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Bajjou, O., Bakour, A., Khenfouch, M., Baitoul, M., Mothudi, B., Maaza, M. & Faulques, E. (2018) Charge Carrier Dynamics and pH Effect on Optical Properties of Anionic and Cationic Porphyrin-Graphene Oxide Composites. Journal of Electronic Materials, 47 2897–2904. 
Added by: Richard Baschera (2018-04-27 13:27:59)   Last edited by: Richard Baschera (2018-04-27 13:34:07)
Type de référence: Article
DOI: 10.1007/s11664-018-6139-3
Clé BibTeX: Bajjou2018
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Catégories: INTERNATIONAL, MIOPS
Créateurs: Baitoul, Bajjou, Bakour, Faulques, Khenfouch, Maaza, Mothudi
Collection: Journal of Electronic Materials
Consultations : 10/620
Indice de consultation : 5%
Indice de popularité : 1.25%
Résumé     
Composites of graphene oxide (GO) functionalized with Sn(V) tetrakis (4-pyridyl)porphyrin (SnTPyP2+) and meso-tetrakis(4-phenylsulfonic acid)-porphyrin (H4TPPS42-) were prepared at different pH values. Successful synthesis of water-soluble stable suspension of GO-SnTPyP2+ and GO-H4TPPS42- 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-H4TPPS42- 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.
  
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