Excitation quenching in polyfluorene polymers bound to (6,5) single-wall carbon nanotubes
| Autor: | Ramūnas Augulis, Vidmantas Gulbinas, Angela Eckstein, Kipras Redeckas, Tobias Hertel, Imge Namal, Mikas Vengris, Renata Karpicz |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
chemistry.chemical_classification
Quenching (fluorescence) Analytical chemistry General Physics and Astronomy 02 engineering and technology Carbon nanotube Polymer 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Fluorescence humanities 0104 chemical sciences law.invention Polyfluorene chemistry.chemical_compound chemistry law Excited state Ultrafast laser spectroscopy Physical and Theoretical Chemistry 0210 nano-technology Spectroscopy |
| Zdroj: | Chemical Physics. 467:1-5 |
| ISSN: | 0301-0104 |
| Popis: | Fluorescence quenching of polyfluorene-based polymer (PFO-BPy) attached to single-wall carbon nanotubes (SWNT) has been investigated by means of fluorescence and transient absorption spectroscopy. Fluorescence of SWNT/PFO-BPy complex suspension in chlorobenzene decays nonexponentialy on a time scale from several to several hundreds of picoseconds, and experiences slower depolarization if compared with free polymer in solution. We attribute the slowly quenched and more polarized fluorescence to the polymer tail segments that are not in direct contact with the SWNT. Polymer fluorescence in SWNT/PFO-BPy solid films is quenched about 10 times faster than in suspensions. The initial excited state quenching in films occurs with a 2.3 ps time constant, which we attribute to the polymer chains intimately attached to the SWNT. Slow changes of the spectroscopic properties of the SWNT/PFO-BPy suspensions with time revealed that their aging is associated with the desorption of polymers from SWNT, increasing their tendency to aggregate. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect