Charge Carrier Dynamics and pH Effect on Optical Properties of Anionic and Cationic Porphyrin–Graphene Oxide Composites
| Autor: | Malik Maaza, Mohammed Khenfouch, Eric Faulques, Omar Bajjou, Mimouna Baitoul, Anass Bakour, Bakang Moses Mothudi |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Photoluminescence Oxide 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention symbols.namesake chemistry.chemical_compound law Materials Chemistry Electrical and Electronic Engineering Composite material Absorption (electromagnetic radiation) Graphene Cationic polymerization 021001 nanoscience & nanotechnology Condensed Matter Physics Porphyrin 0104 chemical sciences Electronic Optical and Magnetic Materials chemistry symbols Charge carrier 0210 nano-technology Raman spectroscopy |
| Zdroj: | Journal of Electronic Materials. 47:2897-2904 |
| ISSN: | 1543-186X 0361-5235 |
| DOI: | 10.1007/s11664-018-6139-3 |
| Popis: | Composites of graphene oxide (GO) functionalized with Sn(V) tetrakis (4-pyridyl)porphyrin (SnTPyP2+) and meso-tetrakis(4-phenylsulfonic acid)porphyrin (H4TPPS 4 2− ) were prepared at different pH values.Successful synthesis of water-soluble stable suspension of GO–SnTPyP2+ and GO–H4TPPS 4 2− was confirmed using various spectroscopic techniques, including scanning electronic microscopy (SEM), Raman spectroscopy, and ultraviolet–visible (UV–Vis) absorption. Variation of the pH was found to strongly influence the optical properties of the GO–SnTPyP2+ and GO–H4TPPS 4 2− composites, as demonstrated by the UV–Vis absorption results. Steady-state photoluminescence (PL) and time-resolved PL (TRPL) results for both composites showed PL quenching and decrease in the exciton mean lifetime, suggesting strong excited-state interactions between the different components. Moreover, charge carrier dynamics study revealed that insertion of GO into both porphyrin derivatives led to faster mean lifetime for excitons with a slight advantage in the case of the cationic porphyrin–GO composite, making it a better choice for charge separation applications thanks to the higher efficiency of charge/energy transfer interactions. |
| Databáze: | OpenAIRE |
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