Interfacial Conductor-Modulated Low-Triggered Potential Electrochemiluminescence from Conjugated Polymers for...

Area of Science:

• Electrochemiluminescence (ECL)
• Nanomaterials
• Chemical Sensing

Background:

• Polyfluorenes (PFs) are promising ECL materials but suffer from high triggering potentials, limiting bioanalysis sensitivity.
• High triggering potentials in PFs cause electrochemical interference, reducing accuracy in biological detection.

Purpose of the Study:

• To develop a novel ECL platform with a lower triggering potential using polyfluorene derivatives.
• To improve the sensitivity and accuracy of ECL-based bioanalysis and pesticide detection.

Main Methods:

• In situ electrodeposition of poly(3,4-ethylenedioxythiophene) (PEDOT) onto poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(1,4-benzo-{2,1',3}-thiadiazole)] (PFBT) nanoparticles (NPs).
• Coupling PFBT NPs/PEDOT with localized hybridization chain reaction (LHCR) circuits for specific analyte detection.
• Investigating the effect of PEDOT on electron transfer and ECL triggering potential.

Main Results:

• PEDOT successfully modulated the ECL triggering potential of PFBT NPs, shifting it from +1.22 V to +0.78 V.
• The PFBT NPs/PEDOT platform achieved sensitive and specific ECL detection of malathion (MAL).
• A low limit of detection (LOD) of 22 fg/mL for malathion was obtained.

Conclusions:

• The developed interfacial conductor (PEDOT) effectively lowers the ECL triggering potential of PFs.
• The PFBT NPs/PEDOT platform offers a sensitive and low-interference solution for pesticide residue analysis.
• This approach provides a new strategy for designing low-potential ECL platforms for various analytical applications.