Electrogenerated chemiluminescence of soliton waves in conjugated polymers

Ya Lan Chang, Rodrigo E. Palacios, Jiun-Tai Chen, Keith J. Stevenson, Song Guo, William M. Lackowski, Paul F. Barbara

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

(Chemical Equation Presented) We report the discovery of soliton-like electrogenerated chemiluminescence (ECL) waves in the electrochemical oxidation of thin films (15-250 nm) of the semiconducting conjugated polymer poly(9,9-dioctylfluorene-co-benzothiadiazole) (F8BT). The ECL "wave fronts" were visualized and imaged in space and time by optical emission microscopy and observed to freely propagate parallel to the plane of the electrode. The data reveal that the EC solitons are triggered by the flux of electrolytes into the polymer film at nanoscale "leaks" (or defects) and propagate by a highly nonlinear, positive-feedback kinetic mechanism involving EC oxidation, mass transport of electrolyte anions, and oxidation-induced swelling, all taking place within the conjugated polymer film. Several model systems with spatially distributed reaction "triggers" were studied to elucidate the mechanistic details of this complex oxidation process in polymer films.

Original languageEnglish
Pages (from-to)14166-14167
Number of pages2
JournalJournal of the American Chemical Society
Volume131
Issue number40
DOIs
StatePublished - 14 Oct 2009

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