The Fundamentals of Real‐Time Surface Plasmon Resonance/Electrogenerated Chemiluminescence

Abstract

We report the integration of surface plasmon resonance (SPR), cyclic voltammetry and electrochemiluminescence (ECL) responses to survey the interfacial adsorption and energy transfer processes involved in ECL on a plasmonic substrate. It was observed that a Tween 80/tripropylamine nonionic layer formed on the gold electrode of the SPR sensor, while enhancing the ECL emission process, affects the electron transfer process to the luminophore, Ru(bpy)32+, which in turn has an impact on the plasmon resonance. Concomitantly, the surface plasmon modulated the ECL intensity, which decreased by about 40 %, due to an interaction between the excited state of Ru(bpy)32+ and the plasmon. This occurred only when the plasmon was excited, demonstrating that the optically excited surface plasmon leads to lower plasmon‐mediated luminescence and that the plasmon interacts with the excited state of Ru(bpy)32+ within a very thin layer.

Electrochemical plasmonic optical fiber probe for real-time insight into coreactant electrochemiluminescence

“…However, it does not return to the initial value at 0 V, remaining ~ 1 nm longer. Similar observations have been reported previously, [39,51] In the presence of 5.0 mmol L -1 TPrA, the cyclic ESPR curve (Figure 4b, red curve) is similar to the shape of the aforementioned curve (blue curve), but with a blue-shift of ~ 0.7 nm. This reflects the dielectric changes on the probe/solution interface, due to addition of TPrA.…”

“…The coreactant-based / tripropylamine (TPrA) electrochemiluminescence (ECL) model system was therefore chosen for this study to unravel electrochemically-induced realtime interfacial information, since this ECL system is increasingly employed for clinical assay analysis. [35][36][37] However, the underlying ECL mechanism is an active area of investigation, [38,39] with numerical simulations commonly employed to verify the mechanistic hypotheses [40,41] and lacking real-time interfacial information. The newly developed flow injection electrochemical device will be first employed to produce ECL results that are then compared to the reported data in literature, to validate the electrochemical-optical performance.…”

Site-selective heat boosting electrochemiluminescence for single cell imaging

“…Nevertheless, we could only observe that the laser bright spot weakened with increasing voltage or stayed unchangeable with change in the voltage (the lower panel in Fig. S4 †), probably correlated with the effect of electrode electron loss process on laser intensity 35 and the destruction on the electrode surface. Moreover, the FWHM collected here was 2.524 mm, which was smaller than that in the ECL electrolyte and considered as the size of the laser spot itself.…”