Probing the Nanoscale Phase Separation and Photophysics Properties of Low-Bandgap Polymer:Fullerene Blend Film by Near-Field Spectroscopic Mapping
| Autor: | Mauro Morana, Alfred J. Meixner, Hans-Georg Mack, Hamed Azimi, Hans-Joachim Egelhaaf, Dai Zhang, Xiao Wang |
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| Rok vydání: | 2011 |
| Předmět: |
Optics and Photonics
Photoluminescence Fullerene Materials science Light Polymers Band gap Analytical chemistry Spectrum Analysis Raman Phase Transition Biomaterials Micrometre Phase (matter) Thiadiazoles General Materials Science Sulfhydryl Compounds Nanoscopic scale chemistry.chemical_classification Microscopy Confocal Spectrum Analysis General Chemistry Polymer chemistry Nanoparticles Fullerenes Polymer blend Biotechnology |
| Zdroj: | Small. 7:2793-2800 |
| ISSN: | 1613-6810 |
| DOI: | 10.1002/smll.201101000 |
| Popis: | The effect of the additive 1,8-octanedithiol (ODT) on the nanometer-scale morphology and local photophysical properties of low-bandgap polymer blends of poly[2,6-(4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b'] dithiophene)- alt-4,7(2,1,3-benzothiadiazole)] (PCPDTBT) and [6,6]-phenyl C(61) -butyric acid methyl ester (PCBM) is investigated. Phase separations of the PCPDTBT:PCBM blend film induced by ODT are visualized by the morphological changes from fibril-shaped features to spherical bumps, by the dramatically increased photoluminescence emission from PCPDTBT that was originally largely quenched, and by the fluctuations of spectral features at different locations of the sample surface. The correlations between the morphology and the local photophysical properties of the blend film with/without ODT at both the micrometer and nanometer scales are revealed by confocal and high-resolution near-field spectroscopic mapping techniques. |
| Databáze: | OpenAIRE |
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