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The improved electrochemiluminescence behavior of glassy carbon electrode via in situ chemical bonding modification
摘要： An in situ chemical bonding method is developed for the electrochemiluminescence (ECL) modification of the oxidized glassy carbon electrode (GCEox). Bare GCE has been activated here via a fierce oxidizing etching to form GCEox. GCEox with numerous cracks and oxygen containing groups exhibits a negatively charged surface, which is tending to attract and react with the specific molecules to form chemical bonds. An ECL molecule Ru-L1 was synthesized and in situ bonded on GCEox surface to fabricate Ru-GCEox. The proposed chemical bonding modification eliminates the interface resistance to improve the electron transfer rate between Ru-L1 and the surface of GCE, which has been demonstrated by the better reversibility of Ru-GCEox than the traditional modified GCEs. The improvement of the ECL behavior of Ru-GCEox is also confirmed by its lower ECL potential than the traditional modified GCEs. Ru-GCEox is reusable to response α-naphthol with an ultrahigh sensitivity for its excellent ECL stability and scraping resistance, which decreases the consumption of Ru-L1. The successful fabrication of Ru-GCEox indicates the method of in situ chemical modification for GCEox can be applied to fabricate various glassy carbon-based sensors via coupling with various specific molecules.
关键词： ruthenium (II) complex,glassy carbon,the interfacial charge transfer,electrochemiluminescence
更新于2025-09-19 17:15:36
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Mechanism of the Ru(bpy)32+ single-bubble sonochemiluminescence in neutral and alkaline aqueous solutions
摘要： The paper addresses sonochemiluminescence generated by a single bubble levitating in neutral and alkaline aqueous solutions of Ru(bpy)3Cl2. Generally, this sonochemiluminescence was found to obey the rules identified previously for multi-bubble sonochemiluminescence and to be described by reactions between the Ru(bpy)3·2+ ion and the radical products Н·, ОН·, and eaq in solution. These products arise in the bubble upon decay of low-temperature plasma and migrate to the solution as the bubble intensively moves and its spherical shape is distorted as a result of a change in the acoustic pressure above and below the stability threshold. Some radicals can also get into the solution from a stationary bubble. The difference from the multibubble sonochemiluminescence is that luminescence intensity has a higher contribution of the re-emission effect of bubble luminescence by Ru(bpy)32+ ions. In solutions with low concentrations of the complex (10–6-10–5 М) and the bubble being stationary, this effect provides up to 2/3 of the total ruthenium emission intensity. It is suggested that the hydrated electrons, which increase the yield of sonochemiluminescence, can be generated upon single-bubble sonolysis of neutral solutions rather than only upon conversion of H atoms in alkaline solutions, as is the case for the multi-bubble sonochemiluminescence.
关键词： tris-bipyridyl ruthenium(II) complex,chemiluminescence,single-bubble sonoluminescence
更新于2025-09-04 15:30:14