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Nanoelectrode-emitter Spectral Overlap Amplifies Surface Enhanced Electrogenerated Chemiluminescence

Nanoelectrode-emitter Spectral Overlap Amplifies Surface Enhanced Electrogenerated Chemiluminescence

Thomas S Heiderscheit, Miranda J Gallagher, Rashad Baiyasi, Sean S E Collins, Seyyed Ali Hosseini Jebeli, Leonardo Scarabelli, Alexander Al-Zubeidi, Charlotte Flatebo, Wei-Shun Chang, Christy F Landes, etc.

J Chem Phys. 2019 Oct 14;151(14):144712.

PMID: 31615232

Abstract:

Electrogenerated chemiluminescence (ECL) is a promising technique for low concentration molecular detection. To improve the detection limit, plasmonic nanoparticles have been proposed as signal boosting antennas to amplify ECL. Previous ensemble studies have hinted that spectral overlap between the nanoparticle antenna and the ECL emitter may play a role in signal enhancement. Ensemble spectroscopy, however, cannot resolve heterogeneities arising from colloidal nanoparticle size and shape distributions, leading to an incomplete picture of the impact of spectral overlap. Here, we isolate the effect of nanoparticle-emitter spectral overlap for a model ECL system, coreaction of tris(2,2'-bipyridyl)dichlororuthenium(ii) hexahydrate and tripropylamine, at the single-particle level while minimizing other factors influencing ECL intensities. We found a 10-fold enhancement of ECL among 952 gold nanoparticles. This signal enhancement is attributed exclusively to spectral overlap between the nanoparticle and the emitter. Our study provides new mechanistic insight into plasmonic enhancement of ECL, creating opportunities for low concentration ECL sensing.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP50525274	Tris(2,2′-bipyridyl)dichlororuthenium(II) hexahydrate		50525-27-4	Price

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