Modification with mesoporous platinum and poly(pyrrole-3-carboxylic acid)-based copolymer on boron-doped diamond for nonenzymatic sensing of hydrogen peroxide
| Autor: | John H. T. Luong, Wen-Wen Wu, Hui-Fang Cui, Xiaoyun He, Yan-Feng Bai |
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| Rok vydání: | 2016 |
| Předmět: |
General Chemical Engineering
Inorganic chemistry Diamond Nanoparticle chemistry.chemical_element 02 engineering and technology engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Polypyrrole Electrochemistry 01 natural sciences 0104 chemical sciences Analytical Chemistry Nanoclusters chemistry.chemical_compound chemistry Electrode engineering 0210 nano-technology Mesoporous material Platinum |
| Zdroj: | Journal of Electroanalytical Chemistry. 766:52-59 |
| ISSN: | 1572-6657 |
| Popis: | A sensitive, accurate, free of oxygen interference electrochemical sensing approach was developed in this study for H2O2 level, an important parameter in clinical, biological and environmental fields. A boron-doped diamond (BDD) electrode was modified with mesoporous platinum (MPrPt) by electrodeposition of Pt–Cu alloy and anodic dissolution of Cu from the alloy, followed by the electropolymerization of a poly(pyrrole-3-carboxylic acid) (PPy3C) and polypyrrole (PPy) (PPy3C: PPy = 4:1, molar ratio) copolymer. SEM micrographs revealed that MPrPt irregularly spreads on the BDD surface as ~ 100 nm mesoporous and snow-flake-like nanoclusters, with a pore size of 10 ~ 15 nm, and a trace amount of remnant Cu. The resulting Pt roughness factor and the effective surface area of the MPrPt/BDD were significantly larger, and its charge-transfer resistance was much smaller than those of the Pt nanoparticle modified BDD electrode. The PPy3C–PPy/MPrPt/BDD electrode exhibited very much sensitive, selective, precise, accurate, stable, reproducible, and a wide linear range of H2O2 responses at neutral pH under ambient condition, with similar sensitivity and S/N ratio to those under nitrogen protection. The limit of detection (LOD) for H2O2 was 2 μM, with linearity range of 5 μM ~ 49 mM (4 orders of magnitude). The BDD substrate, MPrPt, and the PPy3C–PPy copolymer together exerted a synergic effect to the prominent sensing performance. The detection was free from endogenous oxygen interference, one of the most critical issues in microanalysis, in vivo monitoring and field applications. |
| Databáze: | OpenAIRE |
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