Meso-Cellular Silicate Foam-Modified Reduced Graphene Oxide with a Sandwich Structure for Enzymatic Immobilization...

Area of Science:

• Materials Science
• Electrochemistry
• Biotechnology

Background:

• Reduced graphene oxide (rGO) offers excellent conductivity but suffers from hydrophobicity.
• Meso-cellular silicate foam (MCF) provides a hydrophilic microenvironment and large mesopores but has poor conductivity.
• Integrating MCF and rGO can leverage their complementary properties for advanced applications.

Purpose of the Study:

• To design and synthesize a novel MCF@rGO composite material.
• To investigate the synergistic effects of MCF and rGO on enzyme immobilization and direct electron transfer (DET).
• To evaluate the bioelectrocatalytic performance of MCF@rGO-based biosensors for detecting hydrogen peroxide and glucose.

Main Methods:

• Synthesis of MCF@rGO composite using polyethylene oxide-polypropylene oxide-polyethylene oxide (P123) as a template.
• Characterization of the MCF@rGO structure and properties.
• Immobilization of enzymes (hemoglobin and glucose oxidase) onto the MCF@rGO composite.
• Electrochemical measurements to assess DET and bioelectrocatalytic activity using glassy carbon electrodes (GCE).

Main Results:

• A unique sandwich structure of MCF@rGO was successfully synthesized, enhancing hydrophilicity and enzyme bioactivity.
• The MCF@rGO composite significantly improved the direct electron transfer (DET) signals of immobilized enzymes (Hb and GOD) compared to individual components.
• MCF@rGO-based biosensors demonstrated excellent analytical performance for H2O2 and glucose detection, including high sensitivity, low detection limits, and successful application in human serum samples.

Conclusions:

• The integrated MCF@rGO composite exhibits synergistic effects, enhancing enzyme bioactivity and conductivity for improved biosensing.
• MCF@rGO provides a favorable microenvironment for enzymes, facilitating efficient DET and robust bioelectrocatalysis.
• This novel composite material holds great promise for developing high-performance electrochemical biosensors.