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| Title
| - Template Synthesis of Highly Oriented Polyfluorene Nanotube Arrays
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| Abstract
| - Polyfluorene nanotubes are synthesized by solution assisted wetting of porous alumina membranes. X-ray diffraction data indicate polymer chain alignment along the nanotube long axes. Raman spectroscopic data indicate polymer intra-chain re-orientation from the random conformation to the planarized β-phase. Polarization resolved photoluminescence data confirm the axial alignment of the β-phase chains.
- Polyfluorene nanotubes are synthesized by solution assisted wetting of porous anodic alumina membranes. Well aligned arrays of close packed (∼109 tubes/cm−2) discrete nanotubes are obtained. Individual tubes have diameters of ∼260 nm and wall thicknesses of ∼50 nm. X-ray diffraction measurements carried out on nanotube arrays embedded in host templates indicate a polymer chain alignment along the long axes of the template pores and, as a result, along the long axes of the nanotubes themselves. Optical spectroscopic studies of mats of nanotubes on glass substrates yield well resolved emission spectra reflecting a narrowed distribution of emitting chain segments with increased effective conjugation lengths. The data indicate intrachain reorientation of the amorphous random poly(9,9-dioctylfluorene-2,7-diyl) molecular conformation to the more planar (low energy) extended 21 helical β-phase conformation within the tubes. Raman spectra acquired for template embedded tubes are also consistent with β-phase formation. Finally, polarization resolved photoluminescence data demonstrate a pronounced axial orientation of the emissive β-phase chains within the tubes.
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| - Highly Oriented Polyfluorene Nanotube Arrays
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