Surface passivation suppression in Zn-MOF for enhanced ECL sensing

Area of Science:

• Electrochemistry
• Materials Science
• Nanotechnology

Background:

• Zinc-based metal-organic frameworks (Zn-MOFs) show promise as electrochemiluminescence (ECL) luminophores due to their structural tunability.
• However, Zn-MOFs suffer from signal instability and electrode passivation during high-potential cycling due to electron accumulation.
• Developing stable and efficient ECL luminophores is crucial for advanced biosensing applications.

Purpose of the Study:

• To synthesize and evaluate a novel SnS2 quantum dots decorated Zn-MOF (SnS2 QDs@Zn-MOF) composite.
• To investigate the application of SnS2 QDs@Zn-MOF as an efficient luminophore for ECL biosensing.
• To develop a sensitive and stable ECL biosensor for dopamine detection.

Main Methods:

• Synthesis of SnS2 QDs@Zn-MOF composite material.
• Characterization of the synthesized material's structure and properties.
• Fabrication and testing of an ECL biosensor using SnS2 QDs@Zn-MOF for dopamine detection, utilizing dopaminequinone (DQ) for signal quenching.

Main Results:

• SnS2 QDs@Zn-MOF effectively suppressed electrode passivation by acting as electron acceptors.
• The developed biosensor demonstrated a broad linear range for dopamine detection (0.1 nM to 100 μM).
• An ultralow detection limit of 0.072 nM for dopamine was achieved, indicating high sensitivity.

Conclusions:

• The integration of SnS2 QDs into Zn-MOF significantly enhances ECL performance and stability.
• SnS2 QDs@Zn-MOF serves as a highly efficient luminophore for ECL biosensing.
• This work presents a promising strategy for developing high-performance ECL biosensors with improved stability and sensitivity.