E-Locus - Institutional Repository of the University of Crete

Home Collections Type of Work Post-graduate theses

Post-graduate theses

Search command : Author="Πλατής" And Author="Ιωάννης"

Current Record: 4925 of 6573

[Add to Basket]

Identifier

000348326

Title

Νέα υβριδικά υλικά με κατάλληλα υποκατεστημένους πορφυρινικούς δακτυλίους για εφαρμογές σε εναλλακτικές πηγές ενέργειας

Alternative Title

Comparative phylogenetic diversity of sediment bacteria from the deep Pacific ocean and the eastern Mediterranean sea (KM3 Station)

Author

Σκόνδρα Αγγελική Λ.

Thesis advisor

Κουτσολέλος, Αθανάσιος Γ

Abstract

The outstanding properties of single–walled carbon nanotubes (SWNTs) have aroused tremendous interest to implement this novel carbon allotrope into practical applications such as optoelectronics and photovoltaics. The ability of the SWNTs to accept electrons and the ability of the electrons to readily diffuse with negligible energy loss have inspired the synthesis of donor–acceptor nanosystems utilizing SWNTs and covalently attached ferrocene, pyrene and porphyrins. Functionalizing SWNTs with chromophores is expected to lead to the development of novel nanoconjugate systems that bear great promise in converting solar energy into electricity. In the present study novel porphyrin derivatives which are covalently attached with pyrene or ferrocene have been prepared. The identification of all organic compounds was achieved by NMR spectroscopy (1H, 13C, COSY, HMBC and HMQC) and mass spectroscopy. SWNTs were initially functionalized, followed the established methodology of in-situ generated aryl diazonium salts, in order to (i) solubilize them and (ii) introduce free amino-functions where in the following steps the covalently attachment of the porphyrins would be accomplished. The novel hybrid materials were fully characterized by UV–Vis, FT–IR, Raman, fluorescence spectroscopies and TGA as well as HR-TEM. Preliminary UV-vis and fluorescence experiments showed an electronic communication between the porphyrin moieties and nanotubes, making these materials promising for photovoltaic applications.

Language

Greek

Subject

carbon nanotubes

charge transfer

hybrid materials

intramolecular communication

photovoltaics

porphyrin

ενδοϋβριδική επικοινωνία

μεταφορά φορτίου

νανοσωλήνες άνθρακα