Spectroscopic investigations on hybrid nanocomposites: CdS:Mn nanocrystals in a conjugated polymer
| Autor: | A. Haj Said, André Pierre Legrand, Joel Davenas, J.-J. André, Mohamed Haouari, H. Ben Ouada, Moss Bernard, F. Mattoussi, Cherif Dridi |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Materials science
Nanocomposite Band gap Relaxation (NMR) Analytical chemistry Physics::Optics Nanoparticle Bioengineering Polaron law.invention Biomaterials Condensed Matter::Materials Science Mechanics of Materials Phenylene Quantum dot law Condensed Matter::Strongly Correlated Electrons Electron paramagnetic resonance |
| Zdroj: | Materials Science and Engineering: C. 26:415-420 |
| ISSN: | 0928-4931 |
| DOI: | 10.1016/j.msec.2005.10.036 |
| Popis: | We have used electron paramagnetic resonance (EPR) spectroscopy for investigating the properties of spins, such as those carried by polarons which carry both spin and charge in poly (meta/para phenylene) PMPP: CdS doped Mn based nanocomposites. To identify the nature of paramagnetic species in PMPP matrix, we have studied the effect of different physical parameters. It was found that we are in presence of trapped polarons and localized spins which concentration has been estimated. Moreover, spin–spin and spin–lattice relaxation rates have been calculated. Then, we discussed the results of optical and EPR study on the hybrid nanocomposite (CdS nanostructures, doped with manganese (II) ions, incorporated in PMPP conjugated polymer matrix). The optical spectra of these nanocomposites were compared to the existing models of energy levels in quantum dots. Moreover, by the use of electronic paramagnetic resonance, conclusions about the location and the symmetry of Mn 2+ ions have been drawn. The nanocomposite energy gap is in the 3.2–3.3 eV range. The size of the nanoparticle is about 3.3 nm and Mn 2+ ions are located at or near the nanoparticle surface. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect