Electrogenerated chemiluminescence induced by sequential hot electron and hole injection into aqueous electrolyte solution
| Autor: | Markus Håkansson, Kalle Salminen, Päivi Kuosmanen, Matti Pusa, Oskari Kulmala, Sakari Kulmala |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Luminescence
Radical Inorganic chemistry Analytical chemistry Oxide Electrons 02 engineering and technology 01 natural sciences Biochemistry Analytical Chemistry chemistry.chemical_compound Electrolytes Limit of Detection 0103 physical sciences Environmental Chemistry Electrochemiluminescence Electron injection 010306 general physics HECL Electrodes ta116 Hot electron-induced electrochemiluminescence Spectroscopy ECL Aqueous solution Hole injection Tb(III) chelates Water Free Radical Scavengers 021001 nanoscience & nanotechnology Anode Solutions Electrogenerated chemiluminescence chemistry Electrode Radiolysis 0210 nano-technology Excitation |
| Zdroj: | ANALYTICA CHIMICA ACTA. 912:24-31 |
| ISSN: | 0003-2670 |
| Popis: | Hole injection into aqueous electrolyte solution is proposed to occur when oxide-coated aluminum electrode is anodically pulse-polarized by a voltage pulse train containing sufficiently high-voltage anodic pulses. The effects of anodic pulses are studied by using an aromatic Tb(III) chelate as a probe known to produce intensive hot electron-induced electrochemiluminescence (HECL) with plain cathodic pulses and preoxidized electrodes. The presently studied system allows injection of hot electrons and holes successively into aqueous electrolyte solutions and can be utilized in detecting electrochemiluminescent labels in fully aqueous solutions, and actually, the system is suggested to be quite close to a pulse radiolysis system providing hydrated electrons and hydroxyl radicals as the primary radicals in aqueous solution without the problems and hazards of ionizing radiation. The analytical power of the present excitation waveforms are that they allow detection of electrochemiluminescent labels at very low detection limits in bioaffinity assays such as in immunoassays or DNA probe assays. The two important properties of the present waveforms are: (i) they provide in situ oxidation of the electrode surface resulting in the desired oxide film thickness and (ii) they can provide one-electron oxidants for the system by hole injection either via F- and F+-center band of the oxide or by direct hole injection to valence band of water at highly anodic pulse amplitudes. |
| Databáze: | OpenAIRE |
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