Conductive and self-healing hydrogel for flexible electrochemiluminescence sensor

Area of Science:

• Materials Science
• Analytical Chemistry
• Biomedical Engineering

Background:

• Flexible sensors are crucial for advanced bioanalytical applications.
• Developing self-healing materials enhances sensor durability and longevity.
• Electrochemiluminescence (ECL) offers high sensitivity for detecting analytes.

Purpose of the Study:

• To construct a flexible, self-healing electrochemiluminescence hydrogel sensor.
• To immobilize ionic liquid and luminophore within a self-healing hydrogel matrix.
• To evaluate the sensor's performance in detecting hydrogen peroxide (H2O2).

Main Methods:

• Fabrication of a transparent, self-healing oxidized sodium alginate/hydrazide polyethylene glycol (OSA/PEG-DH) hydrogel using dynamic covalent acylhydrazone bonds.
• Incorporation of 4-amino-DL-phenylalanine for rapid gelation and self-healing.
• Simultaneous immobilization of an ionic liquid (IL) and N-(aminobutyl)-N-(ethylisoluminol) (ABEI) within the hydrogel matrix.
• Utilizing the ABEI/IL/OSA/PEG-DH hydrogel as a semi-solid electrolyte for ECL sensing.

Main Results:

• The developed hydrogel exhibited excellent self-healing properties, restoring ECL signal within 20 minutes after damage.
• The flexible ECL sensor demonstrated high accuracy in analyzing complex serum samples.
• The sensor effectively detected H2O2, leveraging its role as a coreactant for ABEI.

Conclusions:

• A robust and self-healing flexible ECL hydrogel sensor was successfully created.
• The sensor shows significant potential for sensitive and reliable bioanalytical applications.
• This work advances the development of advanced hydrogel-based sensing platforms.