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Electrochemiluminescent sensor based on Ru(bpy)32+-doped silica nanoprobe by incorporating a new co-reactant NBD-amine for selective detection of hydrogen sulfide
摘要： Here, we fabricated a new amine compound as the co-reactant and incorporated an ECL sensor based on RuSi NPs/Nafion to improve the detection sensitivity of ECL system toward H2S by enhancing ECL intensity. The prepared sensor shows a good detection effect. In the work, water-oil microemulsion method was used to synthesize the Ru(bpy)3 2+-doped silica nanoparticles (RuSi NPs), and then mixed the RuSi NPs solution with Nafion (5 wt%) followed by modifying the mixture to the electrode. Upon treatment with H2S, the co-reactant NBD (7-nitro-1,2,3-benzoxadiazole) can release the piperazine intermediate, which can effectively improve the ECL signals of Ru(bpy)3 2+. This enhanced ECL assay for H2S detection have the following several merits: excellent sensitivity with the detection limit of 1.7 × 10 -12mol/L, good selectivity over interfering species.
关键词： Co-reactant,ECL,NBD-amine,Hydrogen sulfide,Ru(bpy)3
更新于2025-09-23 15:23:52
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Impact of aminated carbon quantum dots as a novel co-reactant for Ru(bpy)32+: resolving specific electrochemiluminescence for butein detection
摘要： Development of novel nanomaterial-based co-reactant is highly desired for enhancing ECL intensity and widespread analytical applications. Herein, we report the distinct role of amine-functionalized carbon quantum dots (f-CQDs) as a co-reactant, for the first time, augmenting the ECL property of Ru(bpy)3 2+ and demonstrating for biopharmaceutical (butein) detection. Unlike conventional co-reactants like tripropylamine (TPrA), 2-(dibutylamino)ethanol (DBAE), and pristine CQDs, the f-CQDs as a co-reactant yield superior ECL of Ru(bpy)3 2+. More importantly, the ECL intensity is independent of types of noble metals, metal oxide surfaces, and dissolved oxygen. Notably, the ECL intensity of Ru(bpy)3 2+–f-CQDs is linearly quenched with an increased concentration of butein, whereas no changes were observed with conventional co-reactants. ECL functionality of Ru(bpy)3 2+–f-CQDs has no interference with other similar phytochemicals and antioxidants. Enhanced selectivity is observed due to the formation of polyaminoquinone-like structures, which is confirmed by in situ spectroelectrochemical (UV–vis) and FT-IR studies. The present result envisaged that f-CQDs could be an alternative co-reactant for TPrA/DBAE, raising the ECL of Ru(bpy)3 2+ suitable for analytical studies.
关键词： Polyphenol,Functionalized carbon quantum dots (f-CQDs),Co-reactant,Electrochemiluminescence,Butein
更新于2025-09-12 10:27:22
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Electrochemiluminescence of gold nanoparticles and gold nanoparticle-labelled antibodies as co-reactants
摘要： Gold nanoparticles (AuNPs) and AuNP-labelled antibodies can participate in the electrochemiluminescence (ECL) reaction of tris(2,20-bipyridyl) ruthenium(II) (Ru(bpy)3 2+) as a co-reactant. The electrochemical and spectral characteristics of this new ECL system were con?rmed by experiments, and its reaction mechanism was speculated to be di?erent from that of typical ECL. The experimental results showed that the new ECL system exhibited higher ECL e?ciency, and AuNP-labelled substances can be sensitively measured with the help of AuNPs. Based on the dual role of AuNPs as a co-reactant and marker, the AuNP–Ru(bpy)3 2+ ECL system will be a useful tool in biochemical analysis.
关键词： co-reactant,Ru(bpy)3 2+,Electrochemiluminescence,biochemical analysis,gold nanoparticles
更新于2025-09-11 14:15:04
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Langmuir–Hinshelwood and Light-Intensity Dependence Analyses of Photocatalytic Oxidation Rates by Two-Dimensional-Ladder Kinetic Simulation
摘要： Though photocatalytic reactions gather enormous attention, dependences of light intensity and reactant concentration have not been concurrently expressed clearly. In the previously reported studies, a quadratic formula equation obtained from the conventional analysis using the concentration of electron?hole pairs has been modified. In this report we numerically simulated the reaction with a two-dimensional(2D)-ladder kinetics without using electron?hole concentrations. In fundamental processes, (i) photoabsorption, (ii) reduction, (iii) oxidation, and (iv) recombination, were treated as the transitions between the states of each powder characterized by the numbers of possessing negative and positive charges. Through the numerical 2D-ladder simulation with various rate constants, the light-intensity (I) dependence of the oxidation rate was found to be fully expressed by involving the square of the intrinsic quantum yield into the square root part of the well-known quadratic formula equation. The square root dependence of the reaction rate, r ∝ I1/2, could be expected only when the rate of the reduction is extremely smaller than the recombination rate at the normal light intensity. Then, the resultant equations obtained with this 2D-ladder simulation were transformed to the equation for Langmuir?Hinshelwood kinetics with two parameters, rL and KL, which correspond to the intrinsic oxidation rate and the adsorption equilibrium constant of the reactant, respectively. Light-intensity dependence of KL was expressed by adding two terms proportional to I2 to both the adsorption and desorption rate constants. The reported experimental data sets of the decomposition rates for phenol and 4-chlorophenol were fitted with the proposed equation, and then from the obtained parameter values the formation rate of (cid:129)O2? could be estimated and found to be compatible to that which has been experimentally measured. Thus, the present analytical treatment is actually the simple and useful method to understand the dependencies of reactant concentration and light-intensity on the photocatalytic oxidation rates.
关键词： reactant concentration,photocatalytic reactions,light intensity,Langmuir?Hinshelwood kinetics,two-dimensional-ladder kinetics
更新于2025-09-04 15:30:14