Real-Time Electrochemical Sensing Enabled by Nanoconfined Hydrogels in Solid-State Arrayed Nanochannels.

Area of Science:

• Materials Science
• Nanotechnology
• Analytical Chemistry

Background:

• Nanochannel sensing offers potential for chemical and biological detection.
• Heterogeneity in nanochannel size and distribution limits signal stability and sensitivity for real-time applications.

Purpose of the Study:

• To develop a hybrid membrane for stable and sensitive real-time nanochannel sensing.
• To overcome limitations of current nanochannel sensing technologies.

Main Methods:

• Fabrication of a hybrid membrane by filling functional hydrogels into macroporous anodic aluminum oxide (AAO) nanochannels.
• Utilizing the AAO framework's confinement effect to restrict hydrogel swelling and stabilize ion transport.
• Employing functional groups in the hydrogel for selective analyte capture via electrostatic interaction.

Main Results:

• Achieved a rigid-flexible composite architecture with stable ion transport pathways.
• Demonstrated robust and efficient target binding through localized charge enrichment and modulated mass transport.
• Established a linear correlation between current decay rate and analyte concentration for quantitative detection.
• Enabled highly stable and interference-resistant detection of trace analytes in complex matrices.

Conclusions:

• The developed hybrid membrane platform significantly enhances stability and sensitivity in nanochannel sensing.
• This approach facilitates real-time, interference-resistant detection of trace analytes.
• The rigid-flexible composite architecture offers a promising solution for advanced chemical and biological detection systems.