Martinez, Natalia P. and Inostroza-Rivera, Ricardo and Duran, Boris and Molero, Leonard and Bonardd, Sebastian and Ramirez, Oscar and Isaacs, Mauricio and Diaz Diaz, David and Leiva, Angel and Saldias, Cesar (2019) Exploring the Effect of the Irradiation Time on Photosensitized Dendrimer-Based Nanoaggregates for Potential Applications in Light-Driven Water Photoreduction. NANOMATERIALS, 9 (9): 1316. ISSN , 2079-4991
Full text not available from this repository. (Request a copy)Abstract
Fourth generation polyamidoamine dendrimer (PAMAM, G4) modified with fluorescein units (F) at the periphery and Pt nanoparticles stabilized by L-ascorbate were prepared. These dendrimers modified with hydrophobic fluorescein were used to achieve self-assembling structures, giving rise to the formation of nanoaggregates in water. The photoactive fluorescein units were mainly used as photosensitizer units in the process of the catalytic photoreduction of water propitiated by light. Complementarily, Pt-ascorbate nanoparticles acted as the active sites to generate H-2. Importantly, the study of the functional, optical, surface potential and morphological properties of the photosensitized dendrimer aggregates at different irradiation times allowed for insights to be gained into the behavior of these systems. Thus, the resultant photosensitized PAMAM-fluorescein (G4-F) nanoaggregates (NG) were conveniently applied to light-driven water photoreduction along with sodium L-ascorbate and methyl viologen as the sacrificial reagent and electron relay agent, respectively. Notably, these aggregates exhibited appropriate stability and catalytic activity over time for hydrogen production. Additionally, in order to propose a potential use of these types of systems, the in situ generated H-2 was able to reduce a certain amount of methylene blue (MB). Finally, theoretical electronic analyses provided insights into the possible excited states of the fluorescein molecules that could intervene in the global mechanism of H-2 generation.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | PAMAM DENDRIMER; METHYLENE-BLUE; ENERGY-SYSTEMS; NANOPARTICLES; HYDROGEN; PHOTOSYNTHESIS; DELIVERY; DYES; REDUCTION; HYBRID; dendrimers; photoactive; hydrogen evolution; artificial photosynthesis |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Organische Chemie > Arbeitskreis Prof. Dr. David Díaz Díaz |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 06 Apr 2020 10:00 |
| Last Modified: | 06 Apr 2020 10:00 |
| URI: | https://pred.uni-regensburg.de/id/eprint/26296 |
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