Simultaneous detection of single attoliter droplet collisions by electrochemical and electrogenerated chemiluminescent responses

Jeffrey E. Dick, Christophe Renault, Byung Kwon Kim, Allen J. Bard

Research output: Contribution to journalArticlepeer-review

98 Scopus citations

Abstract

We provide evidence of single attoliter oil droplet collisions at the surface of an ultra-microelectrode (UME) by the observation of simultaneous electrochemical current transients (i-t curves) and electrogenerated chemiluminescent (ECL) transients in an oil/water emulsion. An emulsion system based on droplets of toluene and tri-n-propylamine (2:1 v/v) emulsified with an ionic liquid and suspended in an aqueous continuous phase was formed by ultrasonification. When an ECL luminophore, such as rubrene, is added to the emulsion droplet, stochastic events can be tracked by observing both the current blips from oxidation at the electrode surface and the ECL blips from the follow-up ECL reaction, which produces light. This report provides a means of studying fundamental aspects of electrochemistry using the attoliter oil droplet and offers complementary analytical techniques for analyzing discrete collision events, size distribution of emulsion systems, and individual droplet electroactivity.

Original languageEnglish
Pages (from-to)11859-11862
Number of pages4
JournalAngewandte Chemie - International Edition
Volume53
Issue number44
DOIs
StatePublished - 27 Oct 2014

Keywords

  • Chemiluminescence
  • Electrochemistry
  • Electron transfer
  • Emulsions
  • Spectroelectrochemistry

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