Cu@C composite nanotube array and its application as an enzyme-free glucose sensor

Area of Science:

• Materials Science
• Nanotechnology
• Electrochemistry

Background:

• Developing advanced electrode materials is crucial for sensitive and efficient biosensors.
• Enzyme-free glucose sensors offer advantages over traditional enzyme-based sensors, but require highly effective electrode materials.

Purpose of the Study:

• To report a novel hydrothermal synthesis of copper-carbon (Cu@C) nanotube arrays.
• To demonstrate the efficacy of the synthesized Cu@C array as an electrode material for enzyme-free glucose sensing.

Main Methods:

• A hydrothermal method was employed using a carbon-coated zinc oxide (ZnO) nanorod array as a template.
• The ZnO template was dissolved in an alkaline environment, allowing copper particles to deposit and grow on the carbon surface.
• The carbon shell of the template was critical for preserving the nanotube array structure.

Main Results:

• A centimeter-scale Cu@C nanotube array was successfully synthesized for the first time.
• The Cu@C array exhibited high sensitivity (1200 µA mM⁻¹ cm⁻²) at a low applied potential (-0.2 V) for enzyme-free glucose detection.
• The synthesis method allows for morphology-reservation transformations with different carbon-containing templates.

Conclusions:

• The novel hydrothermal method provides a facile route to synthesize Cu@C composite nanotube arrays.
• The developed Cu@C nanotube array is a promising electrode material for high-performance enzyme-free glucose sensors.
• This work opens avenues for designing advanced electrode materials for electrochemical sensing applications.