Abstract
The efficiency of the high-energy electrogenerated chemiluminescence (ECL) tris(2,2′-bipyridine)ruthenium(II)/oxalate reaction was determined in the presence of citrate-coated gold nanoparticle (AuNPs) aqueous solutions. The ECL efficiency (ΦECL) for this reaction is enhanced by the addition of increasing amounts of AuNPs, followed by a sharp decrease when [AuNPs] is higher than 1.6 × 10–8 M. To explain this ΦECL/[AuNPs] trend, photoluminescent (PL) quenching, transmission electronic microscopy (TEM), and energy dispersive X-ray spectroscopy (EDS) measurements were also performed as well as redox potentials for the [Ru(bpy)3]3+/2+ couple. Two facts were noteworthy: First, there is an increase in ΦECL, which accompanies an energy transfer effect by coupling between the Ru(II) complex ECL emission band and the AuNPs surface plasmon resonance (SPR)-induced band. This coupling, which we have called the ECL-SPR effect, enabled the quantifying of a coefficient (KECL-SPR, ECL-SPR effectiveness) for the improved ...
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