Facile Method for the Investigation of Temperature-Dependent C60 Diffusion in Conjugated Polymers
| Autor: | Christina Saller, Heinz Bässler, Frank-Julian Kahle, Steffen Tscheuschner, Denys Priadko, Peter Strohriegl, Tobias Hahn, Thomas Müller, Anna Köhler |
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| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Materials science Carbazole Bilayer 02 engineering and technology Activation energy Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Diffusion process Chemical physics General Materials Science Diffusion (business) 0210 nano-technology Glass transition Layer (electronics) |
| Zdroj: | ACS Applied Materials & Interfaces. 10:21499-21509 |
| ISSN: | 1944-8252 1944-8244 |
| Popis: | We developed a novel all-optical method for monitoring the diffusion of a small quencher molecule through a polymer layer in a bilayer architecture. Experimentally, we injected C60 molecules from a C60 layer into the adjacent donor layer by stepwise heating, and we measured how the photoluminescence (PL) of the donor layer becomes gradually quenched by the incoming C60 molecules. By analyzing the temporal evolution of the PL, the diffusion coefficient of C60 can be extracted, as well as its activation energy and an approximate concentration profile in the film. We applied this technique to three carbazole-based low-bandgap polymers with different glass temperatures with a view to study the impact of structural changes of the polymer matrix on the diffusion process. We find that C60 diffusion is thermally activated and not driven by WFL-type collective motion above Tg but rather by local motions mediated by the sidechains. The results are useful as guidance for material design and device engineering, and t... |
| Databáze: | OpenAIRE |
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