Constructing a TiO₂/PDA core/shell nanorod array electrode as a highly sensitive and stable photoelectrochemical...

Area of Science:

• Materials Science
• Electrochemistry
• Biosensors

Background:

• Developing stable and sensitive photoelectrochemical (PEC) glucose biosensors is crucial for effective disease monitoring.
• Existing biosensors often face challenges with stability and sensitivity, limiting their practical application.

Purpose of the Study:

• To design and fabricate a highly stable and sensitive enzymatic glucose PEC biosensor.
• To investigate the performance of a TiO2/PDA core/shell nanorod array structure for glucose detection.

Main Methods:

• Fabrication of TiO2 nanorod arrays as the core structure.
• Coating the TiO2 nanorods with a polydopamine (PDA) shell to create a core/shell nanostructure.
• Utilizing the core/shell nanostructures in an enzymatic glucose photoelectrochemical biosensor.

Main Results:

• The TiO2/PDA core/shell nanorod arrays demonstrated enhanced charge transportation and light absorption.
• The PDA shell effectively stabilized enzyme performance by preventing decomposition.
• Achieved ultrahigh sensitivity of 57.72 μA mM⁻¹ cm⁻², a low detection limit of 0.0285 mM, and a wide linear range.

Conclusions:

• The developed TiO2/PDA core/shell nanorod array structure offers a promising strategy for constructing stable and sensitive glucose PEC biosensors.
• This approach provides a viable method for improving the performance of biosensors through inorganic/organic core/shell architectures.