Fabrication of CdS/Ru(bpy)<sub>3</sub><sup>2+</sup>electrochemiluminescence sensor for detection of catechol
A self-reinforced CdS/Ru(bpy)<sub>3</sub><sup>2+</sup> electrochemiluminescence (ECL) sensor was constructed based on the sensitization of cadmium sulfide quantum dots (CdS QDs) to the ECL signal of tris(2,2'-bipyridyl)ruthenium(Ⅱ) (Ru(bpy)<sub>3</sub><sup...
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| Autores principales: | , , |
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| Formato: | article |
| Lenguaje: | EN ZH |
| Publicado: |
Academic Journals Center of Shanghai Normal University
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/33787eb8143f47dfa2400cb0ac0737c5 |
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| Sumario: | A self-reinforced CdS/Ru(bpy)<sub>3</sub><sup>2+</sup> electrochemiluminescence (ECL) sensor was constructed based on the sensitization of cadmium sulfide quantum dots (CdS QDs) to the ECL signal of tris(2,2'-bipyridyl)ruthenium(Ⅱ) (Ru(bpy)<sub>3</sub><sup>2+</sup>). CdS QDs were firstcoated dropwise on the electrode surface, and then a tris(2,2'-bipyridyl)ruthenium(Ⅱ) complex with multi-walled carbon nanotubes and gold nanoparticles (MWCNTs-Au NPs-Ru(bpy)<sub>3</sub><sup>2+</sup>)was introduced. The sensor has the characteristics of self enhancement since it contains both ECL material Ru(bpy)<sub>3</sub><sup>2+</sup> and coreactant CDs QDs. The presence of MWCNTs and Au NPs can further amplify the sensor signal. The energy transfer between the electrode oxidation products of catechol and Ru (bpy)<sub>3</sub><sup>2+</sup> led to the quenching of the ECL signal, realizing the sensitive detection of catechol with a linear response range from 5.0×10<sup>-9</sup> to 1.0×10<sup>-5 </sup>mol·L<sup>-1</sup> and a detection limit of 1.5×10<sup>-9</sup> mol·L<sup>-1</sup>. The sensor showed good reproducibility and stability and was used to detect catechol in river water with satisfactory result. |
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