxide synthesis.
• Electrochemical activation of the synthesized material.
• X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM) for material characterization.
• Electrochemical measurements for glucose sensing performance evaluation.

Main Results:

• Synthesized material transformed from Co2(OH)2(CO3) to Co3O4 nanoparticles upon electrochemical activation.
• Electrochemical activation changed nanorod structure to highly dispersed nanoparticles.
• Achieved high glucose sensitivity of 33,245 µA mM−1 cm−2 within 0–0.5 mM.
• Demonstrated a low detection limit (LOD) of 5 µM.
• The sensor maintained stability for over 12 months.

Conclusions:

• Electrochemical activation is a key step to enhance the sensitivity of cobalt oxide-based glucose sensors.
• The developed non-enzymatic glucose sensor exhibits excellent performance and stability.
• This approach offers a promising pathway for developing advanced electrochemical sensing devices.