A1 Journal article – refereed
Hot electron-induced electrogenerated luminescence of Tl(I) at disposable oxide-covered aluminum electrodes




List of Authors: Kulmala S, Ala-Kleme T, Vare L, Helin M, Lehtien T
Publisher: ELSEVIER SCIENCE BV
Publication year: 1999
Journal: Analytica Chimica Acta
Journal name in source: ANALYTICA CHIMICA ACTA
Journal acronym: ANAL CHIM ACTA
Volume number: 398
Issue number: 1
Number of pages: 7
ISSN: 0003-2670

Abstract
Cathodic pulse polarisation of oxide-covered aluminum electrodes in TI(I) solutions induce strong T1(I)-specific electrogenerated luminescence (EL). It is mainly regarded as electrochemiluminescence, induced by one-electron oxidation of cathodically produced thallium atoms in the close vicinity of the electrode surface; but solid state electroluminescence is also produced, especially, with thicker oxide films. Depending on the EL system applied, the oxidant in response of the excitation event is either a cathodically produced hydroxyl or sulfate radical, or an F+-centre of the thin oxide film, and the source of short-lived thallium atom colloids is a reduction of T1(I) ions by tunnel-emitted hot electrons and/or cathodically generated hydrated electrons. The present method allows the detection of TI(I) ions below nanomolar concentration level and provides linear log-log calibration graphs spanning several orders of magnitude of concentration of T1(I). (C) 1999 Elsevier Science B.V. All rights reserved.

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