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Wireless electrochemiluminescence at functionalised gold microparticles using 3D titanium electrode arrays.
Samantha F Douman1, David Collins2, Loanda R Cumba2
1National Centre for Sensor Research, School of Chemical Sciences, Dublin City University, FutureNeuro SFI Research Centre, Dublin 9, Ireland. Robert.Forster@dcu.ie and SensorLab (UWC Sensor Laboratories), Chemical Sciences Building, University of Western Cape Town, Robert Sobukwe Road, Bellville 7535, Cape, South Africa.
This study introduces wireless electrochemiluminescence using 3D printed titanium electrodes and gold microparticle emitters. Controlling gold particle surface charge via pH significantly boosts light intensity for enhanced sensing applications.
Area of Science:
- Electrochemistry
- Materials Science
- Nanotechnology
Background:
- Wireless electrochemiluminescence (ECL) offers potential for advanced sensing and imaging.
- Efficient ECL generation typically requires electrolytes and complex electrode setups.
Purpose of the Study:
- To develop a novel wireless electrochemiluminescence system.
- To investigate the use of 3D printed titanium electrodes and functionalized gold microparticles for ECL generation.
- To explore methods for enhancing ECL signal intensity.
Main Methods:
- Fabrication of interdigitated, 3D printed titanium arrays as feeder electrodes.
- Functionalization of gold microparticles with 11-mercaptoundecanoic acid.
- Generation of ECL using [Ru(bpy)3]2+ and tripropylamine as co-reactant.
- Utilizing COMSOL modeling and long exposure ECL imaging to map electric fields.
- Investigating the effect of solution pH on gold microparticle surface charge and ECL intensity.
Main Results:
- Successful generation of wireless electrochemiluminescence without added electrolyte.
- Demonstrated control over electric field distribution using 3D printed titanium array geometry.
- Observed a significant increase (over 10-fold) in ECL light intensity by tuning gold microparticle surface charge via pH.
- Correlated electric field distribution with ECL signal intensity.
Conclusions:
- The developed system enables wireless ECL generation with enhanced intensity.
- Controlling the surface charge of gold microparticles is a key strategy for optimizing ECL output.
- This approach holds promise for sensitive and versatile electrochemical sensing platforms.
