Self-interconnecting Pt nanowire network electrode for electrochemical amperometric biosensor

Area of Science:

• Electrochemistry
• Materials Science
• Nanotechnology

Background:

• One-dimensional platinum nanostructures are crucial for developing stable and sensitive electrochemical sensors.
• Existing sensors often face limitations in sensitivity and long-term stability.

Purpose of the Study:

• To develop a self-interconnecting platinum nanowire network electrode (PtNNE) for highly sensitive and stable detection of hydrogen peroxide (H2O2) and glucose.
• To investigate the structural features of PtNNE and their impact on electrochemical sensing performance.

Main Methods:

• Fabrication of a free-standing PtNNE membrane composed of interconnected polycrystalline nanowires.
• Electrochemical characterization using amperometric measurements for H2O2 and glucose detection.
• Analysis of nanowire structure, including high-index facets and their role in electrocatalysis.

Main Results:

• The PtNNE exhibited ultrahigh sensitivity for H2O2 detection (1360 μA mM⁻¹ cm⁻²), attributed to high-index facets and an "electron freeway" transport model.
• A PtNNE-based glucose biosensor demonstrated outstanding sensitivity (114 μA mM⁻¹ cm⁻²), a low detection limit (1.5 μM), and a wide detection range (5 μM–30 mM).
• The PtNNE showed excellent stability and electrocatalytic activity for both analytes.

Conclusions:

• The self-interconnecting PtNNE is a promising platform for developing highly sensitive and stable electrochemical sensors.
• The unique nanostructure, featuring high-index facets and interconnected nanowires, significantly enhances sensor performance.
• PtNNE holds potential for applications in biosensing, particularly for oxidase-based detection systems.