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Singling Out the Electrochemiluminescence Profile in Microelectrode Arrays.
Chiara Mariani1, Alessandro Fracassa1, Paolo Pastore2
1Department of Chemistry "Giacomo Ciamician", Alma Mater Studiorum - University of Bologna, Via. P. Gobetti 85, 40129 Bologna, Italy.
Chemical & Biomedical Imaging
|August 1, 2025
Summary
This study reveals how electrode material choice impacts electrochemiluminescence microscopy (ECLM) spatial emission. Gold substrates show broader emission than glassy carbon, enabling tailored bioanalytical assays.
Area of Science:
- Electrochemistry
- Microscopy
- Materials Science
Background:
- Electrochemical imaging techniques visualize reactions via optical signals.
- Electroluminescence microscopy (ECLM) offers powerful visualization of localized electrochemical reactivity.
Purpose of the Study:
- Investigate electrochemiluminescence (ECL) light emission spatial distribution.
- Explore the influence of electrode material (glassy carbon vs. gold) on ECL emission profiles.
- Understand how luminophore concentration affects ECL spatial distribution.
Main Methods:
- Fabrication of microelectrode arrays (MEAs) on glassy carbon (GC) and gold (Au) substrates using thermal nanoimprint lithography (TNIL).
- Utilized the Ru-(bpy)3^2+/TPrA ECL system for imaging.
- Employed finite element simulations to corroborate experimental findings.
Main Results:
- Gold substrates exhibited broader ECL spatial distribution (larger emitting layer thickness, ~7 μm) compared to GC (~4 μm).
- Decreasing luminophore concentration minimally affected GC emission profile but significantly narrowed Au emission, indicating a mechanism shift.
- ECL emission profiles are tunable via electrode material and luminophore concentration.
Conclusions:
- Electrode material significantly influences ECL emission spatial distribution and the underlying electrochemical mechanism.
- Precise control over the ECL emitting layer thickness (TEL) is achievable.
- Findings support the development of sensitive, spatially resolved bioanalytical assays, especially for bead-based detection.
