Vesicles as a Multifunctional Microenvironment for Electrochemiluminescence Signal Amplification

Area of Science:

• Electrochemistry
• Materials Science
• Analytical Chemistry

Background:

• Vesicles offer an interface-rich microenvironment beneficial for reaction kinetics and intermediate stability.
• This property makes them promising for electrochemiluminescence (ECL) signal amplification applications.

Purpose of the Study:

• To investigate the use of multilamellar vesicles for modifying electrode surfaces to enhance ECL signal amplification.
• To explore the impact of vesicle-modified microenvironments on different ECL systems, including luminol/O2 and Ru(bpy)32+/TPrA.

Main Methods:

• Modification of electrode surfaces with multilamellar vesicles derived from sodium bis(2-ethylhexyl) sulfosuccinate (AOT).
• Evaluation of ECL performances for luminol/O2 and tris(2,2'-bipyridine)ruthenium(II) (Ru(bpy)32+)/tripropylamine (TPrA) systems using modified electrodes.
• Construction of dodecyl dimethyl(3-sulfopropyl) ammonium hydroxide inner salt (DSB)-based vesicles to confirm versatility.

Main Results:

• AOT vesicle modification significantly enhanced ECL performances for the luminol/O2 system in a neutral medium.
• The nanoscale vesicles improved electron transfer, reaction rates, luminescence efficiency, and superoxide anion radical stability.
• Enhanced ECL signals were also observed for the Ru(bpy)32+/TPrA system, and DSB-based vesicles confirmed the versatility of this approach.

Conclusions:

• Vesicle-modified microenvironments provide a versatile platform for improving the efficiency of various ECL systems.
• This work offers new insights into constructing microenvironments using ordered assemblies for ECL signal amplification.